Sample projects

Complete redacted permit sets, grouped by the kind of work — general commercial electrical design, utility-scale and commercial PV, and residential. Client names and exact site addresses are removed; the electrical design work underneath is untouched. Click a project to open its drawings and an exact-location satellite view.

Electrical site plan sheet from the McClymonds High School modernization set
GENERAL CONSTRUCTION

High School Modernization — Electrical

Oakland, California
103 SHEETS ACROSS TWO INCREMENTS · 4000A SERVICE CHANGEOVER TO 480Y/277V · SPORTS FIELD LIGHTING · DSA
 Electrical sheet from the Deer Creek Behavioral Health Center construction set
GENERAL CONSTRUCTION

Behavioral Health Center — Full Building Electrical

Nevada City, California
600A 208Y/120V SERVICE · 150 KW STANDBY GENERATOR · 82 KWDC ROOFTOP PV
 Architect's aerial render of the Tenaya Middle School sports fields and running track
GENERAL CONSTRUCTION

Middle School Sports Field & Site Lighting

Merced, California
MUSCO SPORTS LIGHTING · LED AREA & PATHWAY · CAMERA POLES · UL924 BYPASS
RESIDENTIAL

Whole-House Electrical — 400A Service, PV and Battery

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A full electrical design for a 3,428 sq ft three-storey Berkeley home: a new 400A service, distribution across four levels, a rooftop photovoltaic array with battery storage and whole-home backup, and an EV charger. The architect's site plan, elevations, section and MEP plans open the set, so the electrical sheets can be read against the building they serve. Practice and engineer-of-record identification is removed throughout; the design work is untouched. Issued as a preliminary set.

SERVICE
New 400A, 120/240V, 1PH 3W service, 22 kAIC · combination meter and CT cabinet in a NEMA 3R enclosure, to PG&E Greenbook metering requirements · 750 MCM AL service conductors with 4/0 AWG AL neutral · distribution panel A for the 2nd and 3rd floors and panel B for the basement and 1st floor, 200A each · 200A backup panel
SYSTEMS
26 Solaria PowerXT 400-RM modules, 10.4 kWDC, on SolarEdge P400 optimizers · SolarEdge Home Wave SE7600H-US inverter, 7.6 kW · (2) Tesla Powerwall 2 AC battery systems, 27 kWh total · Tesla Backup Gateway 2, 200A · 14 kVA EV charger · two heat pumps, air handler, radiant heating mat and heat strips
CODES
California Electrical Code · Title 24 Part 6 · NEC 220 dwelling-unit feeder calculation, 84.4 kVA demand · PG&E Greenbook service and metering requirements
SHEETS
19 sheets — the architect's site plan, three elevations, longitudinal section and MEP plans · then the electrical set: legends, sheet index and lighting fixture schedule · single line with service load calculation and panel schedules · power and lighting plans across four levels · site plan with the PV array layout and the PG&E meter, sub-panel and EV charger locations
Architect's proposed site plan, sheet 1 of 19
CLICK TO ENLARGE
Project site, shown at its exact location.
GENERAL CONSTRUCTION

High School Modernization — Electrical, Two Increments

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A DSA-reviewed electrical package for a whole-campus high school modernization, issued in two increments. Increment 1 is the building work — a utility service changeover from 208Y/120V to 480Y/277V, new distribution throughout, branch power, lighting and controls, emergency egress and low-voltage infrastructure. Increment 2 is the sports field package that followed. Both increments are shown here as separate sheet sets.

SERVICE
New 480Y/277V, 4000A utility service, coordinated with PG&E · existing 208Y/120V, 4000A utility service equipment demolished · new 480Y/277V distribution and step-down transformers across the site, 25–1000 kVA · new 400A 480Y/277V sports-field distribution panel with 75 kVA transformer
SCOPE
Service changeover — PG&E coordination, new 480Y/277V 4000A service equipment, demolition of the existing 208Y/120V service · every 208Y/120V distribution panel replaced, with loads separated onto the new panels · 480Y/277V distribution and step-down transformers campus-wide · feeders and branch power, lighting and lighting controls, emergency and egress lighting with inverter, fire alarm and low-voltage rough-in, site power, EV charging provisions · Increment 2: Musco sports lighting with control link, pole circuits, bleacher power, 4.2 kVA outdoor video display, 12.5 kVA emergency inverter
CODES
2022 California Building, Electrical, Mechanical, Plumbing, Energy, Fire and Green Building Standards Codes (Title 24) · 2020 NEC · NFPA 13 / 14 / 72 / 110 · DSA review
SHEETS
103 sheets — 93 in Increment 1, 10 in Increment 2
Drawing sheet 1 of 93
CLICK TO ENLARGE
Drawing sheet 1 of 10
CLICK TO ENLARGE
Overall electrical site plan for the campus
CLICK TO ENLARGE
Project site, shown at its exact location.
GENERAL CONSTRUCTION

Behavioral Health Center — Full Building Electrical

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A complete electrical construction set for a new county behavioral health facility: utility service and metering, distribution, lighting and controls, standby power, and a roof-mounted photovoltaic system interconnected at the service. Kitchen equipment is interlocked to the hood suppression system through a shunt-trip main.

SERVICE
600A 208Y/120V, 3PH 4W, 22–25 kAIC · PG&E service and metering · distribution panelboards 100–400A
SYSTEMS
150 kW diesel standby generator · roof-mounted PV, 82.11 kWDC / 66.6 kWAC with 50 kW inverter system · emergency and egress lighting per CEC 700.12 · Ansul shunt-trip interlock on the kitchen panel · fire alarm and low voltage
CODES
California Electrical Code · NEC 690 and 705 for the PV interconnection · CEC 700 emergency systems · UL 2200 listed generator
SHEETS
37 sheets — notes and symbols, single lines, power and lighting plans, feeder schedules, panel schedules, PV, site electrical, details
Drawing sheet 1 of 37
CLICK TO ENLARGE
Render of the building with rooftop PV and generator enclosure
CLICK TO ENLARGE
Project site, shown at its exact location.
GENERAL CONSTRUCTION

Middle School Sports Field & Site Lighting

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A DSA-reviewed electrical set for a middle school sports field and site improvement: Musco field lighting, LED area and pathway lighting, security camera poles and the controls behind them, fed from a new breaker in the existing main switchboard.

SERVICE
Existing 2000A 480Y/277V, 3PH 4W main switchboard, 65 kAIC · new 225A/3P feeder · 10 kVA 480V–120/240V transformer · utility: Merced Irrigation District
SYSTEMS
Musco sports field lighting and poles · Lithonia D-Series LED area lighting, IES Type 3, 277V on 20 ft poles with 0–10V dimming · security camera poles · lighting control panel with dimming relays in NEMA 3R · UL924 bypass relay for emergency override · weather-proof GFI receptacle pedestals · emergency inverter
CODES
California Electrical Code · Title 24 Part 6 outdoor lighting controls · UL924 · DSA review
SHEETS
11 sheets — symbols and schedules, single line, site electrical and lighting plans, details
Drawing sheet 1 of 11
CLICK TO ENLARGE
Architect's aerial render of the completed sports fields, running track and lighting poles
Architect's render of the completed site.
Project site, shown at its exact location.
RESIDENTIAL

Residential Rooftop Solar + Battery — Full Project Sample

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A complete redacted permit set for a single-family rooftop PV system with DC-coupled battery storage and a dedicated backup panel, plus the site context a plan reviewer sees first. Homeowner name and exact site address removed; the electrical design work is untouched.

SYSTEM
10.2 kWSTC / 7.6 kWAC · 30 Hanwha Qcells Q.PEAK DUO BLK-G6+ 340W modules · (1) SolarEdge SE7600H-US inverter with (30) P370 optimizers · (1) LG Chem RESU10H Prime battery (5 kW / 9.6 kWh) · SolarEdge B1-NUSGN-01 Backup Interface (grid / inverter / generator lugs) & 100A backup panel · dedicated utility DER storage meter
CODES
NEC 690 · 2018 IBC / IFC / IRC · local AHJ
SHEETS
27 sheets — title, notes, site plan, structural, single-line, three-line, equipment layout, specs
Drawing sheet 1 of 27
CLICK TO ENLARGE
Project site, shown at its exact location.
RESIDENTIAL

Residential Barn-Roof Solar — Full Project Sample

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A complete redacted permit set for a rooftop PV system installed on a rural property's barn, plus a backup generator and ATS. Homeowner name and exact site address removed from the title block and cover sheet on every page; the contractor (Phoenix Energy Solutions, a separate solar installation company) contact information is also redacted as an outside party. The Electrical Engineer of Record (Natron Resources) design work is untouched.

SYSTEM
11.5 kWSTC / 9.423 kWAC · 27 Hanwha Q.PEAK DUO L-G8 425W modules · (27) Enphase IQ7A-72-2-US microinverters · barn-roof racking, plus 24kW Generac standby generator & ATS
CODES
2019 California Building Code / Electric Code / Fire Code
SHEETS
24 sheets — title sheet & general notes, site plan & detailed site plan, structural notes/layout/racking bracket details, single-line diagram, wiring calculation, equipment layout, electrical details, labels & markings, equipment specifications, structural specifications
Drawing sheet 1 of 24
CLICK TO ENLARGE
Project site, shown at its exact location.
RESIDENTIAL

Residential Standby Generator — Full Project Sample

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A complete redacted permit set for a whole-home standby generator and automatic transfer switch installation. Homeowner name and exact site address removed from the title block and cover sheet on every page — including the pin label on the vicinity-map inset; the contractor (Phoenix Energy Solutions, a separate installation company) contact information is also redacted as an outside party. The Electrical Engineer of Record (Natron Resources) design work is untouched.

SYSTEM
22 kW Generac standby generator (G007042-3, 240V, 1Ø) · Generac ATS RXEMW200A3 (120/240V) · new 200A Eaton subpanel · liquid propane fuel
CODES
2019 California Building Code / Electric Code / Fire Code
SHEETS
10 sheets — title sheet & general notes, site plan, single line diagram, equipment layout, electrical details, labels & markings, equipment specifications
Drawing sheet 1 of 10
CLICK TO ENLARGE
Project site, shown at its exact location.
RESIDENTIAL

Residential Rooftop Solar + Battery — Full Project Sample

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A complete redacted permit set for a single-family rooftop PV system paired with battery storage and a backup gateway. Homeowner name and exact site address removed from the title block and cover sheet on every page — including the pin label on the vicinity-map inset; the contractor (Hannah Solar, a separate installation company) contact information is also redacted as an outside party. The Electrical Engineer of Record (Natron Resources) design work is untouched.

SYSTEM
15.2 kWSTC / 10 kWAC · 40 Hanwha Qcells Q.PEAK DUO BLK ML-G9+ 380W modules · (1) SolarEdge SE10000H-US inverter · (2) Tesla Powerwall 2 & Tesla Backup Gateway
CODES
2018 International Building Code / 2017 National Electrical Code / 2018 International Fire Code
SHEETS
21 sheets — title sheet & electrical notes, site plan & detailed site plan, structural notes/layout/racking details, single-line diagram, wiring calculations, equipment layout, labels & markings, equipment specifications, structural specifications
Drawing sheet 1 of 21
CLICK TO ENLARGE
Project site, shown at its exact location.
RESIDENTIAL

Residential Rooftop Solar + Battery — Full Project Sample

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A complete redacted permit set for a single-family rooftop PV system paired with a battery energy storage system. Homeowner name and exact site address removed from the title block and cover sheet on every page — including the pin label on the vicinity-map inset — as well as a different neighboring property's address disclosed on a shared-service warning label; the contractor (Spreck Energy, a separate installation company) name, logo and contact information is also redacted as an outside party, wherever it repeats through the set. The Electrical Engineer of Record (Natron Resources) design work is untouched.

SYSTEM
12.8 kWSTC / 15.2 kWAC · 32 Solaria PowerXT-400R-PM 400W modules · (2) Generac X7602 240V inverters · (1) Generac PWRcell battery (9 kW / 18 kWh) — a single-manufacturer Generac PWRcell system
CODES
2019 California Building Code / Electric Code / Fire Code
SHEETS
17 sheets — title sheet & electrical notes, site plan & detailed site plan, structural notes & layout, single line diagram, wiring calculation, equipment layout, labels & markings, equipment specifications, structural specifications
Drawing sheet 1 of 17
CLICK TO ENLARGE
Project site, shown at its exact location.
RESIDENTIAL

Residential Rooftop Solar + Battery — Full Project Sample

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A complete redacted permit set for a single-family rooftop PV system paired with a battery energy storage system. Homeowner name and exact site address removed from the title block and cover sheet on every page — including the pin label on the vicinity-map inset; the contractor (Sun Warrior, a separate installation company) contact information is also redacted as an outside party. A structural sub-consultant's seal on the structural sheets is redacted under the same policy as the Electrical Engineer of Record's own stamp; the Natron Resources design work itself is untouched.

SYSTEM
10.9 kWSTC / 12 kWAC · 32 Hanwha Qcells Q.PEAK DUO BLK-G6+ 340W modules · (1) Sol-Ark Sol-Ark-12K-P hybrid inverter · (1) FNS Power lithium-ion battery bank (14.4 kWh, 48V) · Honeywell service-rated automatic transfer switch — whole-home backup
CODES
2018 International Residential Code · 2008 National Electric Code
SHEETS
20 sheets — title sheet & electrical notes, site plan & detailed site plan, structural notes & layout, single line & three line diagrams, wiring calculation, equipment layout, labels & markings, equipment specifications, structural specifications
Drawing sheet 1 of 20
CLICK TO ENLARGE
Project site, shown at its exact location.
RESIDENTIAL

Residential Rooftop Solar + Battery — Full Project Sample

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A complete redacted permit set for a single-family rooftop PV system paired with a large battery energy storage bank. Homeowner name and exact site address removed from the title block and cover sheet on every page — including the pin label on the vicinity-map inset; the contractor (Hannah Solar, a separate installation company) contact information is also redacted as an outside party. The Electrical Engineer of Record (Natron Resources) design work is untouched.

SYSTEM
17.5 kWSTC / 13.34 kWAC · 46 Hanwha Qcells Q.PEAK DUO BLK ML-G9+ 380W modules · (46) Enphase IQ7PLUS-72-2-US microinverters · (10) Tesla Powerwall 2 (13.5 kWh each — 135 kWh bank) · (2) Tesla Backup Gateway · (2) Enphase IQ Combiner
CODES
2018 International Building Code / 2017 National Electric Code / 2018 International Fire Code
SHEETS
22 sheets — title sheet & electrical notes, site plan & detailed site plan, structural notes/layout/racking details, single line diagram, wiring calculations, equipment layout, labels & markings, equipment specifications, structural specifications
Drawing sheet 1 of 22
CLICK TO ENLARGE
Project site, shown at its exact location.
RESIDENTIAL

Residential Rooftop Solar + Battery — Full Project Sample

×

A complete redacted permit set for a single-family rooftop PV system paired with a battery energy storage unit. Homeowner name and exact site address removed from the title block and cover sheet on every page — including the pin label on the vicinity-map inset; the contractor (Phoenix Energy Solutions, a separate installation company, shown with both its Corporate and Jackson offices) contact information is also redacted as an outside party. The Electrical Engineer of Record (Natron Resources) design work is untouched.

SYSTEM
6.5 kWSTC / 5.22 kWAC · 18 LG Electronics LG360N1C-N5 360W modules · (18) Enphase IQ7PLUS-72-2-US SI-1R microinverters · Enphase Encharge-10-1P-NA (10.5 kWh) · Enphase Enpower smart switch, IQ Combiner & backup panelboard — an all-Enphase AC-coupled system
CODES
2019 California Building Code / 2019 California Electric Code / 2019 California Fire Code
SHEETS
20 sheets — title sheet & electrical notes, site plan & detailed site plan, structural notes/layout/racking assembly, single line diagram, wiring calculations, equipment layout, labels & markings, equipment specifications, structural specifications
Drawing sheet 1 of 20
CLICK TO ENLARGE
Project site, shown at its exact location.
RESIDENTIAL

Residential Rooftop Solar + Battery — Full Project Sample

×

A complete redacted permit set for a single-family rooftop PV system paired with a battery energy storage unit. Homeowner names and exact site address removed from the title block and cover sheet on every page — including the name pin on the project-site aerial photo and the pin label on the vicinity-map inset, plus the same address recurring on an interior shared-electrical-service warning label. The contractor (Spreck Energy / Spreck Solar & Design, a separate installation company) name, logo and contact information is also redacted as an outside party, wherever it repeats through the set. The Electrical Engineer of Record (Natron Resources) design work is untouched.

SYSTEM
7.2 kWSTC / 7.6 kWAC · 18 Solaria PowerXT-400R-PM 400W modules · (1) SolarEdge SE7600H-US inverter · (1) LG Chem RESU10H (9.8 kWh)
CODES
2019 California Building Code / 2019 California Electric Code / 2019 California Fire Code
SHEETS
21 sheets — title sheet & electrical notes, site plan & detailed site plan, structural notes/layout/Ironridge Flashfoot 2, single line diagram, wiring calculations, equipment layout, labels & markings, equipment specifications, structural specifications
Sheet 1 of 21
CLICK TO ENLARGE
Project site, shown at its exact location.
UTILITY-SCALE

Wildflower Solar — Full Project Sample

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A complete redacted as-built set for a 13 MWAC single-axis tracker ground-mount plant, from photovoltaic array site plan through grounding and trenching details. EPC/GC contact information and the engineer's seal removed; the electrical design work is untouched.

SYSTEM
13,000 kWAC / 16,500.96 kWDC · 40,796 modules · (115) Sungrow SG125HV inverters · NEXTracker single-axis · 92 acres
CODES
2017 National Electrical Code · Sacramento County AHJ
SHEETS
24 sheets — cover, site plan, general arrangement, one-line, electrical site plan, block arrangements, schedules, warning signs, details, grounding, trenching, equipment specs
Drawing sheet 1 of 24
CLICK TO ENLARGE
Project site, shown at its exact location.
UTILITY-SCALE

IMS (Indianapolis Motor Speedway) — Full Project Sample

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A complete redacted permit set for a 9 MWAC ground-mount plant, from array layout through single-line diagrams and interconnection details. Owner, general contractor and structural engineer contact information removed, along with the signed engineer's seal; the electrical design work is untouched.

SYSTEM
11,204.5 kWDC (9 MWAC) · 39,314 Trina TSM-285PA14 modules · 18 inverters · ground-mount, 821,103 sq ft array
CODES
IEC 2009 · IBC 2006 · Indianapolis AHJ
SHEETS
46 sheets — title, array layout, electrical layouts (18 inverters), single-line diagrams, wiring schedules, inverter pad layout, details, interconnection/POC package
Drawing sheet 1 of 46
CLICK TO ENLARGE
Project site, shown at its exact location.
COMMERCIAL

Cañada College — Full Project Sample

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A complete redacted permit set for a 1.25 MW hillside ground-mount array on a community college campus, interconnected at the customer’s 12.47 kV medium-voltage switchgear rather than at low voltage. Owner and general-contractor contact information removed, along with the engineer’s stamp and the consulting firm’s title-block identity; the electrical design work is untouched.

SYSTEM
1,250.5 kWSTC / 984 kWAC · 4,100 Canadian Solar CS6X-305P modules · 205 strings of 20 · 41 SMA Sunny Tripower STP 24000TL-US-10 inverters in two blocks (610 kWSTC / 480 kWAC and 640.5 kWSTC / 504 kWAC) · SMA CU 1000-US-10 combiners, 10×15A fuse · 84,682 sq ft array, 180,779 lbs
MEDIUM VOLTAGE
Eight 250A 480Y/277V 3Ø 4W solar panelboards (inverters on 40AF/40AT breakers) collected into two 800A 22 kAIC panelboards and 800A fused utility disconnects, stepped up by two 750 kVA 12.47Δ–480Y/277V pad-mount transformers (TR-A, TR-B) · tie at the existing campus 12.47 kV switchgear feeder breaker, protected by a fully redundant SEL-501 + SEL-351S 50/51 and 50N/51N pair on 200:5 CTs · all generation consumed on site
CODES
CEC 2013 · commercial construction · San Mateo County AHJ · ASHRAE Mountain View Moffett Fld design conditions (31 °C 2% high / 0 °C minimum mean extreme)
SHEETS
29 sheets — title, site and array plans, elevations, electrical notes, electrical site plans, lighting, stringing layouts, single-line and three-line diagrams, relay three-line and SEL-351S DC schematic, wiring schedule, equipment layouts, grounding, trench details, spec sheets, labels & markings, water line plan
Drawing sheet 1 of 29
CLICK TO ENLARGE
Project site, shown at its exact location.
COMMERCIAL

Castro Valley High School — Full Project Sample

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A complete redacted DSA (Division of the State Architect) permit set for a parking-lot photovoltaic canopy array across five campus buildings. School district, general contractor and mechanical-assembly contact information removed, along with the engineer's stamp; the electrical design work is untouched.

SYSTEM
731.5 kW · 3,048 Sharp 240W ND-H240Q2 modules · 17 parking canopies across 5 buildings · 53,483 sq ft array
CODES
2010 CBC/CEC/CMC/CPC (Title 24, Part 1) · DSA-reviewed · Alameda County AHJ
SHEETS
40 sheets — title, site plan, detailed array plans (5 buildings), canopy elevations, electrical site plans, single/three-line diagrams, wiring schedules, T-structure framing & details
Drawing sheet 1 of 40
CLICK TO ENLARGE
Project site, shown at its exact location.
COMMERCIAL

Cedar Lane Family Apartments — Full Project Sample

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A complete redacted issued-for-permit set for a rooftop PV array across twelve multifamily buildings. Owner/architect and structural engineer contact information removed, along with the engineer's stamp; the electrical design work is untouched.

SYSTEM
265.3 kWSTC (259.5 kWAC) · 804 SunPower E20-330-COM modules · 15 SolarEdge string inverters · 12 buildings, 2-story multifamily
CODES
2019 CBC/CEC/CFC (Title 24) · ASCE 7-16 · Yuba County AHJ
SHEETS
36 sheets — title, general notes, overall site plan, per-building site plans (12), electrical site plans, single-line & grounding diagrams, wiring schedule, equipment elevations, details, structural calculations
Drawing sheet 1 of 36
CLICK TO ENLARGE
Project site, shown at its exact location.
COMMERCIAL

Chico WWTP — Full Project Sample

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A complete redacted preliminary permit set for a ground-mount PV system at a municipal wastewater treatment plant, spanning two net-metering interconnections on the same parcel. General contractor and owner (City of Chico) contact information removed; no engineer's stamp appears on this preliminary issue. The electrical design work is untouched.

SYSTEM
1,879.2 kWDC (1,572 kWAC combined) · 3,480 Trina Solar TSM-540DEG19C.20 modules · NEM-MT + RES-BCT interconnections · ground-mount
CODES
2019 CEC/CBC/CFC · 2017 NEC · Butte County AHJ
SHEETS
31 sheets — title, general & array site plans (both systems), electrical site plans, single-line & grounding diagrams, wiring schedules, equipment layouts, details
Drawing sheet 1 of 31
CLICK TO ENLARGE
Project site, shown at its exact location.
COMMERCIAL

Kern County Sheriff-PD — Full Project Sample

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Complete redacted permit sets for all three PV/ESS systems at a Kern County government campus — parking canopy, rooftop and battery energy storage — each its own full drawing set. Client (County of Kern), contractor (SunPower / TotalEnergies) and all third-party structural consultants' contact information removed, along with every engineer's stamp; the electrical design work is untouched.

PV CANOPY
672.3 kWDC (500 kWAC) · 1,494 SunPower SPR-A450-COM modules · (9) SMA Core1 string inverters · parking canopy, fixed tilt · 31 sheets
PV ROOFTOP
320.32 kWDC (274.9 kWAC) · 728 SunPower SPR-A440-COM modules · (6) SMA Core1 string inverters · rooftop, fixed tilt · 26 sheets
BESS
Tesla Megapack 2 · 400 kVA / 367.2 kW, 1,468.8 kWh · 26 sheets
CODES
2019/2022 CBC/CEC/CFC · ASCE 7-16 · Occupancy Group B · Kern County AHJ
Drawing sheet 1 of 31
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Drawing sheet 1 of 26
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Drawing sheet 1 of 26
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Satellite view — project site, Bakersfield, California, showing the PV parking canopy and rooftop array in place
Project site — aerial imagery (Nov 2025) showing the parking canopy and rooftop array both in place.
COMMERCIAL

Meridian Park West — Full Project Sample

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A complete redacted record drawing set for a large rooftop Helix Dual-Tilt (HDT) PV system on a big-box distribution warehouse. Owner (Lewis Retail Centers), general contractor (SunPower Corporation) and the third-party structural engineer of record's contact information removed from the title block, along with the engineer's stamp on every sheet; the electrical design work is untouched.

SYSTEM
4.594 MWDC (3.652 MWAC) · 10,560 SunPower SPR-E20-435-COM 435W modules · 1,056 strings · Helix Dual Tilt (HDT) low-profile rooftop racking
CODES
2016 CBC/CEC · ASCE 7-10 · Riverside County AHJ
SHEETS
54 sheets — title & general notes, structural site/anchor/ballast plans (6 sub-arrays), electrical site plans, single-line & grounding diagrams, equipment & wiring details
Drawing sheet 1 of 54
CLICK TO ENLARGE
Project site, shown at its exact location.
COMMERCIAL

Sanger 2 — Full Project Sample

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A complete redacted permit set for a rooftop PV system across three multifamily buildings at an apartment complex. Client (Pacific West Architecture) and third-party structural engineer (DC Engineering) contact information removed from the title block, along with the engineer's stamp on every sheet — including a second, independent PE stamp embedded inside a racking manufacturer's structural certification letter; the electrical design work is untouched.

SYSTEM
219.8 kWDC (207.6 kWAC) · 666 SunPower SPR-E20-330-COM modules · (12) SolarEdge SE17.3kUS inverters · 3 buildings (F, G, H), pitched-roof mount
CODES
2019 CBC/CEC/CFC · Multi-dwelling occupancy · Fresno County AHJ
SHEETS
21 sheets — title & general notes, overall & per-building site plans, electrical site plans, single-line & grounding diagrams, wiring schedule, equipment elevations, details, labels & markings, spec sheets, structural calculations
Drawing sheet 1 of 21
CLICK TO ENLARGE
Project site, shown at its exact location.
COMMERCIAL

SCC Guadalupe Parkway — Full Project Sample

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A complete redacted installation plan for a fixed-tilt ground-mounted PV array on a County of Santa Clara parcel along the Guadalupe Parkway corridor. Client (County of Santa Clara Facilities and Fleet Dept.) and the third-party racking-manufacturer structural engineer (RBI Solar) contact information removed, along with the engineer's stamp on every sheet; the Civil, Electrical and Structural engineer-of-record credentials are all in-house SunPower design staff and are untouched.

SYSTEM
2,070.6 kWDC · 4,760 high-efficiency 435W modules · 476 strings (10 modules/string) · (68) 24kWAC string inverters · fixed-tilt dual-post ground mount
CODES
2013 CBC/CEC/California Energy & Fire Code · County of Santa Clara AHJ
SHEETS
31 sheets — title & general notes, electrical site plan & details, single-line diagram, grounding schematic, wiring schedule & equipment layout, trench & conduit routing, inverter & panelboard mounting/grounding details, bore plans & details, equipment spec sheets
Drawing sheet 1 of 31
CLICK TO ENLARGE
Project site, shown at its exact location.
COMMERCIAL

SCC Hellyer County Park — Full Project Sample

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A complete redacted installation plan for a fixed-tilt, dual-post ballasted ground-mounted PV array on a County of Santa Clara parcel within Hellyer County Park, adjacent to the county's velodrome. Client (County of Santa Clara Facilities and Fleet Dept.) and the third-party racking-manufacturer structural engineer (RBI Solar) contact information removed, along with the engineer's stamp on every sheet; the Civil, Electrical and Structural engineer-of-record credentials are all in-house SunPower design staff and are untouched.

SYSTEM
2,740.50 kWDC · 6,300 high-efficiency 435W modules · 630 strings (10 modules/string) · central inverter station with 2,500kVA step-up transformer & 27kV switchgear · fixed-tilt dual-post ballasted ground mount
CODES
2013 CBC/CEC/California Energy & Fire Code · County of Santa Clara AHJ
SHEETS
24 sheets — title & general notes, electrical site plan & details, single-line diagram, grounding schematic, equipment schedule & layout, conduit routing & elevation, module wiring & mounting details, inverter/panelboard mounting & grounding details, DAS details
Drawing sheet 1 of 24
CLICK TO ENLARGE
Project site, shown at its exact location.
COMMERCIAL

SCC Reid-Hillview Airport — Full Project Sample

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A complete redacted installation plan for a helix single-axis tracker PV array installed on airport land at Reid-Hillview County Airport. Client (County of Santa Clara Facilities and Fleet Dept.) contact information removed, along with the engineer's stamp on every sheet; the Civil, Electrical, Structural and Project Manager credentials are all in-house SunPower design staff and are untouched.

SYSTEM
1,044.00 kWDC · 2,400 high-efficiency 435W modules · 240 strings (10 modules/string) · (40) SMA 24.0kW Tri Power string inverters · helix single-axis tracker ground mount
CODES
2013 CBC/CEC/California Energy & Fire Code · County of Santa Clara AHJ
SHEETS
26 sheets — title & general notes, electrical site plan & detailed site plan, DC wiring plan, single-line diagram, grounding schematic, AC/DC wiring schematic, wiring schedule & equipment layout, helix ground trenching plan, wiring & mounting details, grounding details, MET & DAS details, TMAC wiring details
Drawing sheet 1 of 26
CLICK TO ENLARGE
Project site, shown at its exact location.
COMMERCIAL

Target T1329 Inglewood — Full Project Sample

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A complete redacted reinstallation plan for a helix single-tilt (HST) rooftop solar array reinstalled on an existing big-box retail store roof. Client (Target Corporation) contact information removed, along with the engineer's stamp on every sheet; the third-party structural engineer of record (Orie2 Engineering, a San Diego structural and bridge engineering firm) is also redacted as an outside consultant. The Electrical Engineer of Record (Natron Resources) and Contractor (SunPower Corporation) are in-house design/installation staff and are untouched.

SYSTEM
525.82 kWDC / 408 kWAC · 1,608 SunPower SPR-E20-327-COM 327W modules · 134 strings (12 modules/string) · (17) SMA 24.0kW string inverters · helix single-tilt rooftop racking, reinstalled on existing membrane roof
CODES
2016 California Electric Code / Building Code / Fire Code
SHEETS
29 sheets — title sheet & general notes, site plan, fire access & accessible path plans, helix tilt array structural calculations, ballast & anchor plans, racking & anchor details, electrical site plan & single-line diagram, grounding schematic, wiring schedule & equipment location, wiring & mounting details, DAS details, labels & spec sheets, roof painting & lighting drawings
Drawing sheet 1 of 29
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COMMERCIAL

Target T2855 San Diego — Full Project Sample

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A complete redacted record-drawing set for a helix single-tilt (HST) rooftop solar array plus a ground-mounted Tesla Battery Energy Storage System (BESS), installed on an existing big-box retail store roof and adjacent site. Client (Target Corporation) contact information is removed, along with the engineer's stamp on every sheet; the third-party structural engineer of record (PZSE Structural Engineers, a Roseville, California structural engineering firm) is also redacted as an outside consultant. The Electrical Engineer of Record (Natron Resources), Contractor and Civil Engineer (SunPower Corporation) are in-house design/installation staff and are untouched.

SYSTEM
917.85 kWSTC / 783.3 kWAC · 2,110 SunPower SPR-E20-435-COM 435W modules · 211 strings (10 modules/string) · helix single-tilt rooftop racking, plus ground-mounted Tesla Battery Energy Storage System (BESS)
CODES
2016 California Building Code / Electric Code / Energy Code / Fire Code
SHEETS
35 sheets — title sheet & general notes, site location & property line plan, grading & drainage plan, tree replanting plan, stormwater documents, structural general notes, structural layout, ballast & anchor plan, PV modules over roof framing, foundation plan, roof framing plan, tilt/IP panel elevations, helix racking & equipment rack details, equipment mounting details, electrical general notes, electrical site plan, string layout, single-line diagrams, grounding schematic, tap drawing, wiring schedule, equipment elevations & location, helix equipment rack details, trenching & conduit/wiring plans, MC cable & grounding details, monitoring wiring diagrams, labels & markings, spec sheets
Drawing sheet 1 of 35
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COMMERCIAL

Waimalu Plaza — Full Project Sample

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A complete redacted net-energy-metering permit set for a Hawaii retail centre: seven independent 208 V PV systems spread across five building rooftops, each landed on a different existing tenant service rather than on one common point of interconnection. Owner, general-contractor and structural-engineer contact information removed; the electrical design work is untouched.

SYSTEM
327.0 kWSTC / 304 kWAC · 1,000 SunPower SPR-327NE-WHT-D modules across five roofs · Tigo Energy MM-ES75 module-level electronics on every module · SolarBOS NEMA 4X string combiners (CS-12/16/20-15-4XF, plus a CS200 fused disconnect combiner) · 17,552.9 sq ft array, 41,006 lbs
SEVEN SYSTEMS
#1 and #2 — 75 kWAC Solectria PVI-75-208V, 80.1 kWSTC, 245 modules each · #3 and #4 — 50 kWAC Solectria PVI-50-208V, 54.9 kWSTC, 168 modules each · #5 — 30 kWAC as three Power-One PVI-10.0-I-OUTD-US, 32.04 kWSTC, 98 modules · #6 — 14 kWAC as two SMA Sunny Boy 7000-US, 15.6 kWSTC, 48 modules · #7 — 10 kWAC Power-One PVI-10.0-I-OUTD-US, 9.1 kWSTC, 28 modules
SERVICE TIE-IN
No single common point of interconnection — each of the seven systems lands on a customer-side line-side tap at an existing tenant meter on a 1200A 208Y/120V 3Ø 4W meter-stack bus, ahead of that tenant’s 225A or 200A main · isolation transformers integral to the Solectria units · 208Y/120V solar panelboards with Square D and Eaton fused AC disconnects
CODES
NEC 2008 · IBC 2006 · NFPA 1 2006 · City and County of Honolulu AHJ · ASHRAE Honolulu design conditions (32 °C 2% high / 14 °C minimum mean extreme)
SHEETS
31 sheets — title, site and array plans, five building elevations, electrical notes, electrical site plans, three single-line and three three-line diagrams (one pair per system group), two wiring schedules, five equipment layout plans, existing equipment plan, electrical details, spec sheets, three labels & markings sheets
Drawing sheet 1 of 31
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01

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Nirmal Chandra
NIRMAL CHANDRA
ELECTRICAL SYSTEMS DESIGN

For technical collaboration, design escalations, or a conversation about the tooling.

E-MAIL LINKEDIN RÉSUMÉ (PDF)
NIRMAL CHANDRA · AGRA, INDIA
SHEET 01 OF 01 · REV 2026.1