I just installed a KWh meter for charging my Clarity PHEV. The meter cost $58 plus shipping or $79.99 with free shipping from Amazon. I had to make a quick trip to pick up a part so once I completed the installation I plugged in my charger until it was complete. At that point the meter read 1.61 KWh and a couple of hours later it still read 1.61. The numbers on the meter are very small and I wish I had installed it at eye level so I didn't have to bend over to read it. I make a lot of short trips and don't plan on having the engine start for months at a time. This meter gives me the chance to measure miles/KWh and then cost/mile. I don't know how to get a picture you can click on, so I included the whole thing. In case you can't read the small print on the meter, its an EKM-15E. It only works with 120 Volts but it supports up to 50 Amps.