Grid tie with Diesels? [RE-wrenches]

[Geoff Greenfield]

Thanks Jeff - 

Is this based on experience?  If so can you give a rough description of the
project size and how it worked out?

Secondly, what is the $200K price for (to get the 42Kw in Parallel)?

Third- did it go down as I imagined - with wider operating windows and
"synched" to the diesel grid?

Batteries are indeed an option - the project is a resort that has been 100%
diesel for years.

For a brighter energy future,

Geoff Greenfield
President
Third Sun Solar & Wind Power Ltd.
340 West State street, Unit 25
Athens, Ohio 45701
(740) 597-3111   fax: (740)597-1548
www.third-sun.com

Clean Energy - Expertly Installed
------------------------------

Date: Mon, 9 Apr 2007 22:36:21 GMT
From: "Jeff Oldham" <starpower4u at juno.com>
Subject: Re: Grid tie with Diesels? [RE-wrenches]




The rule of thumb on this one is 30% PV/inverter power to genset rating. If
your two 70kW are in sync then you have 140kW x .3 = 42kW of PV. I feel a
better bet is to go w/batteries/inverter and keep the genny's at an ideal
load of 75-80% then shut down as soon as batt's are full and transfer. In an
economic review you will find that batteries are much cheaper than diesel
fuel alone. Diesel fuel costs alone are going to be around $0.27/kWh
(depending on delivery costs) and a good battery like the HUP is going to
run you about $0.09/kWh (depending on delivery costs!) or about 1/3 per kWh
(the inverter cost is barely $0.02/kWh). The main issue I see with the
PV/genny parallel is the likelihood of PV impact transparency. With just a
30% load reduction from a diesel genset that is likely not optimally loaded
already will only further lower the load and increase genny maintenance and
lower fuel/kWh efficiency. In addition your customer may have a hard time
seeing a dramatic fuel cost reduction while shorting the top-end genny
rebuild intervals. This could be over a $200k investment to get the 42kW of
PV in parallel.
Be careful and don't let this bite you in the butt!
 
-jeff o


>From the Solar, Wind and Hydro powered office of Jeff Oldham/Regenerative
SOLutions 



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