Gridtek 10 islanding with outback? [RE-wrenches]

[Geoff Greenfield]

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Thanks for the reply - also (obviously) I could approach this with an SMA
sunny island (right? lords of the red box?)

Further conversations with the customer have shed more light on the
situation. Instead of (as I assumed) being motivated by the value of having
stand by power during outages and a desire to max efficiency/production
during normal operation, the request for batteries is based on something
else entirely.  The rural co-op has let him go pure bi-directional net meter
for 3 years due to lack of policy and luck... they have now installed
computerized meters and sell him power at 10.6 cents and purchase it at 1.5
cents.  On average, his wind offsets 60% of his use.  he wants to "load
shift" (?) with a batt-verter system set up to power most of his 120 loads
from the batts and charge from the grid/wind AC...  needing some sort of
control to charge when the wind is exceeding household use, and obviously to
maintain the batts at some minimum should the wind hit the doldrums...

A design challenge for sure!


For a brighter energy future,

Geoff Greenfield
NABCEP Certified Energy Practitioner

THIRD SUN SOLAR & WIND POWER Ltd.
340 West State Street
Athens, OH 45701

www.third-sun.com
(740) 597-3111
------------------------------

Date: Mon, 25 Apr 2005 14:40:23 -0400
From: "Geoff Greenfield" <geoff at frognet.net>
Cc: "Swilke at Bergey. Com" <swilke at bergey.com>,
	<jholbrook at xantrex.com>,
	<ieter at bergey.com>
Subject: Gridtek 10 islanding with outback?



I remember and will delve into the archive to look for the appropriate past
discussion of setting up grid tie inverters with bat-verter standby
systems...  but-

Has anyone done or heard about doing this with a bergey/Xantrex Gridtek 10
wind inverter?  (240 VAC output - typically a double 70 amp breaker
backfeeding main panel.) I wonder about sizing the inverters... would
probably come up with a dump load scheme should the wind production exceed
loads (probably).

For a brighter energy future,

Geoff Greenfield
NABCEP Certified Energy Practitioner

THIRD SUN SOLAR & WIND POWER Ltd.
340 West State Street
Athens, OH 45701

www.third-sun.com
(740) 597-3111



---

------------------------------

Date: Mon, 25 Apr 2005 14:39:03 -0700
From: David Katz <david at aeesolar.com>
Subject: Re: Gridtek 10 islanding with outback? [RE-wrenches]



Hi Geoff,
This should work fine if the output from the Xantrex 10kw inverter is
connected to a sub panel that is also connected to the output of a pair
of outback VFX3648s. In the event that the wind output is greater than
6kw or so, and there is not enough load in the house to us up the
remainder of the power, the AC voltage will start to rise and the
Xantrex/Bergy inverter will turn off and wait 5 minutes.
Connect the AC input of the Outback inverter pair to a 240 volt breaker
in the main panel. This will connect the main panel to the sub panel as
long as the utility is functioning and it will open the connection when
the utility goes down. All of the critical loads you want to back up
should be connected to the sub panel.
David
David Katz
President, AEE Solar
formerly Alternative Energy Engineering
1155 Redway Drive - Box 339
Redway, CA 95560 USA
(707) 825-1200
(707) 825-1202
email: david at aeesolar.com
web: www.aeesolar.com

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