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I've priced out dozens of van builds at this point, and the electrical system typically eats 20-40% of your total conversion budget. A basic weekend setup starts around $900. A full digital nomad rig with 300Ah lithium and 400W solar? You're looking at $3,500-5,000.
Here's the honest breakdown: battery is your biggest line item — $350-500 for a 100Ah LiFePO4, $650-900 for 200Ah, $1,200-1,600 for 300Ah. Solar comes second at $250-450 for 200-400W of rigid panels plus an MPPT controller. Then wiring, fuses, and distribution add $200-400 that most people forget to budget for.
⚡ Expert tip
Buy your heavy gauge cable (4 AWG / 25mm²+) from an auto parts store or marine supplier — not a campervan shop. Same cable, literally half the price. I saved $120 on my last build just by sourcing cable and lugs from an industrial supplier instead of a vanlife store.
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 LiFePO4 battery
126 Ah
(80% depth of discharge)
Recommended AGM battery
201 Ah
(50% depth of discharge)
Recommended solar panels
302 Wc
4h average sun hours
Recommended inverter
No 220V appliances — no inverter needed
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
The thing nobody tells you about van electrical budgets: the small stuff adds up fast. MC4 connectors, cable glands, heat shrink, ring terminals, a fuse block, a bus bar — these miscellaneous items easily hit $150-250. I always tell people to add 20% padding to whatever number they calculate. The DC-DC charger ($150-300) and shore power inlet ($80-150) are technically optional but I consider them non-negotiable for any build you plan to live in. An inverter ranges from $200 for a 1000W pure sine to $450+ for 2000W — skip modified sine unless you only run a kettle. Battery monitor ($70-150) is another easy-to-forget item that pays for itself by preventing overdischarge.
Frequently asked questions
What's the minimum budget for a functional van electrical system?▼
Around $900-1,200 gets you a working system: 100Ah LiFePO4 battery (~$400), 200W solar panel + MPPT (~$250), basic wiring and fuse block (~$200), and a budget DC-DC charger (~$150). That covers a fridge, lighting, and phone charging for weekend trips.
Is it cheaper to buy a kit or individual components?▼
Individual components, almost every time. Pre-built kits from van outfitters typically cost 40-60% more than sourcing the same parts separately. The trade-off is you need to plan compatibility yourself — but that's what the calculator on this site is for.
How much for a digital nomad electrical setup?▼
$3,500-5,000 for a proper work-from-van setup: 200-300Ah LiFePO4 ($800-1,400), 400W solar ($400), DC-DC 30A charger ($250-300), 2000W pure sine inverter ($350-450), battery monitor ($100), and complete wiring ($400). Don't forget the Starlink — that's another $600 for the Mini.
Where should I NOT cut costs?▼
Never cheap out on the battery or the DC-DC charger. A failed BMS can brick a $600 battery. And a cheap DC-DC that doesn't properly limit current can overheat your alternator — I've seen this happen twice. Cables and fuses are also not the place to save $30.
How much does professional installation cost vs DIY?▼
A professional campervan electrician charges $800-2,000 for labor on top of parts, depending on complexity. DIY saves that money but takes 2-4 weekends for a first-timer. If you're comfortable with basic wiring and following a diagram, DIY is absolutely doable.
Recommended gear
Editor's PickLiFePO4 Battery 100Ah100% usable capacity, 3000+ cycles, built-in BMS.View on Amazon →Editor's PickComplete 200W Solar KitPanel + MPPT controller + cables, ready to install.View on Amazon →12V Fuse BoxProtects each circuit independently, easy installation.View on Amazon →Electrical Crimping ToolReliable crimp connections on 0.5mm²–16mm² cables, no soldering.View on Amazon →