How solar photovoltaic electrification works?
How solar photovoltaic electrification works?
CI
Sustainability of solar systems
Actual Cost Comparison
Comparison of real costs of solar energy
600
6
3.600
660
3,6
25
144
3.600
100
2,4
864
0,17
24-hour use with refrigeration equipment or other 24-hour service
The energy produced (KWh) is divided by the cost of the equipment and fuel ($): the maintenance cost is not calculated here.
KWh cost of solar panel
$ panel acquisition cost
Number of panels
$ panels acquisition cost
watt rated power
sun hours / day
years panel life
$ / year (annual cost of solar panel acquisition)
gal gasoline / h
$ / gallon gasoline **
$ gasoline ** / day
$ gasoline ** / year
$ / year (panel cost per year)
(= acquisition cost / years of useful life)
$ / 25 years (panel cost for 25 years)
W Average power used in 24 hours
kWh/day
kWh / year
$/solar kWh
2.000
2.000
2.000
2
1.000
0,3
1,1
7,9
2.851
3.851
96.280
100
2,4
864
4,46
$ motor generator acquisition cost
$ motor generator acquisition cost
watt rated power
years useful life of the motor-generator
$ / year (annual cost of generator acquisition)
gal gasoline / h
$ / gallon gasoline **
$ gasoline ** / day
$ gasoline ** / year
$/year (gas** and motor cost per year)
$ / 25 years (gasoline **
W Average power used in 24 hours
kWh/day
kWh / year
$ / KWh motor generator (without maintenance)
* Note: most generators
cannot work 24 hours a day.
** the cost of gasoline varies by site
KWh cost of the motor generator
In this real example, the motor-generator works 24 hours a day, but the average load in the 24 hours is low. However there is a high cost of fuel.
In the example above, the solar energy produced is stored in batteries and only the necessary energy is delivered to consumers.
An installation with use of 24 hours a day only with the motor generator cannot be profitable:
. We suggest "Hybrid systems" or power backup systems.
600
10
6.000
1.100
3,6
25
240
6.000
1.000
4
1.439
0,17
To focus on a situation with more advantage of the motor-generator over the solar panel, we calculate in this example only the schedule of the four hours from 6:00 p.m. to 10:00 p.m. of high consumption per day (the rest of the time there is no light):
Use of only 4 hours per day.
KWh cost of solar panel
$ panel acquisition cost
Number of panels
$ panels acquisition cost
watt rated power
sun hours / day
years panel life
$ / year (annual cost of solar panel acquisition)
gal gasoline / h
$ / gallon gasoline **
$ gasoline ** / day
$ gasoline ** / year
$ / year (panel cost per year)
(= acquisition cost / years of useful life)
$ / 25 years (panel cost for 25 years)
W Average power used in 24 hours
kWh/day
kWh / year
$/solar kWh
2.000
2.000
2.000
2
1.000
0,3
1,1
1,32
475
1.475
36.880
1.000
4
1.439
1,02
$ motor generator acquisition cost
$ motor generator acquisition cost
watt rated power
years useful life of the motor-generator
$ / year (annual cost of generator acquisition)
gal gasoline / h
$ / gallon gasoline **
$ gasoline ** / day
$ gasoline ** / year
$/year (gas** and motor cost per year)
$ / 25 years (gasoline **
W Average power used in 24 hours
kWh/day
kWh / year
$ / KWh motor generator (without maintenance)
** the cost of gasoline varies by site
KWh cost of the motor generator
600
6
3.600
120
6
720
4.320
660
3,6
25
144
5
144
288
288
7.200
600
2,4
864
0,33
This example also includes the costs of the accumulators together with the panels.
To focus on a situation with more advantage of the motor-generator over the solar panel, we calculate in this example only the schedule of the four hours from 6:00 p.m. to 10:00 p.m. of high consumption per day (the rest of the time there is no light):
Use of only 4 hours per day
Solar system kWh cost
$ panel acquisition cost
Number of panels
$ total cost of panel acquisition
$ accumulator acquisition cost
Number of accumulators
$ total acquisition cost batteries
$ acquisition cost of panels and batteries
watt rated power
sun hours / day
years panel life
$ / year (annual cost of purchasing solar panels)
years useful life of the accumulator
$ / year (accumulative annual acquisition cost)
$ / year (annual cost of purchasing panels and batteries)
(= acquisition cost / years of useful life)
gal gasoline / h
$ / gallon gasoline **
$ gasoline ** / day
$ gasoline ** / year
$ / year (panels and batteries cost per year)
$ / 25 years (panel cost for 25 years)
W Average power used in 4 hours
kWh/day
kWh / year
$/solar kWh
2.000
2.000
2.000
2
1.000
0,3
1,1
1,32
475
1.475
36.880
600
2,4
864
1,71
$ motor generator acquisition cost
$ motor generator acquisition cost
watt rated power
years useful life of the motor-generator
$ / year (annual cost of motor-generator acquisition)
gal gasoline / h
$ / gallon gasoline **
$ gasoline ** / day
$ gasoline ** / year
$/year (gas** and motor cost per year)
$ / 25 years (gasoline** and motor cost per year)
W Average power used in 4 hours
kWh/day
kWh / year
$ / KWh motor generator (without maintenance)
** the cost of gasoline varies by site
kWh cost of the motor generator
Compared to the first example, it can be stated that the costs of the generator dropped significantly, because it does not work all night with very little load.
In any case, the cost of the energy generated by the motor generator is still ten to fifteen times higher than that of solar energy.
In this example the sustainable cost of the accumulators has NOT been calculated, which will be done in the next example.
It can be generalized that the real cost of energy or per KWh with the motor generator is five times more expensive than that of solar energy. In the last example, it can be seen that the strong initial investment for the solar system is balanced after a year and a half with the costs of the motor-generator and fuel.
Here it is necessary to disclose information and perhaps support with 24-month soft loans, so that low-income families will have the possibility of acquiring solar systems.
In favor of solar systems, it should be noted that panels and batteries can be purchased gradually, and thus reach the actual size of the solar system within two years.
Sustainable cost
To really compare costs, you have to add a supposedly "not real" cost, for ending the oil resources, maintenance and pollution.
Much of this cost is paid by our grandchildren later:
We will face the situation when they will put A VALUE on this cost.
Solar system for sale of parking tickets
