Combining SQFlex PV direct with grid tie [RE-wrenches]

[Matt Tritt]

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Hi Travis and Kurt,

Wouldn't a better method be to use a smallish battery bank with a 
grid-tied OB? That way you could use a DC pressure pump to draw from a 
cistern into your PT and not have to be concerned with loss of water 
pressure.

Matt T

Travis Creswell wrote:

>Hi Kurt,
>
>We've looked at the same thing several times and only came up with similar
>"kluges" so we opted to power the pump with AC and get the largest pressure
>tank the available space would hold.  80-120 gallons of reserve will get a
>conserving house though a 24hr power outage.  The large spun fiberglass
>pressure tanks are readily available for less then $500.
>
>Don’t forget you can't guarantee the sun will be shining during the power
>outage so you're still limited by the amount of water stored in the pressure
>tank.
>
>Travis Creswell
>Ozark Energy Services
>
>
>-----Original Message-----
>From: Kurt Albershardt [mailto:info at es-ee.com] 
>Sent: Sunday, June 17, 2007 2:01 PM
>To: RE-wrenches at topica.com
>Subject: Combining SQFlex PV direct with grid tie [RE-wrenches]
>
>
>I've thought about this type of application for awhile and it appears we now
>have a project that needs it:
>
>900-1000W PV array feeding an SQFlex with DC.  When the pressure tank is
>full, the PV is switches over over to a small grid-tie inverter (SB1100?) to
>sell power.  This way, there is always water pressure even when the grid
>goes down (several times per year out there) and water pumping takes
>priority over selling power.  I figured a DPDT Pumptrol would do the trick
>but I haven't located one of those just yet.  More complex control
>arrangements are possible of course, but would involve grid 
>powered relay coils and extra parts.  We could AC power the pump, eat the
>inverter losses, and provide a manual changeover (double throw safety
>switch) but it seems there ought to make this work correctly by default.
>
>Anyone tried this?  Possible AHJ issues as well, but those can be worked
>around sometimes.
>
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>8:23 AM
> 
>
>
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>  
>


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