I wonder if some of the cheap, not so effective "gas gauges" are working off voltage. It would be really rough, but at least give you a vague idea of whether you were topped off, or getting dangerously low.
From: king_of_neworleans <no_reply@yahoogroups.com>
To: electricboats@yahoogroups.com
Sent: Thursday, December 8, 2016 9:45 PM
Subject: [Electric Boats] Re: How Do you calculate State Of Charge, from charging amps and hours?
Yeah, flooded cell golf cart batteries, to be specific.
I was thinking also that more power actually gets stored instead of wasted, when the batteries are being charged while still down below 80% SOC. I am just going by the obvious, that when you are trying to charge a fully charged battery, you are just spinning your wheels. So I think there must also be some relationship between State Of Charge, and how completely the battery actually accepts and stores the amps being forced into it.
I am afraid I will just have to construct a table or set of tables from empirical data. It looks very complex. But aren't there "gas gauge" meters that track both charge and discharge? What sort of algorithm do they use, I wonder? I know a lot of them are inaccurate to the point of near uselessness, but still it is a starting place.
Probably you are right about it being a linear thing, if the charge rate is at C/20 or thereabouts, AND the batteries are operating at between 50% and maybe 85% full. A rather knowledgeable electrician once told me to expect to get 80% of the amps out that I put in with the charger. Sounds like an extremely general rule! But maybe operating in the "general" zone would allow a "general" rule to work with a useful degree of accuracy.
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Posted by: oak <oak_box@yahoo.com>
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