I use 2 x 100amp Renogy Chargers that are specifically set up to allow parallel charging up to 200amp - its a particular model, not crazy expensive and I wanted to have the back up of at least 100amp charge if one died. Regards my float volts, during charge with a 30 amp charger I can get the boost voltage at circa 14.7 then it equalises to 13.50V, switch off the charger, disconnect the earth and within 4 hrs its floating at 13.35. Have tried individual batteries on chargers up to 120amps, same result, float is 13.35V All good for me, spectacular performance compared to AGM which were 3 times the weight and half the usable capacity. The bank size is 400amp, being 4 x 100, bought this specific model of battery for the drawdown peak to allow running of a 10KW 12/240 inverter to run a mig welder - works faultlessly. My alternator is 300amp rated 100% duty cycle but most I have seen it pump out is 190amps. I had to upgrade cables etc and also have the cables punning a selective parallel route, so primary cables to the 100amp charge controllers and then a second direct cable runs to the batterie via a marine selector switch, so I can punch in more if required as the batteries can accept up to 250amps if required, nominal charge rated at 120amps. AS usual cables galore, all fuse isolated, very busy, but all works with reliability.Originally Posted by pollenface
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