ST & DR vd. SW [RE-wrenches]

[Travis Creswell, Ozark Solar]

What I did was to prove that you could produce more usable/sellable kWh's
with the same array for less money.  I'm not proposing that we actually
promote this as a solution or retrofit.  I think that grid tied for
residential is a bad idea when there is so many other opportunities in that
same house to save a lot more kWh's for a lot less money than selling power
back to the grid.

If I was to install a DR and a ST I would make no effort to ever charge the
batteries from the solar.  Why bother, the DR has a built in charger? The
batteries are not there to be charged from solar, they are there to back up
the critical loads in the house for a day or so.  99% of the power outages
in the US are less than a few hours.  The ST is there so provide as many
kWh's as possible for the house and to sell to the grid.

Again I proved that you can produce more kWh's with this set up for less
money than with a SW by itself.  Plus less complications and user management
is required in this set up.  

No matter what you do to a SW you cannot produce as many kWh's a ST (or any
battery less inverter).  The batteries pull the array off its power point
and you still are floating the batteries with the solar or other RE source.


I agree with Kurt that we just might be asking for two much from one piece
of hardware.

Travis


----------
>From: "Kurt Nelson, SunWise" <sunwise at win.bright.net>
>To: Wrenches <RE-wrenches at topica.com>
>Subject: SW again [RE-wrenches]
>Date: Thu, Oct 19, 2000, 7:58 PM
>

>I don't think we should have to sell two inverters, especially when we
>are so close with the SW.  If we are going to ignore this inefficiency,
>then I believe we need to take a closer look at the Omnion product and
>others.  Also, how do you propose switching PV to and from a batteryless
>ST or SW, while providing DC to the DR or or SW other house inverter?

----------
>From: Phil Undercuffler <phil at positivenergy.com>
>To: RE-wrenches at topica.com
>Subject: Re: Piss poor Trace SW preformance in "sell" mode. [RE-wrenches]
>Date: Thu, Oct 19, 2000, 4:31 PM
>

>perhaps its not a good idea to ask one
>piece of hardware to do too much. 

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