How to charge a bank of 6V batteries
Well, I recently found out that the battery disconnect on my MH house batteries really does not fully disconnect the batteries. Kind of frustrating considering you would "think" that a battery disconn...
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At 8.5 volts I would think that the batteries are toast. If the onboard charger won't do it try a separate automotive charger, 40A or or so (10% C). It may well give you an error after several hours since it would not be designed of 400+ AH of battery. Just start it again. OR take two out of circuit and charge 2 at a time to get them up then reconnect and charge the entire bank.
Check the electrolyte level: Make sure the plates are covered. If they are, DON'T add water even if low. If low (but plates are covered) charge, then add water and charge again.
However, as I said at the beginning, they are probably severely damaged. Wish you luck, please keep us posted as sometimes with batteries, magic happens.
The best way to keep the batteries happy is to keep the onboard charger on. (Assuming it is a good three or four stage charger). Second choice is charge fully (check SG) then pull the negative connectors. A fully charged battery with no load will last for months. I pull the negative on my car in November and it starts first try in April.
Check the electrolyte level: Make sure the plates are covered. If they are, DON'T add water even if low. If low (but plates are covered) charge, then add water and charge again.
However, as I said at the beginning, they are probably severely damaged. Wish you luck, please keep us posted as sometimes with batteries, magic happens.
The best way to keep the batteries happy is to keep the onboard charger on. (Assuming it is a good three or four stage charger). Second choice is charge fully (check SG) then pull the negative connectors. A fully charged battery with no load will last for months. I pull the negative on my car in November and it starts first try in April.
