The Retractables are Coming!

Sunday, July 31, 2011
Updated: 9/24/11
Cord Management...it's the Achilles heel of EV Charging.

In the US, our EV Charging Level 2 spec (NEC Article 625) currently calls for a permanently attached charging cable to the charging station if it's intended for outside usage.  These cables can be long (25 ft), heavy, and stiff in the winter, so they can pose these problems...
  • Not properly stored - some people won't put the cable back after they use it, making it harder for the next person to use it
  • Cables get dirty after being dragged around on the ground
  • Cables can get abused, run over, snowed over, or even stolen
There are two basic ways of automatically solving this problem: wireless charging or some way of retracting the cable after use...I call them the Retractables!  Out of the 40 EVSE vendors that I know about, here are vendors making a retractable solution...

Control Module Industries
CMI is an innovative company that has a freestanding and overhead mounted EVSE with a retractable cable.  When activated by a remote switch, the cable lowers down to an ADA height and allows the user to pull the cable where they want it.  When you're done, it slowly retracts the cord back into it's housing.  I like the overhead version, as it's compact and looks easy/cheap to install.
  • Retraction method benefits: Cable never hits ground.  Cable is protected from theft while stored.
Coulomb
Coulomb just debuted a new retractable Level 2 EVSE, model CT2025, that uses a retraction system similar gas pumps...which is a spring-loaded rope holding up the center of the cable (see picture).  In addition to keeping the cable off the ground, this charging station also has several other nice features, including: place for a EV Sign, charges two cars at Level 2, looks easy to install, and has a light!  How is that for well designed?
  • Retraction method benefits: Cable never hits ground.  Supports two charging cables.  Simple.
General Electric
GE's cool looking WattStation (more here) has an interesting retraction system, but no ship date yet.  I'm very intersted to see how well this system works especially given how stiff these cables can be in the winter...or prone to kinks in the summer.  Another challenge for the design is storing two cables for a dual Level 2 charger.
  • Retraction method benefits: Protects cable from theft while stored.
ParkPod
Parkpod has a nice looking EVSE that looks like Apple designed it.  Parkpod's retraction system combines a springy coiled charging cable and spring-loaded rope holding up the cable.  Together, they ensure the cable never hits the ground.
  • Retraction method benefits: Cable never hits ground.  Simple. 
Erg-Go
Erg-Go is brand new to the EVSE scene and they are currently taking orders on their first production run.  This EVSE is the first one outside of Clipper Creek that has a charge current above 30A...as it will charge at 75A, making it a better fit for customers with fleets (of Tesla's :-) that want a faster charge.
  • Retraction method benefits: Protects cable from theft while stored.
DBT USA
DBT has been installing EV Charging stations around Paris since 1995...and now they have a complete line of EVSE for the US market.  The SXB unit pictured right is a dual 240/32A unit.
  • Retraction method benefits: Protects cable from theft while stored.

    2 comments:

  • Greg

    In our area the older charging station have had there cables CUT and stolen (copper prices). The standard need to change to allow for a socket and a way to secure ii on bot the car and the station.

  • Fleur Eudocia

    They should've thought of that beforehand. Anyway, it'll be nice if all the charging stations will have retractable cables. And while I'm at it, I hope there will be affordable EV camper vans too for us who loves going on an outdoor trip.