multiple SW inverters on a small AC source [RE-wrenches]

[hugh piggott]

<x-flowed>Jay
>
>Should work no problem.  Just make sure you set the AC2 size carefully so
>you don't overload it.  Then when the loads on the inverters is larger
>than the AC2 input, the inverter will help it.

thanks for the reassurance, that is how I plan to run it, but theory 
is often different from practice.  I have connected 2 sw2512's to a 
15kVA genset before but this is a smaller source and I worry about 
instability.  A friend who knows a bit about control systems tells me 
that the inverter current regulator softwares will interact through 
the common supply voltage.  I hope he is wrong.

>I'm curious, what type of regulation are you using?  Killer site!

  I plan to use an induction motor with capacitor compensation (I have 
good experiences with this).  The regulators I use are very nice PWM 
voltage regulators made by Smith Associates for the purpose.

I also worry about the power factor implications of using induction 
motors with the trace sw's.  If you change the power factor the 
frequency of the hydro will also change.  On those induction motor 
systems a motor start (fridge etc) can hit the capacitors and reduce 
excitation of the motor, leading to slight overspeed and thus a shift 
in frequency.  This might result in the Traces rejecting the AC 
source.

It'll be fun anyway :-)
-- 
Hugh

Scoraig, Scotland
http://www.scoraigwind.co.uk

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