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PierreJ

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PierreJ last won the day on January 14

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  1. Hi Nigel, No, fortunately my situation is not that bad. I have a later hardware revision (v5), so it should not be affected by that particular issue. My Multi regularly throttles down to 3700W, but I've never seen it go lower. I wouldn't have taken much note of that if it wasn't for the temperature warnings. I've now set the "Limit Inverter Power" ESS setting to 4kW which will hopefully stop the overload warnings. Apparently the efficiency drops quite a lot under heavy load, so perhaps limiting it to 4kW will also lower the temperatures (I noticed that it will occasionally output
  2. Hi, I have a Multiplus II 5kVA unit (hardware revision 5, configured as part of an ESS system) that is reporting temperature warnings from time to time. Below is the screenshot of the VE.Bus Warnings and Alarms for the past 30 days: The highest ambient has ever been is 34C, but it hovers around 30C on most days. Airflow around the Multi is not obstructed: The warnings coincide with heavy loads either at the input or output side, and it running at capacity. I find that it derates to 3700W very soon after a heavy load (e.g. geyser) is switched on. I've never seen it dera
  3. I reckon I might follow your lead and do something similar. While the heatsink has improved the situation with my SmartSolar (Interestingly I've never seen it throttle, even when it hit 82C), the Multiplus drops down to 3.7kW during the heat of the day. The outside case gets uncomfortably hot, so I can only imagine how hot it must be inside. I also get high temperature warnings in the VRM console from time to time. I can hear the fan inside it running at full tilt but I don't feel more than a very gentle draught at the bottom air vent. Is this normal? The temperature inside the scullery i
  4. Thanks! Both the SmartSolar and Multiplus run quite hot under full load - which is pretty much from 10am up to about 3pm every day. I worry about longevity of the electronics. I am considering removing 3.2kWp of the panels from the SmartSolar and connecting them to an AC-coupled Fronius Primo, which will also reduce the load on the Multiplus during the day. It's an additional R25k+ outlay though, which is hard to jump over. I have 5 PylonTech batteries so I needed to use two pairs of their cables. I couldn't find a 4 pole disconnect, so I decided to use 2 x three pole disconnect
  5. Got the sign-off from CoCT about a month ago, so my DIY solar project is finally done and dusted. Thanks to everyone on the forum that provided advice - I probably would have stuffed it up if it wasn't for you. The whole project took about three months of evenings and weekends to finish, and was a welcome distraction from the current state of the world. 4 strings of 4 Canadian Solar 400Wp poly panels in series, facing NNE. Another string of 4 Canadian Solar 400Wp panels in series, facing WNW. All five strings are paralleled together for a combined
  6. Just an update on this: Turns out it was a problematic cell in one of the batteries. Once the battery was exchanged the warnings went away and haven't come back. Thank you @Youda and @plonkster. Oddly the firmware of the newer battery is almost a year older than the older batteries, even though the new battery was manufactured in May 2020 and the older batteries in November 2019. They seem to be working together just fine though. For anyone considering buying Pylontech batteries, but worried about warranty and support issues: My experience has been very positive. I dealt directly wit
  7. Not yet. I'm going to give it a few more days, and if I'm still getting high voltage warnings after that I'm going to make up the cable and dig deeper. Thanks for making it available. Should I be worried about these high voltage warnings, or is it safe to ignore them? Presumably the BMS will shut the battery down before the cells get damaged, right?
  8. I thought so too, but after a couple of cycles down to the region of 60% and back up to 100% it started throwing the warnings again. Perhaps a recurring cell imbalance? I've been coaxing it for more than a week now, so if it was only an initial imbalance it should have been sorted by now. Judging by the rate at which the voltage drops from 52V when discharging, and the rate at which the voltage rises above 52V when charging it's very clear that the Pylontechs store a minuscule amount of energy above that range. Presumably that means that even the tiniest of imbalances will
  9. Referencing a very old post here, but in the Venus OS 2.60 beta the Pylontech charge voltage was raised to 52.4V (we've discussed this privately), and a new feature was added to allow the limiting of the grid export. Using the latter with a low export limit (e.g. 100W) causes the charge voltage to rise to 52.8V, and sometimes briefly 52.9V. I'm regularly seeing "high voltage" alarms from the BMS at 52.8V. If I disable feed-in or allow the Multi to feed in the full excess then the voltage drops back to 52.4V and everything is fine. Perhaps 52.8V is pushing the envelope a bit, or I could just ha
  10. I'm busy looking at SANS 10142-1: 2017, but I can't find this requirement anywhere. Do you perhaps recall under which section it is stated? Looking at my main DB I see multiple violations of this, and it has passed two CoCs that I know of. Is this a SANS 10142 requirement?
  11. I haven't actually. I have ordered 6mm^2 cable online (which is massive overkill for the 10A it will be carrying), but I've never held it in my hands. Perhaps once I see it I'll be reassured. I'm leaning towards not using conduit at all now. I'm slightly worried about rodents gnawing through the cables, but if I look around in my ceiling I see plenty of tasty AC cables that have been there for at least a decade that haven't been touched. Thanks for the advice.
  12. The exact wording in section 6.2.6 is: "Positive and negative cables shall be run alongside each other, to prevent the formation of induction loops;" If I put the two metal conduits next to each other, touching, will that pass muster? It just seems safest to me to put a physical barrier between the +ve and -ve cables.
  13. I've read through the draft document, and the rules seem kind of strange: In section 5.3.5.2 it states "Where conduit is used for DC cables, it shall be metal conduit." Then in section 6.2.6 it states "Where a system features longer DC cables (e.g. >50m), consideration shall be given to the use of screened / armoured cables, or to installing the cable in earthed, metal conduit / trunking." And again in section 6.2.8 there is the wording "Where a system features DC cables longer than 50m, the cables shall be installed in earthed metal conduit or using armoured cable." So
  14. Thanks. That seems a bit draconian, given that 220V AC in PVC is apparently just fine. My plan is to run two separate conduits, one with + cables and a separate one for the - cables for my four strings. All the + and - cables will be shorted together in the combiner box anyway (after the fuses/isolators), so this should be quite safe. There will be 4 strings, so 4 cables in each conduit, 10A @ 200V DC. My application has been approved by CoCT, but I haven't actually started installing - the lockdown has put a stop to that. The big question on my mind now is that if this draft standard bec
  15. Are you sure this is a regulation in South Africa? I spoke to my solar installer and according to him PVC conduit is acceptable inside the roofspace.
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