[RE-wrenches] VFD drives

[jay]

Does anyone have even an crazy idea of why this engineer would say that VFD drives don’t like generators?

Besides the obvious, IE he doesn’t know what he’s talking about?

thanks everyone 

jay



> On Jul 11, 2024, at 11:22 AM, James Jarvis <jj at aprsworld.com> wrote:
> 
> There should be no issues. My rule of thumb is very hard starting 15 horsepower three phase motor will start and run with a quality 30 kilowatt three-phase generator. That's across the line starting with massive current. You can program your VFD such that there is no massive surge and so a 10 horsepower on a 30 kilowatt will be absolutely no problem.
> 
> -James Jefferson Jarvis
> APRS World, LLC
> +1-507-454-2727
> 
> (Sent from my phone. My apologies for spelling errors and brevity.)
> 
> On Thu, Jul 11, 2024, 12:07 PM jay via RE-wrenches <re-wrenches at lists.re-wrenches.org <mailto:re-wrenches at lists.re-wrenches.org>> wrote:
> HI All,
> 
> I’m being asked to comment about running a 10hp 3 phase well centrifugal pump off of a 30kw single phase generator with a VFD drive.
> This well pump is located in a tank for fire fighting applications, so its not down a deep well meaning almost no head pressure. And the start time can be quite slow as its not supplying a house/pressure tank.
> 
> 
> I”m not an expert on VFD drives, but I figure many of you are.
> 
> My question, based on the question from the engineer is:
> 
> 1. is there any issue with running a VFD off of a good quality 30kw brand new Kohler turbo propane generator?
> The engineer seems to think there is but he won’t say why. 
> 
> i can’t think of any reason at all?
> 
> This generator is only running this one load, the well pump.
> 
> jay
> 
> 
> 
> 
> 
> 
> 
> 
> 
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