![]() This greatly helps with overall cycle life of the battery bank in my case. Given my specific battery type, I avoid discharging them further than 30% off the top (30% DOD or depth of discharge). These parameters vary quite a bit depending on the specific battery type / chemistry which I won’t get into here. The deeper you regularly discharge them, the sooner they’ll die off. Although more specifically they are AGM (Absorbent (or Absorbed) Glass Mat (or Material)) so I can keep them indoors without off-gassing.Īll batteries have a cycle life versus depth-of-discharge curve. I sketched out a simple block diagram to illustrate my battery bank: So that made 6 x 4800 = 28800 or 28.8 kWh of stored energy. Then I wired all six of those strings in parallel with each other. I put together 6 strings of 4 batteries in series. So that string provides 48 x 100 = 4800 or 4.8 kWh of energy. To get to 48 volts, I strung (connected) four batteries in series. So this one battery will provide 12 x 100 = 1200 Watt hours. But I’m not getting into that sort of detail with this general principle.) (Well, technically a fully charged 12-volt battery while at rest, no load, would be 12.7 volts. Depends how you look at it… You get the picture? What about the Amp hour rating? Put simply, you might say that this battery (if drained down to ‘dead’) will provide 1 amp for 100 hours. My batteries are 12 volts each and rated for 100 Ah each (amp hours). Instead, I’m going to use 12-volt batteries in this example because that’s what I used on this particular battery bank. So, there are all sorts of battery types and voltage configurations. ![]() Why 48 volts? Because it’s more efficient (than say, 12 volts), less loss, less current, and most off-grid inverters like to chew on 48 volts… I utilize an approximate 4000 watt solar panel array to recharge by way of a charge controller followed by a DC > AC inverter system. My objective was to put together a 48 volt battery bank (this is DC volts we’re talking about) with enough Watt hours (kWh – kilowatt hours) of energy storage to at least operate my essential systems for a few days before requiring recharge. ![]() Maybe it will provide some insight for your own alternative energy battery bank one day. But this will provide a quick overview to figure it out. I’m not going to get into the little details and caveats. I will use my own off-grid battery bank for this example how to calculate its total Amp hours and Watt hours. ![]()
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