PlugIn Solar Guru
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What size battery runs my fridge?

Plug-in solar makes power while the sun is up. Overnight and in an outage, the fridge runs on a battery or on the grid. This works out the battery size from your fridge's own number.

Example value. Take the kWh per year from the fridge's yellow EnergyGuide label and divide by 365, or measure a full day with a plug-in meter.
14 covers about 6 pm to 8 am. Use 72 for a three-day outage.
Example: a router and one LED lamp. 0 for the fridge alone.
Planning assumption for turning battery DC into 120 V AC.
Planning assumption. Cold and age reduce it.
Margin for a hot day, a full freezer door or an older battery.