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Joined: 08:22am - Sep 1,18
Posts: 6
Location: Downers Grove

Post Posted: 03:28pm - Sep 9,18 
So I'm going to upgrade my trolling motor from 12v to 24 volt. (Got a steal of a deal on a terrova) My 2 bank 12 volt charger won't cut it, so do I install a 3 bank 120v charger, or a 3 bank alternator charging system and just plug in a 12 volt charger into the system when parked?
If I put in a MK330pc at about $250, running my motor will not charge the trolling motor batteries. But with the boat sitting idle in the garage, it will charge and maintain the batteries.
If I put in a MK3DC, it will charge all three batteries with the motor running, and I can add a portable charger to the input circuit when parked.
3lbs vs 8lbs is not a big deal, but I don't want to buy both. losing my guest charger and isolator might give me enough room. I'm just looking for some options.



Joined: 02:23am - Dec 3,11
Posts: 394
Location: Highland Indiana

Post Posted: 04:56pm - Sep 11,18 
Go with the 3 bank charger, Running your motor will not charge the trolling motor batteries sufficiently. Also how do you expect to charge a two bank 24v system with a plug in portable charger? You would have to charge one battery at a time, that becomes almost impossible. That's the reason onboard chargers exist. I will also suggest this- go with a 15amp 2 bank charger for TM batts then use a portable on your starting battery. Since your starting battery will be getting charged from your outboard, topping it off with a portable is okay,doesn't need to be every night either. The more amps you have charging the Trolling batteries the quicker they will charge.

1987 Lund Baron
2005 Yamaha f150
1994 9.9 Merc 2 strk w/controllking
Rhodan 72" 36v 120 lb. trolling motor
2 Simrad NSS12
Lowrance HDS 10 gen2
Simrad Is40
Lowrance point 1
2 36" Cannon tracks
2 electric downriggers
2 High Seas quad rod trees
4 Bert's ratcheting rod holders


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Joined: 04:24pm - Jul 6,07
Posts: 296
Location: DuPage County, IL

Post Posted: 12:14am - Sep 12,18 
If you have 3 batteries then just get a 3-bank charger. If it is a good charger you can leave it plugged in all winter to keep the batteries healthy.

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