2. CONTENTS
Introduction
What is Net metering?
Why Net metering is required?
Structure of Net metering system
Net meter- Bi directional meter
Benefits of Net metering
Limitations
Net metering in India-AP
Future scope
Conclusion
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3. Demand for electricity is growing day by day
Power generation is not up to the mark
Deficit about 6-8% in India
Need for developing alternatives to reduce power
deficit
Power generation through rooftop solar is
considered as the best alternative
Solar has some drawbacks
Net metering is the solution for those drawbacks
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4. Why net metering is required?
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Fig.1
Solar power is not continuous
Expensive batteries are needed
Backup generators are required
Cannot be transported to long distances
5. What is Net metering?
Net metering is a billing mechanism that credits
solar energy system owners for the electricity they
add to the grid.
fig.2 5
10. inverter
Converts generated DC Power into AC
Power
Shall be equipped with a synchronization
device
Shall not inject Harmonic Currents & DC
Currents, introduce flicker greater than the
values specified in IEEE-519 Standard
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Fig.5
11. Isolators/ Disconnecting switches
Protective Devices
Protective Devices with Isolation
switch required between Solar
Panels & Junction Box
Automatic relay with
disconnection device after Grid
meter towards Load
Manual Operating Switch
between inverter and Solar
energy meter
Bird spike shall be provided
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Fig.6
12. Net meter- a bidirectional meter
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Fig.7
Allows two way transfer of power
Rotates in both directions
Records net power consumed
13. Technical characteristics of the meter
1. Enclosure: engineering plastic
2. Display: backlit LED display large digit size
10mm by 5mm
3. Protection index: IP51
4. System: ac 3ph 4 wire
5. Inputs: starting currents:0.2%of Ib
rated voltage: 3×240 volts
current rating:10-60 amperes
frequency 50hz±5hz
6. power factor: zero lag-unity-zero lead
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14. Benefits of net metering
Financial Credit for Extra Solar Power Produced
No Battery Storage System Needed
No Backup Generator for when Solar Power is Not
Available
Reduces electricity lost over wires
Pressure on the grid is reduced
Environment pollution can be reduced
Awareness on power consumption will be increased
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15. limitations
It has very less drawbacks
Requires installation of additional equipment
Additional precautions to be taken in operation and
maintenance of system
Cost of net metering equipment is to be bared by the
consumers themselves
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16. Net metering in India
Started in 2009
MNRE is undertaking this. Govt. is facilitating 30% of the
total money as subsidy needed for equipping net
metering system
For generating 1MW of electricity through net metering
it costs about 7-8 crores in India. After installation plant
gains about 1.6 crores per annum for 25 years
Kerala, Andhra Pradesh, Maharashtra are also well
implementing this
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17. Net metering in Andhra Pradesh
Started net metering in 2013
APCPDCL started net metering in September 2013. it
permits consumers with 3 ph supply to equip net
metering
Under APCPDCL Satyasai deemed university has been
implementing the net metering successfully in
Ananthapur dist.
APEPDCL and APSPDCL have also started net metering in
November 2013
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18. Future scope
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Indian govt. has decided to equip all the govt.
offices, hospitals, institutions, jails with rooftop PV
systems and to involve them in net metering.
19. As the power produced by solar energy using PV
systems is difficult and costly to store, this net metering
provides opportunity to supply the excess power
produced to grid and when solar power is not sufficient
or unavailable, power can be drawn from grid, thus
creating an opportunity of two way supply and making
solar energy more reliable.
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20. References
http://www. indianenvironmental.com/net_metering.pdf
http://www.howtousesolar.com/uses_netmetering/
http://www.efficientenergy.com
Net metering is a boon to utilities and local consumers
http://www.efficientcarbon.com/rooftop_solar_and_netmeteri
ng/
www.sunlightelectric.com
Rooftop Solar Systems Basic Installations and Role &
Responsibility of Field Staff –a report by ch.chakrapani
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