Nealon14 Posted August 25, 2014 Report Share Posted August 25, 2014 (edited) Hey guys Iam planning on buying a xs power d5100r for my primary battery up front, but I am puzzled on the secondary battery for the back. I was thinking about a d975 or an xp975. What would I benefit from either? I know the xp975 has reserve power but doesn't the d975 have that as well? I am running about 2.5k RMS give or take. Can anyone help me out here if anyone has any other suggestions they will be appreciated. I have a stock alt btw Edited August 25, 2014 by Nealon14 Quote Link to comment Share on other sites More sharing options...
moredbs Posted August 25, 2014 Report Share Posted August 25, 2014 what 2.5k amp? what vehicle and output of stock alt? if its a true 2.5k amp your gonna need a bigger battery and possibly a bigger alternator. Quote Link to comment Share on other sites More sharing options...
Nealon14 Posted August 25, 2014 Author Report Share Posted August 25, 2014 (edited) i have a ct sounds 1400.1 and getting a 125.4, so im guessing its around 2.5k rms total between both of my amps. I have a nissan versa 2012 sedan and i have no idea what the alt outputs. I should i mentioned that sorry. The largest battery i can fit up front is a group 51 according to the xs power website. i also took the measurements and it seems right. since i am going to need a bigger alt and stuff i would be better off getting the d975 instead of the xp975 for the rear? Edited August 25, 2014 by Nealon14 Quote Link to comment Share on other sites More sharing options...
moredbs Posted August 25, 2014 Report Share Posted August 25, 2014 you will probably get away with 975 either series, depending on your stock alt,and if you've done the big three. Quote Link to comment Share on other sites More sharing options...
Nealon14 Posted August 25, 2014 Author Report Share Posted August 25, 2014 (edited) yeah i got the big 3 done. i have one more question would i need to get a charger for the rear battery or will it charge fine from the alternator through the front battery? ill prolly just buy the xp975 then since its a little bit cheaper . Edited August 25, 2014 by Nealon14 Quote Link to comment Share on other sites More sharing options...
moredbs Posted August 25, 2014 Report Share Posted August 25, 2014 alternator will charge it. Quote Link to comment Share on other sites More sharing options...
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