California Solar Engineering
Home Site Map Contact Us Login
Solar Energy Systems for Home and Business
Company Key Competencies Products & Services Design Your System Our Customers FAQ's Glossary


Home

Practical PV Systems

Grid-tie Systems
Back-up Systems
Off-grid Systems
Tracking Systems
Sizing a PV System
Utility Bill Savings, ROI
ROI and Payback
Clean Power Estimator
Utility Companies


A Short Course on PV:


How do PV Cells Work?
The PV Cell
What Does a PV Mod. Look Like?
Other PV Cell Materials
The Sun as an Energy Source
Path of the Sun through the Sky
The PV System Hierarchy


Solar Energy Resources

LA-DWP Green LA
California Energy Commission
Florida Solar Energy Center
California Solar Center
US Green Building Council
National Center for Photovoltaics
Home Power magazine
Solar Today magazine


Our Customers


Angelo and Mary Valente
Woodland Hills, CA
LADWP 3.1 kW-STC

The Valentes were on a Time of Use rate, and chose to purchase a PV system which produced less than their daily energy usage. However, it performed well as a "peak shaving" system, whereby their most expensive electricity in the LADWP area-weekdays Noon to 5 pm-was largely eliminated.

We used 22 Shell Solar SP-140 modules and a SMA America Sunny Boy 2500 inverter with display. About half of the PV modules were placed on a 4:12 south-facing roof while the remainder had to be placed on 4:12 west- and east-facing roofs with tilt legs.

The Valentes also wanted to be able to swim in their pool a full seven months of the year. Shown at the left is a portion of the solar hot water system with 280 sq. ft. of collector area. The pool also had a removable cover. The system is fully automatic, so that the solar collectors have circulating water only when the Sun shines. There is a high temperature cutoff and the collectors drain back into the pool when the pump is not running.