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Fact-checked on Mar 28, 2026
VANPOWERCALC.COMYOUR 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
RÉGULATEUR 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.COM
Everyone says van electrical systems cost a fortune. What if we proved them wrong? With €500 and smart choices, you can build a functional system to charge devices, light your van, and run a small 12V fridge. The secret: an AGM battery (no lithium at this price), an entry-level solar panel, and a PWM controller.
This setup is perfect for weekends and summer holidays. You won't run a laptop and air conditioner, but you'll have the essentials: LED lights, USB charging, a 12V fan, and a small compressor fridge. It's the ideal starting point to test vanlife without breaking the bank.
Expert tip
Pro tip: don't neglect alternator charging. Run a 6mm² cable from the starter battery to your auxiliary battery via a split-charge relay (~€30). One hour of driving recovers 30-40Ah — that's often more than solar in winter. This alternator + solar combo is the key to a budget build that works year-round.
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
151 Ah
(80% depth of discharge)
Recommended AGM battery
241 Ah
(50% depth of discharge)
Recommended solar panels
402 Wc
Comparison table
| Component | Model | Specs | Price |
|---|---|---|---|
| AGM Battery | Varta LFD90 | 90Ah, 12V, 25kg | ~€120 |
| Solar Panel | Renogy 100W Mono | 100W, 1200x540mm | ~€95 |
| PWM Controller | Renogy Wanderer 10A | 10A, 12V/24V | ~€25 |
| Solar Cables | MC4 + 4mm² | 5m, connectors included | ~€20 |
| Fuse Box | Blue Sea ST Blade | 6 circuits, 12V | ~€35 |
| Fuses + Holders | ANL 60A + blade | Battery + circuit protection | ~€15 |
| Battery Cable | 25mm² red/black |
About this tool
The Challenge: A Complete Van Electrical Setup for Under €500#
The electrical system is often the most intimidating part of a van conversion. YouTube builds routinely exceed €3,000. But is all that really necessary to get started?
Our Budget Philosophy#
This build is based on 3 principles:
- AGM over lithium — a Varta LFD90 90Ah costs ~€120 vs €400+ for LiFePO4
- PWM over MPPT — a Renogy Wanderer 10A at €25 does the job for a single panel
- One panel only — 100W is enough for 400-500Wh/day in summer in Europe
What This Setup Can Power#
- LED lighting: 5 spots x 3W = 15W for 4h = 60Wh
- Smartphone charging x2: 20Wh
- 12V fan: 15W for 6h = 90Wh
- Compact 12V fridge (35L): ~30Ah/day = 360Wh
- Total: ~530Wh/day
With a 90Ah AGM battery (usable capacity ~45Ah at 50% DOD = 540Wh), you just cover one day. The solar panel recharges in 4-5 hours of sun.
Honest Limitations#
- No 230V inverter — forget the hair dryer and coffee machine
- No winter autonomy — in December, a single 100W panel produces ~150Wh/day
- Heavy battery — 25kg for a 90Ah AGM vs 10kg for lithium
- Limited lifespan — 300-400 cycles for AGM vs 3,000+ for LiFePO4
Upgrade Path#
When you're ready to invest more, the first upgrade is a LiFePO4 100Ah battery (~€350). You'll double your usable capacity and cut the weight by 2.5x.
Frequently asked questions
Is €500 really enough for van electrical?▼
Yes, if you stick to entry-level components: AGM battery (not lithium), PWM controller (not MPPT), and a single 100W solar panel. This setup covers essentials: LED lights, USB charging, fan, and a small 12V fridge. The trade-off is no 230V inverter and limited winter autonomy.
Why AGM instead of LiFePO4 at this budget?▼
A 90Ah AGM costs about €120 vs €350-500 for a 100Ah LiFePO4. AGM is heavier (25kg vs 10kg) and only discharges to 50%, but it's reliable and needs no external BMS. It's the best value for a first build.
Can you run a 12V fridge on this setup?▼
Yes, a 35L compressor fridge like the Alpicool C15 draws about 30Ah/day. With a 90Ah AGM (45Ah usable) and a 100W panel, you have enough for the fridge plus lights and charging — in summer. In winter, you'll need to supplement with alternator charging.
What's the first upgrade to make?▼
Switch to a LiFePO4 100Ah battery (~€350). You'll double usable capacity (100Ah vs 45Ah), cut weight by 2.5x, and go from 300 cycles to 3,000+. It's the single upgrade that transforms daily vanlife the most.
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