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Forum Index : Electronics : What can I expect from this transformer ?
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| hary Regular Member  Joined: 15/04/2019 Location: FrancePosts: 89 |
BenandAmber, where did you get your capacitor from ? Man, I haven't noticed your huge toroid ! It's very high, like 20cm (8inches) high compared to diameter. So you stacked 4 like my small one ? |
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poida Guru  Joined: 02/02/2017 Location: AustraliaPosts: 1419 |
This is amazing, it's getting to the stage of "well, what does it take to break these things?" Don't bust it with some stupidly big load! That would be unfair. We need to enjoy the benefit of discovering something that works well and is affordable and can perform well past reasonable expectations. [thanks] You are welcome, Ben and Amber. I ask, imagine how the larger inverter boards are going to perform, when set up properly. The boards with 3 or more HY4008 per leg of the bridge. wronger than a phone book full of wrong phone numbers |
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| Solar Mike Guru Joined: 08/02/2015 Location: New ZealandPosts: 1138 |
Calb SE200 each weighs 5.7Kg, guys use them over here to retro fit Battery system into to EV car, good for 200A continuous load. 230vac motor has brushes, old tech, think the new DC battery versions are brush-less. Prob a 1kw sized xfmr would be ok here, its the start surge that's the issue, the old 3.5KW HF sine inverter currently shuts down, good excuse to make a smaller inverter and try out some different ideas.. Mike |
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| BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961 |
I have an old APC breaker on the output of it that says it's for 20 amps But with my amp meter I have seen 26 amps maybe a little bit more just for a few seconds but at 17 or 18 amps over a minute and it'll kick It won't kick at all at 16 amps no matter how long I run it The voltage is a little bit higher than it should be about 124 volt And 80 amp dc breaker was the smallest I had it's on the battery input and it's never flipped I'm beginning to wonder if it works be warned i am good parrot but Dumber than a box of rocks |
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| poida Guru Joined: 02/02/2017 Location: AustraliaPosts: 1419 |
sometimes an AC breaker will lock on and stay on, no matter the current when driven with DC. I had a small 16A breaker that just glued itself ON and no moving of the switch by hand would open it. This was due to large DC current passing through it. Cheap DC breakers are available from (you guessed it!) China, on aliexpress. I use the 63A DC breakers on the DC supply side of my house inverters. They seem to work OK. wronger than a phone book full of wrong phone numbers |
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| hary Regular Member Joined: 15/04/2019 Location: FrancePosts: 89 |
I was going to order some but wanted an MX coil, a device you can remotely trip the breaker when you energize the so called MX coil. I was not able to find. waiting to find some (DC breaker+MXcoil), I'm using fuses. They would work AC, DC and have very high short circuit cut off ability. You always need to be careful when using high current, and even more with high DC current ! |
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LadyN Guru Joined: 26/01/2019 Location: United StatesPosts: 408 |
If you are interested, we can design an electronic fuse together. It will be able to monitor the amount of current flowing both ways and you will be able to trip/reset it remotely over WiFi. The power control board will cost around $5 and the uC will cost depending on what you want. Since I like ESP32, it will cost $5, so for total $10, we can build this electronic fuse together. This will be all solid state with a redundant regular onetime fuse back up. Let me know what you think and how this could be useful or not |
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| hary Regular Member Joined: 15/04/2019 Location: FrancePosts: 89 |
You mean together or you would do for me ? I appreciate very much the offer but I'm scared, I don't have proper electronic knowledge for designing/making a proper security device ! And I already have microC solid state monitored "breaker". I don't trust SSR based breaker that much for security system. I've seen some solid state relay burning staying closed, burning almost every thing. It was just a chance the entire device didn't catch fire ! Even these Chinese rearm-able breaker are very nice and practical, but for high DC current, I feel more comfortable with old fashion fuses. Only the MX coil feature, that I haven't been able to find till now, would make me change for them for practical reason. Plus I've already so many thing on the stove right now, I can't disperse my so little energy in all direction. I now need to focus on that inverter and also find a reliable DC24V water pump. |
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| BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961 |
The only thing I have not started with mine is the air compressor I think it would start it it just probably wouldn't cycle it When I get a few extra minutes I will finish the 24 hy4008 board Now that I know a little more I think it is just overkill More parts to fail when I came into this I thought bigger was better I'm sure this is a common mistake As hard as it may be I think anyone getting into this should talk to some of the people likes on this forum first it just might save them a lot of money time and aggravation Hope poida chimes in with his thoughts On it being Overkill or not be warned i am good parrot but Dumber than a box of rocks |
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| hary Regular Member Joined: 15/04/2019 Location: FrancePosts: 89 |
By the way, where do you get your HY4008 ? RS, Digikey, nor Mouser have them. Plus they're quite pricey from eBay china ! |
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| LadyN Guru Joined: 26/01/2019 Location: United StatesPosts: 408 |
We source from AliExpress. Components could be suspect but we are in the prototype stage so no mission critical items yet. My first 10Pcs HY4008P purchase cost $4.1 shipped |
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| BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961 |
 I bought a hundred of them off of AliExpress this is where I bought mine I don't know if the guy sells fakes but the ones I got was not fake someone put up this link and said that they were not fakes and was real so I jumped on it I guess fakes is a real big problem so you might want to check with someone else to make sure that you're ordering off somebody that is not selling fakes That's why I was wanting to send you some four diodes and four would not weigh very much Surely I can find some shipping that wouldn't be crazy It is my duty and obligation to help other people out Not only because of my personal beliefs I have had others on here that have sent me stuff and been really good to me and they told me to pass it on And I plan on doing that every time I get a chance One of the greats on here that you've already been talking to spent a lot of money and sent me some really nice things And another one of the greats that you haven't talked to yet but when you get to talk to him you'll find out how great he is has sent me stuff also So it is not a problem at all to send you something especially if you can't find any mosfets that you know are not fake be warned i am good parrot but Dumber than a box of rocks |
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| hary Regular Member Joined: 15/04/2019 Location: FrancePosts: 89 |
Do you get them in TO-247 package ? No worries BernandAmber, you're already helping a lot and for sure I'll solicit you more later on ! You just scare me when you say you did buy 100 units ! By the way, where did you get your big 18000uF/80V capacitors ? Sourcing part is really part of the learning too, indeed ! |
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| BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961 |
  This guy bought out a inverter company that went bankrupt these capacitors was originally to be used in inverters He sells them by the case also and yes 247 that is the size that originally came in my little inverter board like yours But you may want to make sure that's the size in yours You can find cheaper capacitors but I don't know how how to tell the difference between the ones that are good for inverters and the ones that are not so I bought these knowing that a company chose them for the inverters they were building be warned i am good parrot but Dumber than a box of rocks |
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| LadyN Guru Joined: 26/01/2019 Location: United StatesPosts: 408 |
I THINK: 1. ESR at the expected nominal temperatures 2. Ripple rating at the nominal frequency .. are good heuristics |
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| Warpspeed Guru Joined: 09/08/2007 Location: AustraliaPosts: 4406 |
Hary, Good advice from Poida, I have had the welded together contacts problem myself. Just order a proper two pole dc rated circuit breaker. That will prevent the welded contacts problem. Then quite separately order a shunt trip, with a suitably rated coil voltage. That will then fit onto the side of the dc circuit breaker. There will be a small pin at the side that links the two together mechanically. I am using a system like that for my battery isolator, it has a shunt trip that is activated from a programmable voltmeter that detects battery under voltage or over voltage.  Cheers, Tony. |
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| BenandAmber Guru Joined: 16/02/2019 Location: United StatesPosts: 961 |
Harry you're in really good hands now you have gotten the attention of two of The greats what they tell you is as good as gold I would like to know more about this battery isolator is this something that could be used with two battery Banks that's not the same type of battery but have the same voltage I think this is ongoing problem Weather at be not wanting to mix new and old batteries or not being able to get any more of the same type of batteries be warned i am good parrot but Dumber than a box of rocks |
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| poida Guru Joined: 02/02/2017 Location: AustraliaPosts: 1419 |
I tend to think a huge inverter with 24 FETS is a problem. The problem is now the single output of the IR2110 needs to drive 6 FET gates and drive them in a way so they all switch on or off together. A 4 FET board (the Little China Board) has the IR2110 driver needing to switch one FET only. My view is the 24 FET board is not going to be 6 times more powerful than the 4 FET board. It might be. But I think there will be exciting times in the shed when you apply 6x the load to the 24 FET board. It's always a matter of ensuring each FET gets a fast and proper switch on or off drive sent into the gate pin. Some FETs will switch on or off before the others and so the load will never be evenly shared over all 6, in my view. I would probably rate the 24 FET board as maybe only 3x stronger than the 4 FET board, to leave a safety margin. Repairing the 24 FET board will be a chore. At the least I would expect you to have to replace 12 FETS, and the EGS002 card. Maybe the totem pole driver transistors will pop too. Every time when my boards blow I need to replace the low and high side FETS of one 1/2, maybe both halves. And the EGS002. And sometimes the high current track blows near the current sense wires are located. wronger than a phone book full of wrong phone numbers |
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| Warpspeed Guru Joined: 09/08/2007 Location: AustraliaPosts: 4406 |
Its just a two pole on/off switch for the battery. In the off position the 100v battery is completely disconnected from everything else, and I can touch or work on any battery terminal without there being the chance of electric shock, or shorting down to ground with my big shiny steel spanner. Because its also a circuit breaker, it will trip if the battery current is excessive. I have added a shunt trip coil to it, so that the relay contacts on a programmable voltmeter can trip the circuit breaker if the battery voltage becomes either dangerously high or dangerously low. The Lithium battery is a rather expensive piece of hardware, and it only takes one accidental overcharge or over discharge to permanently damage it. So its well worth building in several layers of protection. The battery isolator is the very last resort protection if other layers of protection also fail. Cheers, Tony. |
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| LadyN Guru Joined: 26/01/2019 Location: United StatesPosts: 408 |
I did have a question about parallel connection of multiple HIGH current mosfets like the HY4008P. These HY4008P are 200A rated. My understanding is that mosfets are typically connected in parallel to increase their load carrying capacity - is that right? However, in this case, this does not seem to be serving that purpose as one HY4008P is more than capable to pass enough current. So, in this case, are the HY4008P being connected in parallel to decrease the thermal stress over each individual component and "spread around" the heat produced? I am happy to relocate this post as a separate thread/question since it's offtopic. |
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