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Join Date: Jun 2010
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Interactive system

06/02/2010 10:53 PM

When a solar photovoltaic system (spvc) is on line (parallel) with the main power distribution network or power producing source, how can you tell if the energy produced by the spvs is being used by the consumer, who bought the system to reduce his individual consumption and can the energy use be quantified at the consumer's home?

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Guru
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#1

Re: Interactive system

06/02/2010 11:18 PM

Does the meter have a visible wheel for checking direction of rotation, or a digital display with ± sign to distinguish the direction of power? (And write it down somewhere to remember which is which....)

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#2
In reply to #1

Re: Interactive system

06/02/2010 11:30 PM

Negative. The systems are connected on the line side of the main disconnect. To rephrase the question: How can I tell if I'm using energy from the spvs or the main power provider? Is my spvs providing power to the whole network?

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Guru
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#3
In reply to #2

Re: Interactive system

06/02/2010 11:45 PM

That puzzles me. In that scheme, what keeps the grid from burning up the SPVC at night? (Or am I just missing something?)

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#4

Re: Interactive system

06/03/2010 7:32 AM

There are devices in the system that prevents feedback from the main power grid. The main distribution breaker trips when the main power source trip out. This prevents the spvs from feeding the island and overloading the spvs.

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#5

Re: Interactive system

06/03/2010 11:55 PM

If you are using the correct type of inverter and not some home-made device it will show on the LCD how much kWHrs injected into the grid, and depending on which country you reside in, will either show on the utilities meter as a subtraction or will be read when the utility meter is read and will be detailed in your next power bill.

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#6

Re: Interactive system

06/04/2010 7:50 AM

In most grid-tie configurations the DC generated by the solar array goes into the grid tie inverter and produces grid compatible AC power. If the house load is less than the power being generated by the solar array the excess will be fed back into the grid (where permitted). Metering devices on the inverter will tell you this. Also, the metering system provided by your power company, and this can vary, will also tell you what is happening. In the afternoon as the solar array starts shutting down your grid source will gradually increase to carry your load at night. The inverter handles all the reverse feed issues at night time. Also important, a grid tie inverter shuts down if the grid fails. If you cannot tolerate this then you need a second inverter to create a mini-grid to fool the main grid tie inverter into running even when grid has failed.

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