I would appreciate advice with respect to the charging
settings for my mains battery charger
and solar charger
3 X 205AH 12V Bosch N200 batteries FLA type
Dolphin Series 1 120-240V charger
Boost 3024iL Solar charger controller
2 X 250W Solar Panels
The old generation Series 1 Dolphin has only two switchable settings
"Free" - 13.9V Charge, 13.2V Float
"Gell" - 14.4V Charge, 13.6V Float
The Solar Boost is multi-switchable
Charge - 14.0V through 14.8V in 0.2V increments
Float - 13.2 through 13.8V in 0.2V increments
For all but 2-3 weeks of the year coastal or at anchor
, the boat does weekly to fortnightly day sailing
with an occasional overnight. Otherwise it sits at the marina on the charger.
I have noted that the batteries go through what seem like a lot of water
- e.g. 10 litres in 6 months.
The limitation of the Dolphin is that it has only the two programs, and I suspect that FLA batteries should sit on float using the lower 13.2V "Free" program, even though its Charge/Acceptance is at a lower than ideal 13.9V level. (as compared to its "Gell" program). BTW Until I recently noted this it had been on the "Gell" and I wonder if this is why it uses much more water
than I would have expected.
With the Dolphin set as above, how should I set up the Solar Boost. Currently it is as default, being Charge/Acceptance 14.4V and Float 13.2V.
I could dial it down to 14.0V as its minimum Acceptance voltage to "near match" the Dolphin's 13.9V. In practive, at the dock
, it is not needed specifically unless the mains dockside circuit breaker trips (a monthly issue on average ensuring I visit the boat at least once a week given the fridges are running).
Thanks for any advice you can offer.