Loading...
Pre-packaged "van solar kits" from camping stores cost $500-800 for 200W — and the MPPT controller is usually the cheapest unit they could find. Building your own kit from individual components saves 30-40% and lets you pick quality where it counts.
The 200W starter kit component list: 1× Renogy 200W rigid panel ($130), 1× Victron SmartSolar 20A MPPT ($120), 5m of 4mm² solar cable with MC4 connectors ($25), Z-bracket mounting kit ($20), cable gland IP68 ($8), 15A fuse + holder ($5). Total: ~$330 vs $500+ for a pre-made kit with a no-name MPPT.
⚡ Expert tip
Buy 20% more solar cable than your measurements suggest. Cable runs always end up longer than planned — routing around obstacles, leaving service loops, and future-proofing for panel repositioning. Running out of cable mid-install and splicing in an extension is ugly and adds resistance.
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
For a 400W kit: 2× Renogy 200W panels ($260), 1× Victron SmartSolar 30A MPPT ($170), 10m of 4mm² solar cable ($35), mounting hardware for 2 panels ($40), cable gland ($8), fuses ($10). Total: ~$525. A comparable pre-made 400W kit costs $700-1,000. Where NOT to save money: the MPPT controller. A $30 PWM controller on a $260 panel array wastes 15-30% of your solar production — that's $40-80 worth of energy lost per year. The Victron SmartSolar pays for itself within 6 months through better energy harvest AND Bluetooth monitoring that helps you optimize panel angle and shading. Where TO save money: mounting hardware (aluminum Z-brackets from Amazon are identical to "solar brand" brackets at 1/3 the price), cables (buy from an electrical supplier, not a solar store), and MC4 connectors (generic MC4 from Amazon work fine — they're a universal standard).
Frequently asked questions
How much does a DIY van solar kit cost?▼
200W kit: ~$330 (panel, MPPT, cable, mounting). 400W kit: ~$525. Compare to pre-made kits at $500-1,000 for the same capacity. You save 30-40% and get a better MPPT controller.
What's included in a pre-made solar kit that I'd build myself?▼
Panel(s), MPPT/PWM controller, MC4 cables, mounting brackets, cable gland. That's it. No battery, no fuse box, no distribution wiring. The kit only covers the solar side — you still need a complete 12V system.
Should I buy a kit or buy components separately?▼
Separate components. Pre-made kits save you 30 minutes of research but cost 30-40% more. The included controller is usually the weakest component — upgrading it alone costs nearly the same as building from scratch.
What solar panel brand for a van?▼
Renogy for budget (best $/watt). Victron BlueSolar for premium (best efficiency and ecosystem). Rich Solar and BougeRV are solid mid-range options. Avoid no-name Amazon panels — inconsistent quality and poor warranties.
Do I need an electrician to install solar on a van?▼
No. Solar installation is straightforward 12V DC wiring. If you can follow a wiring diagram and use a drill, you can install solar. The hardest part is drilling holes in the roof for mounts — go slow, seal well with Dicor.
Recommended gear
Editor's PickComplete 200W Solar KitPanel + MPPT controller + cables, ready to install.View on Amazon →Digital MultimeterMeasures voltage, current, resistance — essential for 12V wiring.View on Amazon →Electrical Crimping ToolReliable crimp connections on 0.5mm²–16mm² cables, no soldering.View on Amazon →