Tesla Motors Club
I own a Prius, aka a back-up generator 
I've been wondering whether a PowerWall does not simplify the design of an off-grid, PV based, passivHaus spec'd home. The specifics of how often the generator is used depends on location and home demand, but I would appreciate advice and comments regarding the design and operation of an integrated energy system for a home of this type.
As an example of such a home:
Average 6 kWh a day electricity including hot water and AC, not including any *EV
PV capacity set to 30% over average daily consumption
300 'sunshine days' a year
Two 7kWh PowerWalls, to supply 2-3 days of moderated demand
The Prius can output 6-10 kW DC by tapping the high voltage battery output.
I imagine the schematic to look something like this:
Reasonable ?
Any functional aspects I am overlooking (e.g., overcharging protection, energy flow etc) ?
Why use a Prius, you ask ?
205V, 30 Amp DC output
Quiet
Pollution controlled
Perhaps higher efficiency than competing generators
I have one
I've been wondering whether a PowerWall does not simplify the design of an off-grid, PV based, passivHaus spec'd home. The specifics of how often the generator is used depends on location and home demand, but I would appreciate advice and comments regarding the design and operation of an integrated energy system for a home of this type.
As an example of such a home:
Average 6 kWh a day electricity including hot water and AC, not including any *EV
PV capacity set to 30% over average daily consumption
300 'sunshine days' a year
Two 7kWh PowerWalls, to supply 2-3 days of moderated demand
The Prius can output 6-10 kW DC by tapping the high voltage battery output.
I imagine the schematic to look something like this:
Reasonable ?
Any functional aspects I am overlooking (e.g., overcharging protection, energy flow etc) ?
Why use a Prius, you ask ?
205V, 30 Amp DC output
Quiet
Pollution controlled
Perhaps higher efficiency than competing generators
I have one