Some cool battery graphs
I'm checking out the Costco GC2 batteries and Iota 55A converter as well as the new 16-bit a/d for Arduino. Prior to discharging the 208AH GC2 batteries, they were top charged with 16V for about ...
Forum Discussion
Here's what Victron says in their BMV-700 manual:
3.3.2
About charge efficiency (CEF) The charge efficiency of a lead acid battery is almost 100% as long as no gas generation takes place. Gassing means that part of the charge current is not transformed into chemical energy, which is stored in the plates of the battery, but is used to decompose water in to oxygen and hydrogen gas (highly explosive!). The “Amp-hours” stored in the plates can be retrieved during the next discharge, whereas the “Amp-hours” used to decompose water are lost.
That's close to what I stated. Gassing voltage is at about 14.4V. From my measurements, when the GC2's are at 14.4V the SOC is 80%. I would say that's a fairly solid number; at most a couple percent off.
edit, just seeing new post. It's possible my numbers are 3% off. The Bogart manual states their efficiency number is conservative.
3.3.2
About charge efficiency (CEF) The charge efficiency of a lead acid battery is almost 100% as long as no gas generation takes place. Gassing means that part of the charge current is not transformed into chemical energy, which is stored in the plates of the battery, but is used to decompose water in to oxygen and hydrogen gas (highly explosive!). The “Amp-hours” stored in the plates can be retrieved during the next discharge, whereas the “Amp-hours” used to decompose water are lost.
That's close to what I stated. Gassing voltage is at about 14.4V. From my measurements, when the GC2's are at 14.4V the SOC is 80%. I would say that's a fairly solid number; at most a couple percent off.
edit, just seeing new post. It's possible my numbers are 3% off. The Bogart manual states their efficiency number is conservative.
