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Battery isolator for 150 HPDI

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leg01as

New member
"Hi,
I currently have 3 batte

"Hi,
I currently have 3 batteries that I would like to charge through the alternator. I am considering purchasing a battery isolator for 3 batt w/1 alt. My question is, the isolator come in different amps, what amps should my isolotor be for an HPDI 150? Does anyone have this type of setup? To throw a kink into things, I have a a/b/all/off switch connected.

Thanks."
 
"The switch is irrelevant prov

"The switch is irrelevant provided you have circuit protected charge leads going directly to each battery from the isolator output circuits.

I would verify the alternator output with the engine manufacturer but I would think 50 amps would be more than adequate. If not, they come in 70 and 100 as well and the price is not much more for the larger units."
 
"download the owners manual fr

"download the owners manual from yamaha, if u alredy do not have it. it will tell u how many amps it puts out"
 
"I have 3 batteries on mine al

"I have 3 batteries on mine also, and use to have the same switch as you do, #1 is start, #2 is house/trolling boost, #3 is trolling 24V, if you have this setup just remember #2 and #3 are setup in series (24V)when you plug in your trolling motor plug. Took me awhile to figure out how they set it up and why I could not charge all the batteries while on water, needless to say I always forgot to change the switch to #2 so in the end of the day I had 2 dead batteries.

Remember, if you have a 24V TM you can't just throw another common Ground wire between #2 and #3 making it a one big 12V bank, even with VSR or Yamaha Isolator cable."
 
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