Other 12V Sources with a 24V-12V converter

BFL13 wrote:
One thing not mentioned IIRC is that some (many?) solar controllers have a positive ground. That doesn't matter when you don't ground your panels as with an RV installation. I have no idea, but might that be a problem when using a pos grd solar controller supplied with a typical DC-DC? ISTR your 24-12 is chassis grounded? Not a clue, just mentioning it.

Thanks for the caution. Just checked:

Rogue wrote:
The enclosure of the MPT-3048 is floating with respect to all circuit voltages and may be used with either negatively or positively grounded systems. It may also be used with systems in which neither negative nor positive are grounded, as allowed by NEC 690-41 for systems of less than 50 volts.

Will bear that in mind with any future PWM controllers.

And I just placed an order for the Meanwell RSP-500-27.
It's adjustable output V is 26-30VDC, with max 18.6A

Perhaps set it up to something around float V (~26.5V), and, as suggested, use the 24/12V converter all the time for the 12V systems (and forget the 120VAC/12VDC converter).

When needed I can boost its V to 30VDC to help the solar refill the batts after a rainy spell when I get to shore power.

(Will wait on the PWM and extra solar till next year, maybe.)

The Meanwell has an interesting remote control function across a couple of pins:
0-0.8V turns it ON
4-10VDC turns it OFF

And the Kisae inverter has a 5.1V USB port. Perhaps that port can be used to turn Meanwell OFF when boondocking and using the Kisae to provide 120VAC? One less thing to worry about if it works.