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 stand-alone photovoltaic systems. [https://www.nrel.gov/docs/fy99osti/27...]

IEEE Guide for the Characterization and Evaluation of Lithium-Based Batteries in Stationary Applications 1679.1-2017. [https://ieeexplore.ieee.org/document/...]

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