Previous in Forum: Capacitors   Next in Forum: Concept of Nanolectronics
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
12 comments
Rate Comments: Nested
masood
Active Contributor

Join Date: Jan 2009
Location: Pakistan
Posts: 10

Solar Petrol Dispenser

02/26/2012 4:53 AM

Dear All I want to operate petrol pump dispenser through solar energy, it have 1 hp 220 v AC motor. what will be the best solution, 1- in case i use my old motor or change this one by DC motor. 2- what will be the rating of DC motor if it is better. Thanks
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Good Answers:

These comments received enough positive votes to make them "good answers".
TonyS
Guru
United Kingdom - Member - New Member

Join Date: Aug 2010
Location: Resting under the Major Oak
Posts: 4347
Good Answers: 181
#1

Re: Solar petrol Dispenser

02/26/2012 6:05 AM

Whatever motor you use it must match you local regulations for EX equipment.

For this reason I would be reluctant to use DC.

__________________
 The reports of my death are greatly exaggerated.
Register to Reply
masood
Active Contributor

Join Date: Jan 2009
Location: Pakistan
Posts: 10
#2
In reply to #1

Re: Solar petrol Dispenser

02/26/2012 9:06 AM

as already mention we transfer this Dispenser totally on solar energy thats why i want to choose a DC motor for this purpose, we need 1500 rpm motor and following reasons i prefer the DC motor. 1- starting current problem. 2- In case of solar energy we operate Dc motor directly and losses will be minimum. 3- But i want to know if we use 1 HP AC 220V, 1500 rpm motor then its rating will be same in case of DC motor or we reduce the DC motor rating ? actually i want to know how i run my dispenser with minimum solar energy, which motor is best for this purpose.
Register to Reply
2
67model
Guru

Join Date: Dec 2010
Posts: 1686
Good Answers: 116
#3

Re: Solar petrol Dispenser

02/26/2012 10:27 AM

Warning: DC motors spark. Petrol vapour is ignited by sparks. People get killed.

The motor etc you have is built and approved as safe, "explosion proof" [or should be, the motor etc would most likely have "Ex" on its nameplate]. Trouble with insurance if you alter it. Worse trouble if you have explosion without valid insurance!

You would need at least 1 kW solar power cells, plus a battery to store energy for morning/evening/night use when output too low to run motor. Also an inverter/soft starter, compatible with battery input, to get AC able to drive motor.

A lot of work to do.... Better if you can buy a proven system!

Whatever you do, you need to gather information on average and peak energy requirements :-

Litres delivered from pump each day or better, record each hour. Gather litres sold per day information, make usage graph/table for every day for a whole year.

Motor running time per litre.

Motor current, voltage and kW consumption, running.

(Hint, you must have at least a kWh meter for the supply, usually they have a revolutions per unit (kWh) dial or other fine indicator. Put other loads on supply meter OFF. Read meter [you might have to count revolutions and divide by revolutions per unit to get units used]. Run just one pump to fill car tank, record running time, T seconds. Read meter. Calculate kWh "U" used between readings. Calculate power kW = U*3600/T = ?? kWs/s = kW motor input).

You need to build up an average and peak usage to size battery and solar array properly, whoever supplies it.
Register to Reply Good Answer (Score 2)
No more Good Answers.
jack of all trades
Guru
New Zealand - Member - Kiwi Popular Science - Weaponology - New Member Engineering Fields - Power Engineering - New Member Engineering Fields - Electrical Engineering - New Member

Join Date: Sep 2006
Location: Auckland, New Zealand
Posts: 8777
Good Answers: 376
#4

Re: Solar Petrol Dispenser

02/26/2012 1:05 PM

I cannot see how this could be made safe and comply with the required hazardous area standards, certification and local electrical regulations relating to fuel pumps for an industrial application or commercial product (etc).

Is this project for your own personal petrol dispenser? If so, why not just use a manual pump or a much more economical petrol-powered pump (you obviously have petrol available)?

Can you provide more information on your (potentially rather dangerous) application please.

__________________
 jack of all trades
Register to Reply
SolarEagle
Guru

Join Date: Mar 2007
Location: by the beach in Florida
Posts: 33392
Good Answers: 1817
#5

Re: Solar Petrol Dispenser

02/26/2012 2:04 PM

You can use DC for diesel only...Here's a nice system for sale for a couple hundred...

http://www.alibaba.com/product-gs/436816381/Single_nozzle_Fuel_dispenser_mobile_series.html

__________________
 All living things seek to control their own destiny....this is the purpose of life
Register to Reply
indalecio
Participant

Join Date: Feb 2012
Posts: 2
#6

Re: Solar Petrol Dispenser

02/27/2012 1:32 AM

You could deal with 800W DC-motor.

How big your solar system?
Register to Reply
Crabtree
Guru

Join Date: Jul 2007
Location: Commissariat de Police, Nouvions, occupied France, 1942.
Posts: 2599
Good Answers: 77
#7

Re: Solar Petrol Dispenser

02/27/2012 6:20 AM

I don't like the sound of this.

__________________
 Good moaning!
Register to Reply
Amanullah K
Active Contributor

Join Date: Dec 2011
Location: Coimbatore, India
Posts: 10
#8

Re: Solar Petrol Dispenser

02/27/2012 7:50 AM

Dear masood,

Better use inverter to convert DC power to AC power and use the same motor which designed for the hazardous area specification, which is already use in indian oil companies, solar system designed and installed by BHEL.
Register to Reply
masood
Active Contributor

Join Date: Jan 2009
Location: Pakistan
Posts: 10
#10
In reply to #8

Re: Solar Petrol Dispenser

02/27/2012 10:32 AM

as i already mention motor specs are 220v 1 hp 1500 rpm 5 - 60 Ltr /min capacity. Well my dear Ammanullah if i use old motor, then is there any method to reduce starting current problem and improve motor efficiency which is help me to minimize my solar panel cost.
Register to Reply
Doorman
Guru
Hobbies - DIY Welding - Don't Know What Made The Old Title Attractive... Popular Science - Weaponology - New Member United States - US - Statue of Liberty - 60 Year Member

Join Date: Apr 2009
Location: Yellowstone Valley, in Big Sky Country
Posts: 7425
Good Answers: 295
#11
In reply to #10

Re: Solar Petrol Dispenser

02/27/2012 3:12 PM

Masood, have you considered selling this solar generated electricity directly to the electric cars? That will remove quite a few of these problems...

Of course, there may be a few new problems...

__________________
 Semper Ubi Sub Ubi
Register to Reply
Crabtree
Guru

Join Date: Jul 2007
Location: Commissariat de Police, Nouvions, occupied France, 1942.
Posts: 2599
Good Answers: 77
#9

Re: Solar Petrol Dispenser

02/27/2012 8:12 AM

It doesn't matter what C it is if it ignites a flammable atmosphere!

What is the Ex-rating on the motor's plate, Masood?

__________________
 Good moaning!
Register to Reply
masood
Active Contributor

Join Date: Jan 2009
Location: Pakistan
Posts: 10
#12
In reply to #9

Re: Solar Petrol Dispenser

02/28/2012 11:12 AM

My Dear Ex motor rating is give as Rating .78 kw, 220V AC, 3.14 A Induction motor
Register to Reply
Register to Reply
Have a Different Question?
12 comments

Good Answers:

These comments received enough positive votes to make them "good answers".
Copy to Clipboard

Users who posted comments:

67model (1); Amanullah K (1); Crabtree (2); Doorman (1); indalecio (1); jack of all trades (1); masood (3); SolarEagle (1); TonyS (1)

Previous in Forum: Capacitors   Next in Forum: Concept of Nanolectronics

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Electrical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (82 right now)
Show Members
Advertisement