Geoff Calder

Advisor to the Ministry of Education and Vocational Training

Case studies on the use of alternative energy with ICT

Kasulu Folk Development College 1999 Kasulu Teachers College 2001 Mtabila Refugee Camp 2001 Ndala Teachers College 2007 Tandala Teachers College 2007 Kasulu Teachers College 2007 Kabanga Teachers College 2007

Case Studies

Kasulu Folk Development College 1999

Diesel generator powering computer class

4 Litres of diesel per hour

Regular break downs

Spikes and surges damaged computers

Often no fuel or battery

Kasulu Teachers College 2001

Kasulu Teachers College 2001

Biogas supplementing diesel generator

Mtabila Refugee Camp 2001

Solar system for Internet Centre

Mtabila Refugee Camp

Loading

Equipment Qty Watts Hrs per day Total watt hrs

Computers 10 150 10 15000

Printer 1 60 10 600

Lights 10 10 10 1000

Switch 1 60 10 600

Router 1 10 10 600

Total 17800

Description Qty Cost Total Cost USD

Solar panels (75w)

48 354,000 16,992,000

Batteries (2volt-1300 amp/hours)

24 340,000 8,160,000

Trace 48 volt inverter

1 4,000,000

Solar panel construction

6,000,000

Electrical installation

2,000,000

Total 37,152,000

Specifications and cost

Thin Client Computers

Thin client computers

Tandala Teachers College 2007

Ndala Teachers College Ndala Teachers College 2007

Solar system for thin client computer network

Thin client network

Thin Client prototypes

Comparison

Desk Top Thin Client

Energy 120 Watts 40 watts

Voltage 240v AC 12v DC

UPS Required None required

Noise Fans None

Heat Very little

Solar panels

Solar charger control 120 A

Generator

Charger / Inverter

Batteries

Load controller

12 v lighting

12v DC

Thin clients

240v AC

Ndala - Tandala

ModemRouter SwitchesServers

Internet

Description Qty Watts Hrs /day Total watt hrs

Printer 1 70 6 420

Lights 10 18 2 360

Switch 1 60 6 360

Router 1 10 6 360

Server 1 100 6 600

Projector 2 672

Total 2772

Ndala Teachers College AC circuit

Equipment Qty Watts Hrs/day

Total watt hrs

Thin client computers 20 40 6 4800

Scanner 1 15 1 15

Total 4815

Ndala Teachers College DC circuit

Total Watt/Hrs 2772 + 4815 = 7587 W/h for 6 hours per day

Qty Cost Total Cost USD

Solar panels (125w) 16 890,000 14,240,000

Batteries (12v - 210 amp/hours)

12 390,000 4,680,000

Inverter/Charger 1 1,600 1,600,000

Charge controllers 4 400,000 1,600,000

Electrical installation

7,000,000

Total 29,120,000

Kasulu Teachers College October 2007

Solar system moved from Mtabila

Solar panels

Solar charger control

Kabanga hydro 75KW

Charger / Inverter

Batteries

240v lighting

Thin clients 240v AC

Kabanga Teacher College 2007

ModemRouter SwitchesServers

240v AC

12v DC

Solar panels

Solar charger control 120 A

Batteries

Load controller

12 v lighting

12v DC

Thin clients

Total 12v circuit

Servers

Internet

Data

Thank you

geoff@caldertowers.com