I have what I thought was a straight forward Victron Easysolar 2GX system. I have connected to it eight XL31S 130Ah Hankook calcium based batteries configured as 4 parallel strings of two batteries in series.
I was under the impression that I would have a resultant power bank of 24v at 520Ah?
Perhaps I'm wrong in my theory, since without any mains power connected, they only last around 6hrs while discharged to 50 % (24.2v). The discharge current averages at around 15amps (between 10 and 18amps nominal). This is following a full cycle recharge until the batteries reach the float stage for several hours.
Where have I gone wrong with my calculations as I estimated they should last more like 20hrs down to a 50% discharge – and not a maximum of 6hrs as I am getting? I don't understand why its such a short time.
All 8 batteries are brand new in the last month.