Originally Posted by SV THIRD DAY
But then I can't leave my refrigerator
pumps, etc turned on.
Why not just set your solar controller to a Max voltage output of 13.4v going to your LeFePO4 battery bank and leave everything alone? I know I'm not risking a sub 10% battery condition due to the size of the solar and load and at 13.4v I can't over charge the battery either. Maybe it's the difference between a weekend boat and living aboard, but I want my 400AH LiFePO4
bank to be as "set-it and forget-it" as possible while we are living aboard here on a mooring
. If I had to remember to connect and disconnect my batteries every time we left the boat.....
I have two boats. One I use for the winter in the Bahamas
. I am either on or off the boat.
I have anoth smaller boat up here in Canada
, with 360Ah LFP. When I am in the Bahamas
boat gets this treatment.
LFP drained to ~50% and disconnected.
Shore power charger
connected - only to LA starter battery, which is also now connected to the house. Our area has very little below freezing and I run two moisture Air Dryr which habe a fan and a very small heater, enough to keep the temperature in the boat above the dew point.
In summer when I use the boat now and then.
Low usage times - i.e. i am working down the "honey do" list:
- LFP are connected.
- No shore power
- I have a 12V-100W solar panel directly connected (no charger - cheap, cheap).
- The programable voltmeter is set to 13.8V HV off , 13.25V HV back on.
Only the drain for the electronic panels
, battery monitor
are slowly draining the battery down. It takes about 10-15 days to go from full and HV chargers disconnect - down to reconnect and solar charging - to full and chargers disconnect.
High use time:
When I am likely to go out soon again I plug
into shore power and switch the fridges on. Now the cycle time is about 1.5-3 days.