EDSGN 100 SECTION 18 PROF. ANDY LAU(JS) 2

DECEMBER 9 , 2010

No Grid Telecom Base Station Energy Storage System

GE Transportation

NAKURU

Problem Statement

We are undertaking the GE project of building a reliable cell phone base station in a Third World Country with an unreliable or nonexistent energy grid. We are attempting to build a reliable and cost efficient cell phone base station capable of carrying a constant 1.2+ kW load using a sustainable green energy source, diesel generator, and a sodium metal halide battery so that we can provide people in the area with reliable cell phone service.

Research

Wind Power7-10 mph just to get

them going 10 kW might not be

generated until 25-30 mph.

From 1990-1997 in Nakuru: Average Wind Speed=

1.76 m/s or 3.93 mph Mode Wind Speed= 0 mph

HydropowerPumped StorageLake Nakuru is

relatively close to the city but…o Max. depth=2.8

meterso 495 species of birds,

along with other wildlife

Research

Charge Controller

Charge ControllerRated power: 2

kWRated Battery

Voltage: 48 VMax PV Input

Power: 1700 WGE Durathon Sodium-Halide

Battery Type A2 Ambient Temp: -40 ~ 65m ºC 7.5 hours to fully recharge Max heater power: 1700 W Dimensions: 320 x 530 x 870

mm Lasts around 15 years

Research

Base Transceiver StationEntirely solar poweredDoes not need grid

power /diesel generators

No air conditioningNeeds 230 W to runSmaller PV array while

chargingMeets same

requirements as other systems

Analysis

1. More shade = less output

0 0.25 0.5 0.75 10

20406080

Shading Influence

Amount of panel shaded

PV C

urre

nt

(mill

iam

ps)

2. Angle isn’t as influential as shading, but still makes difference

0 15 30 45 60 75 900

20406080

Angle Influence

Angle of panel relative to ground

PV C

urre

nt

(mill

iam

ps)

Photovoltaic Experiment

Analysis

Charge Controlle

r

PV Syste

m 1.7 kW

BTSconstant

230 W

Dump Energy

1.2 kWh per day

GE battery

.97 η .92 η

Analysis

Analysis

Economictotal cost of system≈ $35,000476 charges per day (with available dump

loads)According to our calculations…we will make

$34,748 US dollars per year charging 20¢

Final Concept

Final Concept

Final Concept

Final Concept

Conclusion

If you take away anything from our project, you should understand…

1. 100% solar energy1. no diesel

1. BTS ≈ 1/5 original2. “phototropism”3. Dump loadcharger4. pay for itself ≈1 year