jonatron/napkin_maths.md

## napkin_maths.md

      
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    Napkin Maths on Electricity at £0.52 per kWh

Ofgem
(1 April - 30 September 2022)
£0.28 per kWh
(1 October - 31 December 2022)
£0.52 per kWh
Is running a diesel generator cheaper?

Red Diesel Prices
Approx £1.06/litre
Diesel Generator Fuel consumption PDF
Full load
10kW / 12kVA   4l/hr         0.4   l/kWh  0.4*1.06 = £0.42/kWh
20kW / 25kVA   6l/hr         0.3   l/kWh  0.3*1.06 = £0.32/kWh
120kW / 150kVA   32l/hr      0.266 l/kWh  0.266*1.06 = £0.28/kWh

Hawaii

Hawaii uses diesel / fuel oil for electricity generation
Hawaii.gov PDF
Fuel Oil Used by Utility Companies
Cost of Oil/KWH Generated
$0.201 = £0.17
Diesel Oil Used by Utility Companies
$0.181 = £0.15
Car charging

Tesla model 3 at 52p/kWh
Cost per mile: 11.3p
zap-map.com
evcarshop.com
Car with 51 MPG
Cost per mile: 17p
fleetnews.co.uk
The cost per mile would be equal at approximately £0.80/kWh
Solar

A 5kWp System: old.reddit.com
May generate more than 25kWh / day or less than 1kWh / day, depending on the time of year and weather. Likely to generate the least when you need it the most.
https://nitter.pussthecat.org/Edent_Solar/status/1530278252564160513#m
https://nitter.pussthecat.org/pic/orig/media%2FFTyj9fGWUAEp6mP.png
https://nitter.pussthecat.org/Edent_Solar/status/1479847895725662213#m
https://nitter.pussthecat.org/pic/orig/media%2FFIl50YjXwAYogU3.png