[Elecraft] OT: Whole House Generator - Update

[Dr. William J. Schmidt]

Well there can be a little more to it. With the larger systems there is phasing circuitry (in the generator or the transfer switch:  i have both) to detect and switch at zero cross-over point for "bumpless" transfer of power.  Causes the least amount of surge and damage. 


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ
 
Owner - Operator
Big Signal Ranch – K9ZC
Staunton, Illinois
 
Owner – Operator
Villa Grand Piton - J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com

email:  bill at wjschmidt.com
 

> On Sep 9, 2017, at 2:36 PM, Charlie T, K3ICH <pincon at erols.com> wrote:
> 
> It's Generac "Synergy" not syntergy
> And yes, they just came out with them as their own version of the inverter
> type generator.
> I've only seen it listed on a few of their dealers so far.
> 
> There's nothing magic about wiring a transfer switch. In the larger systems
> of about 7 - 8 kW and higher, think of it as a remote sub-panel that might
> for example, be in a garage and fed out of your main house panel through an
> appropriate sized breaker, but with a two way switch for the Line In that
> selects either the line from the main panel or, the generator.
> This applies whether it is manually operated or fully automatic.
> All the control switching logic comes from the manufacturers circuitry.
> 
> The whole idea is to NEVER permit your generator output finding its way out
> to your main feeders. (You could electrocute a Lineman working on what he
> thinks is a dead line.  That pole-pig outside works both ways.  You apply
> 240 V on your side and there is 7½ or higher kV on that deadly wire!)
> Unless there is a massive failure in the switch itself, this can never
> happen.  Most of the ones I've seen are WAY overrated for just that sort of
> safety margin.  My panel came with a 15 kW generator, but has a 200 Amp
> transfer switch.  The commercial power input is completely dis-connected
> from the generator much the same way as a DPDT switch's outer contacts never
> touch.
> 
> In some of the smaller transfer panels, each house circuit has its own two
> way switch such that you have to manually switch it from mains to generator
> and back when the juice comes back on.  This works fine too and isolates the
> generator output.
> 
> 73, Charlie k3ICH
> 
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Doug Hensley
> Sent: Saturday, September 09, 2017 1:44 PM
> To: Elecraft List <elecraft at mailman.qth.net>
> Subject: [Elecraft] OT: Whole House Generator - Update
> 
> Someone on the list suggested we post a summary of private responses to us
> as an alternative, I'm guessing, to members not knowing what was said.   In