miimura
Well-Known Member
@DrGene what you're proposing may be technically more efficient, but has a couple downsides.
1. You're proposing special equipment that is not commercialized, so would be expensive, at least to start with.
2. If the car and the solar are dependent on each other, what happens when you need to drive the car somewhere?
There are several benefits to the way the current Powerwall system is designed.
A. Any brand and type of solar grid-tied inverter can be used.
B. The system is ready to go at all times and can either offset household use while on grid or power the house when the grid is down.
C. The Powerwall system is completely self contained with battery and inverter with only the Gateway box as other special equipment. Everything else in the installation is commercial electrical equipment like breakers and breaker panels.
During a prolonged outage, you can charge the car without charging from the Powerwall batteries with double AC-DC conversion losses - you can charge from the AC power generated by your solar before it even goes into the Powerwall. Sure, a DC-DC converter from solar might be slightly more efficient, but if you already have the on-board charger in the car and you already have the solar inverter for grid-tied usage, there is no additional equipment necessary. I feel like your proposal is a solution looking for a problem that doesn't really exist.
1. You're proposing special equipment that is not commercialized, so would be expensive, at least to start with.
2. If the car and the solar are dependent on each other, what happens when you need to drive the car somewhere?
There are several benefits to the way the current Powerwall system is designed.
A. Any brand and type of solar grid-tied inverter can be used.
B. The system is ready to go at all times and can either offset household use while on grid or power the house when the grid is down.
C. The Powerwall system is completely self contained with battery and inverter with only the Gateway box as other special equipment. Everything else in the installation is commercial electrical equipment like breakers and breaker panels.
During a prolonged outage, you can charge the car without charging from the Powerwall batteries with double AC-DC conversion losses - you can charge from the AC power generated by your solar before it even goes into the Powerwall. Sure, a DC-DC converter from solar might be slightly more efficient, but if you already have the on-board charger in the car and you already have the solar inverter for grid-tied usage, there is no additional equipment necessary. I feel like your proposal is a solution looking for a problem that doesn't really exist.