This battery bank calculator requires six user input values as described in the table below. Specifications is usually found in the battery datasheet, or in general by battery type elsewhere.

Description Input Result
Daily energy usage. Value can be found
and used with help from page #1.
[Wh]
1
Battery efficiency. Sometimes called round-trip efficiency.
[Wh]
2
Preferred battery DOD (depth-of-discharge).
[Wh]
3
Temperature efficiency, from operating at a
specific temperature.
[Wh]
4
Desired number of days the battery bank should function
as a backup during low irradiation weather conditions.
[Wh]
5
Desired battery bank voltage.
[Ah]

Your estimated battery bank capacity in amphours:

 [Ah]

Comments and improvement suggestions are always welcomed and appreciated.