Yes that was my original 24v unit. Normally it ran at 28vdc so 300A would be close.
With a standard power jack, you will do this for 12 seconds and it will beep and shut down...... not because the electronics can't stand it, but the transformers won't do that for long.... I ran that for testing, I now am back to 48v systems.... have 4 of them now, 2 power jack originals, and 2 powerjack control and power boards with serious transformers in the old grid tie boxes.
Nominally it is really only about 3kw continuous... after that it's programming protects it from excessive heat build up in the transformers.
The electronics are good, the programming is to safe for power users, as the transformers are too small for long run high power.
I build much bigger transformers capable of 8kw continuous out of old galvanically isolated grid tie units... they have very good torroids, that are rated and run at 3kw continuous all day with no cooling. I use 2 or 3 of them stacked and rewound for high power continuous. The failed/ broken aerosharps here are cheap I bought 10 x 1.5kw units for 400 dollars.... the cores are good for 2kw or so continuous...... The inspire ones (1.5kw) have 3kw cores in them, and so rewinding with 2 stacked, gives an easy 6kw continuous..... but you have to fool the current transformer by bypassing some of the current around it with a shunt. That way the thing will do continuous high power, rather than the 12 seconds.... you need a serious battery pack to do that though.
The surge currents are huge for starting stuff up... I mean huge.
If you beef up the transformers, 3-4kw solar grid tie is no problems, we have one here that runs 3 x 1.5kw grid ties every day.... BUT it requires the current shunt, and rigging the fan for continuous operation, as the computer will not see the current draw and so not turn the fan on until it is too hot anyway.
The electronics are good, and by beefing up the tranny, and current bypass and cooling, they will give the bigger name brands a very serious run for the money.
In their native state, they are excellent 3kw units, not 8kw units, although the surge is very impressive. Buying the 15kw control card for 45 dollars is a good lurk for those running 48v, it saves shunting the transformer, so the computer still does a good job with the fan control, but then best to upgrade the transromers, or they will over heat in continuous mode.... 15kw card is good for about 5kw continuous without modification.... the 15kw power board is electrically the same as the 8kw power baord, but physically twice the size to spread the heat better.
I have bought the 15kw power card as well, but have not bothered to press it into service as the 8kw with the changes is easily big enough to run my house including electric hot water unit... it runs the 15kw control card at the moment.
I have seen break down ( explosion of fets) caused by turning off the grid "shore power) while running the grid tie into it without a house load.
So AC coupling to shore power input I think has some further testing and blowing up before I can say for sure why that happened..... at least they mostly are easy to fix... if you fuse the input properly... then hopefully the fuse will blow during the fet meltdown, and the tracks up on the control card don't get cooked as well. If the fuse blows it will be just the fets, some gate resistors, the totem pole transistors and the 2 opto's, which are plugged in in the newer models........ sometimes it is just the fuse..
Yes i have done some truly horrible things to these unit to see what happens.... and sometimes because of simple stupidity.
They have never blown driving a huge load..... mostly with no load while I have been trying stuff I shouldn't......not too bright.
I will endeavour to answer questions on the board, not privately.... no one else learns anything that way.
.......oztules