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Old 06-23-2017, 08:40 PM   #1
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Link 2000 heart interface

Help please! Our batteries appear to be charging as normal and at the end of the day the volts are 14 and the batteries 100% but by nightfall the volts drop to 10.4 and we have to put on motor or generator and through the night we turn off everything. This has only been recent as previously we have power all night for fridge freezer TV lights toilet etc! We have 4 x 2 year old glass mat batteries. We have checked each battery separately and all seem to charge equally. Any ideas?
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Old 06-23-2017, 09:14 PM   #2
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If your batteries charge to 14V and then drop to 10.4 overnight which is essentially fully discharged, then either you have too much load or they are bad. Given that you imply that they worked fine in the past, then replace them.

The other question is why they failed so soon. Maybe the charging parameters?

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Old 06-23-2017, 09:48 PM   #3
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Either there are loads, charge source failing, wiring/connection issues, or your bank has died prematurely.

Are you assuming your Link is accurate as to the bank being full?

Verify everything with DMM, clamp ammeter. Starting with charge algorithm, do amps fall to 2-3% of bank AH before going to float?

Do you see any load amps flowing out?

Isolate all loads for a couple cycles.

If you conclude the bank's dead, do a 20-hour load test on shore before scrapping.
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Old 06-24-2017, 12:05 AM   #4
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Agm

The volt meter and link are showing full at the end of sunny day but on anchor it never says float only when on shore power. There are no loads on it that we don't know about as we are on a yacht and only have a fridge and freezer tv and led lights
We have tested each battery separately. There is a red flashing light from our solar panels and wind saying volts low even though link is saying everything is full!
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Old 06-24-2017, 12:10 AM   #5
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Could a surge from the marina we were plugged into damage the batteries because before we were plugged in the batteries were fine and it's since we unplugged and are at anchor that the trouble started
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Old 06-24-2017, 06:38 AM   #6
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"Could a surge from the marina we were plugged into damage the batteries"

More likely to damage the charger.

"We have 4 x 2 year old glass mat batteries."

If overcharged these can have the tiny amount of liquid inside boiled off.

The charge voltage might be finishing too high , ask the batt mfg. for charge regime
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Old 06-24-2017, 07:32 AM   #7
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Thank you for that advice I will try that!
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Old 06-24-2017, 07:33 AM   #8
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Thanks David
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Old 06-26-2017, 06:43 AM   #9
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I an a great proponent of SOC meters,

But for trouble shooting a quality hydrometer , with thermometer , and a pencil and paper cant be beat.
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