Solar Calculations: Difference between revisions
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*1kW pv system - 1400 kWhr | *1kW pv system - 1400 kWhr | ||
**6 hr/day average - not! 3-4.5 kwhr/day [https://www.solarmango.com/ask/2015/07/19/how-many-units-of-electricity-does-a-1-kw-solar-power-plant-generate-in-a-day-in-a-year-ask-solar-mango/] | **6 hr/day average - not! 3-4.5 kwhr/day [https://www.solarmango.com/ask/2015/07/19/how-many-units-of-electricity-does-a-1-kw-solar-power-plant-generate-in-a-day-in-a-year-ask-solar-mango/] | ||
*Fuel is about 35 kWhr/gal [https://en.wikipedia.org/wiki/Gasoline_gallon_equivalent] | *Fuel is about 35 kWhr/gal [https://en.wikipedia.org/wiki/Gasoline_gallon_equivalent]. Let's say it's used for generating electricity - about 33% efficient - [https://www.google.com/search?q=how+efficient+is+a+typical+coal+power+plant&sxsrf=APq-WBt-F20VFZEkLh8Bo4p3-1eSQWhxaA%3A1649179594699&ei=yntMYsmTKsC4qtsPurGSyA0&ved=0ahUKEwjJoKbfuP32AhVAnGoFHbqYBNkQ4dUDCA4&uact=5&oq=how+efficient+is+a+typical+coal+power+plant&gs_lcp=Cgdnd3Mtd2l6EAMyCAghEBYQHRAeMggIIRAWEB0QHjIICCEQFhAdEB4yCAghEBYQHRAeMggIIRAWEB0QHjoHCAAQRxCwAzoFCAAQkQI6EQguEIAEELEDEIMBEMcBEKMCOgsILhCABBDHARCjAjoLCAAQgAQQsQMQgwE6DgguEIAEELEDEMcBEKMCOggIABCABBCxAzoECAAQQzoQCC4QsQMQgwEQxwEQowIQQzoLCC4QgAQQxwEQrwE6BQgAEIAEOgsILhCABBCxAxDUAjoOCC4QgAQQsQMQgwEQ1AI6BAgAEAo6BwgAELEDEAo6BAgAEA06BggAEBYQHjoFCAAQhgNKBAhBGABKBAhGGABQ5QRYv0NggURoBnABeACAAYIBiAGoIJIBBDM5LjiYAQCgAQHIAQjAAQE&sclient=gws-wiz]. | ||
*To get electricity - 11 kWhr/gal equivalent. Gal is about 3 kg | |||
*This gets us to 127 gallons of fuel displaced - 42 gal. Ie - each kW installed gets rid of 3 barrels of oil! | |||
*Let's do PV roof on [[SEH]] - 7 kw - 21 barrels of oil displaced! | |||
*At low limit, we have 3 kWhr/kW installed per day - or 21 kWhr available per day. | |||
*[[Average Electricity Cost]] implies $2.73 available per day. That is almost exactly $1k saved per year at the low limit. Makes sense. But we are also efficient on heat pump - for cooling and heating - saving heating bills in winter. And we cook on electric and heat water electric - saving on the gas costs. So displaced costs are | |||
Latest revision as of 11:50, 7 April 2022
- 1kW pv system - 1400 kWhr
- 6 hr/day average - not! 3-4.5 kwhr/day [1]
- Fuel is about 35 kWhr/gal [2]. Let's say it's used for generating electricity - about 33% efficient - [3].
- To get electricity - 11 kWhr/gal equivalent. Gal is about 3 kg
- This gets us to 127 gallons of fuel displaced - 42 gal. Ie - each kW installed gets rid of 3 barrels of oil!
- Let's do PV roof on SEH - 7 kw - 21 barrels of oil displaced!
- At low limit, we have 3 kWhr/kW installed per day - or 21 kWhr available per day.
- Average Electricity Cost implies $2.73 available per day. That is almost exactly $1k saved per year at the low limit. Makes sense. But we are also efficient on heat pump - for cooling and heating - saving heating bills in winter. And we cook on electric and heat water electric - saving on the gas costs. So displaced costs are