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Thread: MEP-002A and -003A main breaker

  1. #41
    4 Star General Triple Jim's Avatar
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    I exercised my MEP-003A today. While it was powering my house's normal loads, I let enough air out of the tank to make my 5hp compressor start. It's an industrial compressor with a real 240V 5hp 1725 rpm motor that is rated at 24 Amps at full load. It started and ran OK, although you could tell that it started a little slower than when on commercial power. The breaker on the 003A did not trip.

    Based on this and the posts earlier in this thread, if the breaker on the generator trips too easily on surges, I'd suspect something is wrong with the fluid-delay type breaker.

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    Default Former Townie

    I have recently purchased a MEP003A that had been setting outside for several years. After new starter and batteries I was able to start it only to find it's not generating. I have spent some time studing the schematic and checking continuity oflot's of wiring and have yet to find any opens or shorts. I am beginning to suspect the gen is the culprit. Is there an easy test for this. Make it easy, 24V is about as high as this 40 yr heavy equipment mech is familiar with.

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    General sewerzuk's Avatar
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    Quote Originally Posted by keen4007 View Post
    I have recently purchased a MEP003A that had been setting outside for several years. After new starter and batteries I was able to start it only to find it's not generating. I have spent some time studing the schematic and checking continuity oflot's of wiring and have yet to find any opens or shorts. I am beginning to suspect the gen is the culprit. Is there an easy test for this. Make it easy, 24V is about as high as this 40 yr heavy equipment mech is familiar with.
    Probably best to start a new topic on this...as it doesn't really pertain to the main breaker issue
    But the most likely culprit on an -003a is a bad VR board.
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    Was it ever resolved if MEP-002a and MEP-003a gensets that Sewerzuk had troubles with air compressors (or other large hard start loads in 240v) had actual breaker problems or required "adjustment" of some kind?

    I'd hoping that MEP-002a that I plan to purchase will handle my 3 ton A/C for house if load is managed with slow start by the A/C unit (ie may need to install hard start kit). Any users with MEP-002a successful in running their A/C units? Others having breaker trip problems like Sewezuk?

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    General jbk's Avatar
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    i had similar thoughts this year posted a thread. i wanted to start 2 1/2 or 3 ton central unit with the 002. rla was the killer. 17 240 amps to run but the rla was 112 240 no way the 002 would do it. i used a 003 for this ac this hurricane season and it made the meter jump real good. so check your spec. on the ac some of the older units have just 2 times to run surge.
    mep-003a X2
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    Jim,
    Are you sure "rla" of 112 or "lra" of 112? what size breaker is the central unit on?
    Jerry
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    General jbk's Avatar
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    i think your right jerry. i dont recall the breaker size it was my daughters house. i just know this was the max. surge of the ac, 112 amps 240. 17.6 to run
    my old 4 ton unit states 26amps to run and 46 surge.
    mep-003a X2
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    Mine is 19.6 and 118 on the ac, 17.5 and 72.5 on heat pump. I haven't tried the heat pump on the 002a, but plan to.
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    Thanks so much to Speddmon, Ike, Sewerzuk, JBK, Storeman, etc. for sharing all your experiences and knowledge. You guys are awesome!

    I've spent last 2 days reading EVERY post on MEP-002a and MEP-003a so some of this info swimming around upstairs . . . . it was around 29 pages of 20 posts per page x number of pages in all those posts!

    Ran thru calculation that Speddmon provided for my specific 3 ton A/c which is 13.4 RLA and 78 LRA. That equates to 1.73 x 208 x 78 x .8 / 1000 = 22.45 Kw Thus, looks my best bet is trying MEP-003a if I hope to run 3 ton A/C on house with MEP-003a as backup generator. The little MEP-002a just won't cut it.

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    Default MEP-002A and -003A main breaker

    This is a very interesting post.

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