Hybrid PV/Battery/Generator [RE-wrenches]

Fri Jun 14 09:02:30 PDT 2002

Joel:

Please don't misunderstand me, I think it is a great concept for backup
power.  Why have a big battery bank and inverter sitting around doing
nothing for 99% of the time when you have perfectly good power system in
your EV ?

For now load shifting with lead acid isn't cost effective even at
California rates but it is getting close. Hopefully the EV driven
battery revolution will give us high cycling batteries at a reasonable
price.  

Has anyone tried load shifting this with NiFe (Edison cell) batteries ? 
Are new ones even available any more ?
Given the incredible cycling performance of NiFe, I wonder if they could
drop the round trip energy cost into the cost effective range ( < 20
/kWh with CA TOU net metering).  The main drawback of NiFe is the high
self discharge but in a daily load shifting application this probably
wouldn't matter too much.  

Best Regards,

John Berdner

SMA America, Inc.
20830 Red Dog Road
Grass Valley, CA  95945
530.273.4595 (voice)
530.274.7271 (fax) 

-----Original Message-----
From: Joel Davidson [mailto:joeldavidson at earthlink.net] 
Sent: Thursday, June 13, 2002 3:34 PM
To: RE-wrenches at topica.com
Subject: Re: Hybrid PV/Battery/Generator [RE-wrenches]

John, Don't be too quick to dismiss this concept. The guys at AC
Propulsion
are pretty sharp. I wish my Prius' 17 kWh (38 each 7.2V, 6.5 amp-hour)
nickel metal hydride battery bank had the bi-directional connection AC
Propulsion is developing. Picture this. Your house has a PV roof feeding
into an inverter and your service panel with a TOU meter. You pull your
EV
or hybrid into the driveway and plug it in. Grid or solar power charges
the
vehicle battery bank if needed. If the grid needs power during peak
periods, the utility signals all the plugged in vehicles and draws from
their batteries. If the grid goes down, your vehicle battery bank powers
your home. Too far out? So were solar roofs a few decades ago. Imagine
the
future and then make it so.

jberdner at sma-america.com wrote:

> Graham:
>
> Interesting idea but...
> Check out some of Tom Hund's (Sandia) work on this subject.
> As I recall, his conclusion was that the round trip cost for the
energy
> was about $0.35 per kWh.
> Not quite enough to make it worthwhile even with time of day net
> metering.
> Perhaps the economics will be a bit better with the advanced batteries
> in EV's.
>
> Best Regards,
>
> John Berdner
>
> SMA America, Inc.
> 20830 Red Dog Road
> Grass Valley, CA  95945
> 530.273.4595 (voice)
> 530.274.7271 (fax)
>
> -----Original Message-----
> From: Graham Owen [mailto:graham at solarexpert.com]
> Sent: Thursday, June 13, 2002 11:07 AM
> To: RE-wrenches at topica.com
> Subject: RE: Hybrid PV/Battery/Generator [RE-wrenches]
>
> Check out this website http://www.acpropulsion.com
> They are developing electric cars that charge up at night with grid
> power, then sell the power back to the grid during peak demand.  From
> what I have been told, the founder Allan Cocconi, is a genious when it
> comes to inverter technology.  I know this dosn't help with solar
> projects in the works now, but there is some intersting stuff on the
> site.
>
> Graham
> GO Solar
>
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