Coffee_Slurry
Well-known member
I had a chance to talk to SDG&E about the EVSE installations that are part of EV Project, and learned some important things.
First, a second utility meter is still required, as they have said before.
The same EV Project (subcontracted) electrician that installs the EVSE will also install a breaker/lock-out box, and a socket to accept a new meter. These will be "surface mount" and near our existing rate meter.
The electrician will bill EV Project for the EVSE installation, and also bill SDG&E for the portion of the labor & materials required for the new meter. SDG&E is picking up the tab for these (not from EV/ARRA funds).
Once the socket, breaker, and EVSE are installed, the City will inspect it first, and then SDG&E will inspect it next. SDG&E will energize the socket, install the new secondary meter, and seal it. For EV Project participants, there is no installation or monthly charge for the additional rate meter.
The new meter will be on the randomly-assigned experimental EV-TOU rate plan, and billed separately from the primary residential meter.
The EVSE meter is "downstream" of the main meter, connected in series, so the billing for the residence involves subtractive math. (They are not in parallel, and the total service amps remains the same.)
There is no way to net out the EVSE usage by PV generation on the primary meter, since they are billed separately.
As an aside, the rate plan that will replace the available-to-anyone EV-TOU-3 will be published in Q1 2011. This is unrelated to the EV Project folks, except that it's the likely plan we will end using after the experimental rates.
First, a second utility meter is still required, as they have said before.
The same EV Project (subcontracted) electrician that installs the EVSE will also install a breaker/lock-out box, and a socket to accept a new meter. These will be "surface mount" and near our existing rate meter.
The electrician will bill EV Project for the EVSE installation, and also bill SDG&E for the portion of the labor & materials required for the new meter. SDG&E is picking up the tab for these (not from EV/ARRA funds).
Once the socket, breaker, and EVSE are installed, the City will inspect it first, and then SDG&E will inspect it next. SDG&E will energize the socket, install the new secondary meter, and seal it. For EV Project participants, there is no installation or monthly charge for the additional rate meter.
The new meter will be on the randomly-assigned experimental EV-TOU rate plan, and billed separately from the primary residential meter.
The EVSE meter is "downstream" of the main meter, connected in series, so the billing for the residence involves subtractive math. (They are not in parallel, and the total service amps remains the same.)
There is no way to net out the EVSE usage by PV generation on the primary meter, since they are billed separately.
As an aside, the rate plan that will replace the available-to-anyone EV-TOU-3 will be published in Q1 2011. This is unrelated to the EV Project folks, except that it's the likely plan we will end using after the experimental rates.