Skeptical of this 1000watt Inverter Board

SolarPowered
SolarPowered Solar Expert Posts: 626 ✭✭✭
in Advanced Solar Electric Technical Forum #1
So there is this company on ebay that claims they are selling a 1000watt inverter board. The price looks dirt cheap and looking at the circuits required for it, to me it seems like a 500watt board for a 1000watt peak surge.

Anyone deal with this type of board to know what I am really looking at here? Seems like shady sales to me.

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  • NorthGuy
    NorthGuy Solar Expert Posts: 1,913 ✭✭
    #2
    Re: Skeptical of this 1000watt Inverter Board

    This is just a board without any parts soldered on it.
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  • SolarPowered
    SolarPowered Solar Expert Posts: 626 ✭✭✭
    #3
    Re: Skeptical of this 1000watt Inverter Board
    NorthGuy wrote: »
    This is just a board without any parts soldered on it.

    I know its just "the Board" as the title of the thread says.

    This is what it looks like with all the assembly parts for $128 shipped. Seems a little to inexpensive, the torroid doesn't look big enough and the Uf capacitors, don't meet the criteria.

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  • NorthGuy
    NorthGuy Solar Expert Posts: 1,913 ✭✭
    #4
    Re: Skeptical of this 1000watt Inverter Board
    SolarPowered wrote: »
    This is what it looks like with all the assembly parts for $128 shipped. Seems a little to inexpensive, the torroid doesn't look big enough and the Uf capacitors, don't meet the criteria.

    I wouldn't buy a board and use kit parts to replicate a Chinese inverter. If you want to do that, order an assembled board.

    You can buy a kit and then replace parts that you don't like before soldering. Or you can buy all your own parts which meet your longevity/power requirements.
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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #5
    Re: Skeptical of this 1000watt Inverter Board

    that "kit" is going to need heat sinks, and some sort of thermal feedback control. IS it sine wave or mod sine ? Then you need a case & a fan and ..............
    Powerfab top of pole PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
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    solar: http://tinyurl.com/LMR-Solar
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  • SolarPowered
    SolarPowered Solar Expert Posts: 626 ✭✭✭
    #6
    Re: Skeptical of this 1000watt Inverter Board
    mike95490 wrote: »
    that "kit" is going to need heat sinks, and some sort of thermal feedback control. IS it sine wave or mod sine ? Then you need a case & a fan and ..............

    Its sold as a sine wave. The test results show that it is of a 60hz sinewave. I highly doubt however with one torroid of that size and the capacitors that it is barely making 500watts continuos, it almost appears to be a 350watt pure sin wave sold as a 1000watt according to the circuit layout.

    Here is a pic of what a true inverter 1000watt should look like, and this is just from a Modified wave inverter, which can accept the processor (micro controller chipset) to convert the wave to pure sine wave.
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  • mtdoc
    mtdoc Solar Expert Posts: 600 ✭✭
    #7
    Re: Skeptical of this 1000watt Inverter Board

    You can get the board only for $8.99 from ebay HERE. It would be a fun learning exercise to put one together.You could probably scrounge most of the parts from junk electronics or buy the parts new for less than $50. Hmm ... Maybe I'll add it to my list of electronics learning projects.

    But I don't think I'd want to use it for any critical inverting task.....:roll:
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  • SolarPowered
    SolarPowered Solar Expert Posts: 626 ✭✭✭
    #8
    Re: Skeptical of this 1000watt Inverter Board
    mtdoc wrote: »
    You can get the board only for $8.99 from ebay HERE. It would be a fun learning exercise to put one together.You could probably scrounge most of the parts from junk electronics or buy the parts new for less than $50. Hmm ... Maybe I'll add it to my list of electronics learning projects.

    But I don't think I'd want to use it for any critical inverting task.....:roll:

    The board layout is better suited for Micro Inverter function. If you analyze the board, and processor it has all the basic components needed for a micro inverter. I believe to label it 1000watts seems a little over rated. This board seems to be stackable for parallel applications, so maybe it could function up to 1000watt, but the board appears to be a 350watt board from most of the boards I look at . I've already put together pricing on most of these parts for larger torrid (torrid alone is $35), Mosfets ($5 each),capacitors ($3.75 each) from frys electronics, however the vendor says you have to buy the board before he/she is willing to divulge the information for the processor (processor is around $45) which is the most important function of the pure sine wave. Without the processor its just junk.
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  • mtdoc
    mtdoc Solar Expert Posts: 600 ✭✭
    #9
    Re: Skeptical of this 1000watt Inverter Board
    SolarPowered wrote: »
    I've already put together pricing on most of these parts for larger torrid (torrid alone is $35), Mosfets ($5 each),capacitors ($3.75 each) from frys electronics, however the vendor says you have to buy the board before he/she is willing to divulge the information for the processor (processor is around $45) which is the most important function of the pure sine wave. Without the processor its just junk.

    Much cheaper to get parts through Digikey, mouser, Arrow or even ebay. Sub $1 for caps (maybe a bit more for the 2 large filter caps), $2-3 for mosfets. Toroids more but not $35 (likely less than $10). $45 for the MCU? Highly unlikely. Sub $5 likely - Do you know what it calls for? This doesn't exactly need highly sophisticated processing. Likey 8 bit AVR or similar. No more than $10 I would guess.

    OK Edit - now that I look closer it looks like it is using a " pure sine wave inverter on a chip". It's hard to see but it looks like it is using a daughter board with an EG8010. It does look like it puts out a true sine wave.

    You can buy the daugther board with chip installed for $15.99 on ebay HERE. In fact as you can see that listing links back to the same inverter board for sale. (oh - found it for $8.98 on ebay HERE )

    Or for $8.36 on AliExpress HERE. AliExpress also has the individual chips for $1.96 in lots of 5.
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  • udaya
    udaya Registered Users, Users Awaiting Email Confirmation Posts: 1 ✭
    edited July 2019 #10
    Input voltage (P3+ P4-) DC24V. JP2 bridge but U1 7812 Voltage regulator burnout. But it is working with DC12V JP3 bridge and without U1 7812. Any solutions ?
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  • boB
    boB Solar Expert Posts: 1,032 ✭✭✭✭
    #11
    The EGP1000W is missing a lot, even populated.  As per the schematic, there are no FET drivers, NO transformer, NO controller, no heat-sink, no current or voltage feedback circuitry, no overload protection, no a LOT of things.  i.e. all it is is a full bridge stage without a brain.   Maybe if you want to tinker ?

    Cheaper to buy a small-ish Chinese inverter.  They usually even work.

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  • unexpected
    unexpected Registered Users Posts: 30 ✭✭
    #12
    don't: https://www.youtube.com/watch?v=Dn2PFebi2ww
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  • NANOcontrol
    NANOcontrol Registered Users Posts: 276 ✭✭✭
    #13
    One caution, some of the components are surface mount and I can't figure out why. There is plenty of board space for thru hole. Surface mount adds another layer of difficulty.
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