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So you've been thinking about solar electric, but have a few questions... In this issue of The Green Scene, we have collected a list of commonly asked questions to help you in your decision.
What is PV and how does it work?
PV stands for Photovoltaic. A solar cell is made of silicon, one of the most abundant elements on Earth. Computer chips are made of this same material.
A solar cell converts light to electricity. Basically, when light strikes the surface of a solar cell some of it is absorbed into the silicon. This light energy bumps the electrons loose and causes energy to flow.
By packaging approximately 36 solar cells together a solar panel or a solar module is created. When you have more then one solar panel you create a solar array.
How long will solar panels last?
Our manufacturers warranty their solar panels for 20-25 years (40 year life is not uncommon).
What system type do I need?
Depending on your needs, you can choose a stand-alone system, grid-connected system or the grid-connected system with backup capability.
A stand-alone photovoltaic system is entirely self-contained and normally includes batteries and a generator. This system is ideal for the person who lives more than an eighth of a mile from the power pole.
A grid-connected system (also know as net metering) is directly connected with the utility grid and allows the power produced by solar system to offset the amount of power purchased from the utility company.
A grid-connected system with battery and /or generator backup insures uninterrupted power if the weather is not cooperating or there is a utility power outage.
How much does a system cost?
There are too many variables to give a simple answer. System type, size and cost are directly related to the number of appliances used and the length of time they are used. The most cost-effective first step is to make an energy assessment of your appliances and replace them with newer energy-efficient ones. It is also recommended that you switch to compact fluorescent light bulbs (CFL) or LED. The more energy you conserve, the less expensive your system will be.
Can I start small and add on later?
Yes. If you start with some good basic components, it is easy to add to your system later. The eventual size of your system will be determined by the size and type of the inverter. With the help of a system designer, you can plan your purchases to reach your ultimate goal.
Do I have to have the solar panels on my roof?
No. Panels can be mounted on a south-facing roof, but many people choose a ground-mount or a tracker. Trackers can be adjusted manually or automatically.
What are inverters, and what do they do?
An inverter changes DC power that is stored in your batteries into standard alternating current (AC). The true sine wave inverter produces cleaner energy than that which is provided by the local utility company.
Will the system work on gray, cloudy or overcast days?
Yes — because photovoltaic energy ("PV" or "solar power") uses the full spectrum of light, the ultraviolet rays are still charging the system, though at a reduced rate, even when the sunlight isn’t visible.
How can solar power work at night?
At night, a PV solar system draws on the power that was generated during the day and stored in the battery bank.
Can I sell power back to the utility grid?
No. In reality you trade Kw for Kw with the power company. NV Energy has a Net Metering Program in which a special meter is installed to keep track of the power generated by the PV system, as well as the power used by the home. Periodically, those amounts will be "netted" out and the homeowners will pay only for the net amount of power they used during that period. We customize your system to reflect your family’s usage to balance the tradeoff between your electric bill and your PV system.
This system can be set up with or without backup capabilities. With batteries and an upgraded inverter, your home can have power even when the utility is down.
If you have questions about solar electric that you don't see answered here, please feel free to contact us any time. We are here to help you make the right decision for your energy needs.
Contact us today for your
FREE Solar Evaluation!
775-884-3140 or info@solarsolutionsunltd.com |
