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Old 06-08-2021, 08:41 AM   #1
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I'm going to replace my batteries in my 2006 Maxum 2200SR3, dual battery set up. Last trip out after a day on the water it started but had a slow crank. I just bought the boat so I wanted to start with fresh batteries. Just wanted to see what size I should be putting in. Thanks!
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Old 06-08-2021, 10:40 AM   #2
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Batteries were installed by the dealer when the boat was new, so you’ll have to look at what size you have now to be certain the new ones will fit your boxes.

Did you leave the battery switch in ‘Both’ while on the lake? The purpose of a dual battery setup is to isolate the starting battery from the house loads so you’ll have a fully charged battery for starting.
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Old 06-08-2021, 05:32 PM   #3
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I had the switch on both while under way, but when I was stopped I had it on one. When I went to get back under way I switch it to both and that's when I got the slow crank. I also notice that while on one when I was sitting there wasn't enough in it to even run the radio, so I'm thinking I'd rather just replace both for peace of mind, just gotta figure out which group. Last thing I want is a battery issue out there.
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Old 06-08-2021, 08:50 PM   #4
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You should have a starting batt and a deep cycle house batt.

My set up is like this:

Pos 1 - starting batt
Pos 2 - house batt

Put it on pos 1 to start and run (both batts are being charged)
Put it on position 2 when stopped and back to pos 1 to start and run.

I have never use Both. That is for emergencies only.
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Old 06-08-2021, 09:41 PM   #5
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Gotcha, this is my first two battery set up so I'm definitely still on the learning curve, much appreciated. What group number batteries are you running?
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Old 06-08-2021, 10:21 PM   #6
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I have group 27's but go as big as your trays will allow or if room, add larger trays.

The whole purpose of the switch is isolate the 2 batts. using BOTH will draw them both down.
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Old 06-08-2021, 10:46 PM   #7
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Thats what I was looking for! Thank you!
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Old 06-09-2021, 01:11 PM   #8
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Looks like I have two cranking group 24 batteries in there now, the one being a 625 cca. According to the book it says it needs 800cca. Batteries are also small for their trays so I'll upgrade to the group 27's, probably Interstate Marine cranking and one deep cycle. How can I tell which battery is on position 1 and which is on position 2? I have one battery closest to the stern and one perpendicular that is closer to the bow.
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Old 06-09-2021, 01:12 PM   #9
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See picture below:
Attached Thumbnails
IMG_7899.jpg  
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Old 06-09-2021, 02:56 PM   #10
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Disconnect the NEGITIVE cable from one battery and turn switch to #1 position, turn on any light or try and crank engine, that battery will be either #1or #2.
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Old 06-10-2021, 10:48 AM   #11
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Perfect, thanks!
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Old 06-28-2021, 08:48 PM   #12
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Just an update, I went with group 27's, one cranking and one deep cycle, both Interstates. I put the deep cycle in the spot closest to the stern and I hooked it up first. When I put all the wires on it I noticed the automatic bilge pump came on, so I'm assuming I have the deep cycle in the right spot. The cranking battery I put in the other slot. Looks like it has a negative that runs from it to the negative on the deep cycle and the positive has two cables both are going from the battery to the battery switch. When I was stopped with the engine off and the radio on I rotated the switch from 1 to both and to 2. In all positions the radio played. Does this sound correct?
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Old 06-29-2021, 01:24 AM   #13
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Sounds right to me.
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Old 09-22-2021, 03:19 PM   #14
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Back to this. I went out last weekend and everything was great on the way out. We stopped to grab lunch and when I went to leave I had a long crank before it fired up. Once running it ran as if everything was fine. We went to an island and sat out for about 3-4 hours. When I went to leave I once again had a very long crank before it fired up. Drove home with no issues. When I got back to the dock I turned it off, waited a few minutes then tried to start it again to see what happens. This time it cranked slow like the battery was weak but did eventually start. A few days later I put a multimeter on my batteries prior to starting it and had 12.1 on the cranking battery and 11.8 on the house (deep cycle). I started the boat and at fast idle I have 12.9 on the cranking but 11.8 still on the house. So it doesn't appear my house battery is charging. Now I'm looking for suggestions and thoughts on where to go and what to check next. Thanks!
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Old 09-22-2021, 04:03 PM   #15
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Are you charging on shore power as well? If not your new batteries may need a lot of run time for the initial charge.

I installed a battery monitor and was surprised how slowly batteries charge under way. With all the house loads going, the batteries got maybe 10 amps or so (into both combined). Even if the alternator can put our more, there is a limit to how much current the batteries will accept. A group 27 is around 80-90 Ahr of total capacity so if you were at 50% in both batteries and the alternator was charging both, it may be several hours of cruising (~8 hrs at 10 amps into 2 batteries at 50%) to top them off.

Obviously disregard if you were hooked up to a shore power charger for a few days.


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Old 09-22-2021, 07:28 PM   #16
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I don't have shore power per se, I do have what appears to be a trickle charger that is hooked to both batteries and just plugs into an outlet. I did try plugging that in and when I did the house battery jumped to 12.4v. My next thing to check is the alternator to see what it is putting out, am I understand correctly that it should be putting out 14ish volts directly off of it?
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Old 09-22-2021, 08:47 PM   #17
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NON MARINE TRICKLE CHARGERS ARE A BIG NO!NO!
Any and all items in engine bay should be Marine rated!
Otherwise you may get a very big boom!
Don
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Old 09-22-2021, 08:58 PM   #18
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I definitely did not leave it plugged in, but I believe it is a marine charger, its bolted to the interior of the engine compartment. I think its a prosport brand, its yellow, I double check on the brand when I'm back at the boat.
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Old 09-22-2021, 10:11 PM   #19
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Being this is a 2200 I'm assuming you have a simple system with 2 batteries and a battery switch with no ARC. If so the alternator will only charge the battery selected by the switch. In my case i switch between Batt1 and Batt2 every other trip to keep both batteries charged. The alternator should put out around 13.5V when running. If it's less you could have a week battery, corroded cable, or weak alternator.
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Old 09-23-2021, 10:32 AM   #20
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In post #9 I have a picture of my setup if that helps, albeit it is before I replaced my batteries with brand new ones. I rotated the switch from one to two to both and there was no increase in voltage to the house battery. Saturday I'll check the alternator and report back. It was my understanding that both charged when in the both position.
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