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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If it is a 12 volt Size U1 - yes. (UB12350, GPC1234, GPL-U1, NP33-12B)
The amp hour rating is dependent on use and manufacturer of the battery. It is the size and voltage that matters. AGM batteries generally have a slightly lower AH rating but recover better from deep deep discharging cycles. (Available at marine stores)
The amp-hour rating affects how long the chair will travel between chargings.
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.
You have plenty of pump and when you run a pump with low flow, amperage is low. You are not tripping your breakers, it sounds like the pump is overheating. Is it hot to the touch when it shuts down?
Do you have an ammeter so you could check your amps?
What size wire is running the 60 ft to the pump?
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.
The batteries will accept a charge after a bit of this, but they might not be as good as new batteries.
If you are unsure how to do this, get some help from someone who can do the work safely.
Good luck. Neil.