Dual battery charging

[Nude up]

Thats what I have installed in my boat in the cabin. It stays there permanently I had to extend my leads my haines 650 has 2 batteries either side of the transom no issues at all just make sure the one marked must go to the battery connected to the engine is correct.

[dmck]

As your batteries will never be totally flat (0 volts) this will be insignificant. Now that I think about it... 14.8 volts seems high for only a 4A charge. Most vehicles only charge at around 13.8 volts.
I'm guessing you want to leave the chargers on in 'float' mode so your batteries are always topped-up. You will have no troubles.

[Nude up]

Mine is a 12amp unit when I return from fishing I plug it in it maintains the battery really happy so far with mine

[sandef]

Extended my charger leads by 1.5 mts with 2.9msq cable used cable size calculator to work out the voltage drop for cable size final voltage drop was 0.2 of a volt