Template · Solar and storage

Grid-tied PV, microinverters single line diagram

Two microinverter branches combined in an AC combiner. Use this for a rooftop system with a microinverter under each module. The circuits are AC from the roof down, joined in an AC combiner and landed on one breaker in the main 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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Grid-tied PV, microinverters single line diagram: two microinverter branches combined in an AC combiner. — Grid-tied PV, microinverters. 13 devices on an 11 × 17 in sheet with a title block and notes column.

What the reviewer checks on this drawing

The reviewer checks the number of microinverters and their combined current at 125%, the combiner, the busbar arithmetic, and that the microinverters provide module-level rapid shutdown.

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	Utility meter	200A socket	Service conductors, per utility
Circuit breaker	200A 2P	Main breaker
Panel	Main panel	200A bus · 120/240V
Circuit breaker	Existing	Branch breakers
Load	Existing loads
Circuit breaker	30A 2P	PV backfeed
Disconnect switch	AC disconnect	30A non-fused, lockable	3 #10 Cu + #10 G
Panel	AC combiner	60A · 240V
Circuit breaker	20A 2P	Branch 1
PV array	PV branch 1	9 modules with microinverters
Circuit breaker	20A 2P	Branch 2
PV array	PV branch 2	9 modules with microinverters

Notes on the sheet

18 microinverters × 1.21A = 21.8A; × 125% = 27.2A, protected at 30A.
Busbar check: 200A bus × 120% = 240A ≥ 200A main + 30A PV breaker. PV breaker at the opposite end of the bus from the main.
Microinverters provide module-level rapid shutdown.

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.