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Cabin power

Battery, panel and inverter, and how much you actually need.

What you need

How

  1. Add up what you run in a day in watt hours: watts times hours for each thing. Lights and a phone are pennies. A fridge, a pump and a kettle are the whole bill.
  2. Size the battery for two or three days with no sun, not one.
  3. Size the panel to replace what you take out on a short cloudy winter day, not on a June afternoon.
  4. Fuse every line at the battery. Battery cable that shorts with no fuse starts a fire in seconds.
  5. Run heavy loads on DC straight off the battery where you can. An inverter costs you power just being switched on.
  6. Watch the meter. Guessing is how batteries get killed.

Watch for

Danger
  • Lead batteries pulled below half charge die early.
  • Lithium must not be charged below freezing.
  • Propane and any flame need real ventilation and a carbon monoxide detector.
  • A generator runs outside, never in a porch or a shed against the cabin.

Notes

Get the loads down before you buy panels. Efficient lights and a good cooler beat another panel on the roof.

solarbatteryinverter

Updated 2026-09-04

Related

Closing and opening the cabin Off Grid Shutting the cabin down for the winter so nothing freezes, rots or moves in, and opening it again in the spring without a nasty surprise. Heating with wood Off Grid Running a wood stove at the cabin: dry wood, a clean chimney, ashes put away right, and what to do if the chimney catches. Propane and carbon monoxide Off Grid Running propane at a cabin without gassing yourself, and the alarms that tell you before you feel it. Running a generator Off Grid Sizing a generator, where it sits, fuel and oil, and the two mistakes that kill people: running it inside and feeding the cabin through a wall plug.