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RobN

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  1. @Vassen, Neat! It might be the solution for me. Did you cable-tie the relay to the DIN rail? Although the OHM is supposedly identical to the SunSynk, it isn't and is more like the Sol-Ark sold in America. There are no ATS240 pins that I can see (see attached picture) and the software is of the Ingwe / Deye type, which I have not yet seen any support or upgrades for. Currently, I have a permanent Neutral-to-Earth bond in the inverter; as I feel that this is safer than a floating Neutral. I am 90% in "off-grid" mode and only need the relay when needing the grid during days of no / little sunshine. Thanks for the input, but it looks like I will need to take the signal from the grid. Keep safe and regards, Rob
  2. The only difference that I can see, (there are some hardware differences with my OHM), between SunSynk and their brand clones is in the software interface. SunSynk uses the same software as Sol-Ark in the USA; whilst OHM, Ingwe and Deye use a different but similar and I think more intuitive interface. However, the SunSynk interface appears to be better supported and has had software upgrades with some improvements (including a software option to use the GEN signal for a Neutral-to-Earth bond relay when in "island" mode) and has an active forum on their website. I have not located such activity for the Deye, Ingwe or OHM brands. I have the OHM 8kW inverter and am very happy with the way it's performing, although mainly in off-grid mode (CoCT requirements if inverter exceeds 3,6 kW with a 60A main breaker).
  3. Hello @Vassen, Interested to know how you got on with that relay from Communica? The suggestion by Halcyon is a neat solution, but I noted that the Axpert grounding box is only rated for 4,8 kW; so not sure how safe it is using it for my 8 kW OHM inverter. Regards, Rob
  4. @Halcyon I have the OHM 8 kW inverter which I run mainly in off-grid mode, but occasionally need grid power to charge batteries when the weather is not co-operating. After reading about the issue of neutral - earth bonding, I tested my setup in off-grid mode and found V readings as follows L - N = 244, L - E = 50 and N - E =18 (On-grid it's L - N = 244, L - E = 230 and N - E = 1). Testing the E/L unit (button on the E/L) in the downstream DB, it trips as expected, both off-grid and on-grid. To me it appears I have the floating neutral problem and was wondering about how you connected the Axpert earthing box relay you mentioned to the inverter, and where did you get it? Regards, Rob
  5. I have bought from ArtSolar on a number of occasions. Excellent service and very fast delivery, IF they have stock. My original deliveries were delayed because of the general Covid 19 lockdown, but that was hardly their fault. Delivery costs are calculated before checkout, so you can check. Strangely, you can save a fair amount in delivery charges if you order the panels in small batches (3 was the best in my case - came to about R540-00 for 3 panels delivered to Cape Town, 4 panels was double that. I think it goes on weight and if you exceed a certain weight then you are at the next level with an exponential increase in cost). Panels are working fine and delivering the expected power. I supported them as they are a local manufacturing company that actually produce a quality product. Only time will tell how they fare for longevity, but they provide a very decent guarantee / warranty.
  6. Dear Forum, Slightly off topic, but a question of compliance (please move to more appropriate forum if required). Is it compliant if the earth leakage unit is wired unconventionally with the LINE from below and the LOAD to the circuit breakers from the top? The E / L is non-polar (does not stipulate a LOAD or LINE side) and is tripping as expected with earth faults. Browsing the internet, it appears not to be a problem (provided the unit does not stipulate a LINE / LOAD requirement); but would it be compliant and could a CoC be denied for this reason? Thanks for a great forum.
  7. Halcyon, I read your other post in connection with your 5 kW Sunsynk inverter, but must admit that my setup has only just gone on-stream and I have not delved too deeply into the inverter settings yet. At the moment it is purely in UPS mode and appears to be functioning as such. The readings on the inverter appear to correspond to the usage meter I have connected (also an Effergy) Also OHM, although the same as a Sunsynk inverter, has a slightly different user interface and will require some puzzling out as I cannot find an OHM manual, only the Sunsynk one. Rob
  8. Halcyon, Thanks for the reply. CoCT, in their wisdom and the way I understand it, won't allow the inverter AC grid feed to remain connected to the main supply, once the solar panels are installed. If the system is to be classed as "off grid", it has to be completely isolated. If there was a changeover switch, then the PV cells could be disconnected and the grid-feed reconnected on non-productive days and the system would revert back to being a UPS (it might require changing the inverter mode). I do not believe that my system will be permitted to operate in "Grid-tied with no feed-in" mode, as the inverter (on the CoCT approved list) exceeds their limitation (although neither the solar panels nor the batteries will initially be able to exceed 3,5 kW). I have a 60 A main breaker on the DB, although it appears that the supply point breaker is 80 A single phase; which implies either a 3,5 or 4,5 limit. I agree that "Grid-tied with no feed-in" would be first prize, and once operational I may well jump through the hoops to see if they will permit it; but in the meantime I am designing this as an "off grid" system. If you see any other way round the regulations, I would be pleased to hear them. Regards, Rob
  9. Dear forum, I am new to the forum, but have been lurking for a while and have learnt a considerable amount. So, I have installed a UPS with a hybrid inverter (OHM aka SunSynk 8 kW) that is fed from my main distribution board and feeds to a sub board to supply most of the household. Currently only have a 3,5 kW/hr Pylontech Li-ion battery, but intend sourcing a second unit as soon as the current situation situation allows it. System is working, but not tested under load-shedding yet (temporarily suspended), but cannot use high-draw appliances (kettle) with the current limited battery storage. There is a manual changeover switch on the sub board (1 - 0 - 2) to bypass the UPS/inverter supply. The plan is to add PV panels soon and use those for charging the batteries instead of the grid as is the case now. To meet the City of Cape Town's regulations, I suspect that I need to keep the setup as "off-grid". My question: Is there a changeover switch available that will allow switching between PV panels (400 V DC) and grid (230 V AC) supply to the inverter? I foresee a situation in Winter, when there are a few cloudy/rainy days with no sunshine to recharge the batteries from solar, that I would need to use the grid to do so. I expect Eskom will continue to have load-shedding once this Corona virus lockout is lifted and industry will be playing catch-up. To be provocative, I have thought of a possible solution that may horrify the sparkies. Mount an appropriate AC isolator and a similar appropriate DC isolator side-by-side, but upside-down, on the DIN rail and then connect the handles with a connecting bar, obviously suitably labelled with warnings etc. Probably not a true "break before make" switch though. I suspect this would be non-compliant, but am interested in hearing the comments/outrage at this suggestion Thanks for a great forum, Keep safe, Rob N

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