John,
Thanks for the reply. So, how do I know what my low voltage alarm should be set at? The voltage varies with different loading levels, and I thought the only way to determine state of charge using voltage alone is with the bank at rest for 24 hours. My bank is 48V F.L.A.
Chris
Sent from my iPhone
Sent from my iPhone
Chris,If you went STRICTLY on power usage, that would be true.Hopefully (!!), the BMS also has a minimal voltage that would be a separate limit.You are correct, that as the battery ages, it won't hold up as long on a charge. You'll basically get to the lower voltage limit faster. But as long as you have a lower voltage limit alarm / cutoff / warning, you'd be ok.JohnFrom: "clh5_98@yahoo.com" <clh5_98@yahoo.com>
To: electricboats@yahoogroups.com
Sent: Tuesday, December 24, 2013 4:23 PM
Subject: [Electric Boats] Battery capacity reduction over time
Hi Group. I have a battery state of charge monitor for my bank. It looks at discharge rate, applies the Peukert value and the bank size in AH programmed by the user. This works fine for a newer bank, but what about a bank with a few years on it? Should some adjustment in the settings be made over time to the meter to account for decreasing capacity over time? As the battery ages could we unknowingly be killing our banks by discharging them deeper and deeper as they age? Thanks, Chris
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