How to design and size a solar battery system

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/27031.pdf] IEEE Guide for the Characterization and Evaluation of Lithium-Based Batteries in Stationary Applications 1679.1-2017. [https://ieeexplore.ieee.org/document/8262521] Exceeding 3% voltage drop can result in cost vs. performance benefit (solar cell arrays). [https://ieeexplore.ieee.org/document/169305]