Combining Grid power and solar power at The Alternative Energy Store

Combining Grid power and solar power

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Posted by Tech Guy on June 30, 2009, 02:48:28 AM

Hi,

I want to install a solar PV system along with grid power such that when there is a deficit of solar energy, I has to take "REMAINING" from the grid.

Can anyone clearly say whether it is possible or not.

« Last Edit: June 30, 2009, 02:50:35 AM by Tech Guy »

Posted by on June 30, 2009, 09:56:30 AM

Re: Combining Grid power and solar power (Reply #1)

Normally a typical grid tied (utility interactive) system goes both ways but it does what you want. If there is enough sun to cover your load than you don't buy any utility power. If you have more sun than your current load, it sends power to the utility which typically gives you a credit for the extra power you are producing. If there is not enough sun to cover your load, than the utility supplies you the difference.

Of course anytime that you hook power generating equipment to the utility, you need an agreement with the utility and the equipment needs to be installed to the National Electrical Code (NEC)and the interconnecting inverter will have to meet certain standards.

Posted by James Cormican on June 30, 2009, 09:58:52 AM

Re: Combining Grid power and solar power (Reply #2)

without batteries, a grid tie system will not run if the grid is down, it is important to point out. grid tie systems are very strictly regulated, and must adhere to the national electric code, be inspected, and have the appropriate interconnection agreement with the utility in question.

james
altE staff

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Posted by Tech Guy on July 01, 2009, 02:16:22 AM

Re: Combining Grid power and solar power (Reply #3)

What is the device that supplies the difference power from the grid

Posted by James Cormican on July 01, 2009, 09:19:03 AM

Re: Combining Grid power and solar power (Reply #4)

i dont understand your question, but this may help.

grid supplies main panel, when sunny inverter also supplies main panel reducing demand for electricity from grid.

if more electricity is coming from inverter than main panel demands at any instant, the excess is sold back to the electric company.

if 10 minutes after that instant, the loads get to be larger than what the inverter is putting out, the grid was always there and is supplying the difference.

the grid tie system generally offsets what is pulled from the grid when weather conditions allow.

hope that helps,

james
altE staff

AltE
"Making Renewable Do-able"
http://www.altEstore.com/

Tel: 877.878.4060 x107 or +1.978.562.5858 x107
Fax: 877.242.6718 or +1.978.562.5854

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