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Old 12-06-2021, 17:25   #1
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Lifeline AGM and Victron charging

I seem to have a problem with my batteries and getting them charged. and I hope someone can give some advice.

I have a victron multiplus 110v connected to a bank of lifeline agm's with 660ah capacity.

Currently when I connect to shore power or charge off the engine for that matter, the batteries reach around 13.80v in bulk in around 10 minutes, then the charger drops into absorption and the current tapers off into float volatage in around an hour. The current then sits around 3 amps trickle charging. On todays cycle, Im now at 87% charge with a 90Ah deficit.

I have connected to VE configure and followed Victrons settings videos but it makes no difference to the charging cycle.
The settings I have are:
State of charge when bulk finished 85%
Absorption voltage 14.27v (its hot here and I took this number from the Lifeline manual)
Float voltage 13.25
Charge current 100A.

As the charger is not reaching any of these voltages should I assume that its just the batteries dying, or have I missed somthing obvious. And even though I cant seem to get them up to a full charge, can I try to condition them (following the lifeline manual) or will this irreperably damage the batteries?
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Old 12-06-2021, 17:59   #2
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Re: Lifeline AGM and Victron charging

What is the Multiplus reporting for battery temperature towards the end of the bulk phase?


Also, if you have any DC loads and the Multiplus isn't the only source of power in and out of the battery, you need a separate battery monitor as the one built into the Multiplus will be wrong (it's unaware of those other loads).
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Old 12-06-2021, 18:40   #3
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Re: Lifeline AGM and Victron charging

it's not dying batteries. the charger should be able to get the batteries to 14.3v no matter what. unless they were shorted out and taking more then 100a due to the short. but then those would blow up pretty quickly...

when the charger is in bulk measure the voltage at the output of the multi and the battery themselfs. if you have small / bad cables it'll hit 14.3 at the charger output and could cut off to float early though the batteries might only be at 13.8. a 0.5v drop with 100a charger is certainly possible. though an inverter / charger should have huge cables and not much drop.

also since the multi has a battery temp the voltage will be lower if its' really hot. but 0,5v lower is a lot. maybe if it was 40c out. you could unplug the battery temp sensor and see if the batteries hit 14.3v


also if the bank is only taking 3a at float it's probably full and you should reset the meter.
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Old 12-06-2021, 19:20   #4
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Re: Lifeline AGM and Victron charging

Interesting...

I also have a victrom smart bmv in the system and a colour control unit networked into the multi.

I just turned it off and back on again to getthe multi back into bulk, albeit briefly (like a couple of minutes) the battery temperature is reading 29C or 84F

In Bulk
Multi 14.3
Batteries around 14.2
Didnt get the chance to check the reading of the smart bmv or the colour control unit before it dropped into absorption.

In absorption
Multi 14.21
Batteries14.09
Both the smart bmv and the colour control unit are reading 13.9.

So should I just ignore the voltage/state of charge at the smart bmv and colour control unit, and use a multi metre to check voltages from now on? Or is there a way to recalibrate them?
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Old 12-06-2021, 19:50   #5
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Re: Lifeline AGM and Victron charging

Try turning on DVCC on the Color Control. You can have the Multi work off the voltage reported by the battery monitor (make sure it's getting its power feed right from the battery positive terminal) instead of its own internal sense. Also make sure that there aren't any ground cables bypassing the shunt for the BMV, as that will cause inaccurate readings.
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Old 12-06-2021, 20:45   #6
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Re: Lifeline AGM and Victron charging

Something is wrong with the cabling, probably a high contact resistance somewhere. Where the GX and BMV measure a lower voltage than the battery voltage: check both voltages with the multimeter. Measure at where the BMV connects to as well as on the shunt itself.

It can even be the fuse of the BMV voltage sense wire.
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Old 12-06-2021, 21:04   #7
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Re: Lifeline AGM and Victron charging

Hmm, thank you all for the fantastic replies. Im heading out but will investigate properly whan I get to my anchorage....
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