grounding

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dougahole
dougahole Registered Users Posts: 13 ✭✭
in Off Grid Solar & Battery Systems #1
The charging system. Off grid, Honda e7000 generator, AIMS 4KW inverter. Generator is grounded at site, cable runs directly to inverter (grounded) as ac input, output from inverter to panel and grounded at panel. Inverter will not accept in coming power from generator. What is wrong with this picture? I am led to believe that it is a grounding problem but do not know how to correct it. Can someone provide a diagram and/or recommendations. Thanks
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  • Graham Parkinson
    Graham Parkinson Registered Users Posts: 160 ✭✭✭
    #2
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    Not really familiar with your equipment but usually you only want a system grounded in one location, typically at the panel.  Have you tried lifting the generator ground and seeing what happens - at least that would let you know if grounding is an issue.   Are there any ground fault circuits on the panel, generator or elsewhere?  They can get confused with two grounds.  Also, you need to check how your neutral is wired.  There are many posts on proper neutral connections and bonding of neutral to ground (again usually only in one place, at panel).  Sometimes generators come bonded and sometimes they are not so best to check.

    Offgrid in cloudy PNW

    MacGyver'ed museum collection of panels, castoff batteries and generators - ready for state of art system install .... parade of surviving and dead generators: H650, Ryobi 900, Briggs and Scrap Iron 2000, H2200, H3000, Kubota 3500, Kubota 4500, Onan 7500

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  • mcgivor
    mcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    #3
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    Is this the same problem  from November of last year which is unresolved?  The internal neutral ground bonding required by OSHA for use on job sites most likely is the issue, the pdf attached explains how to remove the bonding when using a transfer switch, which an inverter charger has, it's a little dated and perhaps doesn't cover you exact model, but still relevant.

    Also heed the advice from @Graham Parkinson above.
    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery with Battery Bodyguard BMS 
    Second system 1890W  3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.  
    5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
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