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Gnome

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Everything posted by Gnome

  1. Warranties generally speaking are hit or miss. My GF works in the construction industry as a mechanical engineer designing the HVAC outlay for buildings. And they only buy certain brands and from certain suppliers for this reason. For example, LG closes down their local presence like clock work every 2 years and then starts up again under a different company. So they never honor their warranties. Practically speaking, you can't just look at warranties, you need to look at who is providing that warranty. What does their track record look like, how long have they been around and wh
  2. I suspect you are wrong on this one. The Axpert King is double conversion. So your summary doesn't really make any sense. To give a break down of how I expect it works: AC -> Rectify -> 400v DC bus MPPT ->400v DC bus 400v DC bus -> Inverter -> AC output Axpert King is at no point connected directly to grid unless you run it in bypass/eco mode.
  3. Thing is, this is going to be true of any inverter with fans. Notice how all the responses here say "Quiet generally fans go on with load". Not sure what you'll advise your client but without dBa ratings, it is likely he could have an even noisier setup because everyone here's opinions are subjective. The general fact is, if you turn on a high load, especially an oven (2.5kW load), the fans are going to run at higher speed and be noisier.
  4. Is the source of the noise your AC side or HF emissions through air? My first attempt would be to use a ferrite with wire running some loops through it for wiring (internal to the inverter) going from the MPPT to the Axpert inverter board. Also are you using multiple loops around the ferrite or just putting it through the middle of the ferrite? Your inductance will be really low if you just put it through the center. In which case I would wrap a few turns. Btw. this increased inductance may have other side effects so best be careful about this. If the emissions are radiat
  5. Do you perhaps know what the point of the transformer is? I'm guessing they are either trying to use as isolation in part of a DC->DC converter Or more likely an AC->DC converter? If it is the latter it is a much easier fix to just buy some pre-made AC->DC converters from Banggood
  6. More elegant than me, but the facts are there: https://stormhighway.com/surge_protectors_ups_lightning_protection_myth.php
  7. I can confidently say this product is snake oil. There are two types of lighting damage. Direct strike, which is lighting connecting directly to your electrical supply, which frankly is billion+ volts so there is absolutely nothing that can save you there. We had one of these when I was a child and the TV, fridge, phone, amplifier etc. literally exploded into pieces from the amount of power. Forget about protecting against that with electronics, the power coming in was so much it ripped apart the plastic & metal housings throwing things around. The same can be seen when lighting s
  8. Looks like you'll have to go to this configuration: 60-cell panels can be run in 3S Or switch to another inverter to get reliable solar charging. FYI: Again I'm not condoning the response or how the device operates. I'm just stating the obvious fact that the above is probably what the device limits should be in the manual
  9. They need to repair it, are they actually saying they will not repair or replace it? That is their problem not yours. If they refuse, go small claims court and make it clear that you did not exceed the specifications and as such you expect a warranty return. Unless they stated that requirement in their manual, I would simply go small claims. Your warranty, legally speaking is not with the manufacturer. It is with whom you bought it. So not even sure why the reseller is involving you in this. That is their problem to negotiate. Unless they can point out which part of the manual you
  10. Gnome

    Sunsynk 8kW

    To be honest with you, I figured from first principles. Only after did I go read more about it. I knew that solid state relays were just MOSFETs. And MOSFETs always fail short-circuit. However the opto-isolators is pretty decent isolation. The reason I thought this is because you don't typically expect a relay to consume current on the switching side, only the coil side. Bit of a drawback with using them I guess. Most opto-isolators are rated roughly 4kV, so it doesn't take *that* much to break the barrier (lightning tests typically start at 200kV up to 1MV). In terms of break-d
  11. Gnome

    Sunsynk 8kW

    Actually I stand to be corrected: They internally do use opto-isolator to create isolation: https://www.electronics-tutorials.ws/power/solid-state-relay.html Just verify in the specification of the relay you bought that it does actually isolate.
  12. Gnome

    Sunsynk 8kW

    "Solid state relays" do not provide electrical isolation. When the MOSFETs on the solid state relay fails, it'll fail short circuit. Mechanical relays don't have this problem. You really should not be using that relay. EDIT: Also it looks like your are connecting the relay using a low voltage circuit? If that is the case, you've effectively removed the isolation from the low voltage circuit. A very big no-no. Anything connected to that low voltage circuit (including network cables) can become live.
  13. Why is it not logical? Where do they state they individual components? The inverter is basically a boost converter with a rectifier followed by an AC output stage. When the inverter isn't in use the boost converter can be used as a buck converter to charge the battery. The charger and the inverter are the same component. The MPPT isn't isolated. This isn't even unique to Axpert. If you over volt any kind of electrical component that isn't isolated by a transformer, Y class capacitor or opto-isolator, you'll blow right through the MOSFET and fry anything that either isn't isolated or
  14. Yeah it is very cool. It actually makes a LOT more sense than for example the Victron or Axpert approach where they try to allow overload with some silly electronics. You just get a lot more reliable system by not having it go through the inverter when you clearly don't want it supplied that way.
  15. I mean they'll say the kW, for all the newer Axperts, 5kVA = 5kW. But that said, the power factor does not come into play on the inverter... Power factor is determined by the devices you power in your home. So ultimately if you bought good quality stuff your PF is close to unity (1.0) in which case the extra power factor overhead is wasted. But if you use a lot of things like florescent lamps, motors, very old switch mode power supply, your PF could be around 0.5 or lower in which case having an inverter with a higher kVA rating is sufficient. That said, if the kVA and kW on an invert
  16. I live in an apartment, so I don't use the solar charge controller. I just use it as backup when Eskom fails. My light circuit and a "red plugs" in ever room of the apartment are fed from the inverter. Been running like that since roughly 2014, I switched to an Axpert King in 2018 (If I recall correctly) for the double conversion, I have a lot of computers and stuff I didn't want damaged by Eskom's sh!tty supply. I power my TV, router, microwave, kettle, Nespresso, fridge, TV, amplifier for TV, NAS, home office from the Axpert, occasionally things like vacuum if there is load shedd
  17. I updated my post and figured as much I assume you mean more something like this: Grid - >CT sensor - >loads Grid - >CT sensor - >inverter - >essential loads So loads and inverter are in parallel but both monitored by the CT.
  18. I guess I don't get why it is external. Current Transformers are installed on all inverters (and UPS for that matter) but they typically housed internal to the device. Since the device can't control anything else that would export, I'm curious how having it external is beneficial? EDIT: Ok I think I get it. All the current you consume may not actually be going through the inverter input. You may have significant loads in parallel to the inverter and having this external CT allows you to monitor and back feed for those situations without actually needing to pass significant currents vi
  19. I never saw that setting but regardless the neutral and ground are connected (tested this for obvious reasons). I suspect they are doing this with a relay.
  20. Relay, base for relay. Wire it so that the normally closed is connected to ground, common is connected to inverter neutral. Normally open is not connected to anything. Coil is connected to utility power (NOT inverter output). It guaranteed will cause an earth leakage to stop working. I can say this with 100% confidence because I've tested it on an Axpert inverter. Even significant leakage has absolutely no effect. It is hardly unique to Axpert inverters but I tested it for sh!ts and giggles anyway. It will also result in any electronics that relay on ground for noise rejecti
  21. I'm curious, why would an inverter have an external current transformer?
  22. Aren't you supposed to be a qualified electrician? Can't you drive there, disconnect the load from the output of the inverter and measure the input current on the positive lead of the inverter? It isn't my day job and even I have the equipment to do that.
  23. So the specifications of the device states 60-115v and you are running it on average at 137v and you are wondering why it is blowing up...
  24. There is such a model? The only one I know of that is more expensive is the 3 phase version, but I don't believe Victron has a competing product?
  25. Have you considered that perhaps the problem is not the product? By this I mean, doing research and sizing appropriately? Don't get me wrong, I'm not one to advocate for the user is the problem. But in this case, I've seen a lot of problems with Axpert inverters when users load them up with solar panels to the point of exceeding the maximum voltage rating which usually ends the way you describe. On Inifi/Axpert inverters I would not run the MPPT at more than 75% its rated voltage. For sure Voltronic Power are at fault for over-representing their product specifications and expectin
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