davewill wrote:If you can program at all, you could probably program in a Bell curve of charging rates to roughly match your generation curve.
It appears OP has a 2012 LEAF. As such, the maximum power draw from the wall is on the order of 3.6kW. In addition, the battery can only accept so much charge before it is full, depending on the SOC at the beginning of the day. With a 40-mile RT commute, maybe 10 kWh available each day is a ballpark figure. (But if you are commuting each day, likely the car is not even available for this purpose?) Without the ability to DISCHARGE the LEAF battery back into the grid at nighttime, the LEAF can only provide a limited amount of
With my 12.5 kW system, peak AC production is around 10 kW with the house using about 2 kW (except on hot days like today when it likely consumes around 6 kW), our 2011 LEAF would not be able to make up the power difference. And the meter can frequently roll back about 50 kWh on a "good solar day", so the LEAF would not be able to address that level of storage on those days. Taken further, we net meter over about 3 MWh (peak meter reduction) through the course of a year. Battery storage is not likely to provide for that kind of seasonal energy shifting anytime soon.
The point is that a dedicated storage solution may be better suited for the task of keeping as much of the power in-house as possible. Again, whether or not it would be cost effective is another story.
In the long run, we will need to try to move EV charging to daytime hours to match the PV peak that will occur in more-and-more locations and to simultaneously reduce the nighttime load.