Running a Refrigerator or Freezer on Solar (Philippines)

A typical inverter refrigerator draws 100-150W while running but cycles on and off, averaging out to roughly 50-65 kWh a month — about what 1 solar panel produces in daytime output. The catch is that a fridge runs 24 hours a day, and panels only produce power while the sun’s up, so keeping it cold through the night on solar means adding a battery. Panels alone only cover the daytime half of the job.

How many watts does a refrigerator or freezer actually draw?

It depends heavily on compressor type and size, same as with aircon units. Inverter compressors modulate speed to hold temperature instead of switching fully on and off, which is why their average draw runs well below their rated wattage.

These are estimates — actual draw varies by brand, size, door seals, room temperature, and how often the door gets opened. Meralco’s appliance energy guide lists specific model wattages if you want to check a fridge you already own.

How many panels does that translate to?

Using the same bill-to-panel math as our how many solar panels do I need guide, a mid-size inverter refrigerator averaging around 50-65 kWh a month needs roughly 1 panel’s worth of daytime solar output. A larger combo unit or an older non-inverter fridge can push that to ~1-2 panels. Add a chest freezer and budget another panel or so on top.

That covers the fridge’s daytime draw. Since your panels are already producing more than the fridge alone needs during peak sun hours, the rest of that daytime capacity typically goes toward running your other daytime loads or gets exported through net metering — the fridge doesn’t need a dedicated system by itself.

Why does a fridge need a battery when other appliances don’t?

Because it’s the one appliance in most homes that never turns off. An aircon or washing machine only draws power when you’re using it, usually during the day — but a refrigerator draws power around the clock, including the 10-12 hours a night when a grid-tied solar system produces nothing. Without a battery, that overnight draw just comes from the grid as normal, which is fine for most households. If keeping the fridge running through a brownout matters to you — spoiled food after a typhoon outage is the classic scenario — that’s when a battery earns its cost. See our is a solar battery worth it guide for the full cost-versus-benefit breakdown.

How big a battery do I actually need just for refrigeration?

Smaller than most people assume. A fridge averaging 50-65 kWh a month works out to roughly 1-1.5 kWh overnight (about 2-3 kWh across a full day), which a compact LiFePO4 battery or even a mid-size portable power station can cover. That’s meaningfully cheaper than sizing a battery around whole-house backup. Our backup power overview covers both approaches — a small dedicated unit just for the fridge, or a larger hybrid battery that covers the fridge plus lighting, a router, and other essentials during an outage.

Does it matter if the fridge runs during the day or at night?

Not in the way it does for aircon or a washing machine, since a fridge runs continuously regardless of when you turn it on. What matters is whether your system is grid-tied (fridge draws from the grid at night, no backup) or has battery storage (fridge keeps running on stored solar power at night and during outages). If brownouts are common where you live, our solar backup for typhoons and brownouts guide walks through sizing backup around continuous loads like refrigeration specifically.

What if I’m just trying to keep the fridge running during outages, not save on my bill?

Then you don’t need a full solar system at all — a portable power station sized for a fridge’s overnight draw, recharged from the grid or a small panel, can keep it running through a typical outage for a fraction of the cost of a hybrid solar-plus-battery setup. Run your numbers through the cost calculator to compare a small backup-only setup against a full system that also cuts your bill.