06-360 DA BATTERY QUESTION

[see ray]

So there’s 31DC (deep cycle ) and 31DPDC ( dual purpose/deep cycle) I would like to change all our batteries
Marina Battery question for my 05 360 DA, the owners manual says to use for 31 deep cycle batteries 31DC !!! Online I am reading that you should use dual purpose starting/deep cycle batteries and not to use the deep cycles alone for starting your boat. What have you guys put in your boat? Will the deep cycle batteries work?? I don’t wanna ruin any of the electrical system in the boat . Again, the owners manual is calling for 31DC ??
Help help help

 

[dtfeld]

Not familiar with how that boat is wired (1 battery for starting and 1 house or 2 in parallel?) but bang for the buck, I've swapped over to G31 AGM's. Sams has them for pretty good price. Lots of discussion on here weather or not they are worth it, but with a good charger, getting 7-9 years on a set.

Oh and no maintenance.

Duracell AGM Deep Cycle Marine and RV Battery , Group Size 31 - Sam's Club

Buy Duracell AGM Deep Cycle Marine and RV Battery , Group Size 31 : Marine Batteries at SamsClub.com

www.samsclub.com

 

[dmorris800]

So there’s 31DC (deep cycle ) and 31DPDC ( dual purpose/deep cycle) I would like to change all our batteries
Marina Battery question for my 05 360 DA, the owners manual says to use for 31 deep cycle batteries 31DC !!! Online I am reading that you should use dual purpose starting/deep cycle batteries and not to use the deep cycles alone for starting your boat. What have you guys put in your boat? Will the deep cycle batteries work?? I don’t wanna ruin any of the electrical system in the boat . Again, the owners manual is calling for 31DC ??
Help help help

In total how many batteries do you have? How long have they lived on the boat?

I think you would be fine with deep cycle batteries for your house. Normally dual purpose / starting batteries are for the engines batteries (they can support high amperage for cranking for a short bit). If you have been using deep cycle in the past for everything and it is lasting, you should be good.

If you do wish to switch over to AGM batteries, please remember that you need to adjust the charger for the different charging profile. They are not the same.

 

[see ray]

In total how many batteries do you have? How long have they lived on the boat?

I think you would be fine with deep cycle batteries for your house. Normally dual purpose / starting batteries are for the engines batteries (they can support high amperage for cranking for a short bit). If you have been using deep cycle in the past for everything and it is lasting, you should be good.

If you do wish to switch over to AGM batteries, please remember that you need to adjust the charger for the different charging profile. They are not the same.

I have four batteries in the boat, the ones that are in there now are the dual purpose starting/steep cycle batteries group 27, I think the deep cycle batteries for as much as we start. The boat should work the batteries I have in there now are four year old And was recommended by The Marina to change them I may have one or two batteries, but I change all four one time the batteries that are in there came from the previous owner. He changed them in 2019.

 

[AllTideUp]

They type of battery you get depends more on how you are going to use the boat. I generally get Dual Purpose batteries for mine, swapped the group 27 for 31s.

If you normally run your boat from batteries only (fridge, lights, overnight loads) which run them down alot and not using the gen to keep them topped up then Straight deep cycles are probably the route you want to go as normal starting batteries are not meant to be run down like that and will hurt/damage the batteries. However Deep Cycles don't like the high intensity loads like starting a v8 engine. But since you have 2 batteries in parallel it shouldn't be a problem.

If you do run your gen pretty frequently and are not constantly running them down I'd go with the dual purpose as these are the middle ground where you can run them down but aren't really meant to do it all the time but you can also start the engine without damaging them either.

 

[see ray]

They type of battery you get depends more on how you are going to use the boat. I generally get Dual Purpose batteries for mine, swapped the group 27 for 31s.

If you normally run your boat from batteries only (fridge, lights, overnight loads) which run them down alot and not using the gen to keep them topped up then Straight deep cycles are probably the route you want to go as normal starting batteries are not meant to be run down like that and will hurt/damage the batteries. However Deep Cycles don't like the high intensity loads like starting a v8 engine. But since you have 2 batteries in parallel it shouldn't be a problem.

If you do run your gen pretty frequently and are not constantly running them down I'd go with the dual purpose as these are the middle ground where you can run them down but aren't really meant to do it all the time but you can also start the engine without damaging them either.

I believe their in parallel

 

[AllTideUp]

I believe their in parallel

Yes, you have starboard side in parallel and a port side in parallel.

 

[see ray]

Yes, you have starboard side in parallel and a port side in parallel.

So each bank would be 12 V but now I would have 1750 cranking amps/amps, which is more than sufficient to start the motor because the motor I checked with Mercruiser requires 800 cranking would I be correct?

 

[AllTideUp]

So each bank would be 12 V but now I would have 1750 cranking amps/amps, which is more than sufficient to start the motor because the motor I checked with Mercruiser requires 800 cranking would I be correct?

Yes, each bank would still be 12V. Since your pulling off of 2 batteries that's why using Deep Cycle is fine. I still use the Dual purpose but I rarely run completely off of battery only for long periods of time. With the weather here I usually have the generator running anyway.

If you haven't done so, or if it hasn't been done yet, I'd change out the original Battery Charger for one of the smart chargers. I have had the old one cook my batteries before.

 

[see ray]

Yes, each bank would still be 12V. Since your pulling off of 2 batteries that's why using Deep Cycle is fine. I still use the Dual purpose but I rarely run completely off of battery only for long periods of time. With the weather here I usually have the generator running anyway.

If you haven't done so, or if it hasn't been done yet, I'd change out the original Battery Charger for one of the smart chargers. I have had the old one cook my batteries before.

Where either at our dock, or we go to the island/other marinas or someplace, but usually I have a destination, and we always plug in a short power, on occasion will anchor out at the beach really not running much off the batteries .

 

[dmorris800]

Where either at our dock, or we go to the island/other marinas or someplace, but usually I have a destination, and we always plug in a short power, on occasion will anchor out at the beach really not running much off the batteries .

I think either way for your situation you will be fine. If they have lasted 4 years and lasted good, I would use the same. A new charger that takes into account the battery type and charging cycle for each is also a good idea. My only caveat is that I would swap one bank now and the other at the end of the season to stagger them. This way if the bank is actually getting worn down you have slightly younger bank to emergency start off of.

 

[Michael Mirra]

I use 4 group 31 DP. Rarely use my generator and have had not problems

 

[Stee6043]

I just dropped 4 of these in my boat yesterday. Two that I replaced were from 2019, the other two from 2020. Only one bank needed to be replaced but if I'm going through the pain of doing it, might as well do 'em all.