MIKE-2U Posted July 10, 2012 Report Share Posted July 10, 2012 So i am strengthing my electrical system and need some knowledge. I have an aq 3500.1 at .5 ohms. I am picking up a d3400 under my hood tonight. I also have a singer 250 alt and all 1/0. I know i need battery (s) in back but how many and which size. Also whats the equations to figure out how big alt you need and how much battery amps you need ? Quote 2006 Jeep Grand Cherokee LaredoPioneer AVH- 3200DVD2/0 Flex-A-Prene Welding Cable (2) Fully Loaded Fi Sp4's dual 1-------> My YouTube Channel <------- Needs more power those woofers will laugh at that turd Link to comment Share on other sites More sharing options...
Born_Again Posted July 10, 2012 Report Share Posted July 10, 2012 (edited) http://www.supercirc...-Amps-Converter Edit: Is this what you're looking for? 12v x 250 amps = 3000 watts? Edited July 10, 2012 by Born_Again Quote Link to comment Share on other sites More sharing options...
MIKE-2U Posted July 10, 2012 Author Report Share Posted July 10, 2012 Lookig to see if i have enoygh alternator power and how muh battery power i need. I kniw HHR Ed has some equations not sure im mobile now so ill look when i get home Quote 2006 Jeep Grand Cherokee LaredoPioneer AVH- 3200DVD2/0 Flex-A-Prene Welding Cable (2) Fully Loaded Fi Sp4's dual 1-------> My YouTube Channel <------- Needs more power those woofers will laugh at that turd Link to comment Share on other sites More sharing options...
Watch the bass Posted July 10, 2012 Report Share Posted July 10, 2012 The only enough power is add a batt in the trunk, for a lean budget maby one of those http://www.stevemeadedesigns.com/board/topic/144556-dont-seem-like-a-bad-deal/ Quote "in the abundance of water, the fool is thirsty" Bob Marley Link to comment Share on other sites More sharing options...
Born_Again Posted July 10, 2012 Report Share Posted July 10, 2012 (edited) http://www.supercirc...-Amps-Converter Edit: Is this what you're looking for? 12v x 250 amps = 3000 watts? 500 watts are left over. We need to divide that by 12 volts and that will give us about 42 amps. If you have, lets say, an XS D3100 battery that has an amp hour rating of 110, your battery will last about two and a half hours, in theory. The harder you run your batteries, the less you'll see in a real life application. If you have a 110 amp hour battery, and you're pulling 5 amps from it, you'll probably see 110 amp hours from the battery. If you're pulling 90 amps from a 110 amp battery, you won't get over an hour of time, because it's being pushed so hard. It might only give you half an hour of time. I have a thread in the XS power forum asking for these exact numbers for a D3100 but I'm still waiting for an answer, after 5 days. I'm just a newb, so someone please correct me if I'm wrong. OP, I'm only figuring in 3500 watts of power for your amp (I don't even really know what it's putting out). EDIT: To clarify amp hours Edited July 11, 2012 by Born_Again Quote Link to comment Share on other sites More sharing options...
ch0sen Posted July 10, 2012 Report Share Posted July 10, 2012 you need to know how efficient that aq is at .5 ohm 14volts x 250 amps = 3500 watts but that aq is prb only 50-60 % efficient at .5 ohm so your back down to around 1800 watts so 1800 watts / 12 volts, since your alt isn't keeping up we will say 12, plus its always better to have extra so 1800/12=150 amps you need to make up with batteries Quote My current 95 Jetta Build w/ pioneer h/u 2 RD Sonance 10's with flatwind coils 2 Audiopipe apsm 1500.1s 1 Hifonics Brutus Elite 60x4 1 XS d925 1 Stinger spv35 1 1000 amp lead acid 50 ft of 0/1 ofc from Audiotechnix all powerbass components, and coaxils, 4 sets buildlog = http://www.stevemead...2-rd-10s-build/ My build for my wife. http://www.stevemead...01-f-150-build/ Link to comment Share on other sites More sharing options...
ch0sen Posted July 10, 2012 Report Share Posted July 10, 2012 more or less watts=volts x amps Amp efficiency means how many of those amps the amp can actually turn into watts Quote My current 95 Jetta Build w/ pioneer h/u 2 RD Sonance 10's with flatwind coils 2 Audiopipe apsm 1500.1s 1 Hifonics Brutus Elite 60x4 1 XS d925 1 Stinger spv35 1 1000 amp lead acid 50 ft of 0/1 ofc from Audiotechnix all powerbass components, and coaxils, 4 sets buildlog = http://www.stevemead...2-rd-10s-build/ My build for my wife. http://www.stevemead...01-f-150-build/ Link to comment Share on other sites More sharing options...
Born_Again Posted July 10, 2012 Report Share Posted July 10, 2012 you need to know how efficient that aq is at .5 ohm 14volts x 250 amps = 3500 watts but that aq is prb only 50-60 % efficient at .5 ohm so your back down to around 1800 watts so 1800 watts / 12 volts, since your alt isn't keeping up we will say 12, plus its always better to have extra so 1800/12=150 amps you need to make up with batteries OK, you lost me. How is his alt not keeping up? His alt will provide 3000 watts. Quote Link to comment Share on other sites More sharing options...
ch0sen Posted July 10, 2012 Report Share Posted July 10, 2012 but his amp doesn't see watts, it sees amps and an amp has to work to turn those amps into watts and no amp is 100% efficient and when you lower the ohm you lower your efficiency so if you work your way down to .5 ohm your really running inefficient idk the efficiency of that aq amp but i'm sure its quite good, 50-60% is just a low number to keep his voltage up. Quote My current 95 Jetta Build w/ pioneer h/u 2 RD Sonance 10's with flatwind coils 2 Audiopipe apsm 1500.1s 1 Hifonics Brutus Elite 60x4 1 XS d925 1 Stinger spv35 1 1000 amp lead acid 50 ft of 0/1 ofc from Audiotechnix all powerbass components, and coaxils, 4 sets buildlog = http://www.stevemead...2-rd-10s-build/ My build for my wife. http://www.stevemead...01-f-150-build/ Link to comment Share on other sites More sharing options...
Born_Again Posted July 10, 2012 Report Share Posted July 10, 2012 but his amp doesn't see watts, it sees amps and an amp has to work to turn those amps into watts and no amp is 100% efficient and when you lower the ohm you lower your efficiency so if you work your way down to .5 ohm your really running inefficient idk the efficiency of that aq amp but i'm sure its quite good, 50-60% is just a low number to keep his voltage up. OK, so the amp is pulling 3500 watts, but actually converting maybe 2000 watts of it? But it's using 290 amps? Or is the inefficency making it pull only 180 or something amps? Either way, I don't see how there is a loss of 100+ amps figuring in only this amp, or am I missing something? I'm not arguing with you, I just want to understand. Thanks dude. Quote Link to comment Share on other sites More sharing options...
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