BEEMDUB Posted August 1, 2012 Report Share Posted August 1, 2012 I have a 200 amp pac relay and I'm currently not using it...I have 2 batteries in my car, 1 is the stock and the other is a 130ah agm battery (basically a rebranded hc2400)..I noticed that the standing voltage is getting gradually lower on the agm...Should I install the relay? Quote Link to comment Share on other sites More sharing options...
Guest Posted August 1, 2012 Report Share Posted August 1, 2012 lol dont bother. its resting lower most likely because the wet cell has a lower resting voltage than the agm battery. so the agm has to "charge" the wet cell while the car is off. equalizing the voltages, which would make the agm voltage lower and the wet cell voltage a tad higher Quote Link to comment Share on other sites More sharing options...
BEEMDUB Posted August 1, 2012 Author Report Share Posted August 1, 2012 lol dont bother. its resting lower most likely because the wet cell has a lower resting voltage than the agm battery. so the agm has to "charge" the wet cell while the car is off. equalizing the voltages, which would make the agm voltage lower and the wet cell voltage a tad higher doesn't this harm the agm over time though? And if so wouldn't the relay help protect the agm while the car is off? Quote Link to comment Share on other sites More sharing options...
c.director Posted August 1, 2012 Report Share Posted August 1, 2012 lol dont bother. its resting lower most likely because the wet cell has a lower resting voltage than the agm battery. so the agm has to "charge" the wet cell while the car is off. equalizing the voltages, which would make the agm voltage lower and the wet cell voltage a tad higher doesn't this harm the agm over time though? And if so wouldn't the relay help protect the agm while the car is off? Idk the exact relay your referring too but yes Quote Facebook: http://www.facebook.com/caleb.arnold.9809 YouTube: http://www.youtube.com/user/CustomAudioChannel?feature=watch Link to comment Share on other sites More sharing options...
BEEMDUB Posted August 1, 2012 Author Report Share Posted August 1, 2012 lol dont bother. its resting lower most likely because the wet cell has a lower resting voltage than the agm battery. so the agm has to "charge" the wet cell while the car is off. equalizing the voltages, which would make the agm voltage lower and the wet cell voltage a tad higher doesn't this harm the agm over time though? And if so wouldn't the relay help protect the agm while the car is off? Idk the exact relay your referring too but yes This is it Quote Link to comment Share on other sites More sharing options...
Guest Posted August 1, 2012 Report Share Posted August 1, 2012 its gonna put a hell of a lot of stress on your alt, and your amps. i'll tell you that much. Quote Link to comment Share on other sites More sharing options...
BEEMDUB Posted August 1, 2012 Author Report Share Posted August 1, 2012 its gonna put a hell of a lot of stress on your alt, and your amps. i'll tell you that much. So basically there is no way to run my stock and agm battery without them going bad down the road.. Quote Link to comment Share on other sites More sharing options...
c.director Posted August 1, 2012 Report Share Posted August 1, 2012 its gonna put a hell of a lot of stress on your alt, and your amps. i'll tell you that much. Whats the reason behind this? Quote Facebook: http://www.facebook.com/caleb.arnold.9809 YouTube: http://www.youtube.com/user/CustomAudioChannel?feature=watch Link to comment Share on other sites More sharing options...
Guest Posted August 1, 2012 Report Share Posted August 1, 2012 its gonna put a hell of a lot of stress on your alt, and your amps. i'll tell you that much. Whats the reason behind this? isolator cuts the rear battery off from getting charged from the alt. so the voltage is going to be at like 12.8 and drop from there. once the voltage drops enough, something like in the 10's and low 11's, the isolator will switch so that the rear battery will be charging now. alts HATE charging dead batteries. it puts a shit ton of stress on them, since they're made to keep an already charged battery charged. Quote Link to comment Share on other sites More sharing options...
graham0599 Posted August 1, 2012 Report Share Posted August 1, 2012 Just charge both batteries on a sloooowwww charge to get the resting voltages equal. The closer to 13 volts the better. Quote My 350z build- http://www.stevemeadedesigns.com/board/topic/174424-2008-350z-build/page-2?hl=%2B350z+%2Bbuild#entry2605678 Link to comment Share on other sites More sharing options...
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