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You have cottage or county-house, but it is not possible to connect it to the central grid? Or the connection price is very high?

In this case it would be very good to compare these 2 power supply options - connecting to the grid and autonomous power supply. We have compared this 2 cases, and received the following results - if your power needs doesn't exceed several kW, and to connect to the grid you have to extend power line for several hundreds meters, in this case autonomous power supply is more economically sound than connection to the central grid.

You have to consider the following:

• in the case with central power supply you will have to pay connection fee, line extension fee (depends on you region and can be in range from 10 to 17 thousand USD per 1 kilometer). You also will pay for the electricity consumed. Better case is if there are several potential consumers - for example, several cottages - and you can share the connection and line extension cost. Otherwise, be ready to pay a lot of money...
• other option is installation of your own power supply system. Advantages are - you don't have to pay connection and line extension fees, you are independent from the price of electricity sold by your local supply company. You are the owned of the power equipment and can generate energy whenever you want. Disadvantages are - you will have to make technical maintenance and repair of your power equipment. This is especially important if you have diesel or other fossil fuel generator set as main or reserve power source. You also will have to pay attention to your storage batteries condition. Wind turbines and solar collectors also need some maintenance. Photovoltaic system needs minimum attention.

What should include the autonomous power supply system? Usually, it consists of:

1. Power source. There can be one or several power sources. The power source can be:
   • diesel, gas or petroleum electric generator
   • photovoltaic solar modules
   • wind turbine
   • small or micro hydro power generator.
   Any of these power sources can be main power supply. The others can be supplemental or reserve power sources.
2. Storage battery (SB). If you use renewable energy, this is must have component due to stochastic nature of the renewable energy source. Even if your primary source of energy is fuel genset, the presence of storage battery in the system will allow you to considerably lower the genset "on" time, but to have electrical energy 24 hours a day.
3. Inverter, which convert DC to AC. It is necessary if you have AC load, or if you DC load is far from you storage batteries (power losses in the low voltage DC cables can be very high).
4. Charge controller. This component will protect your SB from deep discharge and overcharge. Sometimes it is built-in to the inverter.
5. Load. In stand-alone power supply system you must use energy efficient load. For example, if you use incandescent lamps, they will consume 4 time more energy than fluorescent lamps with same luminous flux. Though the energy efficient load and devices are more expensive, you will save more money because you will have to generate less (expensive) energy. Also the capacity of your generator and storage battery can be lower in this case (more savings).

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