Planning on upgrading the boats battery charging
system, and would like some advise/opinions on my preliminary plans.
The original set up from the factory was a Dolphin 2 output battery charger
, with one output connected to the house switch and one to the engine
start switch. The battery switches are wire in such a way as that when both house and start switches are put to the on position, the two banks are combined. See the attached diagram from the owners manual.
From the drawing, it looks like the alternator
will charge both banks when both switches are in the on position, if not, it will only charge the start battery
Prior to me buying
the boat, the PO fitted a vetus bow thruster, powered by 2 x 110Ah batteris located in the forward berth (not ideal). These batteries are not connected to the shore battery charger
, and from what I can see, the installers fitted a split charge diode on the alternator
output, with outputs to house, start and bow thruster banks.
Plans are to
1) Install 270 watts of solar
, which will be set up to only charge the house bank
2) Fit a Sterling Pro Charge 60 amp 3 stage charger with 3 outputs. This charger also has an equalisation facility.
I will connect two outputs from the charger direct to the battery posts of the house and engine
start batteries, or maybe follow the factory idea, and connect to the switches.
With respect to the bow thrust batteries, could I connect the third output from the battery charger to the output side of the split diode going to the BT batteries, or is this bad practise, and I should really run a cable the full length of the boat from battery charger to bow thrust batteries (a distance of about 42 feet)
Is there any sense in putting isolating switches (on/off) in the output side of the battery charger cables
For example, I may think that the bow thrust batteries need a good equalisation charge, but theother banks do not, so I could isolate them from the charger, and just put the equalisation charge to the bow thrust bank only, or am I over engineering this?
I really do need to upgrade the system, but don’t want to go overboard
with unnecessary stuff, so any help from the electrical
experts would be most welcome