Originally Posted by camaraderie
SOLARE...you are correct...do NOT do what Xantrex suggests. If you are not content with estimates then you can do the following.
1. EQ the batteries.
2. Fully charge the batteries.
3. You have approximately 400ah capacity at the 20 hour rate which means that at a 20 amp load you should get 20 hours before you reach 10.5 volts. 4. Get a 20 amp test load and run the batteries down to 12.2V. (50%). They SHOULD last 10 hours before reaching 12.2V. If they only last 8 hours...you have 80% of rated capacity...5 hours is 50% etc.
5. Again...if the batteries are new...no need to go through this.
These batteries were installed by the PO age unknown, and the fact the boat was keep on a mooring, I had no clue of their condition.
Good news is, I ran a 20+/-amp load on the bank and got it down to 12.2V at 12 hours, in addition the Link told me that I had consumed 215 amps.
So it looks like these batteries will be around for a bit longer!