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Fact-checked on Mar 18, 2026
A compressor fridge is the single most important appliance in a full-time van life setup — it runs 24 hours a day and typically accounts for 20-35% of your total daily power budget. Getting the sizing right determines whether you need 200Ah or 400Ah of battery. Getting it wrong means running out of power every overcast day.
Why compressor fridges vary so much in power use: the ambient temperature difference between fridge interior and outside air temperature is the main driver. At 20°C ambient with fridge at 4°C (16° differential): compressor runs ~30% of time. At 35°C ambient (southern European summer) with fridge at 4°C (31° differential): compressor runs ~60-70% of time. This nearly doubles your power consumption — always size for summer worst-case, not ideal conditions.
Expert tip
Never place your compressor fridge sideways — the compressor must be upright (some models tolerate 45° tilt briefly but prolonged tilting damages the compressor). Always ensure at least 5cm of airflow clearance at the back of the fridge, and point the fan exhaust toward an opening or vent in your insulation.
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
4h average sun hours
Recommended inverter
No 220V appliances — no inverter needed
Adjust these values with the calculator below
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
Comparison table
| Fridge Model | Capacity | Daily Draw (25°C) | Daily Draw (35°C) | Price Range |
|---|---|---|---|---|
| Engel MT35 | 15L | 20-28Ah | 38-48Ah | €600-750 |
| Alpicool C15 | 15L | 18-25Ah | 32-42Ah | €180-250 |
| BougeRV 30L | 30L | 25-35Ah | 45-62Ah | €250-350 |
| Dometic CFX-35 | 36L | 28-38Ah | 50-68Ah | €500-700 |
| ARB 50L | 50L | 32-42Ah | 57-75Ah | €700-900 |
| Dometic CFX-65 | 62L | 38-48Ah | 68-86Ah | €700-900 |
| Vitrifrigo C60i | 60L | 38-50Ah | 68-90Ah | €400-600 |
About this tool
Real-world power consumption data for popular van life compressor fridges, and how to correctly calculate your daily draw.
Measured Ah consumption per 24 hours (tested in 25°C ambient, fridge at 4°C, typical food load):
- Engel MT35: 20-28Ah/day (15L capacity, legendary reliability, very efficient but small)
- Dometic CFX-35 (2023): 28-38Ah/day (36L, WiFi monitoring, excellent build quality)
- Dometic CFX-65: 38-48Ah/day (62L, two-zone cooling/freezer available)
- ARB 50L: 32-42Ah/day (50L, extremely rugged, popular for 4WD)
- Alpicool C15: 18-25Ah/day (15L, budget option, good starter fridge)
- BougeRV 12V 30L: 25-35Ah/day (30L, growing reputation for value)
- Vitrifrigo C60i: 38-50Ah/day (60L, popular in European van builds)
Hot weather penalty: in 35°C ambient (Mediterranean summer), multiply all values × 1.7-2.0. A Dometic CFX-65 that draws 43Ah/day in 25°C ambient will draw 73-86Ah/day in 35°C ambient. If you plan to travel in Southern Europe in summer: size your battery bank for the hot weather figure.
Reducing fridge power consumption: insulate your fridge surroundings (not the fridge itself — it needs airflow, but the van walls and floor around it). Pre-cool fridge contents before loading. Never put warm food directly in → it forces the compressor to work extra to remove heat. Set fridge to 5-6°C instead of 2°C for 10-15% power reduction with negligible food safety impact. Freeze jerrycans of water and put in fridge when parked in shade — acts as thermal mass absorbing heat.
Two-zone vs single zone: Dometic CFX-65DZW has two independently controlled compartments (fridge + freezer). Total power draw is ~55-70Ah/day (25°C ambient) — about 15% more than a single-zone 65L fridge. For couples on longer trips: the dedicated freezer compartment reduces the need to buy new ice constantly.
Sizing your battery bank for fridge: Step 1: determine your fridge daily draw in worst-case ambient. Step 2: add all other loads. Step 3: calculate total daily draw. Step 4: determine autonomy (cloudy days with no solar charge). Typical full-time couple build: CFX-65 (55Ah) + lighting (5Ah) + phones/laptops (30Ah) + diesel heater (3Ah) + misc (10Ah) = 103Ah daily. For 2 days autonomy with 80% DoD LiFePO4: 103 × 2 ÷ 0.80 = 257Ah minimum → 300Ah LiFePO4 is the correct size.
Frequently asked questions
Which compressor fridge uses the least power for van life?▼
For minimum power: Engel MT35 (20-28Ah/day) and Alpicool C15 (18-25Ah/day) are the most efficient in the 15-35L class. Among larger fridges (50-65L): Dometic CFX-35 (28-38Ah/day for 36L) is consistently the most efficient per liter of capacity. Avoid cheap 12V thermoelectric (Peltier) coolers — they draw 4-6A continuously but only cool 15-25°C below ambient (useless in summer).
How much battery do I need for a 12V fridge in a van?▼
Minimum for a single person (35L fridge, moderate travel): 100Ah LiFePO4 matched with 200W solar. For a couple with a 60-65L fridge and frequent hot weather: 200-300Ah LiFePO4 minimum, 300-400W solar. The fridge alone uses 35-55Ah/day; total system typically needs 80-140Ah/day depending on lifestyle.
Is a freezer compartment worth it in a van?▼
Yes if you plan 2+ week trips without resupply. Saves significant space and money (no ice buying). No if you have regular access to shops (every 3-5 days). Power cost: a separate freezer zone adds 15-25% to your daily draw. The Dometic CFX-65DZW is the most popular dual-zone choice.
Can I run a compressor fridge on a 100Ah lead-acid (AGM) battery?▼
Technically yes, but you get only 50Ah usable from a 100Ah AGM. A typical 35L fridge uses 30-40Ah/day — you would exhaust the usable capacity in 12-16 hours. The minimum practical setup for 24-hour operation: 200Ah AGM (100Ah usable) with 200W solar. With LiFePO4: 100Ah LiFePO4 (90Ah usable) is the minimum viable setup.
Does a van fridge work while driving (alternator power)?▼
Yes — and this is one of the best times for it to run. While driving, the alternator charges the battery and powers the fridge simultaneously. After parking: the fridge runs on stored battery power. If you drive 4+ hours/day: your alternator contributes significantly to keeping the battery charged for fridge operation at night.
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