Template · Solar and storage

Rooftop PV riser, microinverters single line diagram

Roof array with microinverters, combiner and disconnect on the exterior wall, backfed breaker in the garage panel.

A free template with typical ratings, conductor callouts and general notes. Open it, change what differs on your job, fill in the title block and export a PDF.

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Rooftop PV riser, microinverters single line diagram: roof array with microinverters, combiner and disconnect on the exterior wall, backfed breaker in the garage panel. — Rooftop PV riser, microinverters. 16 devices on an 11 × 17 in sheet with a title block and notes column.

What the drawing shows

Every device on the sheet, in the order power reaches it.

Symbol	Label	Rating or detail	Conductors feeding it
Utility source	Utility service	120/240V 1φ 3W
Meter	Net meter	200A socket · bidirectional, by utility	Service conductors, per utility
Circuit breaker	200A 2P	Main breaker	3 #2/0 Cu
Panel	Main panel	200A bus · 120/240V
Ground	Grounding electrode system
Circuit breaker	Branch breakers
To (continues off sheet)	To house loads
Circuit breaker	40A 2P	PV backfeed
Disconnect switch	AC disconnect	60A non-fused · lockable	3 #8 Cu + #10 G, 3/4" EMT
Panel	PV AC combiner	125A bus · 240V	3 #8 Cu + #10 G
Circuit breaker	20A 2P	Branch 1
Junction box	Junction box	NEMA 3R	2 #10 Cu + #10 G, 3/4" EMT
Module with microinverter	PV branch 1	12 × 400W, microinverters · 1.21A	Trunk cable, + #10 G
Circuit breaker	20A 2P	Branch 2
Junction box	Junction box	NEMA 3R	2 #10 Cu + #10 G, 3/4" EMT
Module with microinverter	PV branch 2	12 × 400W, microinverters · 1.21A	Trunk cable, + #10 G

Notes on the sheet

Two branches of 12 microinverters: 24 × 1.21A = 29.0A; × 125% = 36.3A, so a 40A backfed breaker on #8 Cu (50A at 75 °C).
Each branch: 12 × 1.21A = 14.5A; × 125% = 18.2A, protected at 20A in the combiner.
Busbar check: 200A bus × 120% = 240A ≥ 200A main + 40A PV breaker = 240A. PV breaker at the opposite end of the bus from the main.
Net meter supplied and installed by the utility.
Microinverters provide module-level rapid shutdown. AC disconnect lockable and within sight of the meter.

Diagram is schematic and not to scale. Field-verify existing equipment ratings. Ratings and conductor sizes shown are typical. Confirm against the adopted code, the equipment listing and a load calculation before installation. Code references are to the 2023 NEC and the 2024 Canadian Electrical Code: see references and editions.