Help Required for Installing Solar Energy at my Home

[inetdog]

No parameter is ever set until a project is complete.

Isn't that why the only drawings worth having are the as-builts?
Now if only you could get those up front. (In another forum there is discussion of inspectors who want to see the field tests of efficient lighting systems signed off before they approve the permit to start installing. )

[russ]

Typical - I face this daily. No parameter is ever set until a project is complete.

Some wonderful people here but too many like this fellow also.

[Mike90250]

Dear Mike,

First of all i would like to say thanks for your kind help.

Second thing: Why are you angry? You are a Moderator of this site and you should be calm and responsive.
If you think that i am wasting your time than for what purpose you are on this site???

If you are a moderator than its your duty to help those members who need some awareness or information regarding solar energy. If you will not help and think that members are wasting your time than who will join your website?

I was just trying to get the answer of my questions as i am a newbie in the field of Solar Energy. Sorry if i wasted your valuable time.

Thanks once again.

I'm not angry, just disturbed that my valuable time was spent going in circles with you. Over, and over.

[russ]

Thanks alot Mr. Admin,

I can understand you but Mr. Mike was using hard words that why i replied with the same.
I know your team is doing great and i wish the success for your site but plz instruct your moderators to be calm atleast with new members.

Regards

Hayatpower - Get a life - It is standard practice in India to ask a question a thousand ways and then pretend to be innocent - I have worked there for more than 16 years.

You are instructed to remember that you are asking for FREE advice. You can always get the same at home by paying of course.

You have to love a newbie showing up and wanting to give instructions. Of course that is standard practice there.

[hayatpower]

He is not angry but you do have to understand that a moderator is an unpaid position we do this for free. So it gets frustrating at times to have someone ask us to do a lot of calculations (Which if searched you would find that almost every question you could ask has been asked before) then do a switch on the system parameters which changes everything.
It is best to ask all the questions at once and give all the information you know like when it will be used etc.

Thanks alot Mr. Admin,

I can understand you but Mr. Mike was using hard words that why i replied with the same.
I know your team is doing great and i wish the success for your site but plz instruct your moderators to be calm atleast with new members.

Regards

[Naptown]

Dear Mike,

First of all i would like to say thanks for your kind help.

Second thing: Why are you angry? You are a Moderator of this site and you should be calm and responsive.
If you think that i am wasting your time than for what purpose you are on this site???

If you are a moderator than its your duty to help those members who need some awareness or information regarding solar energy. If you will not help and think that members are wasting your time than who will join your website?

I was just trying to get the answer of my questions as i am a newbie in the field of Solar Energy. Sorry if i wasted your valuable time.

Thanks once again.

He is not angry but you do have to understand that a moderator is an unpaid position we do this for free. So it gets frustrating at times to have someone ask us to do a lot of calculations (Which if searched you would find that almost every question you could ask has been asked before) then do a switch on the system parameters which changes everything.
It is best to ask all the questions at once and give all the information you know like when it will be used etc.

[hayatpower]

But don't ask me piecemeal about a system, and then say, oh, just for nighttime, because you waste
my time, and have lead me to calculate the wrong answers for you.

Dear Mike,

First of all i would like to say thanks for your kind help.

Second thing: Why are you angry? You are a Moderator of this site and you should be calm and responsive.
If you think that i am wasting your time than for what purpose you are on this site???

If you are a moderator than its your duty to help those members who need some awareness or information regarding solar energy. If you will not help and think that members are wasting your time than who will join your website?

I was just trying to get the answer of my questions as i am a newbie in the field of Solar Energy. Sorry if i wasted your valuable time.

Thanks once again.

[Mike90250]

One more thing i want to ask that if i want to use solar energy only in night time than how many solar panels are required to fully charge my inverters battery?

Then you re-reun the math, but just for the amount of power needed for nighttime, instead of the whole day, I don't know how much of 9KWh you use day:night.

Is there any special battery or inverter for solar energy?

Yes. Batteries must be Deep Cycle. If you cannot find Deep Cycle, Golf Cart batteries (6v or 4v) are
generally the next best thing.

Inverter is generally, pure sine wave, which keeps everything happy. Motors, Fridge, small electronics. Some devices (about 20%) fry in a couple minutes on Modified Sine wave inverters. Motors take a while longer. Mod Sine also causes gear to consume 20% more power than pure sine, and you must account for that extra loss of efficiency when sizing PV array and batteries. For the amount of power you are needing, a 48 volt system is recommended.
Avoid any configurations where you need parallel batteries. While it can be done, it's difficult to accomplish correctly.
And do not "skimp" when sizing your system, if you undersize something, it will cause something else to fail sooner and you will be unhappy.

But now I ask. If you only need power at night, then I assume you have grid power daytimes ? if you have grid power, solar power is always 10x more expensive. you have battery replacements every 5-7 years. Cable bolt tightening yearly. Battery water monthly. If you need power for grid failures, recharge a smaller battery bank from the grid, not solar.

But don't ask me piecemeal about a system, and then say, oh, just for nighttime, because you waste
my time, and have lead me to calculate the wrong answers for you.

[hayatpower]

Dear Mike90250,

Thanks for your valuable reply.

One more thing i want to ask that if i want to use solar energy only in night time than how many solar panels are required to fully charge my inverters battery?

Is there any special battery or inverter for solar energy?

[Mike90250]

Your yearly average sun is 6 hours daily, but December falls to 3.3 hours


So you can just plug that new # into the formula I posted:

you need to harvest 9Kwh in that 4 hours

9000 / 3.3 = 2700 watts of PV panels. I have no idea what your cost to purchase panels in your neighborhood is , but here in USA, I would likely pay about $2 per watt, for decent panels.
Then you need batteries, 4x your daily usage, to minimally discharge them for longest life.
A 36KWh battery could be sized at 48V, 800 ah to meet your need. An inverter, charge controller,
fuses, and a secure room to build this all into, would complete the system.

[russ]

Dear Mike90250,


As minimum sun hours in my city is 6 hours a day. It means 180 hours in a month from http://www.gaisma.com/en/location/delhi.html

3.36	4.36	5.56	6.53	7.00	6.34	5.51	4.93	5.18	4.86	4.08	3.31

As per mentioned website:

Energy Cost per kWh: 1.84 rupee A slight problem here - your power costs far more that 1.84 Rs - On an industrial basis and wholesale we pay far more than that for power off the grid.

So how many Solar Panels are required to meet my power demand?
What about the connections between solar panels and my inverter?
Can i charge my battery at the same time when i am using solar power through my Inverter?
Is there any idea of cost of 1 Solar Panel?

Thanks in advance

Comments in bold within the text. I am presently in Gujarat.

[hayatpower]

OK, using your numbers, first you need to go to to a site to determine your month of minimum sun hours.
http://www.nrel.gov/rredc/pvwatts/site_specific.html is a suggestion

Lets assume 4 hours, that means you need to harvest 9Kwh in that 4 hours. That calls for about 2,250 watts of PV panels to meet that demand.

Dear Mike90250,


As minimum sun hours in my city is 6 hours a day. It means 180 hours in a month


As per mentioned website:

Energy Cost per kWh: 1.84 rupee

So how many Solar Panels are required to meet my power demand?
What about the connections between solar panels and my inverter?
Can i charge my battery at the same time when i am using solar power through my Inverter?
Is there any idea of cost of 1 Solar Panel?

Thanks in advance

[Mike90250]

....Energy Consumption per day = 6 KW...Around 180 Units/KW per Month

OK, using your numbers, first you need to go to to a site to determine your month of minimum sun hours.
http://www.nrel.gov/rredc/pvwatts/site_specific.html is a suggestion

Lets assume 4 hours, that means you need to harvest 9Kwh in that 4 hours. That calls for about 2,250 watts of PV panels to meet that demand.

[hayatpower]

What is your current electric bill watt hours (or Killowatt hours) for average month last year ?
That's the place to start.

Energy Consumption per Hour= 0.50 KW P/H (Used Approx 12 Hours)
Energy Consumption per day = 6 KW
Around 180 Units/KW per Month

[Mike90250]

What is your current electric bill watt hours (or Killowatt hours) for average month last year ?
That's the place to start.