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- เผยแพร่เมื่อ 20 มี.ค. 2024
- Don't even think about powering your off grid home with one of those low budget Chinese made, high frequency, transformerless inverters They're not only short lived and offer a weak peak power capacity when compared to conventional, off grid, low frequency solar inverter systems, they can also be dangerous.
You'd be lucky to get even two years of service from these overpriced high frequency off grid inverters, especially when powering high inductance loads like full sized refrigerators, large power tools, portable AC units, motors or large microwave ovens.
The reason for this is that all these high frequency inverters lack a very critical component. That critical component is an iron core, copper wound low frequency, output transformer. Without an output transformer to act as a buffer to absorb electrical surges provided by the “Flywheel Effect” inherent in the physical amount of a transformer’s iron, these surges and damaging reverse voltage spikes must be handled directly by the inverter’s MOSFET transistors, essential shortening their life.
As demonstrated by many of these affiliate product hucksters on TH-cam, you might be able to start and run some high surge loads when these solar light duty, off grid inverters are new, but every time you fire up one of those inductive loads, you're shortening the life of the MOSFETs in these off grid inverters.
High frequency inverters run much hotter than low frequency, transformer-based solar generators which makes the low cost, off spec, Chinese made components such as capacitors, diodes, resistors and ICs that are used in the cheap inverters that are used in these solar generators, far more prone to early failure.
Another major consideration with these high frequency, transformerless inverters is safety. All it takes is for one of their MOSFETs in the inverter's H-Bridge circuit to short to ground or the waveform monitoring circuitry to fail, and these units will can dangerous, high voltage, high amperage DC current straight to your connected AC loads which will not only damage most AC appliances but can also set those AC appliances on fire.
Another consideration that is never mentioned by those youtube, solar inverter salesmen, is that the vast majority of these solar generators are non-repairable. After the warranty runs out, you're not going to be able to ship these units back to the manufacturer in China and have them repair them. And at a typical shop rate of $125 per hour here in the US, with no schematic and limited parts availability, it won't makes economic sense to even attempt to repair one of these units.
Once the FETs have fried and have burned a good portion of the inverter's PCB, (And trust me, sooner rather than later, they will fry.) they basically become a brick. A far better alternative is to invest a little more money and purchase a low frequency, transformer based inverter charger and a set of LFP batteries and build your own real off grid solar system.
Low frequency transformer based inverter chargers last many years longer than these toy high frequency inverters, and can easily power high surge loads without being damaged and without damaging your appliances. That's why the big name brand inverter manufacturers like Schneider Electric, Outback Power, Sigineer Power, Victron Energy and others, all use a low frequency topology in their offerings.
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There's a reason I paid "extra" for the Victron.👍
Here's a good analogy:
Think of a low freq inverter as a heavy, cast iron block, low RPM diesel with a big heavy fly wheel and a large capacity cooling system.
Think of a Chinese high freq inverter as a small, all aluminum, high RPM, air-cooled, 2 cycle engine, with a tiny flywheel.
Which one do you think will last longer? Which one will be able to handle the big startup current surges for your A/C unit, or your 5HP well pump?
Awesome analogy! You hit it right on the nail head!
Over exaggerated it all depends what you are going to use the inverter to do what job and what is the purpose. Yes I would definitely recommend Victor on the circuitry on the low frequency inverter is very well designed but they are not cheap everybody has a budget. There is nothing wrong with high frequency inverters if they are designed correctly. High frequency versus tend to be a lot more efficient lower power consumption without load rather than a low frequency inverter. But then again it all depends what is the purpose of the inverter if you're going to run a full house then yes I would recommend low frequency but at the same time if your calculations are correct you could have two high frequencies synchronized together which will work very well.
There's plenty wrong with high frequency inverters. They don't last as long, they've got a crappy surge capacity. And because they don't have an isolation transformer, when they fail, they can take out your appliances in a heartbeat. Why do you thing they're so cheap? They're basically a poor man's inverter. And you don't have to buy an expensive Victron inverter anymore if you want a high performance, low frequency inverter, There are plenty of Chinese made low frequency inverters available that sell for nearly the same price as these junk high frequency inverters. The only people that are promoting these cheap inverters are youtube salesmen that earn a commission when you click on their affiliate links.
Man, those high end Sigineer Power inverters are monsters! Surge Rating: 60,000 Watts (20 Seconds)? Weight: 220lbs?? WTF???? Wish I had a couple.
Great advice, keep up the good work...
Thank you!
I have a friend here in the Dominican Republic who makes inverters/Chargers. I have one that's 5KW/48V and I power pretty much everything in my house. Surge is about 8.5KW.
I have a Chinese Meanwell 3000w HF inverter running 7/24 since May 2011.
Running what? Resistive loads?
@@Madsci-zy8wm fridge, submersible pump,TV, CCTV and lights
Weanwell company not from chinese, these made in taiwan., power supply specialist ❤ i like it tho
@@evrenforest2578 What is your solar array and batteries rated at?
6*250w PV array with 48v200 amp gel batteries
How do we tell if an inverter is low or high frequency when looing to buy one? Is it listed somewhere that is reliable? Just because a vendor says their inverter is low frequency does not mean it really is.
One way you can easily tell is by the weight. A typical 5 Kw all in one high frequency inverter charger will weigh 52.9 lbs. While a 5kW all in one low frequency inverter charger will weigh 99 lbs. Another way you can tell is by the surge capacity. A high frequency inverter will offer a maximum of a 200% surge capacity while a low frequency inverter will off at least a 300% surge capacity.
@@kickgas7171 Hahahaha. Yeah I was going to say, if you can pick it up with one hand, it's not low frequency. :)
i agree. low frequency inverters ar superior and last a long time ompared to high frequency ones. i have both but i mainly use my low frequency inverter 10kw. best part is, parts cn be replaced easily as opposed to high frequency. this video ticks all the boxes.
I use a HF one as a backup, the main one I use is a chinese one with a 15kg toroidal transformer, which I only replaced my previous one because snow condensation blew the mosfets, learned from that🤨
This is the reason I never recommend HF inverters for my clients.
Do you have inverter that 120 volt AC as input?
Sigineer Power makes 120 VAC Input/120 VAC output 60Hz. Inverter chargers with AC transfer switch from 1.5kW to 4kW that are reasonably priced.
How about we buy let say 10kw high frequency Inverter, but only use max 5kw load ? So even powering peak it wont break ????
Why spend all that extra money for a 10kW high frequency inverter that cannot start 10kW inductive loads when you can spend less money on a 5kW low frequency inverter that will start the 5kW inductive loads that you want to limit yourself to?
Buy 3 times the size you need for running hf inverter on fridge or freezer or pumps
You are still kind of rolling the dice. Yeah, it might work. You have to look at the specs regarding peak current versus hold-up time. There should be 3 or 4 values given. X amps for 10ms, Y amps for 100ms, Z amps for 1 second, etc. That sort of thing. Not every heavy inductive load is the same. And here's the other part: Who's specs are you gonna believe? Chinese physics typically is not the same as American, German, or Japanese physics. Translation: They lie about their specs all the time.
where is the link to this great inverter?
It's not just one inverter. Most top name brand US inverter manufacturers only build low frequency transformer based inverter. Brands like Schneider Electric, Outback Power, Sigineer Power (a Chinese brand), Magnum Energy, Victron Energy, just to name a few.
Buy from a country that doesn't sponsor genocide
While I agree with all you said, I only subscribed because of your Dad Joke Motto.
Much appreciated.
but money
Low frequency inverters are now priced at levels that are very close to high frequency inverters. Only 10% to 20% more.
Who makes a Decent Low Frequency inverter say 1500 watt ?
Sigineer is one brand. Their 1500 Watt low frequency inverter is available in both 12 volt or 24 Volt versions. They have built in chargers and a transfer switch for fast UPS function and they offer a high 4,500 Watt peak power capacity.
@@kickgas7171 ok thanks I'll check them out someone was telling me about Victrons Phoenix line too.
I have there 6k now for a week. It’s nice but querkie.
@@2hotscottpro All inverters are quirky. Even big name brand, US made inverters are quirky.
Studer
toroidariffic!!!!
Hmm... Is this a China bashing video!? 😅
Nope, plenty of reputable, Chinese manufacturers make high performance, high quality low frequency, transformer based inverters. It's only the Chinese manufacturers that make the low quality, short lived high frequency, transformerless inverters and their American dealers and affiliate, TH-cam advertisers with their misleading product reviews that we're concerned with.
It would seem so. After all, it isn't the Chinese that invented high frequency inverters. It's a European design. 🤷♂️
@@ekeretteekpo3004 Nowhere in this video is it mentioned that the Chinese invented the high frequency, transformerless inverter. Actually, modern day high frequency, transformerless inverter design was initially developed by William McMurray who was born in Los Angeles, California, on 15 August 1926. He grew up in England and earned his B.S. degree in Electrical Engineering from Battersea Polytechnic in London in 1950. He earned an M.S. in Electrical Engineering from Union College in Schenectady, New York, in 1956. In 1965, McMurray first developed the FB or H-bridge inverter design that the Chinese are now using to build their low cost, high frequency inverters. While it might be true that the Chinese did not invent high frequency inverters, they did in fact used this design to mass produce the inferior high frequency design that they are now dumping on the US market.
@@Madsci-zy8wm channel that anger or hate towards whomever greedy American businessman that decided cheaper, low quality low frequency inverters would earn him more $$$ for his investments. It's like they upped and started making inferior versions and decided to invade other countries with them. After all, they also make the premium versions as well.
it's laying out facts - get what you pay for.