2) Headends and Hubs

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2) Headends and Hubs


Photovoltaic Power System for DC loadsExtra High Efficiency

Photovoltaic Power System “PVPS”

• PVPS is a solar/power bay system that supplies DC power directly to the battery bank and DC load.

• Grid-tied, but continues to provide power in the event of an outage.•Fully integrated.•Ready for rapid deployment.

• Ideal for critical loads


Hybrid Power Systems - “HPS”

PV Array

Wind Turbine(s)

Alpha GroupDC Power Plant:Charge Controller, Cordex (Rectifier

and Inverter optional)

Battery Bank

Customer AC Loads

Customer DC Loads

Generator(s)

Hybrid Power System “HPS”

• For maximum power reliability, incorporates:

• Solar• Battery• And/or generator• And/or wind turbine

• Designed for larger loads providing DC and/or AC output

• Custom Engineering


Case Study: Leading European MSO

• Purchased over 300kw of PV power from Alpha– 80% went into Office installations

• Corporate and Sales

– 18% went into Headend and Hub site locations but using AC grid tie power to take advantage of high European feed in tariffs

– 2% Experimented with low load network powering locations. Was very hard to impossible to find locations to make this happen


3) Network


Applying solar down in the network

• To go fully off grid:– Pricey: $18,000+ to go full off grid and not connect to

the utility, Difficult to find enough space, rights of way– Vulnerable to theft– Lots of batteries

• Can be used to defer power costs– Can start to shed load for 1500$ on up– Projects in europe with one or four panels and a small

charge controller• Panel installation permissions were the biggest issue• Can have a decent payback


Hybrid CableUPS in a Fibernode Power Enclosure (FPE)

Nodes


Utility Savings of Alpha Hybrid Cable UPS

0%

20%

40%

60%

80%

100%

120%

140%

Traditional HFC Fiber Deep, N+1 Fiber Deep, N+0

Network Structure

Perc

en

t S

avin

gs

PV Cost Savings % Peak Shaving Savings % Total Cost Savings %


Alpha Hybrid Cable UPS

10.7

0.7

13.2

0.9

15.0

1.0

0

2

4

6

8

10

12

14

16

Payback Payback with 30% rebate

Ye

ars

Traditional HFC Fiber Deep, N+1 Fiber Deep, N+0


Case Study: Remote Cell or Microwave sites: Sierra Vista, AZ Cell Repeater• The Choices:

– High Capital Cost• Contract with the utility to

install distribution

– High O&M Cost• LP Generator with regular

maintenance

– Best Life Cycle Cost• Solar power system with

generator backup

• Alpha’s HPS arrives at the site fully tested and ready for deployment.


Case Study: Low power transmission sites: Cisco Wireless Mobility

Alpha Technologies

Model number MPS30-48CSL is a 48VDC Uninterruptible Power Supply

Supporting

Cisco Aironet 1500 radios for

Outdoor Mesh Networks


Payback Analyses for a Photovoltaic Power System in the Caribbean


System Description

0.0

500.0

1000.0

1500.0

2000.0

2500.0

3000.0

3500.0

4000.0

4500.0

5000.0

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Pro

du

cti

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kW

h

Solar System Electricity ProductionEstimated at ~50,000 kWhs Annually

• $100,000 USD Estimated Upfront Cost for a 26.0 kW Alpha PVPS• Roof-Mount Racking; PV Array Tilted at a 10° Angle due South• Produces ~50,000 kWhs annually• Installation, taxes, and shipping charges not included in estimated cost


Exception and Clarifications on Study

Weather data used in analysis was from Aruba. Used various electricity rates in $0.10 increments, with an annual 4.0% cost /kWh

escalation . Assumed system would be installed at the beginning of the year. Output degradation from the modules was estimated to be 0.5% annually. NPV was calculated with a 7.0% discount rate over 20 years. IRR was calculated over 20 years. Following graphs show simple payback (revenue and costs per year) pre-taxed.

Does not take inflation into account. No costs due to taxes, shipping, installation or maintenance were included in

analysis.


Payback Models with Varying Electricity Rates

$(150,000)

$(100,000)

$(50,000)

$-

$50,000

$100,000

$150,000

$200,000

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

26.0 kW PVPS Cumulative Revenue / Investment When Electricity is $0.20 / kWh

$(150,000)

$(100,000)

$(50,000)

$-

$50,000

$100,000

$150,000

$200,000

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$300,000

$350,000

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20


$(200,000)

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$-

$100,000

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0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20


$(200,000)

$(100,000)

$-

$100,000

$200,000

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$700,000

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

26.0 kW PVPS Cumulative Revenue / Investment When Electricity is $0..50 / kWh


Thank you for your time.

2) Headends and Hubs

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