Tima, you are ignoring the idea of portability of energy in your comparison. A solar panel, especially a little one at 200 watts, gives energy mobility. Your comparison with the efficiency of a stationary thermal generation plant ignores that mobile equipment is always less efficient. The only correct comparator for that mobile energy is something that approximately matches the panel in energy output and mobility - say a 1/4 hp gas motor. Want to compare energy generation and environmental impact over a 20 year lifespan between a tiny gas motor and a solar panel? Probably not.
I think boats - all boats - have significant environmental impact. I have a friend who lives aboard a 45'
On Apr 17, 2018, at 6:58 PM, tema.zloitapok@gmail.com [electricboats] <electricboats@yahoogroups.com> wrote:
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On Apr 17, 2018, at 6:58 PM, tema.zloitapok@gmail.com [electricboats] <electricboats@yahoogroups.com> wrote:
"The truth is that that the Energy returned from Solar panels far outweighs the environmental cost of manufacturing them."
lets take a 100W solar panel as example. It produces average 500 Wh of energy per day.It is 182.5 kWh per year and 3.65 MWh over 20 years lifetime.
How much you need to burn coal to produce similar energy?Modern coal power staions have effectivity ~45%.Burn 1 kg of coal-anthracite will get a 7.5 kW of thermal energy.7.5 kW * 45% = 3.375 kW of electric energy
Lets compute amount of coal needed to get 3.65 MWh:3.65 MWh / 3.375 kW = 1081 kg of coal.
Is 100W solar panel really outweighs the environmental cost of manufacturing them related to 1 ton of burned coal?
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Posted by: Gordon Buzzard <gordon.buzzard@viu.ca>
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