Solar Panel Kw Cost
GCSE physics past paper question (involves maths)?
Electricity supplied from the National Grid costs 8p per kilowatt-hour.
A householder is considering installing solar cell panels. The household uses 4000kWh of electricity each year. The cost of installing a solar cell panel is £6400 per kW.
What is the payback time?
a) 4 years
b) 8 years
c) 40 years
d) 400 years
Please could someone help me, how exactly do I do that question?
EDIT:
Multiverse, I don’t know but that’s what it says..
Total cost for a year = 4000kWh x £0.08
= £320
If the house instead uses Solar cell panels,
Lets say it costs him £6400 to install the panel
Lets assume the solar panel supplies him all his electricity.
Therefore, hes saving £320 a year on electricity.
Payback time = Initial cost / savings in fuel costs
Payback time = 6400 / 320
= 20 years.
Recheck the question and ehmm do you have the mark scheme? Im sure its 20 years
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