Magnum inverter, Yamaha Generator

Jframpey wrote:
Sorry to be the simpleton here... I've been intrigued with the idea of load support from the magnum inverters, followed PT's previous posts re: it's performance, so I'm following this one closely.

PT, your failure occurred while using the converter section to charge from a generator? Shutdown the generator with no 120v loads? And poof - the magic smoke escaped? It remained connected to batteries with only parasitic 12v loads?

You are not a simpleton here. . . rather simply (no pun intended) being introspective. The “load support” bit that appeared in another thread is in fact intriguing but I did not pay attention to it. I'm glad that you caught it. Interestingly, I am following this just like you.
Now that you mentioned it again it gives it a red flag. It seems like OP is still trying to pursue it when someone alluded to autoformer.

Load sharing is unheard of, when two power sources of different formats like inverter and gas engine generator outputs being coupled.
This load- sharing scheme will work on generators with exactly the same mfg design, model and capacity and also labelled inverter with capacity in watts and the suffix “i”. Honda 2000i is a good example.
They can synchronize themselves automatically without problems. Even two different brands of identical size cannot be coupled . And to prove this point, if two generators are not designed for parallel operation they will not work. . . at the very best you can make them work as smoke signal. I can explain why they won't work but it's beyond the scope of what we are trying to accomplish.

Their design (inverter gen) is totally different from generic or traditional generators. While generics make power directly from the magnet coils on both stator and rotor (some with permanent magnets) are delivered unmodified to the connected load; on the other hand, inverter type generators make power by making 12 volt first and then transformed to 120 volts.

This scheme makes it easier to couple two generators by controlling the low side (12 volts) before it gets transformed into 120 volts.
OP is trying to parallel two power sources namely: Magnum Inverter and Generator. This an absolute no no.

First of all, the generator power is fed to the bus of the load center (panel). Then the power from this bus goes to the converter where 120 volts is converted to 12 volts via step down transformer and rectifiers to provide power for battery charging and also power for 12 volt appliances.

Since this power for charging the battery comes from a different source (the generator), everyone is happy. . . but far from being synchronized with the inverter, therefore cannot be coupled.

The problem arose when OP tried to operate the inverter while the generator was still providing power to the bus. These two different power sources are jockeying for a place in the same bus. Someone will scream “there is a transfer switch to separate the two”.
Fine, but you still have shore power conductor that occupies a terminal in the transfer switch. You can have two but not three. (Inverter, Generator and Shore Power).

To prove the above statement OP said on this thread:

I shut down the inverter portion. (Obviously inverter was on )

Then I turned off the generator. (Obviously the generator was also running )

The Magnum remained connected to the battery bank. (Charging operation was still active. Charge current at 74 amps coming from converter. Where else would you get it from.)

This is what cooked your Magnum. Consider yourself lucky if your converter is still functional.

So, we can deduce from the evidence that OP was trying to operate both inverter and generator expecting a load sharing strategy. . . which I say, no possible way based on unsound practice that we've seen above.

However, all is not lost and OP's goal can still be accomplished, but it won't be easy and you can not unfry what's already fried.
Perhaps may even be more daunting for a simpleton like me. Cheers. :-)
Thanks for your time.