So I know everyone can agree that leaving a battery
in a partially discharged state is bad. My question is how long is a partially discharged state?
Let's say you have a 870ah bank and on a passage
you use 240ah per day (10amps per hour). You have solar panels
that put 60ah back into the bank each day. So by my math that means your net usage is 180ah per day which would give you 2.4 days of battery
power before needing to be recharged. So that leaves your batteries in a partially discharged state for 57 hours. Now my assumption is once every now and then is ok but if you are on a 30 day passage
that means you are constantly leaving your batteries in a partially discharged state for most of the passage. At what point does this become detrimental?
To me it would seem ok during the passage but on the flip side if I were to partially discharge my bank and then leave the boat for 2 days without any charging
and then come back I would feel like I was damaging the bank.
So how much is too long to leave a battery in a continuous discharged state in this fashion?