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Teardown and testing of an 800W PureSine inverter

Posted on Monday, October 2nd, 2017 in Teardowns by DP

inverter1-600

Kerry Wong has posted a detailed teardown and testing of a Reliable Electric 800W PureSine Inverter:

The last ingredient for my backup power project is an inverter. Since the battery bank I built is a 12V 1.5kWh one, an inverter that can handle a load between 500W and 1000W would be a suitable choice. In theory, all the lights and the refrigerator in my house consume just around 500W. So the 1.5kWh battery bank should be able to power all the essentials for at least a couple of hours in the event of a power failure.
I wanted a pure sine wave inverter as opposed to a modified sine wave inverter since many household appliances and electronics do not play well with modified sine wave inverters due to the high harmonic distortions. After some extensive research, I finally settled on this 12V 800W pure sine inverter made by a little known Chinese company Yueqing Reliable Electric Co. Ltd.

See the full post on his blog.

Check out the video after the break.

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2 Responses to “Teardown and testing of an 800W PureSine inverter”

  1. Drone says:

    Yeah, Kerry D. Wong said in his Blog Post:

    “And as you can see in the pictures below, all the critical capacitors used are brand-named Nichicon ones and no corners were cut there.”

    He provides only one small pic of one Nichicon cap, and a link to the Nichicon home page (only). I think Mr. Wong knows better than to make a sweeping statement like that…

    Unfortunately, Mr. Wong didn’t provide a link to this Nichicon page in his post:

    http://www.nichicon-us.com/english/products/

    Which CLEARLY states:

    ALERTS……Customers Beware
    Counterfeit Nichicon Products
    To all Nichicon customers,

    Recently it has been reported that counterfeit Nichicon capacitor products are turning up in the market. These counterfeit products are not produced by nor guaranteed by Nichicon. They are of inferior quality and could cause end product failure as well as possible safety hazards.

    In order to protect your company, do not use counterfeit parts. Only use genuine Nichicon products purchased from an AUTHORIZED Nichicon distributor or Nichicon sales office.

    If you have any concerns as to the authenticity of any Nichicon product please contact your local Nichicon sales office for support.

    I’ve run across FAKE Nichicon binned retail caps in the past both in Singapore (Sim Lim Tower) and Indonesia (Glodok). They’re likely from China.

    Chinese fake parts are getting so good (especially high quality brand capacitors), even having real reference parts for comparison on-hand when buying locally is no longer reliable. Electrical testing is also dicey. A fake will test “good enough” against a known good reference to be inconclusive. But months or years later, YMMV :-(

    Given the Chinese origin of the inverter he’s planning on using, I recommend he re-cap the thing with known good parts (sourced from reliable distributors) before deploying it long-term.

  2. KH says:

    But it’s not loaded daily, probably the inverter would only run during (1) normal charge cycling ops and (2) power interruptions. Doesn’t sound like a duty cycle that would hit the caps hard. I’m thinking I would run it say 2 years on original caps, then check.

    My rationale: Never had any trouble with caps on PC UPS units, I’d say they are spec’ed good for a 2 or 3 year warranty period and using a unit beyond that (usually by replacing the battery) depends on the amount of risk that one is willing to take. Also, one data point on authentic caps: a Panasonic low ESR cap placed in poor airflow in a cheapish desktop PC PSU bloated (rated 1000uF -> measured 280uF) in almost exactly 4 years. So authentic caps in a poor design will still die a few years beyond warranty period, much like its cheapo counterpart. I would open up the thing every year to clean dust inside, clean the fan blades, and check cap bloat.

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