Battery chArger size

[MV Mystery]

My charles industries 40amp charger is starting to act up. I may need to change it, but they apparently no longer manufacture marine chargers.

Would you think a 30 amp charger or even a 20 Amp would be sufficient?
We run generators 100% of the time aboard and only use my 24v bank ( that supply house and engine start) for the vacuflush systems and a few other minor accessories. I’d like the charger to handle starting the engines from a weak bank if need be.
My setup is 2 pairs of 8D batteries per Detroit diesel supplying some house and starting of main engines.
( my 12v generator bank is separate and run other shower pumps and minor lighting etc)

I’ve never seen my charger at 20 amps on the gauge in all my years with regular usage.

[Cricket]

I would not cut back on the output amps, you may need it some day.

[Boatsb]

It's based on battery bank size.

I'd not go smaller. A simple formula is 10 hours to charge or less.

So 600 cca needs a 60 amp charger.

[rustybucket]

We put in the 45a Analytic systems smart charger. At the time, this was the largest capacity smart charger I could find. The thing is a beast and will hopefully lead to extended battery life.

Probably picked up 2knts on weight savings along lol.

[MadHatter53]

I'm planning on replacing my " lamarsh" charger this coming season. It works fine but it is OE and want to upgrade to new tech for my old 32V system. I haven't found many 32v chargers with good or any ratings. I saw the analytics systems and it seems tiny compared to what I have. Not trying to hijack the thread I didn't want to start another about chargers etc.

[rustybucket]

I'm planning on replacing my " lamarsh" charger this coming season. It works fine but it is OE and want to upgrade to new tech for my old 32V system. I haven't found many 32v chargers with good or any ratings. I saw the analytics systems and it seems tiny compared to what I have. Not trying to hijack the thread I didn't want to start another about chargers etc.

When comparing chargers be sure to compare amps apples to amps apples, the analytics charger is rated for 45amps continuous (going off memory here on the number so don't quote me). Many of the other chargers stated higher amp rates but not rated for continuous use. If you dug and found their continuous rating it was far lower than the analytic.