wanting to keep stock alt so how many batts.

[Slawsen]

I always thought mixing batteries was a bad idea?

Apparently mixing agm and wet cells is bad. Which is why you just replace the wet cell up front with an agm battery before you just "add one to the back".

[merk_master]

Oh I always thought you wanted matched CCA for batteries

[sayhuh?]

One way to figure this out is look at your fuses on your amps. add that up and see what it comes out too, then think about how much your heat, a/c, lights, etc use and add that to what your amps draw. Think your alt can keep it all charged?

[merk_master]

I figure my 75% of my alt is used from factory. Then i used the formula 1900/.7/14.4=(x)/.5 = amps needed, Then subtract Alternator amps. gives me needed draw.

Would it be basically the same to do one large battery instead of 2? like a Hc2400?

Edited October 25, 2010 by merk_master

[sayhuh?]

One hc2000 is enough if want to go batts only.

[dugee81]

Additional batteries pose more of a load on the alt, give or take ~10 amps.

I had a HC1400 under the hood and 2 hc800's in the rear, some songs would drop me down to the mid 12's. Got rid of my 1400 and now jus have an 800 under the hood and 800 in the back, and I stay around 13.8 on all songs. lowest I've seen was 13.1 for a split second

[MECHMAN]

XS power D3100 in the trunk. DONE.

[Boon]

Stock electrical, unless you wanna bang on it for ages with the engine off.

You're talking about a realistic load of maybe 60A.