Solar
How Many Solar Panels Do You Need to Run a Fridge?
Short answer
A typical household fridge uses roughly 1 to 1.5 kWh a day. With about 4 kWh of solar energy per kWp per day, one 550 W panel can cover that in the daytime, and a battery of around 1.5 to 2 kWh lets it run at night. Add margin for the start-up surge and cloudy weather, and size the inverter for the fridge compressor.
Step 1: Find the daily energy use
Check the label for annual consumption in kWh, or measure with a plug-in energy meter. As a guide, a fridge-freezer of 150 W running about 40% of the time uses 150 × 24 × 0.4 ≈ 1.4 kWh a day. Efficient models use less.
Step 2: Size the panels
Panel size (kWp) = daily kWh × 1.2 ÷ 4. For 1.4 kWh: 1.4 × 1.2 ÷ 4 ≈ 0.42 kWp, so one 550 W panel is enough, two give a comfortable margin. The 1.2 allows for system losses.
Step 3: Size the battery (if you want night power)
Roughly half of a fridge's use happens at night, say 0.7 to 1 kWh. Allow for battery depth of discharge and a cloudy day. A usable 2 kWh lithium battery is a practical minimum for one fridge.
Step 4: Inverter
- A pure sine wave inverter of at least 1 kW handles most fridges.
- Check the compressor start-up surge; it can be three to six times running power.
- If you add TV, lights and Wi-Fi, size for the total. See what a 3 kW system can run.
Get a quick estimate
Use our solar calculator or ask us for a design.
Common questions
Can I run a fridge directly from a panel with no battery?
Not reliably. Clouds and nights interrupt it. A battery or grid connection is needed.
Is a solar fridge different from a normal fridge?
Dedicated DC solar fridges are very efficient, but normal fridges run fine on a properly sized inverter system.
How long will a battery run a fridge?
Divide usable battery kWh by the fridge daily use. A 2 kWh battery can cover roughly a day for an efficient fridge.