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Pick a fridge from the 20 whose makers publish a power figure, add the other things you run, and set how many days you want to go without charging. The tool adds up your watt-hours, then checks every battery and power station in our November 7, 2026 price check against that need.
How the calculation works
- Fridge: rated watts x the hours you set (24 by default, the worst case). If you choose the maker's daily figure and one is published, the tool uses it instead: EcoFlow GLACIER Classic "165wh/24h" as a fridge and "520wh/24h" as a freezer (77°F room, Eco mode), ICECO VL45 "0.347kw.h/24", ICECO APL20 "0.293KW.H/24H", Renogy 42 qt "around 1.4 kWh" a day in MAX mode.
- Other loads: watts x hours, added up.
- Energy to store: daily total x days without charging. The Ah figure divides by 12.8 V, the nominal voltage of a 12V LiFePO4 battery on the BougeRV and Renogy pages.
- Batteries: each unit counts for its rated Wh x its usable share. Published shares are used as is: 100% for Battle Born ("Usable Depth of Discharge | 100%"), 50% for Renogy AGM ("not to discharge the battery below 50%"). Rated Wh is the published energy (BougeRV 1280Wh, Renogy 2560Wh and 3840Wh), or the published voltage x Ah when no energy figure is given [calc].
- Power stations: none of the pages we read publishes a usable share, so your setting applies.
Worked example [calc], checked by hand: Renogy 42 qt fridge at 60 W for 24 h = 1,440 Wh, plus a 10 W light for 5 h = 50 Wh, gives 1,490 Wh a day. For 2 days: 2,980 Wh. A Battle Born 270Ah GC3 holds 12 V x 270 Ah x 100% = 3,240 Wh: one unit is enough. A Renogy 200Ah AGM holds 2,400 x 50% = 1,200 Wh: three units are needed.
Before you buy. A bigger battery means bigger cables, fuses and charging. Have the system sized and installed by a qualified installer and follow the battery and fridge manuals; lithium batteries need a charger and a low-temperature setting that match their chemistry.
Next: compare the batteries in detail in RV lithium batteries, or see what the roof can add in solar on the roof.
Frequently asked questions
Why does the tool assume the fridge runs 24 hours?
Because that is the only figure every maker publishes: rated watts. BougeRV itself writes that its 53 qt fridge would use 1.44 kWh in 24 hours at 60 W if it ran continuously. A compressor normally cycles, so the real figure is lower; lower the hours if you know your duty cycle, or use the maker's daily figure when one is published (EcoFlow, ICECO, Renogy).
What usable share should I set for my lithium battery?
Use what your maker publishes. Battle Born publishes 100% and the tool uses it; Renogy AGM says not to go below 50% and the tool uses that. For batteries without a published figure the tool starts at 80%, the depth of discharge Renogy uses for its 5,000-cycle-life figure, and you can change it.
Does the tool count the inverter?
No. If you run 120 V appliances through an inverter, its own losses and idle draw come on top. Check the inverter manual for its efficiency and no-load current, and add the difference as an extra appliance.
Why is a power station sometimes more expensive than a battery bank?
A power station includes the inverter, the charger and the outlets. A bare battery needs those parts, plus fuses and cabling, bought and installed separately. The tool compares stored energy only.