ok Justin, you should be able to handle this then.... it is simple stuff, and if it dosent work, nothing you will ever do will get it to go.... but i expect $30 or so worth of parts will do it.
We are not going to trouble shoot, just replace the active components in the out put stages.
We only need to buy the opto's ( on net)
then the two types of pnp and npn transistors
24 fets IRFP4110 ( less than a dollar each, I just bought 400 for less than a dollar each for a different project ( solar water pumping BLDC motors)
and 24 resistors.. I replace all the fets and resistors on the power board....no matter how well they test.. for the few cents, it is time well spent.
The circuits here http://www.anotherpower.com/board/index.php/topic,780.0.html
Will give you the part numbers for the transistors and the opto ( you will still be able to read that anyway, the IRFP4110 fets and the resistors 51r or thereabouts ( I have heaps of that size... so use it instead of the original 46 I think) the blown surface mounts are the 2sa1213-y and 2sc2873-y ( SOT89)
The little transistors will be the problem, as they have probably burnt the board and ruined it... but if you use a circuit drill to clean it up, you can re-track ( messily) and get it going... or you can use through hole ones, and use the long legs to some advantage.
equivalent through holes are 2sa1020 and 2sc2655... I think , 2A 50v.
After that it will probably work fine again.
Look carefully at where the fet legs go, there may be erosion between the pads the lands.
and thats it.
Disassembly and assembly will cost the most time.
Cut the legs off the fets, and take the legs out independently, and the resistors the same way is easiest by far. Double sided boards with large copper areas are hard to unsolder all at once... even with a sucker I think.
Generally thats all we have to do. I have seen the power supply chip fail, 3842 pwm chip,and some zeners on the high side power supply /s that drive the opto's.They will fail short if they are causing a problem, and test like a normal diode if not. .....
You should be good to go.... darn cheap to fix when you have to.
Also if its not something simple (like a nut bolt, lose wire, or short etc) I can't diagnose why something would blow up (like this one)."........... me neither. These things are terribly robust if used only as an inverter..... why that one blew.... I can't begin to guess..... and certainly under virtually no load... check for loose power wiring to and from the transformer and battery inputs.... even the input terminals from the battery, and battery cables to terminals etc etc.... looking for a spike.....
Just remembered, your fets are different... your are only 12v ones... take the numbers from them... irfp4110 are for 48v units... will do 24v too apparently.