live sample · generated from a template

Sprinter van — 12V, 400W solar

NEC 690 / 706 / 710 — US off-grid, PV, energy storage · Rev A · 2026-08-06

The actual output of the CircuitProof engine — deterministic wire sizing, breaker selection, and code checks run against NEC 690 / 706 / 710 — US off-grid, PV, energy storage. The same report exports as an 11–13-page permit-ready PDF.

drawing-sheet · one-linereview

Sprinter van — 12V, 400W solar · 12 V
Rev A · NEC 690 / 706 / 710 — US off-grid, PV, energy storage

12 V

System voltage

2,400 Wh

Battery bank

400 W

Solar array

120 W

Peak load

Wire runs sized

Items to review

Bill of materials

Qty	Item	Mfr	Spec
1×	Solar panel	Renogy	400 W
1×	Charge controller	Victron	50 A
1×	Battery	Battle Born	200 Ah @ 12 V
1×	Fuse	Blue Sea	250 A
1×	Inverter / charger	Victron	2000 W continuous
1×	DC load	—	120 W

Wire runs · NEC 310.16

From	To	AWG	Breaker	VD
Solar panel	Charge controller	12	15 A	2.9%
Charge controller	Battery	6	70 A	1.2%
Battery	Fuse	4/0	225 A	0.2%
Fuse	Inverter / charger	4/0	225 A	0.2%
Battery	DC load	12	20 A	3.0%

compliance

Code checks against NEC 690 / 706 / 710 — US off-grid, PV, energy storage.

NEC 690.8(A)(1)

Charge controller rated ≥125% of PV short-circuit current.

NEC 240.4

Fuse 250A exceeds the 200A ampacity of its 3/0 AWG conductor — protect the wire, not just the load.

NEC 240.4

Fuse 250A exceeds the 200A ampacity of its 3/0 AWG conductor — protect the wire, not just the load.

Design

Inverter has no battery or busbar feeding it.

Best practice

No battery monitor/shunt — recommended for accurate state-of-charge.

Design (BMS charge limit)

LiFePO4 bank with charge sources modeled but no max_charge_a set. Add the bank's BMS/manufacturer max charge current to the battery attributes to check the combined charge-source total against it.