A method & spreadsheet to evaluate getting solar panels

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A method & spreadsheet to evaluate getting solar panels

Postby persist » Sat Nov 14, 2015 10:58 pm

When considering buying solar panels I worked out:
. A method of financially evaluating getting the panels and
. Constructed a spreadsheet to do the calculations.

Now I have put on my web site:
. A description of the method
. The spreadsheet (no cost)
. Ideas on how to get your data
. Ideas on how to evaluate you panels.

I think this could be useful to others. I’d be interested to hear whether others find it useful or have suggestions for improving it. Could some people have a look at it for me?

http://www.feedbackreigns.net/economics ... inancially

My web site promotes action on climate change. There are no commercial interests here. I want to make my web site more useful.

I briefly searched the web, but the guides I found seemed to want you to provide to them your data. I am wary of that.

The full details are on the web site but here are a few more details:

The calculations provide:
. The return from the panels as a percent of the system cost, e.g. 8 % a year
. The payback period for the panels, e.g. 11 years, and
. The cost of panel electricity over the life of the system, e.g. 7.7 cents/kWh

The data used is:
. Average daily solar electricity generated in the first year, e.g. 8 kWh/day
. The loss of generation over the system life, e.g. 20%
. The Installation cost, e.g. $ 3,600
. Extra installation costs e.g. meter change cost $ 200
. The expected panel system life, e.g. 25 years
. Current electricity cost from the grid, e.g. 24 cents/kWh
. Price increase of electricity from the grid, e.g. 3 % a year
. The average panel electricity used in the home per day, e.g. 3 kWh/day
. The average total electricity used in the home per day, e.g. 9.5 kWh/day
. The income from panel electricity sold to the grid, e.g. 6 cents/kWh
. The average maintenance costs, e.g. $20 a year

The spread sheet can also help you compare investing in solar panels with investments where you get your money back at the end of the investment, like putting your money into a savings account or into a term deposit. The data used to get the percent per year return from these investments is:
. Investment interest paid, e.g. 2.7 % / year
. Tax paid on an extra dollar earned, 36 %
. Inflation rate, e.g. 2.1 % / year

Any feedback welcome
persist
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Joined: Sat Nov 14, 2015 10:33 pm

Re: A method & spreadsheet to evaluate getting solar panels

Postby persist » Sun Nov 15, 2015 3:59 pm

My apologies.
I have been having technical problems with my website
so I moved the "solar panel financial evalation" to

http://www.feedbackreigns.net/solutions ... ar-panels/
persist
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Posts: 2
Joined: Sat Nov 14, 2015 10:33 pm


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