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Unrelated question: What if we used 240VDC for appliances instead of 240VAC? Easier to convert, no power factor non-sense, what are the drawbacks?

Ripple. So did they have Ripple wine in Australia? Or Nixon likes Ripple wine buttons too ? Lol

the two ICs are: ES51919 and ES51920 of Cyrustek

Still in northern California and still glad I live here. Nice that the younger suburbia raised "tech bros" have left. Violence and theft no different that all the other US cities, and declining. Basically the same problems across the nation. California has by far the largest population so everything gets noticed, and naysayers find anything they can to dis this state. All that said, PLEASE keep on saying that California is going down the drain..It just makes more enjoyable, more affordable, and more of a creative nexus. Helps us bring back some of the old -pre-techie era life

NVidia are the real pioneers here. Not only did they make graphics cards to drive the first 4K display but made a graphics card to drive Apple's 30" Inch Cinema display just 3 years after this release.

Call me stupid but thats some dodgy soldering there 😮

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Hi, Dave. Thanks for the nice video. There are boobies in clip, bet youtube found them not till yet.

This is the worst YT videography I've ever seen. You might learn how to hold a vidcam steady. Or better yet, use a tripod.

The latest version at Richer sounds in the UK is £2199 and the case £100

😅..😅😅😅😅😅

I presume the 150A fuse substitutes for the DC side H-Bridge blocking cap. Issue with blocking cap is heat, reliability & board space (AC caps are bulky) and cost.

Dave, can you please do a seperate video explaining tri level switching and HERIC.

Aishi (pronounced 'aye shur' cuz Pinyin) is a common cap brand to find in compact fluorescent and LED lamp ballasts, in which applications they seem to survive well enough given the roasting they get. The series connected Hongfa relays may be a cost cutting measure. I have 2 Sol-Ark 12K inverters made by Ningbo Deye (pronounced 'duh yuh') and all of the main AC relays are Japanese made Panasonic/Matsushita rated for 63A.

In my job building control panels I've seen different brands of meters. I say stick to mainstream brands. I have a Fluke and a Klein meter. Coworkers have GreenLees and they all work great and survive the rigours that we put them through like being knocked off work benches etc. Those $20 not so much. I like that Fluke has the basic model out now. For the homeowner who never measures current but needs to trouble shoot why the light never comes on Voltage and Continuity do the job. For that price it's worth buying and throwing in the tool bag.

You guys have been sniffing too much quality rack .. Was fun to watch.

Far better than youtube,less censorship,less surveillance

Well, for the brand-problem or those components: Possibly they switched not by choice, but 'cause they are difficult to get now. Being forced to use china brand components in a Chinese product, nice result of weird politics.

Any updates on this?

I have spent more time researching this decision than how long I actually solder. I chose Weller because I like blue and Hakko doesn't roll off the tongue as easily, also it reminds me of the horrible Magic Johnson Lakers shoes that a classmate wore in grade school. I hope this helps someone else in this critical life decision.

It's so freaky amazing! Whole building! Impossible!

Future video idea: show how a tds meter works and how to use a multimeter to get the same results.

You know, this teardown makes me wonder how come these inverters make so much high pitch harmonic noise.

There's this Chinese saying: "能骗就骗 (If you can cheat, then cheat)". One should never forget that, especially when buying stuff from there. It's kinda sad that Chinese companies design a high-quality product and _still_ think they have to lie about it.

15:43 Does anyone know the article number of that or similar smd current links❔ I need some for an 120A application

Chinese part substitutions are not about "getting them cheap". Its all part of Made in China 2025 plan/program. Companies are getting subsidies for using domestic parts, very smart and clearly effective.

hey man ! it is horrible to listen to you ! As a German, I literlerly understand no nothing !!! Firstly, you are talking way too fast man !!! Secondly, you are talking as if you were singing !!! That's very very bad man !!!! I am damned to watch your video because there are not so much tutorials on the CH32V003 ;( Very sad !!! Please delete your ACC !!!

One of the assembly houses I know in Shenzhen said there's an embargo on importing 'western ally' components. So Japanese, Taiwan, US and European made components are difficult to get without a big bribe.

118 strands

CA is fine except for the problems the entire US is having. Stop watching fox news clips!

@27:58 in the video. The reason they are not using a blocking cap on the battery side is because the voltage is not high enough to overcome the losses. You would need a very large cap bank on that side to break even. In the end, it's just better to omit the cap all together. Remember that the current has to go through 2 sets of MOSFETs. So if one set shorts out, the current sensor can shut down the other set of MOSFETs and break the circuit.

4.5k retail for simple Hugo model is too much, the question is how much does it really cost removing all dealers and a profite chain..

Appreciate the inverter power topology diagram. Interesting. Thanks. Like you said, the drivers must be super critical- if two opposing switches accidentally overlapped, bang- game over.

Great video. At the moment I'm mostly wondering what will happen if you put the traces inside the inner layers and put the ground planes on the outsides.

When was this made? I am curious is this was a covid supplier issue.

wow let me get my popcorn for the show! do more teardown on grid connected inverter!

What's the image handling software Dave is using in this video?

The battery side of the HF transformer has no blocking capacitor as it is a phase-shift full bridge topology. A blocking cap would create an LC resonant circuit with the leakage inductance of the transformer. It needs a proper square-wave waveform to moderate its power flow. Infineon make an engineering sample PSFB DAB design.

Another day, another company doing bait-and-switch on electronics components.

Ads ruin everything

Another one hung low solar inverter. Save your money and buy a Tesla Powerwall !.

I almost bought one instantly before watchign the rest of your video xD

Where are the MPPT boost input filter capacitors? All I can see are a couple of grey film caps, maybe 5 to 10uFs tops? The Solar array current spec is, I believe, up to 13A or so; typically you'd design the inductor ripple current of a boost convertor to be around 30% of the average so perhaps 3A peak to peak. Unless the switching frequency is insanely high or the boost inductor is exceptionally large I wouldn't have expected 10uF to be anywhere near enough to avoid an amp or more of ripple through the entire PV array. That wouldn't be good for efficiency and terrible for EMI. Several hundred nH of wiring inductance is also going to make things interesting. Also where are the bus caps? Obviously I'm missing something here...

An explanation of the DRM interface. A key requirement of AS4777. 2 is Demand Response Mode (DRM) defined in the standard AS4755 Demand Response Standard which enables the inverter to respond to signals sent to it remotely. These signals trigger the inverter to change the mode of operation, potentially turning it off, on, or ramping the output up or down. To allow the electricity network operator to better manage the grid. The RJ45 would be connected to a ripple receiver (decabit/K22 signalling receiver) this device is usually provided by the local distribution network provider for the local area, the RJ45 interface board is simply monitoring contact closures from an attached receiver. DRM modes are: DRM 0 - Operate the disconnection device, DRM 1: Do Not Consume Power, DRM 2 Do not consume at more than 50% rated power, DRM 3 Do not consume at more than 75% rated power / Source reactive power if capable. DRM4: Increase power consumption. DRM 5: Do not generate power. DRM 6 Do not generate at more than 50% rated power, DRM 7: Do not generate more than 75% of rated power AND Sink reactive power if capable, DRM 8: Increase power generation. DRM modes DRM 1, DRM 2 and DRM 3 are also commonly used for controlling domestic loads such as air conditioning. EEVblog 1283- What is Mains Ripple Injection? czcams.com/video/Po4b7JhpxKQ/video.html

It's too bad they don't make these things more serviceable. Instead of boards and wires going everywhere it should just be modules that pull out.

So the solar panels are live! As well as being high voltage themselves. Spicy!

The round transformer is wound with Litz Wire, and used for higher frequency systems. We used this for frequencies above about 250KHz. That's why youre seeing the fast rectifiers. Vishay is actually a good brand.

So how do you know you have one of two bad relays so far to avoid having two? Amazing how all the power goes along a PCB though.

Why there is no SiC + GaN inverters on a market?

@35:35 The other advantage of series relays is, IF they both open at the same time (or VERY close to it) it reduces or eliminates the arc across the contacts. The path between the two is effectively isolated when they open, so no place for the arc to go.