My new 24v->12v 40Amp inverter arrived late last week, so it was time to add it to the back of the 24v dist box alongside the 24v->13.8v 20Amp unit. I sourced these on Aliiexpress and am delighted with the results of some superficial tests. The 13.8v 20Amp unit had no difficulty delivering 18Amp to my IC-769Pro transceiver, with a voltage drop to 13.2v. Looking forward to loading up the 12v 40Amp unit.
I wanted these inverters to be isolated with the big switch on the 24v dist box, as well as protecting them with a fuse. So I drilled a 13mm hole in the front of the dist box, between the two input sockets, and installed a festoon fuse holder. So I now have a 30Amp fuse between the top of the 100Amp circuit breaker and three bullet connectors (one for each of the inverters and one for the rear Merit socket. - Now where is that white Letterset which I used 30 years ago to label my electronics project panels??
Unfortunately the bottom of the 100Amp circuit breaker broke (just fell apart in my hands boss!). It all still works and is held securely enough by the top mounting screw, but would be nice to replace with an intact unit some time in the future.
In the pic below, the aluminium heat sink on the left is the new 12v40A unit and on the right the 13.8v20A.