Noob battery question

Just starting out kitting a 1972 14’ mirocraft deep fisherman. I picked up a 9.9 Honda with electric start.

Owners manual specs min battery requirement is 12v 35ah.

I don’t have a trolling motor (yet) or other electronics (finder etc) yet but would probably like to add them in the future.

What do folks recommend for something like this?

cheers


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I have the same boat with a Suzuki DF9.9 remote!

I use a 24MS 625MCA for the starting battery and to run 2 fish finders, lights, and misc.

My Df9.9 does not charge the battery until it gets to 6 volts, so I monitor it with a dual volt meter. Also the manual states not to use a deep cycle battery for the starting battery.

I also have a 24DC 690MCA for my Motor Guide Xi3 trolling motor. I also monitor it with a dual volt meter.

Never had any issues with low batteries for 1 or 2 days of use, always keep them charged.

My Df9.9 does not charge the battery until it gets to 6 volts, so I monitor it with a dual volt meter.

Click to expand...

Is that right ... 6 volts? Most 12V batteries fully charged to read 12.7 volts are pretty much dead around 12 volts.

Misread my manual, the alternator is designed to maintain a charge, not to charge the battery. The charging system turns off to the battery at 6vdc.

Here is snapshot of the manual.

I would use a Group 24 dual purpose for the outboard, bilge, lights, and graph.

If you want to add a trolling motor it would be wise to have it on it's own deep cycle battery.

I run my 2019 Suzuki DF20ATS(327cc) with my Honda 400EX Lifetime (grandfathered in) 120ccA battery from Cycle Gear . . . in addition to electric start and power tilt, only run nav lights, air horn compressor and air-bed compressor. I know what the manual says but I've had no issues and really like the weight savings.
Works for me, since I can't run the boat and the quad at the same time anyway . . . LOL
BTW . . . the battery charges fully to 14.7V

PATRIOT2 said:

BTW . . . the battery charges fully to 14.7V

Click to expand...

That's 14.7 is the charging voltage. leave it sit -or- apply a small load and it will read the actual voltage of a fully charged battery...12.7v

I can take the charger off and my multi-meter says 14.7 and just activating my digital volt meter on the battery box drops to 12/7

InSaneFisherMan said:

Misread my manual, the alternator is designed to maintain a charge, not to charge the battery. The charging system turns off to the battery at 6vdc.

View attachment 107983Here is snapshot of the manual.

Click to expand...

That sounds like a protection circuit to prevent overloading the alternator by charging a defective or over discharged battery.

I just bought a DF9.9/20 conversion and I hope to take it out this weekend. I’ll try to remember to check the charging voltage.

Do not trust the motor to keep the battery charged. You need a good charger/ maintainer to hook up your battery(ies) to when not using them. Two batteries would be better, but you could get away with a single depending on how long your running and what size the trolling motor will be. With more details we can help narrow down our suggestions