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Post by vasko on Nov 6, 2021 20:59:10 GMT
A 6 battery 12v 170ah victron agm bank behaving strangely…
1. Bank keep going very fast to low voltage 11.8
2. When start the engine all batteries accept different charge currents - 12.4A, 5.4A, 2.4A, 1.2A, 8A, 18A - the more current the battery accepts mire hot the battery is - e.g the one accepting 18A cannot be touched - so hot it gets
Any idea what is wrong and which batteries are in better condition ? The one accepting less charge or more charge ?
Any suggestion appreciated …
All setup is original victron with charger-invertor etc.
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Post by zaphod on Nov 7, 2021 0:32:04 GMT
It is not normal for a battery to be getting hot. My guess it has a bad cell.
Your best bet is to separate the batteries and test each one individually. I suspect you will find the overheating one has low voltage because it has a shorted cell.
You have 6 batteries in the bank and only 170ah capacity? They must be very small batteries.
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Post by vasko on Nov 7, 2021 6:22:57 GMT
It is not normal for a battery to be getting hot. My guess it has a bad cell. Your best bet is to separate the batteries and test each one individually. I suspect you will find the overheating one has low voltage because it has a shorted cell. You have 6 batteries in the bank and only 170ah capacity? They must be very small batteries. Each battery is 170ah |
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betto
New Member
Posts: 8
Jeanneau Model: ooooooooooooooooo
Country: Italia Roma
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Post by betto on Nov 7, 2021 6:31:26 GMT
Controlla che i morsetti delle batterie sono stretti bene e sono puliti. Altrimenti è la batteria rovinata.
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Post by Charlie-Bravo on Nov 7, 2021 9:16:52 GMT
Very odd behaviour, I second the idea of separating each battery and individual test.
For AGM 10 to 20% of the amp hour rating is good for bulk/absorption with a max of 30% ! ( reading your other posts I know you know this already) so the 18 amp charge shouldn't be stressing the battery and making it hot, the fact that the bank of batteries have so much variation in charge rate does indicate a shorting problem in one or more cells ... upsetting the bank.
If you don't fancy isolating and testing in one hit, I would perhaps start by disconnecting the hotter batteries and see how the rest of the bank behaves.
Does the same thing happen when you plug into shore power and use the mains charger?
With a 1020 AH bank ..... this is not a boat, it's a floating power station!
Happy testing
CB
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Post by zaphod on Nov 7, 2021 17:43:19 GMT
It is not normal for a battery to be getting hot. My guess it has a bad cell. Your best bet is to separate the batteries and test each one individually. I suspect you will find the overheating one has low voltage because it has a shorted cell. You have 6 batteries in the bank and only 170ah capacity? They must be very small batteries. Each battery is 170ah Oh OK, really BIG batteries then! |
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Post by vasko on Nov 7, 2021 18:35:12 GMT
Very odd behaviour, I second the idea of separating each battery and individual test. For AGM 10 to 20% of the amp hour rating is good for bulk/absorption with a max of 30% ! ( reading your other posts I know you know this already) so the 18 amp charge shouldn't be stressing the battery and making it hot, the fact that the bank of batteries have so much variation in charge rate does indicate a shorting problem in one or more cells ... upsetting the bank. If you don't fancy isolating and testing in one hit, I would perhaps start by disconnecting the hotter batteries and see how the rest of the bank behaves. Does the same thing happen when you plug into shore power and use the mains charger? With a 1020 AH bank ..... this is not a boat, it's a floating power station! Happy testing CB it is a friend of mine boat  - my one is currently 720ah total all LiFePo4 - amazing power |
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Post by Mistroma on Nov 9, 2021 1:02:10 GMT
I remembered you had LiFePO4 and assumed they must be on another boat.
It does sound like bad cells. If plates short due to build up from shedding or buckling the battery will heat up when charging. I imagine some cells will be bubbling away but risky to check. The dud cells will be pulling any decent batteries down. Localised heat when charging and rapid Voltage drop when you stop charging is a strong indicator.
If you put a lot of current through a wire it will get very hot. Pretty similar effect with a shorted cell. Good advice to split the bank and check batteries. You might be able to save some time by removing the ones taking 18A and 12.5A first and checking charge currents on the others as a smaller bank. However, I'd bet you still end up checking them all one at a time.
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Post by vasko on Nov 12, 2021 6:51:24 GMT
Final result all batteries gone - only one can hold charge after 12h, but can give max 150 CCA instead of 1100 as per doc - e.g 1% heath - huge amount of money wasted fir only 3 years… of course victron warranty is only 2 years - after still case fr ne personally I’m not buying anything Victron fir myself - my complain not about price ot anything else but warranty time - simple off the shelf Varta is 40 month - too of the line Victron 2 years btw : strongly suggesting the following tools a.aliexpress.com/_vUXCnI€ 46,06 34％ Off | Mastech MS2108A Digital Clamp Meter Auto range Multimeter AC/DC 400A Current Voltage Frequency clamp MultiMeter Tester Back a.aliexpress.com/_ui4VOC |
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- my one is currently 720ah total all LiFePo4 - amazing power