Ratski Posted March 20, 2016 Report Share Posted March 20, 2016 hi i am in the middle of my big three. i have two lead acid batteries up front (diesel truck) and i have just placed two agm 92AH batteries in the bed. they are not wired yet. i am curious if i need one of those pac battery isolator to keep the lead acids seperated from the agm. or is it ok just to connect them all. i have 2 runs of 1/0 to the rear batteries one for each battery straight off the alt. but obviously both my lead acids are off the alternator as well. so thats why im curious if i need to go through an isolator of some sort Link to comment Share on other sites More sharing options...
ShadeTreeMechanic Posted March 20, 2016 Report Share Posted March 20, 2016 An AGM has different charging requirements than wet lead acid. The AGM requires a tapered charge to cut back as the voltage comes up to prevent gassing as they cannot vent they can only Absorb it into the Glass Mat that is between the plates. That being said, the alternator is not equipped to do this anyway. Ideally all would be AGM but people mix sizes and types and seem to get away with it. Maybe someone who has done this will chime in. 91 C350 Centurion conversion ( Four Door One Ton Bronco) 250A Alternator (Second Alternator Coming Soon) G65 AGM Up Front / Two G31 AGM in Back Pioneer 80PRS CT Sounds AT125.2 / CT Sounds 6.5 Strato Pro component Front Stage CT Sounds AT125.2 / Lanzar Pro 8" coax w/compression horn tweeter Rear Fill FSD 5000D 1/2 ohm (SoundQubed 7k Coming Soon) Two HDS315 Four Qubes Each 34hz (Two HDC3.118 and New Box Coming Soon) Link to comment Share on other sites More sharing options...
Masterbasser Posted April 16, 2016 Report Share Posted April 16, 2016 curious about this myself. any reccomendations? Kenwood excelon ddx795 3 370 amp CES alternators (audio side only) McLaren dome tweeters Crescendo 6.5 ultra neos NVX JAD800.4 4 PA x4 SPL 18's 4 Digital Designs m5's at .7 ohms each 2 K2 80 ah lithiums 3 group 31 agms Ledglow million color (12 piece) 2007 Yukon xl Link to comment Share on other sites More sharing options...
ShadeTreeMechanic Posted April 16, 2016 Report Share Posted April 16, 2016 I think the resting voltage for the two types might be different. So overnight when they sit, the lower resting voltage batteries will try to pull the higher ones down. The AGM companies recommend not to do this but I'm not sure how big of a deal it is. 91 C350 Centurion conversion ( Four Door One Ton Bronco) 250A Alternator (Second Alternator Coming Soon) G65 AGM Up Front / Two G31 AGM in Back Pioneer 80PRS CT Sounds AT125.2 / CT Sounds 6.5 Strato Pro component Front Stage CT Sounds AT125.2 / Lanzar Pro 8" coax w/compression horn tweeter Rear Fill FSD 5000D 1/2 ohm (SoundQubed 7k Coming Soon) Two HDS315 Four Qubes Each 34hz (Two HDC3.118 and New Box Coming Soon) Link to comment Share on other sites More sharing options...
SkarredSierra Posted April 16, 2016 Report Share Posted April 16, 2016 Ive ran a lead acid up front and an agm in the rear for over 3 years. No problems and still runnin strong. No isolater either. Link to comment Share on other sites More sharing options...
RooTxBeeR Posted April 16, 2016 Report Share Posted April 16, 2016 The thing you need to worry about when mixing battery typed is the their resting voltages. Each sits differently. If you connect 2 battiers, and they sit forever connected, they will drain each other because they will both try to be at an equal resting voltage but they can't, so they get drained. However, if it is a daily vehicle that will be start and stopped numerous times throrought the day, you will be fine doing it. On 11/20/2012 at 8:54 PM, AMI CUSTOMS said: Turned mine up today at a light, guy next to me his steering wheel started moving and he looked over at me like I was a magician lol. On 5/9/2012 at 8:45 PM, skittlesRgood said: fuck the plating. look at what the main metal used is. you could buy unicorn blood plated terminals but if its just covering up dog shit, whats the point On 4/10/2013 at 12:26 PM, mrd6 said: I'll admit, half way through sanding that fiberglass in the rain and cold while I was all itchy I was definitely starting to question why i was doing this haha Soon To Be '04 Ford Escape US Alternator 280A Hairpin D4800 Under the Hood (6) XP3000's in Rear 1/0 SHCA & XS Power 4 runs to back TORK2 kit from Tony @ CE Auto Supply Pioneer DEH-80PRS DD AW6.5 (2) per door *Tweeter Unkown* DD SS4a & C3d (2) SCV4000 @ .5Ohm (2) 15" Sundown Zv5 Link to comment Share on other sites More sharing options...
Broke_Audio_Addict Posted April 16, 2016 Report Share Posted April 16, 2016 The thing you need to worry about when mixing battery typed is the their resting voltages. Each sits differently. If you connect 2 battiers, and they sit forever connected, they will drain each other because they will both try to be at an equal resting voltage but they can't, so they get drained. However, if it is a daily vehicle that will be start and stopped numerous times throrought the day, you will be fine doing it.All that will happen is one will get pulled down to the resting voltage of the other, they don't drain each other completely.Especially in a daily driven vehicle. That being said a lot of people's definition of "music" is a clipped 30 hz sine wave with some 80 IQ knuckle head grunting about committing crimes and his genitals. Link to comment Share on other sites More sharing options...
everybodyknowme Posted April 16, 2016 Report Share Posted April 16, 2016 I've ran both acid lead up front and agm in the rear for years. Yes it's true if you let the car sit without constantly driving more than likely the acid lead will drain. It happened to me. Went out of town for 5 days. Came home battery dead. To prevent this i did what you're thinking. Got me a 200amp stinger relay to basically disconnect between the two when the car is off. No problems since then. And it was cheaper than going to get matching agms. Link to comment Share on other sites More sharing options...
RooTxBeeR Posted April 17, 2016 Report Share Posted April 17, 2016 The thing you need to worry about when mixing battery typed is the their resting voltages. Each sits differently. If you connect 2 battiers, and they sit forever connected, they will drain each other because they will both try to be at an equal resting voltage but they can't, so they get drained. However, if it is a daily vehicle that will be start and stopped numerous times throrought the day, you will be fine doing it.All that will happen is one will get pulled down to the resting voltage of the other, they don't drain each other completely.Especially in a daily driven vehicle. As I stated, on a vehicle that sits for ever without any start ups to charge will drain. On 11/20/2012 at 8:54 PM, AMI CUSTOMS said: Turned mine up today at a light, guy next to me his steering wheel started moving and he looked over at me like I was a magician lol. On 5/9/2012 at 8:45 PM, skittlesRgood said: fuck the plating. look at what the main metal used is. you could buy unicorn blood plated terminals but if its just covering up dog shit, whats the point On 4/10/2013 at 12:26 PM, mrd6 said: I'll admit, half way through sanding that fiberglass in the rain and cold while I was all itchy I was definitely starting to question why i was doing this haha Soon To Be '04 Ford Escape US Alternator 280A Hairpin D4800 Under the Hood (6) XP3000's in Rear 1/0 SHCA & XS Power 4 runs to back TORK2 kit from Tony @ CE Auto Supply Pioneer DEH-80PRS DD AW6.5 (2) per door *Tweeter Unkown* DD SS4a & C3d (2) SCV4000 @ .5Ohm (2) 15" Sundown Zv5 Link to comment Share on other sites More sharing options...
gizmo1 Posted April 17, 2016 Report Share Posted April 17, 2016 I've read that mixing the 2 will shorten battery life. Is this not the case in a daily driver? Link to comment Share on other sites More sharing options...
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