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" <[EMAIL PROTECTED]> 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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