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About Marv

  • Birthday May 2

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    Cape Town
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    Electrical, electronics and bacon....not necessarily in that order.

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  1. Version V0.0 Initial Draft Release


    Axpert MKS-4000KS-5000 Service manual V0.0 Initial Draft Release Please Note; This is not an owners manual or an installation manual. It is pitched at readers with good basic electrical knowledge who need to troubleshoot or fault-find an Axpert Inverter. This manual is for Axpert MKS 4KVA-5KVA series, it can help service personal perform the basic maintenance and repair service. This manual focus on the service, so you should get the basic operation of the Inverter/Charger from the user manual, and make sure you had read and understood user manual before you use this service manual. The manual include 8 sections, as follows General Information, this section show you the general information of the service manual Functional Block, this section show you the major functional block of the Inverter/Charger Working Principle of the major Functional Block, this section show you the major functional block Function explanations for each PCB, this section show you all the PCBs of the Inverter/Charger Interface, this section show you the LCD interface, include display and setting Trouble shooting, this section will give you the way to find the trouble Test step ,this section tell you how to test the Inverter/Charger after you repair the unit Electric Specifications, this section show you the basic electric specification of the Inverter/Charger
  2. Marv

    Axpert Repairs.

    Thanks for the helpful replies, much appreciated. Thanks also for the service manual, I must admit to already rudely grabbing a copy the day I joined. I think more detailed info would be helpful so I had a rummage around some FTP servers to try find some component level boardview pdf's but nothing so far. I posted a few requests on the Chinese servers the reside in the shadier corners of the interwebs where you mention the word 'bitcoin' and anything can happen; being an optimist i'm confident something will turn up. Even without full schematics I think there's some entertainment value in this repair so I'm going make it a project when time allows. Unfortunately there's several other priority items being resuscitated on my healing bench at the moment so it will only be in a week or two. Thanks again for the replies, I'll keep you posted.
  3. Marv

    Axpert Repairs.

    I've dabbled on and off with inverter repairs over the last 6 or 7 years (mostly Victron and Solaredge) so this isn't my first rodeo. I currently have a 6 year old 2kva Axpert on my bench and alas it appears one of the Mosfet's on the DC-DC converter took something of a dump. The mosfet is blown wide open and there's splatter on the board and plenty of smoke staining in the surrounding area and generally all over inside the enclosure. Unfortunately I don't have schematics for the board so before I tidy it up fit a replacement component I wondered if anyone has past experiences of Axpert repairs. Has anyone any experience in suitable n-channel alternatives to the IRF1407 mosfet's? What is the usual failure mode when this particular inverter blows a mosfet? Is there likely to be collateral damage The input voltage is 24DC, what kind of output bus voltage would you expect to see? Looking at the push-pull Tx I was guessing around 350...maybe 400v? Any info and any past experiences would be greatly appreciated. Thanks in advance.
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