|
 |
|
 |
|
|
|
|
Information on Solar Electric power
|
Abbreviations
Basics of the solar cell
Back-up Battery Systems
Electric Utility Rates
Grid-connection Implications
Installation Basics
Locations for panels
Rebates & Tax Credits
Roofs
(photo-journal of roof work on a tile customer)
Self-Installation
(steps for a self-installation)
Time of Use Metering
Why should I do it?
|
Abbreviations (Frequently used)
|
kw: Kilowatts of rated capacity, actual production is up to 85% of the kw rating.
kwh: Kilowatt-hours, typical usage is 15 kwh per day.
NM: "Net-Metering" Net-metering allows customers to over-generate during peak sun hours for credits and consume those credits during periods of under-generation.
TOU: "Time of Use" metering. TOU customers receive more credit for power generated in the peak period during the day. TOU allows much smaller systems to zero out electric bills.
SCE: Southern California Edison. SCE allows TOU billing.
LADWP: Los Angeles Dept. of Water and Power. LADWP does not allow TOU.
AMU: Anaheim municipal electric utility does not allow TOU.
[Back to top]
|
| Basics of the solar cell Solar electric cells convert light from the sun into usable D.C. electricity. Solar Electric systems involve light weight-panels, enclosed wires, an inverter to convert from D.C. to A.C. house current, and optional battery backup pack. Solar Electric panels are much lighter than solar water heater panels. Solar electric panels are guaranteed by the manufacturer for at least 20 years.
|

Solar Cell
|
[Back to top]
|
| |
| Back-up Battery Systems |

Battery
|
A no-flicker, always-on backup battery is available for any circuit in your house. Most small systems are only 120v, and only back up 4 or 5 circuits for emergency service. Larger systems can be installed with a 240v inverter, and go completely off grid even for 220v appliances. Typically, for battery systems, the AC side of the inverter is connected to the main panel, and the "always on" circuits are relocated to a new sub-panel. Batteries have a lifespan, and add cost, but with a battery pack, the solar array will power you even in periods of grid outages (such as rolling blackouts).
Going "off grid" takes enough storage batteries to get you through the night and other periods of little sun. However, you don't get the benefit of rebates unless the system is connected to the grid. Using the grid to store your excess production is very handy, so staying connected is highly recommended, even if you opt for your own battery backup.
|
[Back to top]
|
|
|
| Electric Utility Rates Our society's electric usage has peaks and valleys of demand.
- High peak periods are in the daytime.
- Low, or "off-peak" periods are usually after the sun has set.
|
|
|
Solar power is a perfect complement to this pattern, since it produces power in the daytime -- when it is most needed. Solar power producers are valuable to the electric companies, because we even out the demand curve. Electric vehicle owners can especially benefit from this, since they charge their electric vehicles batteries off-peak at night, further flattening the electricity demand curve.
|
Thanks to California's small energy generator law, you can feed the output of the solar array directly into the grid (using the grid as storage) during the day and then draw it back from the grid during night-time. "Net metering" means that you will only be charged for the deficit, if any. This is great for the grid, because you are generating electricity when the grid needs it -- during the day -- and drawing from the grid at night (mostly off-peak).
|
[Back to top]
|
| |
| Grid-connection Implications Grid-connection makes you a partner with the electric provider. Power from your system, in the daytime, might power 3, 5 or even more houses on your block, lowering the need for expensive and environmentally harmful "peak power" generators. In addition to a standard building permit, the electricity company must issue you a "net metering" contract with your own number. Further, they are allowed to inspect your equipment to ensure that it's up to code, and to make sure the meter can record your production as well as your consumption.
[Back to top]
|
| Installation Basics Solar cells are built into panels, the panels are mounted on racks. Racks must be strong enough to withstand wind, and bolts holding them down must be sunk into roof joists, then sealed with silicone sealer. Tile roof requires removal and re-insallation of the tiles.
Flexible metal conduit is sealed from the elements and collected at a sub-panel or fused collector box. The powerful DC current is combined and carried by heavy duty wire in solid conduit to the Inverter. The (optional) battery pack is connected to the DC side of the inverter. The inverter changes the current to familiar AC, and hooks up to the electric meter.
[Back to top]
|
| |
| Locations for Panels Roof orientation is important. Panel efficiency is related to the angle to the sun. South-facing sloping roofs (in the northern hemisphere) are the easiest, but a system can be configured for almost any roof. California law does not allow banning solar rooftop systems based on appearance considerations or Association rules or covenants. Also, if a neighbor's trees block your panels, the law does require their owner to trim them.
Besides rooftop installations, you may also opt for groundmount installations. The panels may either be oriented south-facing by the use of racks or a naturally south-facing hill. Since groundmount installations are closer to the ground, they are often more vulnerable to shading from nearby tall objects, so it is usually best to place groundmount installations in a cleared area.
[Back to top]
|
| |
| Rebates & Tax Credits ...YES! The CEC, City of Los Angeles Dept. of Water and Power, Anaheim, and other agencies, provide substantial "buydown" assistance (up to HALF the cost of the solar panels!). This dramatically lowers the cost of the systems supplied by EESolar. We handle all this cost-cutting paperwork for our customers: system documentation, 5 year warranty, receipts and so on.
[Back to top]
|
| |
| Roofs For your solar system installation, you will require expertise in roofing to make sure that no leaks occur during the rainy season. Different types of roofs require different treatment and installation techniques. The simplest, ideal roof for installation is composite shingle. Rails and solar racks may be mounted on top of composite shingle without removal. Similarly, a flat gravel roof does not require much re-roofing work for installation. Concrete, metal, and clay tile roofs, on the other hand, present a greater challenge -- they require removal and replacement. Since they are delicate and extend significantly above the roof, the tiles need to be temporarily removed so that the rails can be mounted firmly. After the installation of the rails, the tiles may be placed back on the roof. Click here for a detailed photo-description of how tiles may be done.
[Back to top]
|
| |
| Self-Installation Steps Yes, you can do almost all the work yourself. The difficult rewiring and new wiring must be done at least under the supervision of a licensed electrician. EESolar
provides assistance and advice if you wish to do it yourself. Contact the
office for details and costs. You can start by looking over the
chronology of tasks, thanks to SCE's Net
Metering Dept, and the pricing guidelines for panels and other supplies. Consult the CEC and/or SCE for the latest required documentation.
[Back to top]
|
| |
| Time of Use metering The "hills and valleys" of electric demand are reflected in the TOU rate schedule. While normal domestic service does not charge depending on the time, the TOU rate schedule, when available, charges (and, for solar owners, pays) depending on the time. If you opt for TOU, and if it is available in your area, you can sell electricity during the day at a higher rate but your usage (at night) would be charged at a much lower rate. This leverage allows even small systems to lower or even eliminate the electric bill (excluding the $5 monthly cost of the meter).
[Back to top]
|
| |
| Why should I do it? Plainly put, it saves you money! The solar energy that you generate will not just be available during the day, but also during the night, cutting your monthly electricity bill by more than 50% (often up to 100%!). Because solar panels are heavily subsidized by various sources, this investment will eventually completely pay for itself and then more ... forever!
Thousands are now living with their own clean rooftop power systems, contributing to the grid during peak demand and lessening our dependence on fossil fuel supplies, as well as reducing the environmental costs associated with energy production. Power grid operators and government regulators alike recognize the mutual benefits of solar power generation during peak daylight hours -- when it's most needed, and generated where it's needed, lessening power tranmission costs and losses.
In the long run, you're saving yourself a significant amount of money, AND you're helping out the environment. What can beat that?
Graph Depicting Cumulative Value of Solar Panels Over Time
|
Our analysis shows that a typical solar panel installation will literally pay for itself over a period of about ten years, and how after three decades, you would have saved enough money to buy TWO decent midsized cars!
Visit our signup form or
contact a sales representative to find out more. |
[Back to top]
|
| |
|
|
 |
|
 |
|
|