Guest Posted December 11, 2014 Report Share Posted December 11, 2014 no one is saying to get more batteries and run stock alt. we all agree with new amp and upgraded batteries.. and again they don't have to be XS power batteries. plus current is drawn from the path of least resistance so most likely it will pull most amperage from rear battery and the alt will supply the amperage to keep that battery at the voltage the regulator is set to 2 agm batteries will be more than enough no matter the brand Very close my friend Current flows through the path of least resistance it isn't drawn from that source. When we talk path of least resistance we are talking about things like deciding "do I fround my rear batteries to the frame or to the front battery" etc. Voltage is supplied first by the source with the greatest voltage. This isnt realistic, but just to paint a picture, vision this...... - An amp that has a safe operating range of 12 - 16 V - You have a 12V battery with huge storage capacity, lets say a D7500 12 inches away from the amp connected with 2/0 wire - Also connected to the amp you have 20 feet of 1/0 wire with 2 of those batteries connected in series so here you have a 24V power source, which is above the amps safe operating voltage Now, what is the path of least resistance? The single 12V battery right? So since it is closer, do you think the amp is safe because it is harder for the 24V to get to the amp? Save your money for a 2nd battery, buy a good alternator and you're golden. If I buy the XS power battery for the front and get the 240amp alt and have no issues, I wouldnt really need a second battery though unless I wanted to play music with just the batts. Don't forget that your vehicle needs some of your alt's output also. That's why in my first post i asked you what your oem alt was rated at. You dont NEED to upgrade your battery, but it could help going from OEM to something like an XS. Also, remember with aftermarket alternators there are alot of them that over promise and under deliver. Which is why I am opting to go with a mechman alt as they seem to have up spec reviews across the board. Link to comment Share on other sites More sharing options...
rockFord_Expedition Posted December 11, 2014 Report Share Posted December 11, 2014 Double post Old School/New School RF Build March 2015 SOTM Winner How to crimp large wire Link to comment Share on other sites More sharing options...
Miguels Posted December 11, 2014 Report Share Posted December 11, 2014 then why do we have to charge our batteries weekly? if alt is what feeds the amplifiers then the battery wouldn't need to be charged you know since current flows right through the battery and to the amps.. that is not the case. batteries still get drained even if your voltage dont get lower than 13.8 and have beast alts. that proves energy is being sucked out of the batteries. i understand where are you coming from and where you got your info but the fact is even if you have overkill alternator batteries still get drained and need to get charged my logshttp://www.stevemead...-my-new-set-up/my blow through loghttp://www.stevemead...future-updates/ 96 ss http://www.stevemeadedesigns.com/board/topic/164094-96-impala-ss-build/ Link to comment Share on other sites More sharing options...
rockFord_Expedition Posted December 11, 2014 Report Share Posted December 11, 2014 always match the batterys..... you could get away without it..... i'm a keen believer in overkill for all my electrical. cant hurt having the extra batt in there Yes it can So if I did have to end up buying a second battery, would you recommend a smaller, larger or identical battery for the rear? Neither because with solid electrical (alternator and wiring etc.) it isn't going to help your system. Old School/New School RF Build March 2015 SOTM Winner How to crimp large wire Link to comment Share on other sites More sharing options...
rockFord_Expedition Posted December 11, 2014 Report Share Posted December 11, 2014 That's hardly a correct comparison.What are you referencing?The drawing from two Batts in series vs. An alt and 12v batt. I said it was unrealistic, I was trying to provide an example of voltage being provided by the source of highest voltage and not being provided by the path of least resistance as suggested by the post I quoted, Read the quoted post as well as my response. Old School/New School RF Build March 2015 SOTM Winner How to crimp large wire Link to comment Share on other sites More sharing options...
Guest Posted December 11, 2014 Report Share Posted December 11, 2014 always match the batterys..... you could get away without it..... i'm a keen believer in overkill for all my electrical. cant hurt having the extra batt in there Yes it can So if I did have to end up buying a second battery, would you recommend a smaller, larger or identical battery for the rear? Neither because with solid electrical (alternator and wiring etc.) it isn't going to help your system. So basically, your philosophy is one battery per alternator? Or is that just what you suggest for my particular setup. And after all this, I will go ahead and get the XS Power battery and 240amp Mechman alt and call it a day. And pray I don't have voltage issues. lol Link to comment Share on other sites More sharing options...
rockFord_Expedition Posted December 11, 2014 Report Share Posted December 11, 2014 then why do we have to charge our batteries weekly? if alt is what feeds the amplifiers then the battery wouldn't need to be charged you know since current flows right through the battery and to the amps.. that is not the case. batteries still get drained even if your voltage dont get lower than 13.8 and have beast alts. that proves energy is being sucked out of the batteries. i understand where are you coming from and where you got your info but the fact is even if you have overkill alternator batteries still get drained and need to get charged How low does resting voltage of your batteries get that you need to charge them weekly, and to what voltage are you charging them up to? If the batteries are healthy, never see voltage below 13.8 as you stated, there is enough amperage to maintain that surface charge from the alternator and the vehicle is driven enough then you shouldn't have to top them off with a trickle charge due to them being at a lower than optimal resting voltage. If you HAVE to charge your batteries at home then one of the above stated conditions doesn't exist. Old School/New School RF Build March 2015 SOTM Winner How to crimp large wire Link to comment Share on other sites More sharing options...
rockFord_Expedition Posted December 11, 2014 Report Share Posted December 11, 2014 always match the batterys..... you could get away without it..... i'm a keen believer in overkill for all my electrical. cant hurt having the extra batt in there Yes it can So if I did have to end up buying a second battery, would you recommend a smaller, larger or identical battery for the rear? Neither because with solid electrical (alternator and wiring etc.) it isn't going to help your system. So basically, your philosophy is one battery per alternator? Or is that just what you suggest for my particular setup. And after all this, I will go ahead and get the XS Power battery and 240amp Mechman alt and call it a day. And pray I don't have voltage issues. lol No, not saying one battery per alt. I am talking about in your situation and you saying you are on a budget, your money is better spent on a good alternator. I am not sure if 240A will be adequate for you to play at full tilt with all OEM electrical running as I am not sure what your EOM alt is rated at, dont forget about your OEM components needing current. Old School/New School RF Build March 2015 SOTM Winner How to crimp large wire Link to comment Share on other sites More sharing options...
Miguels Posted December 11, 2014 Report Share Posted December 11, 2014 then why do we have to charge our batteries weekly? if alt is what feeds the amplifiers then the battery wouldn't need to be charged you know since current flows right through the battery and to the amps.. that is not the case. batteries still get drained even if your voltage dont get lower than 13.8 and have beast alts. that proves energy is being sucked out of the batteries. i understand where are you coming from and where you got your info but the fact is even if you have overkill alternator batteries still get drained and need to get charged How low does resting voltage of your batteries get that you need to charge them weekly, and to what voltage are you charging them up to? If the batteries are healthy, never see voltage below 13.8 as you stated, there is enough amperage to maintain that surface charge from the alternator and the vehicle is driven enough then you shouldn't have to top them off with a trickle charge due to them being at a lower than optimal resting voltage. If you HAVE to charge your batteries at home then one of the above stated conditions doesn't exist. why would i have to drive my car enough to keep it at 100%. as you stated all you need is the alt. shouldnt a 350a singer alt be enough to keep up with 150a draw? like i said i get what youre saying but if it is like you say why is my battery getting drained if i have enough alt to keep up with no batteries. thats what i need answered.. and no my battery is not dead. it rest at 12.8 after 2 days of sitting my logshttp://www.stevemead...-my-new-set-up/my blow through loghttp://www.stevemead...future-updates/ 96 ss http://www.stevemeadedesigns.com/board/topic/164094-96-impala-ss-build/ Link to comment Share on other sites More sharing options...
rockFord_Expedition Posted December 11, 2014 Report Share Posted December 11, 2014 4167/13.4v because its more realistic. 315a to maintain 14v only happens in the perfect world.. no one will ever see 14v unless you dont play or dont have anything on but the engine.. hot alt charges at 13.8 and even 13.4 at times and that's not counting amp playing .. just the bass will bring it down to 13.1 if he has solid electrical. But couldn't that perfect world be created? Not saying that everyone is setup like this, but it's feasible right? What if we could externally regulate our alternators to reduce the voltage drop and reinforce that with caps? We could definitely stay much closer to 14 than 13.1 couldn't we? Old School/New School RF Build March 2015 SOTM Winner How to crimp large wire Link to comment Share on other sites More sharing options...
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