Costs
Summary
Major Component Costs
- battery kWh
- $3000 - 18kW/h (based on $160 per 1kW/h)
- inverter kW
- $500 - 3 kW
- interval meter
- $1000 ($300?)
- Computer
- $200
For comparison a 3000VA UPS, which basically does the same thing
are arond $2500 (cdw UPS). This price doesn't seem to cover the batteries.
This may be under sized. An average house uses 30-50kWh per day (depending on location, size ...). But our offer does not need to power the house for a whole day.
Details
Costs Areas
- hardware
- installation
- interval meter
- insurance
- maintenance
- Power loss (estimate 20%)
- management servers
- capital depreciation
- it looks like batteries can be expect to last 10+ years depending on type.
- Purchased power
Hardware
- Computer (with connectivity)
- Inverter
- Storage - Batteries
- Charge Level Meter
Sizing
Battery kWh
What drives the storage capacity?
- Commitments to home owner?
- Available space?
- Ability to sell stored capacity at peak time (inverter price not linear with rating)
I think we want to have the maximum battery capacity for the largest inverter / interval meter we can buy to generate power for the 6 hour peak period.
Inverter kW
- Sizing for customer's house requirements?
- Stored Power / Duration of peak price (pg&e 6 hours)
- 110v or 220v?
- efficiency
36 kWh / 6 hours => 6 kW
Inverter prices appear to be non linear with size.
Interval Meter
- PG&E approval
- peak kWs
- resolution?
Typically hard to find, corporate crap around this stuff
Prices
Batteries
- Battery Wholesale
- 3kWh $489.00
- Toms Hardware
- 1.8kw/h $470.00
Inverter
- TheInverterStore.com
- 3 kW - 240v, $500
Interval Meter
- PG&E
- $1000 - $38,000
- Energy Matters
- Australian single phase interval meter - $AU300
Notes
kWh = volts * Ah / 1000
Power Storage Technologies
- Capacitors
- -- cost (very expensive)
- ++ cycles / life time
- -- capcity (till ultra capacitors exist)
- ++ charge/dischate rate
- Batteries
- + cost
- - cycles/life time (10+ years...)
- + ok charge/discharge rate
- Flywheel
- + great cycles/life time
- + great charge/discharge rate
- - cost
- Compressed Air
- + cost
- + cycles/lifetime (based on fridge)
- - charge/discharge rate