Critique proposed solar battery upgrade
Currently have a Jayco hybrid (Jayfeather 26L) but moving to a Denali 5th wheel in the spring (2012 DE324LBS). Currently have 4 Trojan T125’s with 600 watts of solar, with a Kisae 2000 watt pure sine...
Forum Discussion
OldSmokey wrote:
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for example a 1000 W inverter at max load will draw approx 1100 to 1200 Watts due to inefficiencies
and at 12 volts this is 1200 / 12 = 100Amps ! if we were to do this to a T105 then the voltage drop
would be the ( internal resistance of the battery ) * 100Amps
a T105RE is 0.001 Ohms per cell so thats 0.001 * 6 ( for 12 volts ) so the Vdrop = 0.006 * 100 = 0.6 Volts
your 12 v battery is now only 11.3 volts ! add to this contact resistance and it just gets worse.
your inverter will soon trip out on a low voltage alarm.
if we had 1000 W inverter on 24 Volts you would get: 1200/24=50Amps and Vdrop is still 0.6V
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Yes, with the same watts of inverter load, we are getting about the same V drop with our 4 GC2s in series, as we were getting with them in parallel. But as that's only half the percentage V drop, we're better off. The new 24V Kisae inverter is certainly a lot happier than our old 12V inverter.
