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A solar charger controller (SCC) can decently estimate the state of charge (SOC) of a lead acid battery by simply measuring the battery voltage. My understanding is that the battery voltage is not a good indicator of SOC for lithium iron phosphate (LFP) batteries. Shunts or battery monitors are...

I looked through many of the designs Will presents. It seems like few of them include a battery monitor or shunt. Then I searched the site and aside from a listing in the links to purchase items, I can't find descriptions of when to use battery monitors and shunts, and how they work. Yet I see...

Can someone give me their ideas on a swappable LFP battery (Sok, Chins, Redodo, Ampere Time... etc) in a 12V system at a cabin? During storms, especially in winter, power could be out for 2 to 20 days typically. It is a location without good sunlight. However, I can easily park nearby with a...