Sass Posted March 6, 2020 Share Posted March 6, 2020 (edited) Hello again. A friend had his inverter fail last weekend and asked me to post a question here. It's an Axpert 5KVA-PAR-A inverter. Everything else works but he traced the fault to a small part on the board. Unfortunately it is impossible to read the number on the part as it is so tint The board part number is 16-500483-06G-(A) The item in question is the small black chip in the center of the board photograph MARKED u18. The number I read off it is VTI but we have no idea what this is. Could anyone assist with what this part is, and/or where to find a new charger board? Is there a repair manual for this inverter somewhere? Thanks a lot Edited March 6, 2020 by Sass Added a question Quote Link to comment Share on other sites More sharing options...
Coulomb Posted March 6, 2020 Share Posted March 6, 2020 (edited) 16 minutes ago, Sass said: The item in question is the small black chip in the center of the board photograph MARKED u18. The number I read off it is VTI but we have no idea what this is. VTI will be the "marking code"; they can't fit a readable part number on SMD chips, so they use these codes. According to s-manuals.com, the only SOT23-5 part with a marking code starting with VT is this Low DropOut voltage regulator: http://www.s-manuals.com/pdf/datasheet/r/t/rt9198%2C_rt9198a_richtek.pdf Unfortunately, the datasheet doesn't give a table of marking codes for the various voltages. You might be able to find more convincing matches from other marking code web pages. You should be able to buy a replacement Solar Charge Controller through the company that sold you the inverter-charger. Quote the board number, and the serial number of the inverter-charger (9293...). That's a really old 50 A charger, which they may no longer still manufacture. A few months after that machine was made, they went to 60 A chargers, and a year or so later to 80 A. Edited March 6, 2020 by Coulomb Fixed link to Richtek datasheet. Quote Link to comment Share on other sites More sharing options...
Sass Posted March 6, 2020 Author Share Posted March 6, 2020 Thanks Coulomb. I knew you would come through yet again. Anywhere that I can buy the board in the world as it's not available in RSA? Quote Link to comment Share on other sites More sharing options...
Coulomb Posted March 7, 2020 Share Posted March 7, 2020 18 hours ago, Sass said: Anywhere that I can buy the board in the world as it's not available in RSA? You could try contacting the Ebay store Maximum Solar and General Goods. They might be able to sell you one. Failing that, you could ignore the internal Solar Charge Controller and use an external one. Quote Link to comment Share on other sites More sharing options...
Sass Posted March 8, 2020 Author Share Posted March 8, 2020 Thanks Coulomb. Checked and could not find that eBay store. Pity..... Quote Link to comment Share on other sites More sharing options...
Coulomb Posted March 8, 2020 Share Posted March 8, 2020 1 hour ago, Sass said: could not find that eBay store. Dang. Maybe it's an Australian only thing. http://www.ebaystores.com.au/Maximum-Solar-and-General-Goods Quote Link to comment Share on other sites More sharing options...
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