Learn how to calculate the battery capacity, or battery size, for your solar electric system.

⏱Timestamps:
0:06 Intro
0:53 Why are batteries needed?
1:10 What batteries are available?
1:40 What is the useable energy?
2:16 What is the battery longevity?
3:06 How to assess your energy demand
5:57 How to estimate system losses
6:23 round trip efficiency
7:07 wiring losses
7:32 conversion efficiency
8:20 How to calculate battery size
8:28 select a battery voltage
10:44 select days of autonomy
11:51 consider thermal losses
12:25 specify depth of discharge
13:42 calculate battery capacity
14:19 calculate number of batteries
15:14 Other videos and resources

For more information, visit: http://go.umd.edu/FarmSolar

Procedures for determining the performance of standalone photovoltaic systems. [https://www.nrel.gov/docs/fy99osti/27...]

IEEE Guide for the Characterization and Evaluation of LithiumBased Batteries in Stationary Applications 1679.12017. [https://ieeexplore.ieee.org/document/...]

Exceeding 3% voltage drop can result in cost vs. performance benefit (solar cell arrays). [https://ieeexplore.ieee.org/document/...]