Because my utility has no guarantee that I will only charge during off-peak times, so I will have to pay the regular electricity rate.
Originally Posted by scottf200
In order to qualify for an off-peak rate, the load must be controlled by the utility. This is done with a load control receiver like this
It contains three relays, one 30 A 240 V relay that is already used for the water heater, and two 5 A 30 V relays that can be used for low voltage control such as A/C etc.
As I mentioned, the Clipper Creek CS model of EVSE's have two control inputs. You ground one of them through an external relay and it will shut off the contactor in the EVSE. You ground the other one, and it will change the control pilot signal to allow the car to draw only 1.4 kW.
Since the Voltec EVSE has two inputs that are labelled as "load shedding control connections" in the rather sparse documentation that is available, I am hoping that it works in the same way, but I need some confirmation / documentation.
The only other alternative is to install another contactor between the circuit breaker and the EVSE, but this duplicates functionality that already appears to be in the EVSE, cost more money, and takes up more space in the LCR and CT box. If the EVSE has the capability of low voltage control, I want to use it.
Last edited by J in MN; 02-21-2011 at 01:49 PM.
VIN 2291 picked up in MI on 2011-04-04