Non Linear Loading Gen Sets [RE-wrenches]

Kurt Albershardt info at es-ee.com
Mon Jun 30 15:04:05 PDT 2008


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Is the genset wired for 3-phase?  If so, the nonlinear loads issue is a big one (as in melted neutral conductor.)  In single phase operation, nonlinear loads pose far less of an issue, though power factor will play a part in useable genset rating.



--On Monday, June 30, 2008 2:53 PM -0400 Dan Brown <Cvsolar2 at aol.com> wrote:
>
>
> Hi;
>        I just installed a good sized off grid system that uses a 20k gen set
> as a Back up. Documentation for the Set was sparse, so i called the gen set
> manufacturer for advice -- like break in issues and the like. i got one of their
> tech. types that suggested i load their set right up for break in. i
> suggested we could do that by bumping up the charge rate on the inverters (yes the
> batteries can handle it). the tech. dude promptly flipped out, and went into a
> rant about non linear loading gen sets caused by chargers.   he said the problem
> is that chargers only use pieces of the wave form causing the gen set
> windings to heat - up among other things. he said they recommend a max. of only
> 15-20% nonlinear loading of their sets, and that i should load up the balance with
> linear loads (like heating elements), to balance the load on the windings.
> this is a new one on me folks. my gen. people suggest the guy might be smoking
> oregano, and instructed me to set up the system to operate just under the sets
> continuous duty rating. i.e. 80A,  (set is rated for 83.3A continuous). another
> colleague suggests the tech dude might be thinking of mod. sine wave inverter
> / chargers, and that good inverters don't chop up the wave form. i scope'd
> out the wave form under load and it looked good to me. seen worse. so the
> question is, has any one else ran into this issue? could oregano be making a come
> back? thoughts? thanks db
>
> Dan Brown
> President
> Foxfire Energy Corp.
> Renewable Energy Systems
> (802)-483-2564
> www.Foxfire-Energy.com
> NABCEP #092907-44








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