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Solar Inverters

07/03/2013 11:10 AM

what is the extra features to call an inverter as "solar"? do normal industrial/regular ones not work well with solar panels?

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#1

Re: Solar Inverters

07/03/2013 12:13 PM

Extra features?

It's placed outside, so the sun can hit it.

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#2

Re: Solar Inverters

07/03/2013 1:35 PM

One of the most overlooked inverter specification is the power burn when it's doing nothing. I Have a 3000 watt that burns 4amps of +12vdc with no output load.

If your using solar, you will also want to know the converter efficiency as a function of load. i.e. not just max load.

Also there are grid tie inverters, battery backup, and stand alone.

See

Wikipedia Solar_inverter

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#3

Re: Solar Inverters

07/03/2013 7:10 PM

The most common difference is that the input voltage is in the range common for battery storage systems used with solar cells (although this varies quite a lot). Also, the output is typically "mains" voltage and frequency (120 VAC @ 60 hz in the US, for example).

Many industrial inverters, on the other hand, are variable frequency, and are used to drive motors at variable speeds. They are often fed by mains voltage and frequency (which is usually converted to DC internally, then back to the desired V and freq.).

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#4

Re: Solar Inverters

07/04/2013 6:54 AM

in fact I wonder are these guys more expensive and high-end ones compared to normal inverters in a common sense?

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#5
In reply to #4

Re: Solar Inverters

07/04/2013 3:20 PM

Try looking here....

http://www.invertersrus.com

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#6

Re: Solar Inverters

07/04/2013 5:05 PM

In a basic solar system without a grid connection you will have a solar array of panels on the roof, a solar controller, a battery bank and an inverter. That is what I have at my home and my system is small with only 1kW of solar panels. My panels produce about 36VDC which comes down to an MPPT controller and gets stepped down to 13.8VDC for my battery bank. My simple inverter changes the 13.8VDC into 120VAC to power part of my house.

The simple, basic inverter changes a DC voltage from a battery bank into an AC voltage for use in the house.

When the system gets bigger things change. If you have hundreds of solar panels and you try to put it together using the above method you will need dozens of controllers and inverters to get higher powers.

So the inverter manufacturers began offering large inverters with built in solar controllers which can operate at high DC voltages from the solar array. This reduces components and when you come down from the solar array at high voltages, say around 400VDC you save costs on cabling etc. These inverters would, in my opinion, be called solar inverters while my inverter would be simply called an inverter.

This is a very simplified explanation as many variations exist. I hope this answers your question or at least opens the door to further details if you would like them.

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John

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#7

Re: Solar Inverters

07/08/2013 12:19 PM

A solar inverter should be designed to operate at the MPP (maximum power point) of the photo-voltaic panel to get the maximum power output.

However, the cynic in me suspects that a 'solar' inverter may be simply a case of marketeering to garner a larger market share.

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