Mac I was thinking about setting my terrova up with 4 batteries as you did. How are you charging them? I have an on board 3 bank charger but am I right that it wouldn't charge the two extra batteries? If I go for a whole weekend of fishing (like I am about to leave for) I have to be careful not to drain it so I end up using the kicker more. I was also thinking about just getting one of those small honda generators to charge it with at camp each night.
Originally, the boat had a 3 bank on board charger.
one bank for the main battery.
The other 2 for the 2 deep cycles for the Terova.
I added the 2 extra batteries.
Actually, I originally had the 24's and then upgraded to the 29's for more run time.
Got another hour, vs the 4-5 I was originally getting.
Still not enough.
So I took back my old 24's from my son Jeff.
(He's thrilled)
And I mounted them, each in series, in parallel with the 29's.
I then got a super deal on a Cabelas Pro Series 12 amp on board 2 bank charger and hooked that up to the 2nd set of batteries (the 24's).
Hope that makes sense.
Now I simply plug in both chargers when I come in.
The on board chargers have isolation circuits in them.
So they can be wired without issues.
I love the set up.
Lots of weight up front, but works well.
Now, if I only had a 90 hp main motor instead of the 60hp.
If you have a lot of room, go with four series 31's.
BOOM!