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ntrikit
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36 Posts

Posted - 05/03/2006 :  12:30:57  Show Profile  Visit ntrikit's Homepage  Send ntrikit a Yahoo! Message
I just installed the 18V setup from Gruber Power. I have an automotive battery charger. It has 6V 6 amp, 12V 6 amp, and 12V 12 amp. Is 6 amps too much for the Gruber batteries? If it's ok, how long should I let the charger connected for?

jasncab
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Phoenix
AZ
USA



1119 Posts

Posted - 05/03/2006 :  12:43:19  Show Profile  Visit jasncab's Homepage
I am pretty sure 6 amps is too much - based on what Chris at Gruber told me....

I picked up the following charger at walmart for $17.. Charges both 6V and 12V at 1.5 amps.
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ntrikit
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36 Posts

Posted - 05/03/2006 :  15:29:18  Show Profile  Visit ntrikit's Homepage  Send ntrikit a Yahoo! Message
I came across a 12V 2amp charger. How long should I let the battery on the 2am charger? I am just charging the 12V Gruber battery, not the 6 and not both at once.
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jasncab
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Phoenix
AZ
USA



1119 Posts

Posted - 05/03/2006 :  16:16:29  Show Profile  Visit jasncab's Homepage
quote:
Originally posted by ntrikit

I came across a 12V 2amp charger. How long should I let the battery on the 2am charger? I am just charging the 12V Gruber battery, not the 6 and not both at once.



12V 12AH could be charged at 2amps for 6-8 hours.

You can go to c/4 if you want, but I wouldnt
(12AH at 3 amps for 4-6 hours)

I would set a timer. I used a christmas light timer. Turned it on checked the time and hooked an off switch (those little tabs you put in it) to 8 hours from now... That way in 8 hours it turns off and take manual intervention to turn back on.

Check the voltage under load as well. a fully charged 12V battery should put out 12.7V under load. So hook up a DMM to the wires from the batt, press the gas for 3 - 4 seconds and record the lowest setting. Is it below 12.3V? Charge some more.

a 12V battery is dead at 10.5V using the above test.

I like the following information (site noted below)
State of Charge 12 Volt battery Volts per Cell
100% 12.7 2.12
90% 12.5 2.08
80% 12.42 2.07
70% 12.32 2.05
60% 12.20 2.03
50% 12.06 2.01
40% 11.9 1.98
30% 11.75 1.96
20% 11.58 1.93
10% 11.31 1.89
0 10.5 1.75

http://www.windsun.com/Batteries/Battery_FAQ.htm#Battery%20Charging
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