I have a 6ooAh AGM batt bank on a sailing boat (3 x 200Ah)
What is the max safe current drain for said bank, especially with longevity in mind?
I have a 1,6kW 230V AC watermaker and would like to run it off the batt bank through an inverter for about 30min at a time. (and some other power tools on the odd occasion)
I do have a generator so that watermaker can be run for longer periods but for 30min (making 50L of water), it would be very convenient to not use the generator, not to mention saving petrol, fumes, and noise.
I have 640W solar and 300W wind gen which should be more than enough to deal with the discharge, I believe, on a sunny day.
So, is there a rule of thumb for a max safe discharge current for (AGM in my case) Lead Acid Batteries?
My gut feeling is that 300A for an hour on a 600Ah bank should be safe. But then my 2nd gut will freak out when it sees 200A of discharge on the BMV.. Even 100A is a hell of a lot in my mind.