Upgraded batteries, do I need a bigger battery charger?

[notlaw]

Hi there - I installed 6 of these, group 31 AGM batteries, 105 amp hours each. 4 on house side, 2 for starting. I also switched the house bank and starting sides so I could fit the 4 batteries on one side. And I upgraded the alternator on the house bank side to 105amp.

So, couple questions:

1. With switching sides, now my generator only chargers the starter batteries instead of the house bank. Where should I correct this in my wiring so it charges the house bank?
2. The boat comes stock with a progressive dynamics 40amp charger, but I believe the rule of thumb is 10-15% of overall amp hours. Do I need a bigger battery charger, or can I change the wiring from the generator to the battery charger to get more out of it? (might be a stupid question)

Thank you

Generator is a Koehler 5ECD

 

[Stee6043]

Six batteries and a generator? Your generator will eventually hate you for not running it enough...if it doesn't already

Your generator should only "charge" its dedicated battery directly via it's internal charging setup. The AC Convertor/Charger should have 3 banks if it's the OEM charger for your boat (assuming it came stock with the generator?). One for each side (port and starboard) and one to charge the generator battery. If you have the proper AC Converter/Charger it's likely not wired correctly if it's not picking up both banks plus the gen battery. It's pretty easy to tell if you follow the hot leads from the charger. Are there 3?

What model is your Progressive Dynamics charger?

 

[notlaw]

I have a very large stereo system, I use lots of battery!

My charger is:
Make: Inteli-Power
Model: PD2040
Input: 105-130 VAC 50/60 Hz
650 Watts
https://www.progressivedyn.com/wp-content/uploads/2017/04/PD2000MarineManual.pdf

Are you sure the generator shouldn't be charging the batteries while it runs? I thought that was part of its purpose

 

[Stee6043]

I have a very large stereo system, I use lots of battery!

My charger is:
Make: Inteli-Power
Model: PD2040
Input: 105-130 VAC 50/60 Hz
650 Watts
https://www.progressivedyn.com/wp-content/uploads/2017/04/PD2000MarineManual.pdf

Are you sure the generator shouldn't be charging the batteries while it runs? I thought that was part of its purpose

According to the manual that is a 3 bank charger. I'd bet you've got two leads from the charger going to one of your banks? Keep in mind that banks wired in parallel only need a single lead from the charger. Each battery does not need a direct charger connection in a single paralllel bank. They share.

The generators job is to put out 110V. Your charger is responsible for charging your battery banks. The generator is self-sufficient in that it should be charging it's own single battery as well, but nothing else. The 12V output from the generator itself would not be sufficient to charge multiple batteries.

I'd bet a dollar you have the right charger with the wrong wiring setup.

And on sizing, I believe the most critical factor in charger size will be wiring/breakers. If your boat came stock with a 40Amp charger it's not always as simple as just dropping in a 50Amp if you want more output. There are wires, breakers and the like that may/will be undersized for a larger load.