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Thank you for the great forum, Safe Driving over the weekend. Sincerely Jason


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phil.g00 last won the day on January 11

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  1. Just to be clear, the limitations I stated above only apply when the Fronius downstream of the Victron AC out, not when it's grid side.
  2. From memory: 1. Victron states that exceeding the 1:1 rule will damage their inverter, no exceptions. 2. Victron also states that there should be a minimum of 5kWh of lead acid batteries/1kW of Fronius or 5kWh of Lithium batteries/1.5kW of Fronius. Caveat: I am crystal clear on 1. and just pretty sure about 2. This has to do with system being sized to absorb the surge of excess power during load and grid switching, (as the power control is not instantaneous). The bi-directional inverter has to have a big-enough charger and the batteries have to be able to take it as well, (even if they're already fully charged). Plenty of literature for this rationale on the Victron website.
  3. I can't find any pricing/specs on the WWW, about the RS smart 6000. I did see that it is not parallel capable "yet". I would be quite interested in this if it became parallel capable.
  4. I suppose there are any number of devices capable of this, but it may be moot, if regulations dictate that the biggest system you are allowed is too small anyway. Individual measurements are useful to discover your power guzzlers. Reducing power usage is the first step. ESKOM is adopting a new load-shedding approach, which they have stated will last eighteen months. Which means five years. (Formula = times 2 add 1 and allow) I'd be inclined to pull the trigger now, rather than just be ready to cope with load-shedding just about the time it is due to stop. The Victron system is good, having inherited the "cheap and nasty" initially, I wouldn't go back. There may be other good brands, but I can personally vouch for Victron. I consider solar panels to be cheap and a great investment that starts paying for itself from day one and carries on for 20 years +. On the other hand, I think batteries are a hole in the pocket, but a necessary evil. All aspects of batteries are often debated on this forum. My opinion is, if I was intending to eventually go off grid, I'd go lithium from the outset, if not I think I'd go for a 48V bank of SAGM 06 375 Trojans and try and get 8 years out of them.
  5. Load current (or if you like fault current) originates from a battery terminal and returns to the other battery terminal. Any single break in this circuit will prevent current flow.
  6. Sorry, if its directly bonded this measurement is not necessary.
  7. And the chassis E is now connected to the system E, I understand.
  8. OK, it appears that you have been involved in a capacity outside of this thread. I'll take it then, it has been clearly established that the chassis earth, the system earth and the system neutral are all directly bonded at the same potential. Now, it must be established that sufficient earth fault current will flow during an L-E and N-E fault. The inverter zero sequence source impedance will be different to the grid system. So it needs to be confirmed that the earth leakage protection still works for these two earth fault types when powering the system from the generator.
  9. I can't tell that he has taken these measurements from the information in this thread. I see that he has taken voltage measurements referenced to Earth, but what does he consider to be earth? That is why I was very specific in differentiating the generator chassis earth from the system Earth. If the measurements are from the system earth only, a V-0-V has not been ruled out and the generator chassis could be live.
  10. Is easy enough to find out. But, we have to be clear about where the measurements are taken. I doubt it is floating by design, V0V is a safety precaution of itself, when used properly. Under no load: L to the gen chassis = what voltage? N to the gen chassis = what voltage? Gen chassis to main system earth = what voltage?
  11. If you can physically move the centre tap earth to the to the neutral leg, it is no longer a V0V generator. But bonded means bonded, a hard-wired direct connection. That is what a standby generator has. What you seem to be doing is taking a V0V generator with a floating earth and giving it a high resistance earth reference through a light bulb. Then you are going substitute this neutral for the incoming properly earthed grid neutral. Nevermind, that a bulb can blow and that's a bad idea. This will limit the available earth fault current, so your MCB's wont trip for an earth fault, and it is doubtful that your earth leakage will work. So the difference between this set up and a standby generator, is you could burn your house down and shock people.
  12. Yes, you can make things work, but I don't like this at all. A V0V generator is a portable generator that is supposed to be used for double insulated handtools without earth leakage protection. It is considered safer because only half voltage is available to shock you in an earth fault and its considered a temporary risk. What you consider Neutral isn't neutral, but rather Live number 2. So you get things working, what's the problem? In standard house wiring the convention is that the neutral wire is at ground potential and we switch the live wire, using a V0V supply will mean all appliances are live even if switched off at the wall. People are used to an appliance that is switched off being dead. The MCB's in your DB box that should trip before that fire starts are all on the live wiring. Now a neutral to earth fault will pump away. Your earth leakage protection may work or may not, depending on a few things. There are no legal circumstances that a V0V generator can be hooked up to a fixed installation, with good reason. You need a proper standby generator.
  13. https://www.fin24.com/Economy/South-Africa/mining-companies-can-generate-own-power-without-licenses-matashe-20200203 Well, that didn't really take long at all. Next question Gwede, will the mines be limited to only generating a quarter of the power they need? I don't sense that from this article, because they'd still be at ESKOM's mercy and the mines are gunning for power independence. Now if the power system can handle that, why does domestic solar need to limited to 25% of its supply MCB? It may be true that if we all got solar then the system may be in the crap in the case of a frequency event. But, right now we don't all have solar and the power system is in the crap on a daily basis because of a lack of generation already. Let's cross the first bridge first.
  14. Consider using Unistrut. It is very flexible in its application.
  15. I think the new philosophy is "if we aren't load-shedding there isn't enough plant out for maintenance". SA lifestyles will have to adjust for a few years, I actually think this is a sensible approach. I hope the politicians allow this, and stay out of ESKOM's engine room. The only thing I want politicians to realize is ESKOM is load-shedding after 9am, and that's when solar could provide a dig out, if they cut through the red tape. There are people who are forced to spend money for limiting equipment so as to not export power into the grid. Safety-wise, there must be a compromise between the free electricity illegal connections in Soweto and the hyper-expensive Rolls Royce compliance rules of domestic solar that can benefit the country in these times. A stroke of a pen and they could use pre-existing generation in the very short term.
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