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Proper Single-Cell/Module Replacement and Bypass Procedures

Curtis Ashton

Describes how single-cell/module replacements in series-connected strings can be tricky(a botched one, where only float current and not discharge current was taken into account, caused a famous fire that directly led to spill containment requirements). This is especially true when a single battery string is directly connected to a live load bus. This paper will explore the proper and safe methods of performing a single-cell changeout in many different situations: online or offline, paralleled with the load or not, with or without initial charge, etc.

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