Parameters

Estimated Values

References/Notes

Negative Charge

-700 volts

[2]

Grain size of lunar regolith

~50 µm

[22]

Triboelctric Charge

~10⁵ electrons

[22]

Solar-Electron Charge

~10⁷ electrons

~1.602 × 10¹² Coulomb

[23] by exposure from solar plasma

Charge Accumulated

~10⁷ electrons

On each regolith particle (assumed)

Size of Collector Blades

5 cm × 30 cm × ea

Design Value for a blade

Charge Transfer Area

300 cm²

Both sides of a single blade

Area for 10 blades

3000 cm²

Blade area contacted by charges

Collector Base Area

10 cm × 30 cm

Base area where 10 blades attached

Collector Blades + Base

3300 cm²

Contacting area by charges

#Of Contacting Soil Particles

132  × 10⁶

[3300 cm₂/(50 µm)²]

Total charge captured by Blade

132 × 10¹³

(132 × 10⁶) × 10⁷ electrons

Driving Speed of Collector

30 cm/sec

Refresh rate; speed of rover

Charge collection Rate/unit

0.00021 Coulomb/sec

0.21 mA/units

#Of Unit per Bus Array

10

Each bus has 10 units

#Of Buses

4

Rover carries 4 buses

Total Collection Rate

8.4 cm/sec

8.4 mA

Power Harvested

5.88 Watts

(= 8.4 mA × 700 V) at 700 V potential