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Beat last won the day on October 22 2020

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  1. I wonder if somebody else has made such experience.
  2. Thank you for your response. I stated: "01: SBU, 26: 53V, 27: 52.5V, 29: 42V, 31: SbE." Setting 31 is the solar balance. It is set to ENABLE (default). [Quote=Coulomb]"Two: what is the voltage of your panels about an hour before noon? Maybe the voltage is too high, and the warning doesn't get transferred to the master. As I type this, it doesn't seem likely, as power limiting happens in the solar charge controller."[/Quote] The voltage of my panels remain between 100 and 110V at full power, confirmed with my multi meter. It raises to 129V at full sun with no load. It is as a mat
  3. In this configuration they work well. Lately I had a complete shutdown because of load shedding as reported in another thread. When restarted this time the older unit with the PVs connected became the master. In this configuration it repeated the bad behavior when batteries are full in the afternoon. It disconnects the PVs and reconnects them only the next morning unless I disconnect and reconnect them manually. I thought that this has to do with the master/slave configuration. So I shut them down again to eventually restart them in the original configuration. On the following sunny day I obse
  4. I understand that MC4 connectors are designed and made for outdoor use. They don't make sense indoor. The installer of my PV panels used the factory fitted ones only for interconnecting the panels in series. On the feeder ends he cut them off and spliced the extension wire with insulated crimp ferrules in such a way to them that the splices got inside the roof.
  5. I have set my battery cut-off (29) at 42V, the back to utility (12) at 47V. The battery data sheet says the BMS cuts off at 40.5V, corresponding to 0% SOC. Lately after 3 rainy days and during load shedding at night the system shut down completely although I thought to have some 20% SOC left. I had to restart it from scratch when power was back. Therefor I increased the back to battery (13) from 49V to 50V. This way I get more battery charge before it switches back to battery mode.
  6. Very interesting! What software do you use for this? I would like to do similar things. Would also like an interface to the Geyserwise to turn on the electric geyser heating when surplus solar energy is available and the batteries fully charged.
  7. I had my communication board grilled when I connected simultaneously the Axpert(Synerji) RS232 and the Batteries BMS RS232 communication lines to the same computer. I found out the hard way that their ground references have about 10V difference. I would need an opto-isolator on at least one line. Actually I use 2 different laptops. In order to prevent spikes or radio interference to enter the devices I equipped the lines an both ends with ferrite cores.
  8. this is a tricky one. First determine whether the 3-phase motor is directly fed from the line by a smooth starting provision or if it is variable speed controlled by an electronic variable frequency control. In the first case check if the phase sequence is correct. You may change the sequence by interchanging two of the 3 phases at the inverters connection to the system. Or you may change the phase attributions of the inverters to P3-P2-P1 instead of P1-P2-P3 in program 28. In the second case the phase sequence should not matter. If it is a ripple problem you might solve it by conne
  9. There is one thing however you must pay attention to: If the electric stove is in single or 3-phase connection. You find this out at the DB. If there are 3 breakers for the stove, then it is 3-phase connected. It then is most likely wired with 4x2.5mm². Simply connecting the 3 phase wire together to single phase would risk to overload the neutral wire. There are 2 possible solutions: Ether you pull in a stronger, 4 or 6mm² neutral wire. Or you connect 2 and 2 of the 4 wires together, i.e. blue and black together for the neutral and red and white together for the phase. You also would have
  10. Axpert (Voltronic) has 3kW inverters. 3 of them can be configured to a 3-phase system. That would make a total of 9kW. What I don't like about them is that they are built for 24V battery. With 9kW potential power that implies a terribly high current on the battery. I would rather use 3 4kW units with 48V battery. But I would suggest to think about rewiring the DP to single phase and use only one phase from Escom for backup. I suspect that you pay extra monthly fee for 3 phase. R2000 per month seems to me very high. Enduring the admin hassle to reduce to single phase may well pay off in th
  11. Beat

    Grid tie basics

    Thank you for your remarks. The first one is correct. The second remark surprises me. I have never and nowhere seen billing the apparent power in kVA. As a matter of fact the meters are (must) be designed to meter only the active (resistive) power in kW. In the countries I know it's a legal requirement. The utility companies may however have agreements specially with industrial customers to additionally meter and bill the reactive power. Special meters are required. Remark: The apparent power is the combination (vectorial sum) of active (resistive) power and reactive (pure inductive)
  12. Beat

    Grid tie basics

    There seams to me a lot of whaotwhao between power and energy. I give you a picture: The power of the engine of a car determines how fast you can go uphill with it. But the fuel content in your car is the stored energy and determines how far you can drive. Electric power is measured in Watts (W, kW) whereas energy is measured in Watt-hours (Wh, kWh). What you buy from your utility is electric energy in kWh. In order to size an alternative electric power system you should look into your electricity bill. The bill lists the amount of kWh you have consumed. Devi-de this amount by the number of d
  13. I think the latter is the case. Normally a company puts in the product label of its own brand product its brand name first. The way its written in this label: "Model Name: Synerji 5kVA/5kW 80A" below the title "INVERTER CHARGER" tells me that apparently Voltronic is manufacturing and selling this product for other brand names such as Axpert and Synerji, perhaps even others.
  14. Interesting experience: The two MKS 5K work well together in parallel mode. I programmed the second unit exactly the same as the first one. When commissioning the choice of master and slave is done by the units themselves arbitrarily. In my case the new unit has become the master. All my solar panels are still connected to the older unit that has become the slave. The master unit works without panels solely from battery. Now we head two miserable weather days such that the batteries got almost emptied. Switching a heavy load (Geyser) on provoked the inverters to switch to utility by
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