Off-Grid Solar for Camper or Garden House

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Off-grid power for a camper or garden house
Add up your devices, then size the battery and the solar panel.
Example values, replace them with the data sheets of your devices. Devices: power and hours per day
fridge = 45 W * 8 h
lights = 12 W * 5 h
laptop = 60 W * 4 h
phones = 10 W * 3 h
pump = 40 W * 0.5 h Daily energy need
dailyNeed = fridge + lights + laptop + phones + pump to Wh Battery
systemVoltage = 12 V
daysWithoutSun = 2
maxDepth = 80 %
batteryEnergy = dailyNeed * daysWithoutSun / maxDepth to Wh
batteryCapacity = batteryEnergy / systemVoltage to Ah Solar panel
sunHours = 3 h
losses = 25 %
panelPower = dailyNeed / (sunHours * (1 - losses)) to W