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Thanks. That is what I thought. I will check to see if I have a D+ available when I get back to the boat. If not, perhaps I'll use the ignition key to trigger the relay.

I am not sure if this thread has been abandoned, but since I also have a Hatteras (58MY), I thought I would chime in. Are you sure about the AH in your current 32 volt battery banks? Most Hatteras 53s have (4) 8 volt, 8D, 250AH LA batteries, wired in series to produce 32 volts, at 250AH in each...

Does this mean I will need to install some method of turning the MPPT off when the engines are not running, otherwise it could draw my 32 volt bank down to the 26 volts?

Thank you both for all the information. It is very helpful. My alternator puts out a maximum of 60amps. I was thinking that a charger capable of, or set at, 30 amps or less to protect the alternator. If I use an MPPT, like the one mentioned above, would my 60 amp alternator damage the MPPT...

Thank you for the response. If I used converters like those would I need to monitor the batteries state of charge, and manually disconnect the converter or do you just set them to the float voltage and let them run? There seems to be such a big price range in Dc-Dc converters, ranging from...

Thanks. I understand now. You guys have been very helpful. Great forum!

Is anyone aware of a way for me to charge my house bank (24volt Lifepo4) using my alternators (32 volt alternator and 32 volt starting bank) while underway? I have seen B to B chargers that do this, such as the Renogy and Sterling, but I have not found one that handles 32 volt input. My backup...