http://www.lz2gl.com/data/power-inverter-3kw/eg8010_datasheet_en.pdf
The module manual:
http://www.egmicro.com/download/EGS002_manual_en.pdf
WTF? Why is the Neutral line being driven, and without filtering? [reads datasheet...] Oh, I see. Urrgh. That's completely unacceptable.
Why? I can see unipolar much more cost effective than bipolar solutions, and has potentially lower loss and size. The reason I use bipolar is because I want better THD, and GaN devices simply introduces so low loss that it won't hurt.
Because in their reference design, the Neutral line has an unfiltered non-sinusoidal HV signal on it. This means it can't be used with standard home wiring since a) not safe, and b) lots of EMI radiation. Oh, and no DC isolation between AC mains and battery system.
This thread is interesting. But if someone (or several cooperatively) were going to do an open-source mains inverter design, rather then just jumping into schematics a better initial stage would be a thread discussing design objectives.
Because there's a lot of potential to do something really useful, considering the various reasons why there doesn't seem to be an open source 'power independence' inverter system already.
This design is not intended for extension or expansion. This is just a pinched decision as well as a showcase of wide band gap devices.
Sorry, I am aware you just need a quick fix. I should have made it clearer I wasn't criticizing your efforts. Just commenting that it could be useful if this forum also did a wider scope inverter design process, with an initial 'decide on objectives' stage.
For example, the design could ignore:
- patent restrictions.
- government policy prohibiting true grid-tied/grid-free/no-dropout transitioning systems, able to do 'quiet grid load profiling'. ie injecting power into the local side of a grid-tied system, to reduce consumption from the grid, while looking like a standard power-consuming household. For when you have some local power source, but don't want to announce it to anyone, and it's illegal in your area to actually disconnect completely from the grid. Or you do still need grid power sometimes.
- government prohibitions of building-cluster or small community private distributed power sharing systems.
From you various post and our PM, it seems like you are very anti-government. Be my guest to start whatever anti government designs, I'm not in. I would like to keep my visa.
You're right, I am. Though substitute 'corporate & financial-elites fascism' for 'government'. Government operating under the thumb of the financial powers is just one face of that evil. Not unique to any country.
Being critical of such things is not an unusual position these days, and for good reason.
I do understand your position on this, and on the other matter. Yours is also a widely held view. A little cowardly, and in general people ignoring wrongs and saying nothing enables the excesses of the power-hungry bastards, but it's your choice. (One you may ultimately regret, I think.)
"And how we burned in the camps later, thinking: What would things have been like if every Security operative, when he went out at night to make an arrest, had been uncertain whether he would return alive and had to say good-bye to his family? Or if, during periods of mass arrests, as for example in Leningrad, when they arrested a quarter of the entire city, people had not simply sat there in their lairs, paling with terror at every bang of the downstairs door and at every step on the staircase, but had understood they had nothing left to lose and had boldly set up in the downstairs hall an ambush of half a dozen people with axes, hammers, pokers, or whatever else was at hand?... The Organs would very quickly have suffered a shortage of officers and transport and, notwithstanding all of Stalin's thirst, the cursed machine would have ground to a halt! If...if...We didn't love freedom enough. And even more - we had no awareness of the real situation... We purely and simply deserved everything that happened afterward."
-- Alexander Solzhenitsyn {1918-2008), The Gulag Archipelago
By the way, not long after this article appeared:
20160502
http://www.womenofchina.cn/womenofchina/html1/news/china/1604/2230-1.htmPresident Xi Jinping Asks Officials to Respect Intellectuals' Creativity, Criticism
that person I spoke to you about began posting again, and is OK. Ostensibly no connection between these events, but then if there was, it wouldn't be admitted.
Also including:
- Ability to disconnect (main contactor) from the grid and reconnect, without transients and dropouts. Means your local inverter has to be able to accurately sync up to and waveform-match the grid before reconnecting, and smoothly shoulder all your local load before disconnecting.
- Basic inverter module (of say 1KW) able to be paralleled up for higher power and redundancy.
- Ability to run one, two or three banks of inverters, phase locked correctly to provider single or three phase power for machine tools. (or 2 phases if needed for some reason.)
- Flexible power origin and storage management subsystems. Solar panels, battery banks, local DC LV household bus, etc.
I'm originally designing for a module that is not much bigger than any other modules such like an ECU, sitting under the hood, and operate at automotive temperature.
Then I connect AC output wires through a socket mounted inside and in front of my car, while ON/OFF switch connected to main key switch.
This gives me a poor man's gasoline generator good up to 600W.
Sure, quite useful, especially given the crappy quality of cheaply available inverters. I have something much the same, for car camping. Couple of solar panels, a commercial panel-battery management unit, large 12V lead acid battery, and a small inverter. For remote car-camping, it's not a good idea to draw from the main car battery.
I can also use it at home during power outages, but since the cable Internet also goes down then, it doesn't help much.
One reason I keep an old fashioned wired phone land line. No net via it though.
But for home power, it annoys me that the standard grid-tied no-battery solar panel installation inverters seem to all be designed to deliberately be impossible to adapt to stand-alone battery storage operation. And systems that are designed to run in isolation with batteries, don't seem to have provision for agile grid connect/disconnect.
Seems like the official reasoning is "we will subsidize grid load reduction via solar, but certainly won't allow anything that might provide suburban households with an option to disconnect from the grid, either intermittently or permanently."
Btw, with your system don't forget that the car battery is grounded to the chassis. If your 120V AC output is not isolated, and somehow gets connected to other household wiring, you might end up with a dangerous voltage between your car body and ground.
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