Utility Costs: Difference between revisions
Jump to navigation
Jump to search
| Line 9: | Line 9: | ||
=Transcending the System - Calculations= | =Transcending the System - Calculations= | ||
*20kW PV - raw cost of $7k, down to $5.8k in bulk. | *20kW PV - raw cost of $7k, down to $5.8k in bulk. | ||
* | *Water from 59F to 110F (15 to 44) - 30C rise. For 250 gallons. | ||
*Industry standards - 80 gal heater - 21 gal recovery rate per hour with 9kW. [https://www.lowes.com/pd/American-Water-Heater-Company-80-Gallon-Tall-3-year-Limited-4500-Watt-Double-Element-Electric-Water-Heater/1000213693] | |||
*Max gallons recovered with 18 kW electric - 42 gal/hr - or 250 gallons per day. | |||
*Perhaps the large 80 gal heater is the way to go as a basic, off-the-shelf unit running on solar. Keep it on only during the hottest sun time. | |||
Revision as of 16:40, 19 November 2020
Between $141 and $266 for lowest to highest states per month for gas and electric. See nice map at [1]
This means that in the design of the Seed Eco-Home, we put in the extra effort to make electrical costs less over lifetime. We can also strive to make those costs 0 up front via energy loans.
Basics of high PV profile - use 20kW.
Invest in concrete pipe (it leaks [2]) for water storage when sealed and insulated.
Transcending the System - Calculations
- 20kW PV - raw cost of $7k, down to $5.8k in bulk.
- Water from 59F to 110F (15 to 44) - 30C rise. For 250 gallons.
- Industry standards - 80 gal heater - 21 gal recovery rate per hour with 9kW. [3]
- Max gallons recovered with 18 kW electric - 42 gal/hr - or 250 gallons per day.
- Perhaps the large 80 gal heater is the way to go as a basic, off-the-shelf unit running on solar. Keep it on only during the hottest sun time.