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Power Me

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Power Me last won the day on November 21

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  1. When did SunSynk come onto the market? I don't recall seeing them when I chose the GoodWe 21 months back.
  2. Cool. As you can see from my plots above, I am essentially off grid too, except I have a prepaid meter connection as backup for those prolonged overcast days and for deep cold winter days when I heat more than my PV can supply.
  3. Note that if the cut off is set at 40% SOC then the inverter will cut off when the battery SOC falls to 39%, the battery can then self discharge (and a little power goes to the GoodWe too) to 38% by the next morning.
  4. I can only assume you must have endured a municipal power loss too? The GoodWe (of which I am no Evangelist) has 2x battery SOC cut off limits. The 1st cut off is for when municipal power is present. The 2nd is for when municipal power is not present. The 2nd automatically gets set to 10% lower than the 1st, when you set the 1st. If you set the 2nd to some other value, you must set it after setting the 1st value.
  5. Hi Hagu13. I have been running Pylon us2000b(x4) + us3000b (x2) for around 20 months now and my battery bank currently reports a 98% state of health (SOH). If this rate of degradation remains linear then after 10 years, theoretically the battery bank should retain 80 to 90% SOH. For the 3 months of winter I drain my battery bank down to 30% state of charge (SOC). I stop at 30% as I cannot fully charge the battery bank from PV the next day if I go any lower. If I had more panel power I would be comfortable taking the battery bank down to 20% daily for the 3 months of winter. Du
  6. Recovery or Release, that a good thought, thanks for this.
  7. Thanks for this info. What battery state do the parameters with the "R" appended at the end refer to, or when to do they become applicable? For example; High Voltage = 53.9V but high VoltageR = 52.5V I have just had a thought, that perhaps parameters with "R" appended are for reference or are perhaps recommended safe values? (ie non "R" = marketing supplied and "R" appended = engineering proposed limits )
  8. If I owned an EV (and I do want a "Volvo XC40 Recharge" and I do still have my many years old Tesla M3 deposit still in place) I would be charging it at home. I am not sure why there are no DC "fast" (they don't have to be fast, just DC) chargers for home PV owners as they would be so much more efficient, than the process of converting PV array to AC and then AC back to DC battery charging in an EV, and certainly if/when I can afford an EV I would investigate this DC charging possibility. My preliminary investigation revealed that actual data communication would be necessary with the EV ra
  9. That is my thinking too. Wanting to eliminate the accumulated effect of mini charge discharge cycles on the battery by rather varying the geyser load. And to leave spare capacity in the inverter for a human in the home to randomly switch on a load such as a kettle and not trip the inverter that will be running off grid
  10. That's exactly the kind of error I was concerned might be thrown up by the inverter. Haha Do you perhaps know if the Axpert inverters use iron core magnetics in their inverter topology? I generally can. I use "Home Assistant" for my home automation and currently use SonOff devices to make sure I don't run either of 2 geysers or pool pump or bore hole pump at the same time. I also use inverter aircons and fridges so no large power spike from those items. See attached typical load profile for a 24 hour period. One can clearly see the blocks of geyser consumption which I want to smooth
  11. Feeling emboldened by your comments, Youda, I have just performed a quick basic test. I grabbed a 2.2kW fined oil heater and stuck a 24A 400V diode in series with it. Disconnected my inverter from the grid and ran the load without any complaints (odd sounds) or odd "DC offset" errors from the inverter. I have no doubt an old school inverter with internal large magnet transformers will not like this kind of a load, but the modern high frequency switching inverters like the GoodWe don't seem to have any issue. This kind of set up would provide a very simple and low cost 3 step (0%,
  12. Electronics design is more than a hobby it is my career too. Thanks for confirming your test results. Running completely off grid (incoming breaker in open position) is my end goal too. I am kind of tired of paying for the (1 to 2)kWh/day that leaks back and forth through the pre-paid meter as the GoodWe attempts to achieve 0 export. The pre-paid meter obviously has been configured to meter feed into the grid as if one had fed the power off from the grid and so the only way to achieve true 0 consumption is to sever the connection completely, but obviously cloudy days happen and the c
  13. Thanks for your quick reply, @Youda Very encouraging that you have successfully tested ~2.7kW phase angle switched load on a single 5kW inverter. Can you confirm this single inverter was running off grid at the time of the test and not in hybrid mode (grid assisted)? I personally would have guessed worst case would have been switching the load on mid cycle (peak inrush current) for 50% power delivery. I am running a GoodWe 5048D-ES which practical testing has confirmed is good for 5.4kW with grid present and 4.6kW running off grid. I want my geysers to heat even during load sh
  14. Hi Youda Thanks for sharing your experience on this forum. I am planning on converting my geyser loads to variable loads too, the amount of power going to heat the water would vary based on current solar radiation, current household load, and battery bank SOC. I have been looking into designing the equivalent of essentially a solid state variac so that I can ramp the AC voltage up and down to control the power going into the element. I figured it would need to be done this way as I expected the inverter would not cope with a heavy phase angle switching load of 3kW on a 4.6kW i
  15. I am running a Goodwe GW5048D-ES with 5.6kWp PV panels and 16.6kWh Pylon battery bank. In the spec sheet for the inverter it documents that; the unit can supply 4.6KVA backup power (6.9KVA for 10s) with grid connected the unit can supply 5.1KVA In practise though, with the grid connected and the inverter running at 53Deg C I have seen the unit happily supplying 5.4KVA for over 30min without drawing on the grid.
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