- Feb 6, 1998
Please be very careful or you can ruin your Firefly's, if you continue taking them to 14.71V as shown in image 3.. I am guessing the 22C, in image #2, is the battery temp?Thanks to everyone for all the great advice. New system is up and running and we love it. 3 x Firefly G31 with a Rolls GR24 Reserve in the settee. Linked with an ACR. Balmar Sg200 monitor and Victron MPPT solar charge controller with smart link battery temp feedback. Perfect for us as we don't have shore power. After a lot of though decided to stay with the original 1-2-both switch for ease of wiring, using only the #1 position. 2 is available if needed. both is marked inop. Its great!
If this is so, it does not warrant compensating the battery voltage to 14.71V. Be sure your controllers/chargers/regulators have the correct mV per degree C compensation slope programed into them. It should be 4mV per cell, per degree C change, or 24mV, per 12V battery, per degree C change. 14.4V is the maximum voltage for absorption @ 25C/77F.
Also while the interconnects are neat and tidy a small arc in the jumpers relieves the strain on the terminals, especially when they are not restrained. They also like a bit of air space between them, unless you are always in cooler waters, but they do heat up if charging them correctly.