I am an electrical engineer with over 10 years of hardware R+D experience, who has wired a home addition, replaced a main electrical panel and built several dozen computers for myself, friends and family. So why did I pay SPX to install a Level 2 charger?
Despite the above background I was wary of the potential risks of connecting a $40k computer and high energy battery to a high energy circuit. The lowest of several estimates by licensed electricians to install a new dedicated branch circuit to an appropriate enclosed NEMA socket at the desired location was $330.
At the time, the best price I could find for 15-20 AMP Level 2 chargers was of the order of $500 and the best price I could find for a 30-40 AMP Level 2 charger was of the order of $1000. Those chargers each came with a one year parts warranty. The higher power charger would do nothing for my Volt but might be useful for my next EV.
After I qualified for the Coulomb Technologies free equipment program, SPX sent their electrician for a site survey and then provided an estimate of $1300. After I called SPX and explained that I had obtained estimates considerably below that, they came back with an estimate of $800 to install a free CT-500 capable of delivering 32 AMPS. That price included a three year equipment and labor warranty.
So my options were, in order of increasing personal preference:
1) self-install a 15-20 AMP charger with a one year warranty at total cost ~ $500
2) self-install a 30-40 AMP charger with a one year warranty at total cost ~$1000
3) have a local electrician install a 15-20 AMP charger with a one year warranty at a total cost of ~ $830
4) have a local electrician install a 30-40 AMP charger with a one year warranty at a total cost of ~ $1330
5) have SPX install a CT-500 with a three year parts and labor warranty at a total cost of $800
It is unfortunate that other SPX customers have reported on this site various negative experiences in their dealings with that company but I am happy to report that my dealings with them went very smoothly.
Additional value received from the CT-500 includes access to http://www.mychargepoint.net/ where I can download a variety of usage reports and can locate public charge stations registered with that network. I am also mindful that my usage data will be combined with that of others for the purpose of advancing the grid-to-EV interface.