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Everything posted by ___

  1. In my house we generally have two cars. The one is the long distance holiday car, generally dad's car. It is bigger, more comfortable, and it has an internal combustion engine because it needs to drive deep into Namibia. The other one is a small little hatch that does maybe 6000km a year. We bought the last one 5 years ago at 85k. Right now we're kinda sorta thinking of maybe replacing it, and the budget is 150k (ish). An EV would be perfect for this second car. But for the difference in price I can buy a heck of a lot of fuel and do a lot of maintenance... and get some interest on t
  2. Oh man do I have a story. Well two... When I was about early high-school years, my dad sent me to go fetch the Bobbejaan (for those who don't know, this Afrikaans also means Baboon). My younger sister (probably around 6 at that time) who was inside the house heard this, and came out of the house, waiting anxiously for my return from the storage place, which was around 100 meters away. She was quite upset when I didn't return with the expected Baboon by my side, but instead with a monkey wrench. The second was a case that almost turned into labour unrest. My dad and his employees were
  3. Waterpomptang! Growing up on the farm my father would say that that funny-looking pliers isn't really useful for anything, and I remember that there was one in the toolbox which we almost never used. We'd always go for the monkey wrenches. Of course everything was 3/4" steel pipe... or 1.5" black pipe. Then I moved to the city, and I learned that plumbers use essentially just a water pump wrench and a maybe a shifting spanner. Occasionally a blow torch... As a result, I now own both good water pump pliers and two monkey wrenches, and I almost never use the wrenches anymore
  4. I edited my original post because I got the math wrong. 5*70 = 350Ah. At 10kW or 200A, that is a little over C/2. Which should not be an issue for an LFP cell. So 2 (extra, in addition to the 3 existing ones) will do it, but 3 is better. During testing, I've never seen a Pylontech battery raise a high current alarm... but that may just be because we haven't done it long enough. Hence, I don't know when it raises such an alarm. Other batteries I've worked with tend to allow you some abuse as long as they remain cool, below 40°C.
  5. Sure... but the question doesn't have a yes/no answer. It has a "how long" answer. I don't know. As long as the battery stays under 40°C and you stay under 2C discharge rates. 10kW is 200A. A US3000 has a 70Ah capacity iirc, so 280A is 2C. Remember also that the Pylontech batteries keep a log of what you do with them. As in literally... it has event data in it. If there is a warranty claim, they will pull that data down and see what you've done. Personally, I'd advise doing 2C discharges for no more than maybe 60 seconds. So in my mind, though a 10kVA will run fine, you won't be
  6. A Quattro is just a Multi with two AC inputs. The inverter component is the same as for the equivalently-sized Multi. So your Multi-knowledge will be applicable in most cases
  7. I mentioned that there are over 1000 different "brands" of pianos, the analogy is that it is the same for batteries
  8. Müller was a bit like a furniture store back in the 1900s in Cape Town. If my google-fu has not left me, the remains of that company is still around via Allen and Fisher pianos, who still have premises in Wynberg today. They imported pianos from Germany and sold them under their "house brand". That is why many of these pianos are basically either an Otto Bach or a Carl/Carol Otto under the skin. Some of them are quite good. Others (like mine) look the part but are basically workhorses underneath. After buying such a piano without doing any of the required research (and almost ending up with a
  9. Unlikely at least in theory. Though I've seen a lot of weird things in practice. If I had to guess, you were probably running a standing leakage of close to the nuisance tripping point (around 15mA), and this tiny change caused just enough of a disturbance. Or maybe you plugged in your cordless screwdriver's charger or something and forgot about it. Never discount dumb coincidence. In these cases I found that I can almost always think back to the last appliance I added, unplug it, and the nuisance tripping stops. I know only two solutions. First is to check the insulation. Probably have t
  10. That's the thing about an acoustic. if it is no played and tuned, the strings rust, the wood dries out, everything just goes out of wack. Whenever I see an ad saying the Piano is in perfect shape, it just needs a tune... I snigger a bit. If it hasn't been tuned, it has been neglected, and if it has been neglected, you have no way of knowing that it is in perfect shape. Presently I own a fairly plain piano. Officially it's a Carl Otto, which was the cheaper of two options (the other one was the Carol Otto), but it was rebranded as a Müller, who I believe imported these around the turn
  11. Vely vely funny.. There are over a thousand brands of Pianos and most of them are just cheap knock-offs. You want something neat, then look at a Kawai or a Yamaha. And man do they cost. I was looking at a Yamaha GB1 last week (baby grand). 165k. Car money. Can't really justify that... Oh and the naming. Bernard Steiner. Sounds Germanish? It's the higher end Pianos formerly made in Welington by Dietman. Dietman also made heaps of pianos branded under his own name, which were essentially German "Otto bach" pianos (similar components). But the one I really want is a Yamaha G2. There is
  12. ___

    Axpert software

    Open source merely means the source code is available. It does not necessarily mean you are not paid to write or maintain it. Paid open-source work does exist, and because of the enormous effort involved in maintaining it, lots of people are happy to pay the original guy to continue doing it. The upside of open source is that I'm not locked into a single provider. Of course I am nitpicking, you are not wrong in pointing out that the majority of open source is written because someone scratched an itch, and then released it under some very permissive license because he honestly doesn't
  13. I agree with this. The Cerbo is better, yes, but if you don't want issues then run a network cable. Some Wi-Fi extenders have an ethernet plug (eg TP-Link TL-WA850RE), then you can run an ethernet cable to a clear spot and pot the Wi-Fi extender there. Also very useful, there is an Android App called WiFiAnalyzer that gives you an idea of signal strengths of the various APs, that also helps to get an idea of where to put the extender.
  14. You can connect more stuff before the thing becomes overloaded. Especially important if you plan on having multiple MPPTS (more than 3), or multiple PV-inverters, and especially when you have a three phase setup (everything times three). Then you want a Cerbo or the MP-II-GX. Also, if you want to mess with MQTT or any of those nice IoT things, get one of the faster ones. For the average single-phase residential install without too much hardware, a Venus-GX is more than sufficient though. Which is why price might be the final arbiter.
  15. Right, let's get technical... The Multiplus-II-GX (And Easysolar-II-GX) have a built-in board. This is essentially a small ARM computer. All the GX devices are. But the one in the MP-II-GX is based on a quad core 1.2Ghz Nanopi which is the fastest platform of all 4. The Cerbo is the next fastest, followed by the Venux-GX and then the CCGX. So unless the built-in GX option costs significantly more than the external one, I'd encourage you to go for it. There is one exception though: If you want to use the fancy analog/digital connections on the Venus-GX/Cerbo-GX, then obviously
  16. No, that's not going to work. The inverter wants to close its transfer switch and connect the input to the output. The outputs are tied together in a single phase system, but the inputs are 120 degrees apart with 230VAC between them. In all likelihood the inverter will refuse to use the AC input, but it could also blow things up if you try this. You'd have to either reconfigure the inverters into a three-phase system, or get a separate three-phase charger.
  17. Osaka batteries are from Pakistan. But that is if you assume this is actually an official Osaka battery. It is quite common for Chinese companies to slap a name on a product to make it sound cool. Many many German sounding pianos (another passion of mine) are made in China. They will spend money to buy the brand name, so some companies actually make money by allowing Chinese companies to use their brand. Telefunken? China. Philips? China. So I think we can safely assume we don't know where that battery is from. You can probably expect around 700 cycles to 50%.
  18. The temperature sent from the GX device merely overrides the temperature reading from the Multi. The voltage compensation adjustment is still done by the Multi. In an ESS system (not sure if you run that, probably not), the compensated charge voltage from the Multi will then be sent to the MPPTs as well (in other words, the Multi is in complete control). In a non-ESS system (aka off-grid), the temperature is sent to the solar chargers and the Multi, and each one does its own compensation depending on the coefficient it has configured (so you probably want to make them the same). But I don
  19. OK, this was another bug fixed in Venus 2.60. I patched it in place. Try it now.
  20. OK for some reason the temp is not written to the Multi. grrrr.
  21. Aaaah... that has to be on, or it won't work. With a lead acid bank that's not going to cause anything unwanted. Also, turn off SVS, SCS, but turn on STS (shared temperature sense). And then select the sensor. Which I have done already for you. The extremely long text for the temperature sensor... that is fixed in Venus 2.60.
  22. I'd do it for you, but you have a password on it
  23. Your temperature sensor selection is set to "default". A decision was made not to be too "smart" about auto-selecting one, because people do really weird things. They put a sensor in their freezer on their boat, forget to configure it properly, and next thing we're overcharging the batteries because it's -15°C. So the only sensor (that is not connected to the Multi) that will be used automatically is a temperature sensor connected to the battery, in other words, a BMV-702/712. All others must be explicitly selected. So just select the temperature sensor under System Setup.
  24. Found your site... House 'your surname'. Poking around now.
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