Can we operate induction stove by solar

[Anchal Agarwal]

Hello everyone,

We are looking for possibilities to operate induction stoves on solar energy. Please give your suggestions, if anyone had tried any model then please provide us details of the same.

With Regards,

Anchal Agarwal

+91 9454689488

[Manu Sharma]

Anchal,

Theoretically you could but the question is does it make any sense? Given enough solar panels, you could power a house, a large building or even an entire city. The question is not, can you, the question is, should you. 

If you wish to utilise solar energy for cooking, the first option you should consider is to cook directly with a solar cooker either parabolic or box based one. Buying panels to power an induction cooker is an inefficient way to go about it. Not to mention an expensive one. 

But if the idea is to get the greatest return while trying to reduce cooking fuel expense, consider energy conservation in the kitchen. There's a conservation techniques that can cut your fuel use easily by half and up to 75% for some specific kinds of food by spending a fraction of amount you'd spend on a solar cooker and much less than what you'd spend on domestic biogas plant. 

As always, energy efficiency and conservation triumphs over renewable energy. I'm conducting some experiments and will make a new post that will elaborate on this technique soon.

Manu

[Rajesh Radhakrishna]

hi,
we have managed to develop a prototype solar induction stove.will be launching it shortly.are you looking out for buying it in lot ?do let me know.
my email id is :seahors...@gmail.com

[Subhash Aj]

yes 

it is possible we are cooking all food by solar induction cooker, with using 10watts12 volts  15panels and 12volts10 ah  14 batteries,for details call me on 9738343040

subash tvcare banglore

[Krishna Engineers & Consultants]

Dear Sir,

Thanks. Please let us know the cost of the system along with the
performances. Please also suggest whether we can get the system from
you.

Regards.
Pramod Hati

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[Venkat Ramamurthy]

Hi Rajesh,

I am interested in the solar induction stove, plz let me know if it has been launched.

Thanks,

Venkat

[Subhash Aj]

yes we invented solar powered induction cooker its launch soon

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[Pratik Savaliya]

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[Manu Sharma]

Cooking food on an induction stove powered by solar panels, with perhaps a battery bank and inverter in between, is a convoluted way of using solar energy for cooking when far simpler solar cooking systems are available. 

Dish and box based solar cookers have been around for a long time and work well. With some patience and little skill you can even build your own. I don't understand why people get excited by technology for the sake of technology. Why only high-tech is worth aspiring when low technology can achieve the same aims at drastically lower cost and energy.

Manu

[Kaushik]

Sir
All technology has some advantages n limitations. Where as solar cooker are good for daytime, it may be not useful in night. Also with compact living in metro area, we become more dependent on electricity for lighting etc
This induction cooker concept may be a good option if put up in hybrid solar system

Regds

Kaushik

[Manu Sharma]

All right, let's look at the efficiencies of the two systems proposed here -- solar panels + battery bank + inverter etc + induction cooker -- versus solar cooker. 

Let's say we begin with 100 units of solar energy available. 

• About 86% of it is not captured by solar panels. 16 units are converted to electricity.
• Out of that about one fourth are lost in DC-AC conversion and energy storage. So you're left with 12 units.
• Then the induction cooker again looses about 85% of thermal energy as they are only about 15% efficient. 

So we're left with 1.8 units of usable thermal energy out of 100 units that we started out with. 

Compare that with around 40.6% average overall thermal efficiency of a box based solar cooker that is made to track the sun. 

In other words, for the sake of convenience people are queuing for a induction based solar cooking system that's about 23 times less efficient than the good old solar cooker! 

Manu

[Kaushik]

Manu Sir
You are absolutely correct on the conversion n efficiency part. The application, sometime demands less efficient equipments also be put into service. The situation in most of metro flats demands these type of article be pressed into service sometime.

Regds

Kaushik

[Prabhakar Kambale]

Manu Sharma,
You are correct,sir.
'Why only high-tech is worth aspiring when low technology can achieve the same aims at drastically lower cost and energy'.

The efficiency & costs need to be considered.

Prabhakar V. Kambale

[Girish Iyer]

Hi Manu,

 

Though my observation is not about solar induction cooker or solar cooker, Just wondering about your response of solar PV.

 

When you say 100 Units are available and the solar panels capture only 16 Units what do you mean, if you mean that because panel efficiencies are 15-16% only then what i understand is that you need bigger sized panels to capture the full power. so suitably sized panels can capture the full 100 units.

 

Correct me if i am wrong, Solar Irradiation of 1000W / Sq Mtr means that for a panel of 1 sq mtr we should get 1000W but in practical we would need around 6.64 Sq mt of panels to generate 1000W.

 

Sorry everybody for a comment which is off your discussion

 

Rgds

[Manu Sharma]

Hi Girish,
I meant efficiency of solar panels which is in that range.
Manu

>>>> - About 86% of it is not captured by solar panels. 16 units are
>>>> converted to electricity.
>>>> - Out of that about one fourth are lost in DC-AC conversion and

>>>> energy storage. So you're left with 12 units.

>>>> - Then the induction cooker again looses about 85% of thermal energy

>>>> as they are only about 15% efficient
>>>>

>>>> <http://www.lowtechmagazine.com/2014/06/thermal-efficiency-cooking-stoves.html>
>>>> .

>>>>
>>>> So we're left with 1.8 units of usable thermal energy out of 100 units
>>>> that we started out with.
>>>>
>>>> Compare that with around 40.6% average overall thermal efficiency of a

>>>> box based solar cooker <http://jjmie.hu.edu.jo/files/v5n1/JJMIE-16.pdf>

[Anand Sivaram]

Manuji,

I completely agree, PV, Inverter, Induction Cooker combination would be an over engineering

if you want to do Solar based cooking.
 

However, your efficiency number on Induction cooker is not correct.  I think the link you mentioned even calculate power generation efficiency losses also.  But, if you calculate the efficiency from Electricity to Heat, then Induction Cooker is around 85% efficient as per Wikipedia.  Whereas good quality gas stove has an efficiency of around 60% or so.

Induction Cooker could be considered as a Transformer, but at around 25KHz.  Here the cooking vessel acts as the secondary coil of the transformer.  So, just like a transformer when the secondary load is less, it pulls less current from the primary taken from AC mains.

Another main difference compared to all other forms of stoves including biomass, gas, electrical coil stove etc. is that, they produce heat first, then conduct it through the vessel, whereas in Induction Cooker the heat is produced in the Vessel itself.  So conventional stoves use heat PUSH model whereas Induction Cooker uses heat PULL model. That means if you are using a bad vessel with conventional stove, you lose a lot of heat because the vessel could not transfer that heat, whereas in Induction Cooker, that would result in pulling lower current from the primary coil leading to pulling less current from AC mains, means the efficiency is not compromised.

Thanks and Regards

Anand

http://saurorja.org
Twitter: @anand_sivaram

[Manu Sharma]

Hi Anand,

I'm happy to be corrected. The source I linked didn't mention that efficiencies are calculated from primary energy. In the final analysis solar cooker is still about 4 times efficient than the induction system proposed here. 

Thanks,

Manu

[chakrawarthy]

Efficiency apart, Solar-cookers win hands-down when it comes to the quality of the cooked-stuff.

Far ahead in the world of  "zero-pollution" .

Just as induction cookers are powered by the grid-power (which anyway is "erratic" in most households in India)

Solar-cookers have a "very-small" limitation of "inherently" being a Solar-powered gadget.

Dr. Srinivasa Chakrawarthy Ravuri, Ph.D

Renewable-Energy Applications


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[Dhaval]

Dear Mr.Manu,
I am also big fan of off-shelf and low-end technology for all. Solar has become a point of talk in parties so it can't be avoided with high-end marketing.. Same way many reference material from research can be misinterpreted.
For shake of everyone's knowledge, I would like to up-bring correction in your calculation.. Induction stoves are 80-92% efficient in conversion of electricity to thermal energy (depending on brand & manufacturing). But as stated in article they are 15% efficient due to thermal energy to electrification losses of power plant 70%, transmission & distribution losses of 10% then on, low power demand time power loss 10% and electrification to thermal loss of 15% and heat loss from cooking appliance/utensil is 28% all numbers are on reducing application (I have put round figures e.g. T&D loss in India is more than 30%, induction efficiency would be 75-85% ect.)..
100% thermal power of coal - 70%
30% - 10% = 27%
27% - 10% = 24.3%
24.3% - 15% = 20.66%
20.66  - 27% = 15.08

If we take your calculation then final efficiency should be 7-8% instead of 1.8% or units..

As devils advocate (though it might prove to be good solution for many), 7-8% efficiency with convenience of fast cooking, indoor, night cooking, variety of appliances and variety of cooking method could be great advantage to many.

Let us create many solutions but make sure it gives best efficiency and add value to ecology & economic.

[Manu Sharma]

Dhaval, 

That's correct. Anand also pointed out the same and I conceded as much in my response.

I'm happy that at least someone is paying attention!

Thanks,

Manu