How fast is your solar investment returns?

[gmarkolt]

I was trying to find a calculator on the internet what can show me how fast is my system start making money. I have not found any, that is why I created one.

https://www.solarreturn.info

[russ]

@ Gmarkolt - Tried it but it didn't function.

The 4 inputs that I saw are only part and even a small part of the whole story.

If anyone is looking for a calculator I suggest you go to http://sharpusa.cleanpowerestimator.com/sharpusa.htm

A detailed and good calculator that has a large data base behind it.

[wjgrisham]

I was trying to find a calculator on the internet what can show me how fast is my system start making money. I have not found any, that is why I created one.
www.solarreturn.info

Great idea and good work! Like I have said I am new be at this but just from some of the information I have found out so for I has been a dig help.
Bill

[Sunking]

You are not looking very hard. There are many sites that will do this, and they actually have much better data bases with each states rebate programs and power company rate base built in.

Of course they are all pretty much dishonest and designed to make the numbers look good. For example they do not take into account most folks get a loan which is very silly thing to do. With a loan comes interest rates. They also assume a very high rate of inflation in electric rates. Where I live electric rates have fallen +25% in the last two years, not gone up 15% per year as the models suggest.

[gmarkolt]

@ Gmarkolt - Tried it but it didn't function.

The 4 inputs that I saw are only part and even a small part of the whole story.

If anyone is looking for a calculator I suggest you go to http://sharpusa.cleanpowerestimator.com/sharpusa.htm

A detailed and good calculator that has a large data base behind it.

I am sorry but that calculator actually try to selling you a fixed solar system what is good for your house.

Please show me how can you calculate with that calculator, if somebody buys 400 watt solar panel and an inverter, and try to find out if the price what he/she paid for it was worth it!

Try it again it is working, and you will get it what is it for!

[gmarkolt]

Sunking:

You absolutely right, because I don't have any data base, so they should be much better on database level

I will talk to you in 2020 about the price of the electricity.

[gmarkolt]

wjgrisham:

Thanks! You are the first fan of my work.
This calculator helps to find out if the price what somebody asking for a system is worth it or not.

[russ]

Quote, 'Please show me how can you calculate with that calculator, if somebody buys 400 watt solar panel and an inverter, and try to find out if the price what he/she paid for it was worth it!'

Tried your calculator again and it worked. Think I used the Turkish decimal point which is a comma the first time.

The Sharp calculator starts with a 1000 watt array.

I see what you are trying to do but there are far more details to consider than simply 1) system cost, 2) DC watts, 3) electricity cost, 4) avg hours of sunlight. coming out to a payback period.

There are many other factors to consider such as 1) orientation, 2) tilt, 3) type of rate (TOU etc), 4) expected electricity escalation rate, 5) payment method, 6) interest rate if a loan is used, 7) tax status, 8) subsidies and incentives available in your area, 9) FIT is applicable.

The Sharp calculator provides estimates on 1) monthly cash flow, 2) projected daily output, 3) projected monthly electricity bill, 4) pay back period and other information.

TOU rates can make a very big difference - especially with a rate structure such as California has.

Russ

[gmarkolt]

I see what you are trying to do but there are far more details to consider than simply 1) system cost, 2) DC watts, 3) electricity cost, 4) avg hours of sunlight. coming out to a payback period.

There are many other factors to consider such as 1) orientation, 2) tilt, 3) type of rate (TOU etc), 4) expected electricity escalation rate, 5) payment method, 6) interest rate if a loan is used, 7) tax status, 8) subsidies and incentives available in your area, 9) FIT is applicable.

Russ

I understand you, but I am doing a different approach with my calculator.
That is why at the result you see "less than"

on the other hand this is not a loan or lease calculator such as a sharp one

believe me, your 8 point is useful when somebody wants to make a complex calculation, but for a quick check on the system price and it's worthiness, I think it is perfect .