[RE-wrenches] Integrating with a whole house generator

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The XW would have the inverter by-pass breakers assembly if you installed it
w/ the conduit box, so the second transfer switch is not necessary. 
Reset your gen AC "transfer" cycles to their minimum as well as your
generator low voltage parameters to 110 volts (IF it is a quality gen set &
it produces a constant 120V), you should see no more lag transferring off
the gen.Make sure you reset the settings in ALL the VFXs.

-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Geoff
Greenfield
Sent: Tuesday, November 25, 2008 9:39 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Integrating with a whole house generator



It all depends on the homeowners expectations (and what THEY think is a
reasonable critical load).  Your scheme looks like it would work - (I might
include a second X-fer switch to run the inverter supported loads off the
genny if the grid AND the inverter are out).

 

Second issue is transfer speed and power drop out.  I am not sure of the XW,
but I have found that outback is a very quick and clean switch (no
computer/com drops) from grid to backup... like a UPS.  However... it is NOT
as smooth when turning off the genny on back up mode.  Lights all fade as
genny coughs off and inverter kicks back over to batts.  I always make sure
customer computer has a deadicated UPS.



For a brighter energy future,

Geoff Greenfield
Founder and CEO
Third Sun Solar & Wind Power Ltd.
340 West State Street, Unit 25
Athens, OH 45701

740.597.3111     Fax 740.597.1548
www.Third-Sun.com

Clean Energy - Expertly Installed







----- "William Miller" <wrmiller at charter.net> wrote: 
> Friends:
> I am bidding an installation in which the customer owns a whole house 
> generator.  The generator is 30 KVA and we will be installing a 4.5 or 6.0

> KVA XW system.  Obviously, the inverter will not power the entire 
> house.  If we segregate the non-critical loads and connect them to a 
> grid-fed panel, the generator will not power them.  If we let the
generator 
> run every time there is an outage, this negates the need for a inverter 
> system. What to do?
> The transfer switch sends a two wire start signal to the generator upon a 
> grid outage.  After the transfer switch senses generator voltage, it 
> effects a transfer.
> My brainstorm is to intercept that two wire start signal.  I will connect 
> it instead to the XW inverter.  We will segregate the loads, feeding the 
> critical loads from the XW and the Non-critical loads from the output of 
> the transfer switch.  In the case of a grid outage, the critical loads
will 
> receive uninterrupted power.  The Non-critical loads will not have power 
> unless the generator is started by the XW.  Once the XW (or the home
owner) 
> starts the generator, the transfer will occur.  We will put a control
panel 
> in the house so the home-owner can start the generator if the No-critical 
> loads are needed.
> This seems clever to me, but I am biased.  Am I missing something???
> William Miller
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