Hi all. I recently got a smokin deal on 2 firefly group 31 batteries. We cruise and anchor alot in the summer and really like the batteries.
things seem to be operating well. I have a couple questions for the group to see if my setup needs tweaking
i have the MMI single wire alt. it is the 120A model? excite lead is to the positive side of coil. MMI coil
electronic ignition
i use a dedicated start battery group 27 deep cycle.
i have a blue sea auto ACR
xantrex link lite battery monitor with shunt ect.
alternator wire goes to house bank. 2 group 31 fireflys mounted paralell
pro mariner shore power charger 2 bank
after being on shore power, the volts jump right away, to 14.2 sometimes 14.3
if we are on the hook and the house bank goes to 80 percent depleted, i torch off the motor and it does take 30 seconds or so for the alternator to fire off. it will charge at around 44 to 45 amps at 13.8 or so. as batteries fill this creeps up to 14.0 or so.
the information that i am finding on the fireflys is so confusing and varying that it makes it impossible to figure out anything. my shore charger is the bulk and absorption rates for firefly batteries according to the manual. so im just going with that for now. i really want to keep the system reasonable as this is not the forever boat.
any comments? advice? should i run the alt wire to starter? excite wire to starter? external regulator? leave it alone because it works fine?
things seem to be operating well. I have a couple questions for the group to see if my setup needs tweaking
i have the MMI single wire alt. it is the 120A model? excite lead is to the positive side of coil. MMI coil
electronic ignition
i use a dedicated start battery group 27 deep cycle.
i have a blue sea auto ACR
xantrex link lite battery monitor with shunt ect.
alternator wire goes to house bank. 2 group 31 fireflys mounted paralell
pro mariner shore power charger 2 bank
after being on shore power, the volts jump right away, to 14.2 sometimes 14.3
if we are on the hook and the house bank goes to 80 percent depleted, i torch off the motor and it does take 30 seconds or so for the alternator to fire off. it will charge at around 44 to 45 amps at 13.8 or so. as batteries fill this creeps up to 14.0 or so.
the information that i am finding on the fireflys is so confusing and varying that it makes it impossible to figure out anything. my shore charger is the bulk and absorption rates for firefly batteries according to the manual. so im just going with that for now. i really want to keep the system reasonable as this is not the forever boat.
any comments? advice? should i run the alt wire to starter? excite wire to starter? external regulator? leave it alone because it works fine?
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