Battery Bank Dying

[Ski in NC]

Look at the center jumpers on the bank. For a 24v bank, there really should be no leads connected there except for the jumpers themselves. If there are other leads connected there, track them down and see if they go to loads.

 

[OldDan1943]

Visually inspect each battery, looking for swelling of the cases.

Just a wide suggestion, physically swap the battery positions and see if that makes a difference on the charge. It will be interesting to see the results.

Did I miss a mention of an inverter onboard. Is it a combination charger/inverter? Size of each?

 

[Datenight]

Thanks everyone. There and no loads, jumpers only between batteries. I agree FF once dead always dead but will save for cores. We disconnected and moved the dead batteries to one end. Now have a 270 amp bank at 24 volts. With 660 watts of solar we should be fine. All lights are led and we cook with gas. The refrigeration is very efficient. Our biggest draw is the auto pilot in heavy seas.

Did a test today on the reconfigured bank. Voltage held so we may be out of the woods. Leaving 16 December at 01:00 UTC so will be out of touch until we reach Barbados. Expect to take 14 days for that but we have been exceeding predictions.

Rob

 

[OldDan1943]

Internet can contain LOTS of information. This video address AGM car batteries.
May have have some application for marine AGM

 

[FF]

For folks that desire 12v from a 24v starting system the Vanner works very well.
Battery Equalizers - Vanner

https://www.vanner.com › battery-equalizers

VANN-GUARD®, BATTERY EQUALIZER, 70-60, Owner's Manual · F.A.Q.. VANN-GUARD®, BATTERY EQUALIZER, 70-80, Owner's Manual · F.A.Q..