What size battery for 2500watts

[LosIsATool 5,000+ posts]

What he said. The amp at 2 was over 80% eff. the amp at 1 is way less. Pulling more current to make the same power

 

[LosIsATool 5,000+ posts]

So I would be okay with a 3100 and an alternator that idles at 100amps and peaks at 200amps or what would the rating need to be? Sorry about all the questions, haven't had to worry about this issue yet.

Yes if you have the battery reserve to handle the peaks

 

[stephens30228 10+ year member]

I found DB Electrical - ALTERNATOR HIGH OUTPUT 220 Amp 4.0L RANGER 07 08 09 / EXPLORER 04-07 this one will fit, but I don't know the company and I don't have $400 to drop into the alternator and then another $200 or more on the battery.

 

[07denali 10+ year member]

Why don't you start with a Big 3 upgrade first and a larger primary battery and see how that works. If it still runs hot, add a second batt. If that doesn't solve it, then get an alt. No sense in spending big money an on alt from the get go when you have cheaper solutions you should try first. Get a volt meter for $25 and watch your voltage to see how that is doing as well.

 

[Joseph7195 10+ year member]

I was running 2500-3000 watts with a previous set-up and had a 140 amp alt and a batcap 2000 and I was running just fine for daily on music. I would have voltage drop when I was burping in competition, but never really any problems on music. @07denali has a good idea with starting at the basics first. Do the big 3 and see how she plays. Could you perhaps take a picture of your ground for your sub amp? I have a feeling it's probably grounded to your body instead of your frame. If you want you can PM me, I love to help!

 

[stephens30228 10+ year member]

Would running 2 Deka 9a31s be okay on a 130 amp alternator with a stock front battery? I am working on doing upgrades slowly but I don't want to screw up anything.

 

[bgowdy 5,000+ posts]

130 amps is all the alternator I have, and wife is complaining about how much I am already spending so I am trying to go the cheapest route.

this this THIS......LMFAO... sounds like my wife. i snuck and bought a 220a alt.... she has no clue lol

 

[Radiospank 10+ year member]

foreals my wife can spend like it's water, but me it's like a canteen in the desert, got to conserve and ****

 

[bgowdy 5,000+ posts]

also i wasnt going to chime in but some one did.... lol.... i was running a 2200rms @ 1 ohm on a stock 100a alt & 2 sh1ty batteries. neither amp nor sub got hot. been running it that way since i got this blazer. you alt is bigger then mine so i dont see why you wouldnt be ok with doing a big 3 and just add that xsd3100 or whatever in the back and leave your stock batt up front. .. but thats just IMO.

 

[stephens30228 10+ year member]

also i wasnt going to chime in but some one did.... lol.... i was running a 2200rms @ 1 ohm on a stock 100a alt & 2 sh1ty batteries. neither amp nor sub got hot. been running it that way since i got this blazer. you alt is bigger then mine so i dont see why you wouldnt be ok with doing a big 3 and just add that xsd3100 or whatever in the back and leave your stock batt up front. .. but thats just IMO.

Thanks, this sounds like what I was hoping for, I know that I tested my voltage and it dropped to 11.1 on real low drops.

 

[bgowdy 5,000+ posts]

foreals my wife can spend like it's water, but me it's like a canteen in the desert, got to conserve and ****

i know the feeling lol

 

[bgowdy 5,000+ posts]

Thanks, this sounds like what I was hoping for, I know that I tested my voltage and it dropped to 11.1 on real low drops.

mine stayed above 12.5 most of the time at idle with 1/2 gain, i usually dont run it full tilt less im at a comp. daily i dont go over 1/2 gain but none the less it was still a stock alt. with system full tilt & enigine at 2k rpms im usually at about 12.7 -12.9 the lowest ive seen is 11.9v and that was with truck at idle on a really hard hitting note. just make sure you watch your voltage. i have a digi voltmeter wired at amp so ill know what the amp is seeing. i havnt installed the new alt yet but i should see VERY little volt drop with it. but for you, it should be fine. i dont see it dropping to 11.1 any more.