January 15, 20233 yr Hi, I am attempting a repair of a Mecer inverter (board 16-500449-01G). The inverter bridge is blown (QA1,QC1,QB2,QC2). Adjacent to the IGBT optoisolator driver IC's are diodes D44,D4,D45,D7,D8. these appear to be two diode packages with common cathode. Does anyone have any idea of their type number? Also is Q32 a MOSFET or IGBT and its type number.
January 15, 20233 yr 3 hours ago, michaelkh said: Mecer inverter (board 16-500449-01G). What model is that? Just to save time. On the 5 kVA models, these are BAT54 dual diodes, marking code L4. As per this traced schematic. It could well be the same for the 8 kW and 11 kW models. Edit: Quote Also is Q32 a MOSFET or IGBT and its type number. Again, in the 5 kVA models, it can be either a high voltage MOSFET or an IGBT. See the service manuals for the part number, or lookup the markings on the old transistor (if readable). Per the traced 5 kVA schematic, one part number is STW45N60 . This may however be different for the high PV voltage models, which is most of them these days. Edited January 15, 20233 yr by Coulomb
January 18, 20233 yr Author Hi Coulomb, the model I have is a Mecer SOL-I-AX-5M, rated 5000vVA/4000W. South African branded Axpert. Thanks for the pointer to the schematic, that was a tremendous help. There are minor differences in that my unit has a single semiconductor (Q32) in the buck circuit, whereas the schematic shows two. However I can now work through and identify the faulty components. Regards
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