For the necessities of radio-net of hydrometeorological service, a few tens of solar cell systems has been installed in Serbia for past fifteen years in order to supply repeaters at hardly accessible locations (mountain peaks, etc.) with solar power. It has been shown that PV systems used for these purposes are more profitable than previously used diesel aggregates. The advantages of solar cells were particularly obvious during NATO air-raids of Serbia (spring 1999.), when destroyed repeaters at more accessible locations were promptly replaced by stand-by devices with PV supply, so that power failure lasted only as one aircraft-attack. [8]

Extremely rapid development of mobile telephony utilization in past few years, promises creation of wide market for application of solar cells. According to statement of domestic officials, new providers shall refresh competition, improve quality and lower the price of services. Expansion of net of repeater points, many of which will be supplied by PV power, represents an integral part of the process.

Therefore, anticipated dynamics of future application of solar cells in the field of telecommunications is most impressive in comparison with so-far specified applications. (Table 5.).

After rapid increase of application in 2007. and 2008., annual newly installed power rating of solar cells for telecommunication transmitters will be stabilized at the level of about 0,5 MW.

2. Charging of electric vehicle batteries

To deserve the epithet of ecology-friendly vehicles, electric vehicles should charge their accu-batteries with power produced by solar cells.

For small electric vehicles (wheelchairs, bycycles and motor-scoters) solar chargers of 160 W are sufficient. During summer season, these solar chargers provide about 135 kWh of electric power making possible for motor scooter to cover a distance of about 8,500 km.

For larger electric vehicles (small cars with 2-4 seats) solar chargers of 1.6 kW are necessary. With an average annual production of 1.350 kWh, small electric cars may cover a distance of 13,500 km. [9]

In an estimate of dynamics of development of application of solar battery chargers, one should start from relatively high final price of oil derivatives at the domestic market. However, after opening of Yugoslavia to the world, and cancellation of exterior wall of economic sanctions, one can observe mild decrease of these prices and improved supply due to increased competitiveness at this so-far monopolized market.

Therefore it is not expected that in first three years solar chargers for electric vehicles will be widely introduced: 12 kW in 2006, 38 kW in 2007, and 94 kW in 2008. (Table 6.).

With stabilization of the market condition in our country and intensification of ecological requirements, according to the regulations of European Union, conditions will be created for more extensive application of electric-vehicle chargers so that, according to our estimates, already in 2009 year, 214 kW would be installed, while during next (2010.) year another 230 kW would be added.