GatiBeats Posted September 26, 2013 Report Share Posted September 26, 2013 I preordered a pair of Obsidian 18 v2's a couple months ago, and they should be in within the next month, so I am looking to beef up my electrical adequately beforehand. I currently have the big 3 done in Knu 0g, an XS d3400 up front and stock 125A alt in my Grand Prix. I plan to power the Obsidians with a RF T1500bdcp @1ohm and set of Crescendo PWX 6.5's in parallel with a set of RF T2 comp's off a RF T400-2 @2ohms. Overall I will be looking at something in the neighborhood of 1900-2kw. I would like to throw an XS XP3000 in the trunk with an isolator, and naturally put off buying an expensive alt, but I wasn't sure if that would be sufficient. Any insights? 06 pontiac grand prix alpine ida x100 rf t2 comps rf t1500, t400-2 knu 0 big 3 xs d3400 oct 11 tentatively: 2 obsidian 18 v2's Link to comment Share on other sites More sharing options...
Chance_P Posted September 26, 2013 Report Share Posted September 26, 2013 Whats the difference in price between an alternator and a battery/isolator? I vote alternator. Link to comment Share on other sites More sharing options...
GatiBeats Posted September 26, 2013 Author Report Share Posted September 26, 2013 Whats the difference in price between an alternator and a battery/isolator? I vote alternator. Mechman quoted me $300 for a 170A, $400 for 240A, and $500 for 320A (S Series). The XP3000 would be $280 and the isolator about another $50. 06 pontiac grand prix alpine ida x100 rf t2 comps rf t1500, t400-2 knu 0 big 3 xs d3400 oct 11 tentatively: 2 obsidian 18 v2's Link to comment Share on other sites More sharing options...
poorfish88 Posted September 26, 2013 Report Share Posted September 26, 2013 Ditch the isolator it's not needed. If and when you install your back battery. Link to comment Share on other sites More sharing options...
Dan2427 Posted September 26, 2013 Report Share Posted September 26, 2013 No need for an isolater unless you play with the car off. Just get your xp3000 and have it paralleled with the 3400 and that would be the best. Then save for your alt. 2003 GMC Yukon Denali Alpine CDA 117 Redoing Mids/Highs 4 Runs of 1/0 Knukonceptz 2+, 2- 4 Deka 9A31's in back (Stock underhood) 250 amp Alt. AQ20K 2 18" Crossfire XS V.2's 12 cubes 33hz 149sq inches of port! Link to comment Share on other sites More sharing options...
GatiBeats Posted September 26, 2013 Author Report Share Posted September 26, 2013 No need for an isolater unless you play with the car off. Just get your xp3000 and have it paralleled with the 3400 and that would be the best. Then save for your alt. Do you think the two batteries paired with the stock alt would suffice as a daily driver (I'm not burping) for a while until I got the alt? 06 pontiac grand prix alpine ida x100 rf t2 comps rf t1500, t400-2 knu 0 big 3 xs d3400 oct 11 tentatively: 2 obsidian 18 v2's Link to comment Share on other sites More sharing options...
Dan2427 Posted September 26, 2013 Report Share Posted September 26, 2013 Yea with your two batts it would be fine. My AQ20k at 1.4 ohms and 6 batts ( 5 g31s, 1 g34) would hold 12.8 for quite some time when my rewound 250 went out and I went to a stock 160 for a couple weeks to wait for my 270 amp. I would be comfortable running those 2 on that power for a long time just watching voltage closely. 2003 GMC Yukon Denali Alpine CDA 117 Redoing Mids/Highs 4 Runs of 1/0 Knukonceptz 2+, 2- 4 Deka 9A31's in back (Stock underhood) 250 amp Alt. AQ20K 2 18" Crossfire XS V.2's 12 cubes 33hz 149sq inches of port! Link to comment Share on other sites More sharing options...
vetkilr01 Posted September 26, 2013 Report Share Posted September 26, 2013 You will be fine... Link to comment Share on other sites More sharing options...
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