Sprinter van
12 V · 400 W solar
//By MarinePowerLab — DC power · off-grid · RV & van · marine · solar+storage
Your permit-ready
electrical document pack.
From a template, in about ten minutes.
Pick a template, set your numbers, render the real deliverable — wire sizing, voltage drop, OCPD, one-line diagram, labels — every value computed against NEC and ABYC. No signup, no card.
full calculator · 3 free projects · watermarked PDF · no card · see a real report
NEC 310.16Ch.9 Tbl 8NEC 240.6ABYC E-11
drawing-sheet · one-linechecked
Sprinter van · 12 V · 400 W
Rev A · NEC 690 / 706 / 710
Rev A · NEC 690 / 706 / 710
11–13-page
Permit-ready PDF
2 codes
NEC + ABYC today
100%
Deterministic — same in, same out
~$5,000
What a stamped design costs
process
Parts list to permit-ready, in three moves.
01Design
Design
Drag components onto the canvas — or describe the system and let AI place them. Every wire is sized the moment you connect it.
panelmpptbatteryfuseinverter
02Check
Check
Run the NEC / ABYC compliance pass. Every violation is flagged with the exact clause and the fix — not a vague warning.
✓ Overcurrent OK — NEC 240.6
!Fuse > 7" from battery — ABYC E-11
03Export
Export
Generate the insurance-grade PDF — one-line diagram, BOM with SKUs, full calculation appendix, and a plain-English AI summary.
coverage
One engine. Van, cabin, hull, or rig.
The same deterministic calculator drives DC van & RV builds, off-grid cabins and tiny homes, specialty & mobile rigs, small solar+storage, and ABYC marine refits. These are live templates — open any one and start from a working design.
NEC 690 / 706 / 710
Off-grid cabin
48 V · 2 kW solar
Sailboat refit
12 V marine
Solar + storage
24 V · 1.2 kW PV
the deliverable
What lands in the PDF.
- 01Cover + project header
- 02Executive summary
- 03One-line schematic
- 04Bill of materials (SKUs)
- 05Wire-sizing calculations
- 06Voltage-drop analysis
- 07Overcurrent protection
- 08Compliance checklist
- 09References + AI summary
Bill of materials
| Qty | Component | Spec | Basis |
|---|---|---|---|
| 1 | Solar array | 400 W · Voc 49 · Isc 11 | NEC 690.8 |
| 1 | MPPT controller | 50 A | 690.8(B) |
| 1 | LiFePO₄ bank | 200 Ah · 12 V | NEC 706 |
| 1 | Class-T fuse | 250 A | NEC 240.6 |
| 1 | Inverter | 2000 W / 4000 W surge | NEC 690.8 |
Wire runs — sized to ampacityall ✓
| Run | Length | Current | Basis |
|---|---|---|---|
| Battery → Fuse | 1 ft | 180 A | NEC 310.16 |
| MPPT → Battery | 3 ft | 50 A | NEC 310.16 |
| Solar → MPPT | 8 ft | 11 A | NEC 690.8 |
Values from the Sprinter-van template · illustrative of the output
Don't take our word for it — download the whole thing.
Three complete sample document packs, rendered by the same engine you'll use, watermarked as samples. Every number in them is computed, not typed.
4-page PDF · watermarked sample
EV charger — metered demand
NEC 220.87 · the existing 100 A service holds · no upgrade
Download the real output ↓
4-page PDF · watermarked sample
EV charger — service upgrade
NEC 220.83 · 118 A calculated · 125 A service required
Download the real output ↓
12-page PDF · watermarked sample
Sprinter van — 12 V
400 W solar · lithium · NEC 690/706
Download the real output ↓
11-page PDF · watermarked sample
Off-grid cabin — 48 V
PV + ESS · NEC 690/706/710
Download the real output ↓
13-page PDF · watermarked sample
Sailboat refit — ABYC
ABYC E-11 · engine-space derating
Download the real output ↓
12-page PDF · watermarked sample
Food truck — 24 V
600 W solar · specialty/mobile · NEC 690/706
Download the real output ↓
11-page PDF · watermarked sample
Solar + storage — 24 V
1.2 kW PV + storage · NEC 690/706/710
Download the real output ↓
why it holds up
Not just another chatbot answer.
Deterministic & cited
The same inputs always produce the same answer — each one traceable to NEC 310.16, Ch.9 Table 8, 240.6, or ABYC E-11. Auditable, not a guess.
A document people accept
Inspectors and insurers get a formatted report with a one-line diagram and sign-off blocks — not a chat transcript they have to trust.
Honest by design
It is not a P.Eng stamp, and it says so on every page. Built to aid your installer, surveyor, and underwriter — never to impersonate them.
pricing
Permit-ready electrical documents, cited line by line.
Every single-run calculator is free forever, with its code citations, and no signup. You pay for the document — the code-cited pack an inspector will read. All prices in USD.
Free
Free
no card, forever
Every single-run calculator, with code citations — no signup, forever. We never paywall the math.
Start free — no cardNo subscription
Compliance Pack
$79USD one-time
one-time · no subscription
The full code-cited documentation pack — residential EV charger and panel upgrades (NEC 220.83 / 220.87), plus off-grid, RV/van, marine and solar+storage.
Generate a packMost popular
Solo
$290/yrUSD
≈$25/mo billed annually · or $39/mo month-to-month
For the one-person shop. Unlimited work, one price.
Start 14-day trialBusiness
$790/yrUSD
≈$66/mo billed annually · or $99/mo month-to-month
For the shop that hands documents to a client: your branding on the page, and the exports to back it up.
Start 14-day trialFounding member: Solo at $190 USD/yr locked for life, first 100 subscribers · Your price never increases while you're subscribed. Full ladder on pricing
Free — forever
Every single-run calculator with its citations, no signup · sign up free for 3 saved projects · watermarked PDF previews. The math is identical on every tier.
A subscription adds
Unlimited unwatermarked Compliance Packs · unlimited saved projects · the quoting engine · white-label PDFs on Business. You pay for the deliverable and the workflow, not the answers.
Scope: an electrical documentation package — not a stamped full plan set. Verify with a licensed professional before installation. How we verify our tables
common questions
Is this a P.Eng / PE stamp?+
No — it is design documentation generated from your input and published codes. It does not replace a stamp where one is required. Verify with a licensed professional before installation.
What codes are supported?+
NEC 690 / 706 / 710 and ABYC E-11. Those are the two code bases you can select today; Canadian CEC work is in the engine but is not yet selectable for documents.
Can I use it for insurance or an AHJ?+
It produces the kind of documentation that aids their review. Final approval rests with the AHJ or carrier.
Render the document. Judge it yourself.
Pick a template, set your numbers, and get the real deliverable in about ten minutes — free, no card.