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Old 14-12-2015, 14:39   #1
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Bringing batteries down

There has been discussion on the carbon batteries and it was stated that discharging and recharging (both fully) twice would bring the batteries back up to 100% .
My question is how would you discharge the batteries full enough and in a time period that did not require you to be in a marina for several days Can you discharge to quickly?
Assume I know to flip the breakers on the solar panel and not turn the charger on.
also what voltage is considered discharged
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Old 14-12-2015, 15:57   #2
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Re: Bringing batteries down

The easiest way to discharge is a heater hooked to an inverter. Probably best to keep the rate below C/10, so you should plan on half a day for each discharge.
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Old 14-12-2015, 16:15   #3
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Re: Bringing batteries down

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Originally Posted by donradcliffe View Post
The easiest way to discharge is a heater hooked to an inverter. Probably best to keep the rate below C/10, so you should plan on half a day for each discharge.
That is a good idea I have an inverter. What does C/10 mean I asumme it is rate of discharge. FYI the bank capacity is 525 amp hours
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Old 15-12-2015, 10:36   #4
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Re: Bringing batteries down

C is simply the capacity of the bank--in your case C/10 would be a discharge rate that would drain your bank in 10 hours. In your case, that would be about 50 amps, which could be achieved with a 500 watt load.

The amp-hrs ratings for most batteries are determined at C/20 discharge, or roughly 250 watts in your case. If you have the time, you could do a C/20 discharge and see how well your bank is holding up compared to its specs.

Due to Peukert's effect, your batteries will not deliver as many amp-hours at the C/10 rate as they will at the C/20 rate.
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Old 15-12-2015, 17:34   #5
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Re: Bringing batteries down

donradcliffe thanks for explaining that. I just read how to set set up your Battery monitor on the carbon thread . Maybe i should have taken up walking
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Old 16-12-2015, 01:26   #6
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Re: Bringing batteries down

Would you take the batteries down to 50%, or down to 0% ?
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