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AndrewM314

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  1. Hi, I'm just wondering if any of you experts know whether it is possible to increase the battery charging voltage on an Axpert MKS ii, currently the maximum charging voltage is 64V, but I would like to increase it to 67V, is this possible. Thanks Andrew
  2. Thinking about it, Kalahari Meerkat may have the solution going through an isolation transformer, I could probably step down from 240v to 110v which would give me around 156vdc not referenced to anything, which would surely be the same as the output of the panels
  3. thanks for the reply, that's actually how I'm using it at the moment, but I wanted to stop importing from the grid to the batteries and only use excess solar that would have been exported. Due to the cost of importing and the lead acid batteries only being 70/80% efficient. Capturing excess energy pre generation meter I would lose 20/30% of the feed in tariff due to the efficiency of the batteries.
  4. Due to the excessive KWH price, I want to reduce importing from the grid and exporting from my solar system to the grid. I have 4kw PV array going through a grid tied Sunny Boy inverter which feeds through a generation meter generating the feed in tariff. So I want to use a solar Immersion heater booster to dump any excess solar power into some lead acid batteries rather than export it. Then I can use battery power overnight to reduce importing. I was thinking of putting a bridge rectifier and a large capacitor on the output of solar Immersion heater booster and feeding into the PV input of the Axpert.
  5. Hi, Does anyone know if it's possible to input rectified AC into the PV input on the Axpert MKS ii. So the rectified AC would probably be around 300VDC smoothed, the issue I'm concerned about is that pv- would be essentially be connected to neutral. Thanks Andrew
  6. I managed to repair this unit by changing the two faulty IGBT's, it's now working ok and I have just connected via WiFi, the unit ID is 5535553..., Which I think I've read before is another pointer to a fake unit, is that correct.
  7. After reading the above post everything appears ok except that it doesn't have the little date label. Also I've Just noticed it doesn't actually have Axpert in the model name. Does this sound like it could be a fake inverter.
  8. Thanks Coulomb for the explanation and diagram, looking at this diagram and the hfpw diagram it looks like one side of D20 goes to ground through the windings of TX7 and the other side of the diode goes to ground through the windings of TX9 so it makes D20 look like it's short circuit but in actual fact I was measuring the very low resistance of the windings. So hopefully everything should be ok, just waiting for replacement IGBT'S to give it a try. Out of interest with my diode being numbered D20 instead of D40 could that my inverter could be a clone?
  9. I've attached a picture of D20's location
  10. Looking at the IGBT circuit again the emitter short is ok, it connects to the negative side of the DC which is correct . The only other anomaly is D20 is short circuit, I removed the diode to test it and the diode is ok, anyone know what D20 does?
  11. I've checked all the components around the high side gate driver all seems ok except there is a short circuit between QC1 emitter and QD2 emitter with all the IGBT'S removed, that doesn't seem right?
  12. In the service manual it shows the par board to the left of the mppt board. Is that board usually known by another name
  13. Quick question can the main board be tested without the mppt board and par board connected?
  14. They are actually the IGBT's QA1 & QC1, so do you think I could use any IGBT as long as they are better than 75A/650V and would I have to change all 4 if I'm using different devices or wouldn't that matter
  15. Thanks very much for your help Coulomb much appreciated. I'm trying to find a replacement for the faulty components the number on the device is ost75n65hm but I can't seem to find one anywhere, anyone know where I can get these or an alternative, thanks
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