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AlexCape

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  1. Please correct me if I am wrong.. There are 2 issue here? One is to protect you from the PV voltage generated, should there be an electrical fault and you touch something live. Two is protection from lightening. Re (One), I think there are no requirements if the DC voltage is below 110v. I have used multiple strings with the lowest voltage possible to allow the 48v inverter to work efficiently, when the battery charging voltage needs to be the highest. A 72 cell panel in series with a 60 cell panel gives an OC v of less than 90v, and at max power still around 70v, more than 10v above max battery charge voltage (lead acid) which is sufficient. Playing around it seems 6v is required between PV voltage and battery voltage for efficiency. If (One) is addressed, and there is no connection whatsoever to the grid, then (Two) is pretty much voluntary?
  2. Hi Ertjie. As it happened a friend of a friend who is a professional electronics technician, as well as a recluse, fixed it. He said there was a minor issue and replaced some small inexpensive components, sorry can't tell you more at this stage.
  3. If your batteries do not charge properly you could increase the float voltage. Setting a lower maximum charge current could also help, since the actual amperes going into the battery at bulk charge voltage versus the maximum charge amperage setting may affect when switching over to float occurs.
  4. Hi Coulomb, thanks. yes that makes sense. I started groping in the dark, I have limited electronic knowledge but came across an SMT diode, D51, that reads the same both directions in CCT, 20.4 ohm and 0.018 V on diode tester. That probably does not seem right. The other components around it give plausible readings. Will follow your links. BTW I also like 2 panels per string, to keep DC voltage below regulation. I found I get really good results using a 72 -cell in series with a 60-cell. Two 60-cells would be too low.
  5. Ok, plea for help. Am entirely off grid, and had to rush out to get another smaller hybrid system to tide us over. But now need to fix the Axpert 5k. Has anyone got a cct diagram? Or knows where to get? I opened the box and not even sure which relay it is that does the clicking. I suspect that the unit wants to kick in, relay operates, but there is not enough holding current for the relay, so it keeps on dropping out. Running off large Lead Acid and didn't allow them to discharged, it's definitively not the batteries or batter connections. The 3kw replacement unit operates fine.
  6. I experience the same clicking. Battery pack Lead Acid, 460ah at 50.2 volts. Have disconnected the solar array, this makes no difference. Could there be a problem with a power supply that powers the relay?
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