00:01
In this question we're going to be looking into the economic visibility of using solar panels.
00:05
So the first part of the question is asking us to compare the 240 watt panels against the 140 watt panel.
00:12
So the approach that we're going to use here is to first of all calculate the power that can be delivered, the kilowatt power that can be delivered by each of these panels within a month, and then convert to the number of panels, panels that are going to be required for each one.
00:30
Each panel because we know the electricity that must be used by each house or per month.
00:37
So after we get the number of panels, we can then convert to cost because we know the cost per panel.
00:44
So let's look at the 140 watt panel.
00:49
So within a month we've got 30 days multiplied by 5 hours and this panel is rated at 140 so this is going to be 21 ,000 watt hour.
01:10
This is the total energy that can be delivered or the total power that can be delivered within the month.
01:17
This is equal to 21 kilowatt hour.
01:22
So moving on to the second part, we know that each household requires 9, 4, 8 kilowatt hours.
01:33
So we can therefore calculate the number of panels to be equal to 948 divided by 21.
01:44
This is equal to 46 panels.
01:49
So we know that the cost each panel costs, each panel costs $210.
01:56
So the total cost will be equal to 210 multiplied by 46 panels which is equal to 9.
02:11
660 dollars now let's compare this to the 240 watt panel so they'll be running at 30 times 5 hours each per day multiplied by 240 this is going to give us 36 ,000 36 ,000 watt hour which is equal to 36 kilowatt hour so within a month this is what a 240 watt hour 240 watt panel is able to deliver so the number of panels that will be required are equal to 948 divided by 36 which is equal to 27 already you can see with the 24 with the 240 watt panel we are going to need a few almost half the panels that we need for a 140 let's move on to just look at the cost because at the end of the day we are rating this against the total cost so the 240 watt panel cost 260 so the total cost is going to be 260 multiplied by 27 panels this is equal to 7 02 so comparing this cost we have got 70 is less than what did we get for the we have 9 ,660 therefore the 240 watt panel are more beneficial so if this household uses 240 what panel they are going to save 966 minus 70 to 0 this is equal to 9660 minus 70 to they're going to save 2640 2640 to 640 thousand dollars per map okay moving on to the next part of the question this part of the question is asking for the save for the that we're going to have if we install the 12 -hour the 12 -watt solar panels.
05:27
We know that this household, which household will be using on average, for 948 kilowatt -hour per month.
05:38
And per month, for the 240 -watt panels, we're going to need 27 panels and each panel is going to be delivering 36 kilowatt hour.
05:51
So the savings that we're going to have, we've got 27 panels each delivering 36.
06:00
So the difference here from 948 is what is in excess or what we are serving...