Re: [electricboats] Two voltage battery banks on one charger

There is a company in the UK that makes a generator starter when the battery voltage drops below 11.8v the gen set turns on and turns off at 12.8v or so.  All automatic.  I have one but never installed it. Cost was about $75 with a waterproof enclosure.

CaptainJohn49 

On Sep 3, 2020, at 16:00, sw via groups.io <v1opps=yahoo.com@groups.io> wrote:

 Mppt charger maybe cheaper 

On Thursday, September 3, 2020, 14:43, damonalane <dlane@posteo.net> wrote:

I would go with the DC-DC converter as the simpler option, assuming you can buy one that steps down that far: 72V to 12V or 24V. That's how mine is setup, though my motor only needs 48V. I'm guessing with the proliferation of higher voltage motors that converters are available for those systems.

To use another solar controller, wouldn't you need another solar array? And to figure out how many watts of solar panels to give to each controller? With one controller you can put the solar where it works best. Let the controller control all of it, and let voltage flow "downhill" through the DC-DC converter.