**The general idea**

We are using power voltaic (PV) array to collect sunlight and generate energy to run the water pump. The water is stored in an elevated reservoir, and then fed to the crops by drip irrigation using gravitational force.

**Basic demonstration**

OSHNIC Solar panel.

**Sizing solar pumps:***The hydraulic energy required (kWh/day) *

= volume required (m³/day) x head (m) x [water density x gravity / (3.6 x 10^6 )]

= volume required (m³/day) x head (m) x 0.002725

*The solar array power required (kWp) *

= __Hydraulic energy required (kWh/day)__

Av. daily solar irradiation (kWh/m²/day x F x E)

where F = array mismatch factor = 0.85 on average and E = daily subsystem efficiency = 0.25 – 0.40 typically

__Relation:__

An acre of corn gives off 4000 gallon of water (~ 33000 lbs) in evaporation per day.

Imagine walking a quarter of a mile and carrying 50 lbs of water for 660 times a day to replenish the water loss!!!

**Concerns:**

- Training
- Maintenance
- Consider vertical integration
- Cultural changes
- Material sourcing (would like to keep as local as possible)
- Fencing

**Source:**

How much sun does Ghana have?

System demonstrated by Stanford team

How to calculate water volume pumped by solar power.

How much water is needed to…