Technically, this system is called 'Grid-Tied Electrical System'. And it is used in many countries in the way you described; here is the list:
Yes, it is true that no battery banks are required for Grid-Tied systems and hence, this system really pays back. But, Grid-Tied or Grid-Interactive systems don't work in the case of power outage. And in Pakistan, there are frequent rolling blackouts. So, it is not much feasible in Pakistan. You can use Grid-Tied system along with an Off-Grid inverter (which requires battery) so that in blackouts, off-grid system becomes available but then again, off-grid system uses batteries and therefore increases running cost. Moreover, Pakistan does not allow Grid-Tied systems, so no reverse metering facility is available here from power distribution companies. :-|
Thanks and Regards,
Adnan Ashraf
Senior Design Engineer
NUST-SEECS
On Sun, May 26, 2013 at 9:40 AM, Jafar Rizvi <dr.jafar.rizvi@gmail.com> wrote:
While informal chat, Dr. Anjum Iqbal sahib gave a really good idea regarding energy solution as follows:The solar panel system can be more useful, if we use 'Reverse Metering' system:
- Govt. may help people buying solar panels on soft loans.
- Govt. may recommend/approve solar system specifications to be used.
- Distribution Companies can launch 'Reverse Metering' system. Excess energy, in the day, at end user premisis may be accepted by respective grid. When end user gets advantage of energy units this will make the project feasible. End user will try to install more and more solar panel at its premsis and end user will try to maintain it in a good state to get advantage of free energy.
- Generation Companies may generate more energy in the night and less in the day. Because more solar energy is available in the day.
- End user will not need a big battery bank for storage for night use.
Is this workable? What are your comments?
Adnan Ashraf
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