Solar PCU - clarification

[Radhika Baskar]

Hi,

I understand that a Solar Power Conditioning Unit (PCU) will not be
able to support an air-conditioning load since it does not have
sufficient rating to cater to the surge current that flows whenever
the compressor starts, which can happen many times during the
operation of an A/C unit. However, Inverters offered for normal
domestic use, as a standby power source during times of mains failure,
are able to support A/C unit as widely publicised by the Inverter
Manufacturers.

I want to know what makes these domestic Inverters to be capable of
supporting A/C unit.

I look forward to your valuable explanation on this.

Thanks & Regards,

Radhika

[Manu Sharma]

On Tue, Dec 22, 2009 at 5:56 PM, Radhika Baskar <rad...@gmail.com> wrote:

Hi,

I understand that a Solar Power Conditioning Unit (PCU) will not be

able to support an air-conditioning load [..] I want to know what makes these domestic Inverters to be capable of supporting A/C unit.

Radhika,

There are essentially two main ways of running electrical equipment off solar power:

 

a) PV panels directly powering electrical appliances. Low cost but works only when the sun is out and can't take big load changes. However, it's more efficient as it avoids conversion losses.

 

b) PV panels powering appliances through energy storage such as a battery bank or using the grid for energy storage. Involves conversion loses and is significantly more expensive.

It is in case a) that A/C load cannot be supported. When you have a battery bank being powered by PV, given sufficient size, they can take on any load.

With that said, air conditioning is a huge power hog. You should perhaps explore other alternatives for cooling such as earth tunnels (suitable if you're constructing a new house) or solar-electrical hybrid air conditioning. 

Members on Green-India have expertese in both these areas so give a shout out if you want to consider those possibilities.

Thanks,

Manu     

[Radhika Baskar]

Thanks Manu for the reply.

I was always given to understand that Grid is compared to an infinite
battery bank. In a Grid-tie inverter where both Solar power and Grid
power are catering to the loads, why the surge current for an Air
conditioning load cannot be met by the Grid?

My question is when Inverters for domestic use in the market are
publicised to support A/C load why cannot a Solar Inverter do?

I look forward to inputs from Green-India's knowledge tank!

thanks,
Radhika

On Dec 22, 5:40 pm, Manu Sharma <orangeh...@gmail.com> wrote:

[Greg Watson]

Hi Radhika,

Yup. 100% correct.

When the connected grid load exceeds the solar inverters capacity to feed
back to the grid and power the local load, the excess energy demand from the
load is sourced from the grid. So the solar inverter need not be sized to
handle the startup energy demands of a A/C system.

All the best,
Green and Gold Energy Pty., Ltd
Greg Watson, CEO
7 Provident Avenue, Glynde, 5070
South Australia, Australia, +61 8 8365 5844
http://www.greenandgoldenergy.com.au

"SunCube" and "SunBall Solar Battery" are
trademarks of Green and Gold Energy Pty Ltd

thanks,
Radhika

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[Manu Sharma]

Greg, thanks for the inputs.

Radhika, the purpose of the inverter is to invert DC power produced by the panels and feed them into the grid and/or supply the local load. 

Now, at the time when there's a shortfall, it's met through the grid. Since the grid supply is already AC (alternating current), there's no inversion involved so the solar inverter doesn't come into the picture. As Greg said, it should work regardless of the inverter capacity. 

Thanks,

Manu 

[vinod trivedi]

Is it possible to make AC without compressor with the use of PELTIER (Heat & Cold Process) canbe opereted by single battery and single panel. What do you think about it.???

 

-VINODRAI

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VINOD TRIVEDI
(Manager-New Product Development)
Mobile : +91-99099 58851
E Mail : busybo...@gmail.com, busy...@in.com

Solitaire Trade Link Pvt. Ltd.
Regd. Office :
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[deepak kelkar]

We are trying to put this problem in place by using VF drives for AC.  We are successful is using them for three phase pumps upto 5 hp load.  I think that we should be able to solve this issue.  To power up VF Drives we are using SUNCUBES.

Deepak Kelkar

Deepak Kelkar
Director
Square Engineering Pvt Ltd.
Pune
Cell: 9422310250

[vinod trivedi]

Solar DC Air condition, Refrigereter/Freedger arround 100 ltr. for medicine storage and ceilling fan are required in qty. but no hope right now...........?

 

Vinodrai    

[soumyabrata rahut]

dear Vinod
If you are talking refrigeration for medicinal purpose,you should check out the solar chill.
http://www.solarchill.org/

something that has existed for some time now.

warm regards
soumyabrata

2009/12/28 vinod trivedi <busybo...@gmail.com>

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Soumyabrata Rahut
Consultant
Energy Efficiency
(Prayas Energy Group)

[Amit Dhulla]

hello
we can give it to you in india
we have one of the first WHO approved vaccine refrigeration  which can give 5 days of autonomy sir

u can contact me on
amit dhulla
solar renewable energy p ltd
9930922366