1995 ProMariner 30 Battery Charger

I guess I’ll be using this charger to keep the batteries charged in the Winter and look for a bigger one for the boat. Any suggestions on size or brand?

I just have 2 batteries that are used to start the engines and as house batteries. I assume they’re in parallel. There is a battery switch that has 1-2-both-off.

10A per bank or 20A per bank?

Yes and yes. Thanks for the info.

Would this work?
ProMariner ProSportHD 20 Global Gen 4 - 20 Amp - 2 Bank Battery Charger

Thanks.

I didn't follow it but it wasn't connected inside the charger unit. It was just wrapped in electrical wire. I think they might have made their wiring harnesses with the 3rd wire in case the customer added the generator. Or maybe there was an option for a 3rd battery.

Thanks for the info. I've started researching a bit more and I'm looking hard at the ProMariner 44020 ProSport HD Waterproof Marine Battery Charger, 20 Amp, 2 Bank. It's only $185 and a lot cheaper than the ProNauticP series. The 44020 doesn't have all the capabilities of the P series but it's less than 1/2 the price. I'm sure I won't be adding a 3rd battery or generator so the 3rd bank isn't important to me.

Thanks again.

Just to follow up, I did end up buying the ProMariner 44020 20A 2 bank charger for $185. The best bang for my buck. I like the fact that it has what they call "distribution on demand" so it can push up to 20A on 1 of the banks, if not needed at the time by the 2nd bank. I doubt if my 30-year old charger ever had that capability. I'll take out the 5A unit and use it to keep the batteries charged in my garage during the Winter.

Thanks again everyone for all the helpful advice. It's appreciated.

Final Update

Well, in case anyone is interested, here's my final solution. I went with a ProMariner ProSport HD20 - a 20A 2 bank charger. It has "distribution on demand" so it can put all 20A to one battery, if needed. Physically, it's about 4 times larger than the Noco Genius I replaced. I'll be using the Noco for my battery maintainer when I take out the batteries for storage this winter.

Thanks for all the help and info from everyone. I appreciate it.