3 bank charger for 30 weekender

J

johngus

Member
Dec 27, 2008
248
Amity Harbor,NY
Boat Info
1988 300 Weekender
Engines
Twin 350 Chevy
Straight Inboards
Hello,my old blue 3 bank charger has died.looks to be original to this 88 boat so got the moneys worth.whats everyone else replacing with?was looking the promariner 3 bank 20amp charger.my old charger says 40 amp.is that 40 amps for each bank or 40 banks total.just want to ensure I have enough output when using shorepower and 12V accessories if the promariner will work for what I need.gonna have to stand on my head to replace as its in the front of the engine bay mounted to the bulkhead.any other good choices for chargers?
 
Likely its 40A total, which is typical.

20A for 3 banks would be a very minimum as that covers about a sum of 200 Ah in battery capacity. Which promariner series are you looking at? I would want with more amp output if you plan to you is as a power supply in a sense. The Prosport series is not ideal for this. Good charger for their price point, but not ideal for using to power loads.
 
I agree I would look more towards 40 amp for 3 banks as 40 amps is total output. Also keep in mind a power supply and battery charger are slightly different. I have the same battery charger on my old 34 sea ray and 41 sea ray. When i added a second charger for additional batteries I noticed the lights brighten as the charger turns on and brings the battery voltage back up to 14.4 to 14.8 volts. The power supply was fixed on at 14.8v consistently but current would increase as the demand went up. Some don't mind the light issue but it annoyed me.
 
  • Like
Reactions: QT1
I installed a Promariner 1230 P three bank charger on my 89 300DA this summer as one of the outputs on my old Charles charger quit. I find this to be a good size for this boat. It is supposed to output up to 30 amps per bank, in my case three batteries so it should be plenty. Has nice digital readouts and an optional remote for monitoring at the helm.
 
  • Like
Reactions: QT1
Just to clarify, the ProNautic is not a 90 amp charger, but has what they call distribute-on-demand. it can deliver its full 30A capacity on one bank, if needed.
 
Wylie_Tunes said:
Just to clarify, the ProNautic is not a 90 amp charger, but has what they call distribute-on-demand. it can deliver its full 30A capacity on one bank, if needed.
Click to expand...

That was how my Promariner 40amp worked. 40amps total spread across the 3-banks. It was really neat to watch the digital readout and see what it was doing. It was the best upgrade I ever added to our 260DA. When the time comes, I will add the exact same one to our 44DB.

Bennett
 
bbwhitejr said:
40amps total spread across the 3-banks
Click to expand...
in this case, your charger would only be capable of deliver up to 13.3V per bank. if all 3 banks were dead, it would deliver its total capacity of 40, or 13.3V x 3. Distribute-on-demand allows the charger to send ALL its output out on just one bank, if that bank was that low, and the other banks were not very low.

Both designs have their pros and cons, but are very different.
 
Wylie_Tunes said:
in this case, your charger would only be capable of deliver up to 13.3V per bank. if all 3 banks were dead, it would deliver its total capacity of 40, or 13.3V x 3. Distribute-on-demand allows the charger to send ALL its output out on just one bank, if that bank was that low, and the other banks were not very low.

Both designs have their pros and cons, but are very different.
Click to expand...

Correct, but it would favor the one that needed the most if that makes sense. The starting battery always stayed charged by the altenator so that left most of the juice for the 2-house batteries.

Bennett
 
Wylie_Tunes said:
in this case, your charger would only be capable of deliver up to 13.3V per bank. if all 3 banks were dead, it would deliver its total capacity of 40, or 13.3V x 3. Distribute-on-demand allows the charger to send ALL its output out on just one bank, if that bank was that low, and the other banks were not very low.

Both designs have their pros and cons, but are very different.
Click to expand...
How are you getting amps by multiplying volts by the number of batteries?
 
Just put in a promariner 13 amp charger 3 lead mainly to charge and maintain the three batteries I have on the boat. Two are engine batteries that also runs the house and the third is for mainly running an inverter for the fridge which uses about .1 amp per hour. I have a 2.9 amp solar charger to keep the center battery topped off when the charger isn't plugged in which will be most the time since I don't have overnight power at my slip. It will be interesting to see if it will be enough to keep the fridge going on a lower setting. The lead outputs are 5a,5a,3a, and they seem to be doing a sufficant job of keeping the batteries topped off even though it is a low amp charger. If your batteries are completely dead then you need to use a high output charger to get them back up to 12.6 volts.
 
I just installed a Promariner 1240 P on my 310. Two outputs go to my starter and house banks respectively. I plan on setting up a charge station for a dinghy trolling motor battery and wire that to the 3rd output.
 
The charger keeps up really well with all the batteries and with the fridge running and I just installed a second house battery so doubled my reserve, It also works well with my 50 amp solar charger and inverter as my fridge is 120 volt and is so far doing fine on a medium setting.
 
You must log in or register to reply here.

Forum statistics

Threads
113,112
Messages
1,426,288
Members
61,027
Latest member
NeilS
Back
Top