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Everyone talks about rooftop solar for houses, but nobody runs the numbers for vans. Thing is, the ROI on van solar is way better than residential. I did the math with 2026 prices, and the figures speak for themselves. Spoiler: payback is faster than you think.
A complete van solar kit costs between $800 and $1,200 (panels + MPPT controller + wiring). If you live in a van full-time, you save $3–5/night in campground hookup fees. Over 200 nights a year, that's $600–1,000 in savings. The kit pays for itself in 12 to 18 months. Residential solar payback? More like 7–10 years. The van wins hands down.
⚡ Expert tip
Keep a spreadsheet of your actual savings: log every night where solar was enough and you would have otherwise paid for a hookup. After 6 months, you'll have your personal ROI — and the motivation to optimize the setup.
Example calculation for your setup
Results based on a typical use case
| Appliance | Power | Usage/day | Wh/day |
|---|---|---|---|
| Compression fridge | 45W | 24h | 1080 |
| LED lighting | 20W | 4h | 80 |
| Water pump | 30W | 0.5h | 15 |
| Phone charging | 15W | 2h | 30 |
| Daily consumption | 1205 Wh | ||
Recommended solar panels
302 Wc
4h average sun hours
Adjust these values with the calculator below
VANPOWERCALC PROYOUR ENERGY PROFILE
YOUR ENERGY PROFILE.
This document contains the sizing of your future electrical installation, calculated based on your appliances.
Minimum Daily Consumption
0 WH / DAY
Inventory:
SYSTEM SIZINGPage 2
Battery
To guarantee 0WH without damaging your bank (80% max discharge):
0 AH
LiFePO4 12V
Solar
Minimum power required to recharge your consumption:
0 W
via MPPT
220V AC
Maximum power (with 25% safety margin).
0 W
No Need
Safety & CablingPage 3
12V Cable Sizing Guide
Use this professional reference table to select the correct gauge (mm²) for your cables. For 12V in a van, the maximum tolerated voltage drop is 3%. Always use multi-stranded flexible automotive wire.
| Current (A) | Round trip < 2m | Round trip 4m | Round trip 6m |
|---|---|---|---|
| 5A (LEDs, USB) | 1.5 mm² | 2.5 mm² | 4 mm² |
| 10A (Fridge, Pump) | 2.5 mm² | 4 mm² | 6 mm² |
| 20A (Heater) | 4 mm² | 10 mm² | 10 mm² |
| 50A (DC/DC Booster) | 10 mm² | 16 mm² | 25 mm² |
| 100A (Inverter) | 25 mm² | 35 mm² | 50 mm² |
Fuse Sizing
The fuse protects the wire, not the appliance. Always place it as close to the power source as possible (battery or busbar).
- Wire 1.5 mm² → Max fuse 10A
- Wire 2.5 mm² → Max fuse 20A
- Wire 4 mm² → Max fuse 30A
- Wire 6 mm² → Max fuse 40A
- Wire 10 mm² → Max fuse 60A
SCHÉMA ÉLECTRIQUE
PANNEAUX SOLAIRES
0W
REGULATEUR MPPT
BATTERIE AUXILIAIRE
0 Ah
Lithium LiFePO4
FUSIBLE
FUSIBLE
BOÎTE À FUSIBLES 12V
Pompe, Leds, Frigo...
CONVERTISSEUR 220V
NON REQUI
PRO GEARPage 4
SHOPPING LIST
Where to find this equipment? Here is the community-approved selection.
12V 6-way Fuse Box
Mandatory protection
Digital Multimeter
Test your connections
Heavy Duty Crimping Tool
For perfect lugs
Heat Shrink Tubing
Insulation and safety
GENERATED BY VANPOWERCALC PRO - UNLIMITED.
About this tool
Let's do the full calculation including the battery. A complete solar + storage setup for a van runs $2,000–4,000: panels ($400–600), MPPT controller ($100–200), 200Ah LiFePO4 ($400–800), wiring and fuses ($100–200), inverter ($150–400).\n\nAnnual savings for a full-time vanlifer:\n- Campground hookups avoided: $600–1,000/year ($3–5 x 200 nights)\n- No residential electricity bill: $2,000/year (if alternative = apartment)\n- Total savings: $2,600–3,000/year\n\nPayback on the complete setup: 12 to 24 months. After that? Pure profit for 8–10 years (LiFePO4 lifespan). Compare that to a residential 3kW system at $7,000–9,000 that takes 7–10 years to break even. The van hits payback 4–5x faster.
Frequently asked questions
How long until van solar pays for itself?▼
Between 12 and 24 months for a full setup (panels + battery + inverter) if you live in the van full-time. Just panels + controller ($800–1,200) breaks even in 8–12 months. Payback depends mostly on how many nights you go autonomous vs paying for hookups.
How much money does van solar save?▼
On average $3–5 per night in avoided campground hookups. Over 200 nights/year, that's $600–1,000. If you add the savings vs a fixed residence ($2,000/year in electricity), the total hits $2,600–3,000/year.
Is residential solar more profitable than van solar?▼
No, it's the opposite. Van solar has a 1–2 year payback, versus 7–10 years for residential. The van benefits from much lower installation cost and immediate savings. Residential produces more in absolute terms but costs far more.
How much solar production can I expect on a van?▼
With 400W of panels, expect 1,600–1,900Wh/day in summer (southern latitudes) and 500–700Wh/day in winter. Annual average around 1,100–1,300Wh/day. That's enough for standard use: fridge, laptop, lights, device charging.
Do I need a huge battery to maximize solar ROI?▼
Not necessarily. A 200Ah LiFePO4 ($400–800) is the sweet spot. Going to 300–400Ah only improves ROI if you frequently spend 3+ days without sun. Better to invest in quality panels and a good MPPT controller.
Recommended gear
Editor's PickComplete 200W Solar KitPanel + MPPT controller + cables, ready to install.View on Amazon →Editor's PickLiFePO4 Battery 100Ah100% usable capacity, 3000+ cycles, built-in BMS.View on Amazon →Digital MultimeterMeasures voltage, current, resistance — essential for 12V wiring.View on Amazon →