Question about HQRP 20A Solar Panel Battery Charge Controller / Regulator 12V / 2

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How low can I safely and repeatedly discharge the THUNDERBOLT MAGNUM SOLAR 12 Volt, 35 Amp Hour Universal Battery?

I have read blogs that say 50% although that varies but most often I see down to 11.9volts only which is not near the 6.5 Volts which I was expecting due to the rating of AGM batteries saying 50% was acceptable.

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Can a 33amp hour battery be used in a mpv5hoveround


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I have a 3/4 hp hayward pumping thru solar panels, too. 1-1/2 discharge thru 50 ft of 2inch pipe, up 12 ft then thru (4) 4x12 panels. Mine is on 115 volts ac.
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What size wire is running the 60 ft to the pump?

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Hi.Sounds like your batteries have sulphated plates, this happens when they sit for too long without being used. Your machine is a 24 volt system, so it needs both batteries to be working.You might be able to get a bit more life out of the batteries.
Try removing both batteries from the machine and connecting a light bulb across each battery and discharging them until they are flat.
Then using a 12 volt charger, ( not the charger for the machine, which is a 24 volt charger ), charge the 2 batteries in parallel. Sometimes it helps to charge them up the wrong way for a few hours, then discharge them again with the light bulbs. After this charge them again in parallel with the 12 volt charger, this time the correct polarity, a leave on charge for 12 hours.
You might have to repeat the charge, discharge cycle a few times.
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