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Old 01-05-2017, 12:48 AM   #5
gmc
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Brand: Thor Motor Coach
Model: Hurricane 32A
State: Florida
Posts: 1,873
THOR #2829
Quote:
Originally Posted by toolman View Post
The 2 batteries are with no name but I believe they are 20 AH 12V Flooded 12 V made by Exide J16. A label on them has 27MDP. I googled this # and I came up with these specs that I listed.
My four new Batteries are Trojan 30XHS 12V C-16 130AH at 20Hrs or 105AH at 5Hr.
Well - that will be a significant upgrade in capacity...
The Trojan 30XHS shows to be a flooded deep cycle - so the on board converter is usable without damaging the new batteries...
But a much larger capacity - it may take a longggg time to charge. See what the output of the converter is - may be worth an upgrade as well.

I would not ADD the batteries to the current 2 - but replace them (assuming you can fit all four... even 2 of those would be a good upgrade). They will not be happy together (the lower capacity batteries will get severely overcharged while charging the larger ones...) Batteries joined in series or parallel should be matched in capacity and age.

They should be wired with short leads between the batteries - with the positive take off at one end of the bank and negative at the other. The intent to balance the load ACROSS the bank... (drawing all from one side will have more power drawn from the first battery... and less from each as you go down the line (electricity always follows path of least resistance...)
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Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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