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diy solar

Should 2 Epoch 12v 460Ah essentials have the same V and Amp draw when in parallel?

Captn.Dwight

New Member
Joined
Nov 1, 2024
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2
Location
Hereford, AZ
I purchased two Epoch 12v 460Ah essentials and connected them in "parallel bus" configuration to a Victron 1000 A smart shunt and on to a Victron Multi-plus II 12/120.
[I say "Bus" because I used exactly the same cable lengths for connecting each battery to the main cables that run to the inverter.]
I'm observing that under a 130A load, these two batteries are not behaving as equals. While under this 130A load, one is 1/2 a volt lower and 1/2 an amp lower than the other.
After working under this load for two hours, these two batteries are substantially different in their self-reported state of discharge (which is what I would expect if they are not providing equal voltage and current to the bus).
Is this normal, or do I have a defective battery? I've asked Epoch this question and they just "don't answer the question".
I've been working with 100Ah 12v batteries for about 10 years now on boats and RV's. I've never had this issue before where they were notably different after they had been equalized.
 
Its correct.
It will never have the same out and input on ampère.
Reason is easy.
No battery are 100% the same.
Special with low ampère use your see a big difference.

Reason no cell are the same .
No lug is the same.

With all this you have always some differences load.
 
I understand your statements; but:
Back in the days of AGM battery banks, we purchased batteries from the same LOT so they were as close as possible to identical. Then we worked the equalization process to help keep them as close a possible. My off-grid home in the 70-80-90's had 20 6v batteries in series-parallel. Paying attention to this gave me 7-8 years of service life which was well above normal of 5-6 years max.
Now we have LiFePO4 and there seems to be no attention paid by the vendors to selling pairs that match. I think it would be better if they did.
Anyway, thanks for the input.
 

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