Running multiple batteries?

[Anonymous 10+ year member]

I have heard so many different things from different people regarding this issue. Some people say that you need a relay or isolator because the batteries will drain from each other and other people say that you don't need to run a relay or isolator just run all the batts in parallel. Which method is correct?

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[PV Audio 5,000+ posts]

Posting in the correct forum is correct. This is the box building forum, the electrical forum is one above this. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[x1le 10+ year member]

I'm no expert on this, but it depends on the battery. If you are running all deep cycle batterys, running them in parallel is fine. But if you are mixing and matching, use an isolator.

 

[psychoacoustics 10+ year member]

this is true

dont mix and match batteries

parasitic discharge is what is happening they will try to equalize back and forth until they are both dead

its not as big of a deal for a competiton car cuz they sit on a charger most of the time.

if you drive the car and need it to be dependable its more of an issue.

if you plan on listening to the stereo for long times and dont plan on starting the car (at the park or a show) an isolator will isolate the starting battery from the stereo battery until the alternator is charging

by batteries from the same place at the same time

all batteries should be wired in parallel if not you will get 24 volts

 

[Anonymous 10+ year member]

My bad I thouught this was the electrical forum my bad. But yes they are all deep cycle in the back and a normal batt up front.