**4.4 Economic results**

The cost of inverter way is 2150 SD pounds and it can work for 25 years without any additional cost. But DC way is cheaper and cost 1700 SD pounds without any additional cost. **Table 4** shows calculated the cost of solar system.

The annual cost of the electric power grid is calculated for a period of 25 years by Sudanese pound (SDP).

The cost of electricity power =

Total power (Wh)\*0.76 SDP/kW\*365.25 day \*25 years = 833 SDP

The electricity power is the cheaper than PV system; but the solar energy can be used in rural areas where there is no electricity power and offer medical services to fulfill the project's objective.
