A solar fridge is usually not a special fridge — it is an ordinary one on a correctly sized inverter and battery. Inverter-compressor fridges make it easier.
People mean two different things by a solar fridge: a DC appliance built for 12 or 24 volts, or an ordinary household fridge running inside a solar system. The second is what most homes need, and it does not mean replacing the fridge.
Why a fridge is both an easy and a hard load
Easy, because its daily energy is modest. Hard, because the compressor draws several times its running power for a second or two at start-up. An inverter sized for the average but not the start will trip — which is behind most complaints that an inverter will not run a fridge.
Which is where inverter fridges help
An inverter fridge — a variable-speed compressor — ramps up instead of slamming on, so its inrush is far lower. If you are buying a fridge anyway, that choice shrinks the inverter you need and lowers the daily draw.
Sizing, in three steps
- Read the daily kWh off the appliance's energy label
- Multiply by the days of backup you want to get battery capacity
- Choose an inverter whose surge rating covers the compressor's start, not just its running watts — each inverter page states continuous and peak output
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