3 ms·

Aren't EVs just big batteries? What's so hard doing 2, and then using them to stabilize the grid, now that they support bidirectional?

dahfizz 4y ago
I don't know of any technical reason why #2 is hard. Its just a matter of getting the power company to do it and setting up incentives so that EV owners will use it.
- frumper 4y ago
  My electric company had me install a separate meter for my EV charger to manage time of use. Benefit is that only my EV costs more in the day, downside was the cost and time to have it done.
- kkfx 4y ago
  It's hard because those who design EV, PV etc do not own them, do not understand them. They simply execute some order "do so", ignorantly. That's why only few weeks ago we have seen an initial standard for biderectional DC support. That's why there is still NO PV inverter who actually output 400V DC for stationary batteries who happen to be the same in EVs avoiding wasting 25-30% of energy in useless multiple transformation. That's the issue of private led initiatives: public research propose visionary solution, implement them, give them to the public with some standard concepts. The private sector then pick and implement. Like we do now, anyone try to offload research costs to customers, push their own standards and nothing really work.
clintonb 4y ago
Not all EVs, or homes, support vehicle-to-grid (V2G).
- kkfx 4y ago
  Essentially NO EV actually on sale support V2G, very few support very limited V2L in monodirectional fashion (or you charge, at a CONSTANT power or you discharge with limited power)... And that's a VERY good example of the fact EVs designers have no clue on what they are doing: modern domestic storage is 400V like most EVs batteries, there is no damn reason to avoid a direct MPPT (DC) link between PV inverters and cars nor no damn reason to mandate charging at constant amperage. It's simply the lack of PUBLIC research who also produce PUBLIC standards...
ZeroGravitas 4y ago
You don't need bi-directionality to stabilize the grid, just modulating the charging that was going to happen anyway is far easier and more impactful.

dahfizz 4y ago

I don't know of any technical reason why #2 is hard. Its just a matter of getting the power company to do it and setting up incentives so that EV owners will use it.

frumper 4y ago
My electric company had me install a separate meter for my EV charger to manage time of use. Benefit is that only my EV costs more in the day, downside was the cost and time to have it done.
kkfx 4y ago
It's hard because those who design EV, PV etc do not own them, do not understand them. They simply execute some order "do so", ignorantly. That's why only few weeks ago we have seen an initial standard for biderectional DC support. That's why there is still NO PV inverter who actually output 400V DC for stationary batteries who happen to be the same in EVs avoiding wasting 25-30% of energy in useless multiple transformation. That's the issue of private led initiatives: public research propose visionary solution, implement them, give them to the public with some standard concepts. The private sector then pick and implement. Like we do now, anyone try to offload research costs to customers, push their own standards and nothing really work.

clintonb 4y ago

Not all EVs, or homes, support vehicle-to-grid (V2G).

kkfx 4y ago
Essentially NO EV actually on sale support V2G, very few support very limited V2L in monodirectional fashion (or you charge, at a CONSTANT power or you discharge with limited power)... And that's a VERY good example of the fact EVs designers have no clue on what they are doing: modern domestic storage is 400V like most EVs batteries, there is no damn reason to avoid a direct MPPT (DC) link between PV inverters and cars nor no damn reason to mandate charging at constant amperage. It's simply the lack of PUBLIC research who also produce PUBLIC standards...

ZeroGravitas 4y ago

You don't need bi-directionality to stabilize the grid, just modulating the charging that was going to happen anyway is far easier and more impactful.