More info on LADWP's systems [RE-wrenches]

[Christopher Freitas --- OutBack Power]

I did some searching on the 'net and found the necessary information to 
understand their performance expectations.  

This is taken from a LADWP's site at:

     http://www.ladwp.com/ladwp/cms/ladwp004165.jsp 

There also are some good photos of the mounting structures and module 
tilt angles - the structures are about the most expensive module 
mounting system I could ever imagine (each module is on its own 
individual welded support which is then tied into another support beam. 
Gee - you think that could be some of the reason they paid so much??? On 
two of the systems the modules are extremely low tilt - and on another 
the structure itself shades the PV modules during much of the day...  

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Projects completed to date

LA Convention Center

LADWP constructed a 400kW solar photovoltaic system at the LA Convention 
Center. Phase 1 of the project is a 150kW system on the South Hall 
Canopy.

Cherry Street Parking Garage

Phase 2 of the LA Convention Center is a 250kW car shade on the roof of 
the Cherry Street Parking Garage. The system produces 800,000kWh of 
electricity per year, or enough electricity to power over 100 homes.

LADWP John Ferraro Office Building Vehicle Shade

The 150kW system located at the LADWP downtown General Office Building 
is a multipurpose structure: it generates electricity, provides shade 
for cars and houses the electric LAX shuttle van quick-charger. The 
system produces 275,000kWh per year, which is enough electricity to 
power over 30 homes.

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So the 250kW rated system is expected to produce 800 megawatt-hours of 
power per year.  Let's see what that means:

800 MWH per year / 365 days = 2.19 MWH per day = 2,190 kWH per day

2190 kWH per day / 250 kW system = 8.76 peak sun hours per day - every 
day! no clouds allowed!  


The 150 kW system is expected to produce 275 megawatt-hours - so:

275 MWH per year / 365 days = 750 KWH per day

750 kWH per day / 150 kW system = 5 peak sun hours per day... every day! 
no clouds allowed!  

BTW - they are assuming a house has about 900 watts of continuous load - 
resulting in annual consumption of 8 megawatts per house.  

Christopher Freitas
OutBack Power Systems, Inc.
cfreitas @ outbackpower.com  
www.outbackpower.com
Arlington WA USA
Tel 360 435 6030  

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