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Old 02-03-2019, 07:30 PM   #1 (permalink)
A_G
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Need help with a on board jump system

When i was put into my 01 f550 it had two 8d batteries mounted in the back seperate from the charging system with a trickle charger mounted in one of the boxes that you would plug in at night.

It couldnt keep up with batteries and and in my infinite wisdom decided to wire it into the stock charging system, forgetting the basics of electricity.

Where as my amps are only as good as my smallest capacity (a gp65 with 875cca, where as a single 8d is good for 1400cca)



6months i cant jump shit, during a downtime for a massive oil leak i decided to dig into it. My group 65s are dead, while my 8d's are good.

I looked at a isolator but it would only solve one of my 2 issues. And the one that doesnt really matter to me.

issues:

1. separating load from stock system (what the isolator will solve)
2. separating charge from the stock system


#2 is what likely killed my stock batteries, as the two 8d batteries have a much larger capacity meaning the stock batteries would be done charging and the alternator would keep going to charge the 8d batteries over charging the stock batteries eventually smoking them, then the stock batteries would become massive resistors to the 8d system.


So i have a few solutions.

1. Delete the front batteries, run off 8d batteries only, simplest but it has some secondary issues, id haft to get some isolated studs in mount them in the stock battery location to make stock connections.

2. Add the second alt from a ambulance package. Hook up second alternator only to the 8d's . Kinda what i want to do but cant find the info or a kit, individual part numbers yes but not a kit.


3. Chunk my 6 month old 8d batteries into other vehicles (ie my 7100 service truck) change to the highest CCA group 65 batteries (found northstar agm gp65 at 1075cca)


3/4. Same as above. But add say 4 of the high amp gp 65 in place of the 8d's. Install isolator to keep the draw away from my starter batteries for the purpose of jump starting and running my inverter. (2nd best option IMO and likely most expensive)


5? I remember maybe its fuzzy not sure but i think you can hack a gp31 into a gp65 location and that would give me more cca at a lower cost than of a agm. That could be combined with option 3/4


Thoughts? Opinions?
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Old 02-04-2019, 12:32 PM   #2 (permalink)
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You need a voltage sensing isolator, it'll take care of both problems #1 and #2 by only sending charge voltage to the battery that needs it. Over voltage is what kills batteries in your scenario, the alternator is a constant voltage source. As long as it's outputting the proper voltage then none of the batteries should over charge, the alternator can make all the amps it wants and the batteries won't care as long as the voltage is correct, the voltage regulator does this automatically. I'd start with that, if the voltage is creeping up beyond the normal ~14.5-14.8v then I'd look at figuring out why.

Chances are that they way you have the batteries wired directly to the rest of the truck is what killed your starting batteries, without an isolator they need to be matched or the stronger batteries will drain the weaker batteries. An isolator should fix all your issues. The auxillary batteries won't be able to suck the life from the starting batteries and the isolator will direct charging current where it's needed.
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Old 02-04-2019, 08:32 PM   #3 (permalink)
A_G
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Quote:
Originally Posted by ironmangq View Post
You need a voltage sensing isolator, it'll take care of both problems #1 and #2 by only sending charge voltage to the battery that needs it. Over voltage is what kills batteries in your scenario, the alternator is a constant voltage source. As long as it's outputting the proper voltage then none of the batteries should over charge, the alternator can make all the amps it wants and the batteries won't care as long as the voltage is correct, the voltage regulator does this automatically. I'd start with that, if the voltage is creeping up beyond the normal ~14.5-14.8v then I'd look at figuring out why.

Chances are that they way you have the batteries wired directly to the rest of the truck is what killed your starting batteries, without an isolator they need to be matched or the stronger batteries will drain the weaker batteries. An isolator should fix all your issues. The auxillary batteries won't be able to suck the life from the starting batteries and the isolator will direct charging current where it's needed.

I know why I'm killing my batteries. The closest I can find I'm what your talking about is a acr. But in it's format it's wired as if the primary battery is the larger one.

I emailed blue sea for clarification. Thanks for the suggestion
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1967 F250: Restomod
1998 f150 reg cab, swb, 4x4 5.4
2013 Yamaha fz8
2015 jetta
And 2 more
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Old 02-12-2019, 01:23 PM   #4 (permalink)
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https://www.powerstream.com/battery-isolator.htm

My understanding of the way they work is that it doesn't matter which is the larger battery as long as they have the same charging voltage requirements. As long as they both want the same voltage the system will "protect" the primary battery and charge the auxiliary batteries once the primary reaches 13.6v with an automatic disconnect if the primary drops to 12.6v.
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