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<blockquote data-quote="devin171moto" data-source="post: 8697252" data-attributes="member: 679009">Im currrently planning an uprade from my 500 w rms rockford p1 enclosure to something like 2 sundown SA- 12&#039;s or similar. in a 2003 gmc envoythe sa&#039;s would be 1500 rms together and figuring in 125 w rms x 4 for components i would be at 2000w rms. (2500 w draw accounting for efficency, d class amps)my question is.... do i need an alternator?? orr no? stock alt on gmc envoy is 150 ampsand i was ether gonna go with 1 xs power agm d3400or 1 <a href="https://www.batteriesplus.com/productdetails/battery/sli/bci-group-34_78/sli78dtagm" target="_blank">Duracell Ultra Platinum AGM Battery with Dual Terminals for BCI Group 34/78 SLI</a>&nbsp; to replace stock battery,and Duracell Ultra BCI Group 27M Deep Cycle Marine &amp; RV Battery as a secondary.&nbsp; what do you guys think? im kinda lost here. have no idea where to goamperage draw for 2500w from battery is 180A.</blockquote>

[QUOTE="devin171moto, post: 8697252, member: 679009"] Im currrently planning an uprade from my 500 w rms rockford p1 enclosure to something like 2 sundown SA- 12's or similar. in a 2003 gmc envoy the sa's would be 1500 rms together and figuring in 125 w rms x 4 for components i would be at 2000w rms. (2500 w draw accounting for efficency, d class amps) my question is.... do i need an alternator?? orr no? stock alt on gmc envoy is 150 amps and i was ether gonna go with 1 xs power agm d3400 or 1 [URL='https://www.batteriesplus.com/productdetails/battery/sli/bci-group-34_78/sli78dtagm']Duracell Ultra Platinum AGM Battery with Dual Terminals for BCI Group 34/78 SLI[/URL] to replace stock battery,and Duracell Ultra BCI Group 27M Deep Cycle Marine & RV Battery as a secondary. what do you guys think? im kinda lost here. have no idea where to go amperage draw for 2500w from battery is 180A. [/QUOTE]

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