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Free Destination Charging: 50x L2 80A Stations @ Caltech, Pasadena, CA

Discussion in 'Supercharging & Charging Infrastructure' started by MITE46, Nov 26, 2015.

  1. CDragon

    CDragon Member

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    Are you controlling a HPWC with its RS-485 interface here? We're trying to figure that out in this thread so we can ramp the HPWC up and down in response to amount of power solar panels are outputting. Can you help?
     
  2. MITE46

    MITE46 Member

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    yes over rs-485, raspberry pi + USB RS485 adapter works well for residential single HPWC control
     
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  3. Dave Davies

    Dave Davies Member

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  4. CDragon

    CDragon Member

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    Great to hear we're on the right track! I posted a potential process for reverse-engineering the RS485 protocol here. If you're willing to share any protocol details or at least let me know if my process will work, I'd appreciate it.
     
  5. MITE46

    MITE46 Member

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    Switching pilots while charging
    IMG_3328.JPG

    Testbed in our office
    IMG_3336.JPG
     
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  6. CDragon

    CDragon Member

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    What do you mean by "Switching pilots"?

    P.S. I could use your expertise on the rs485 protocol thread. Wish I had your testbed!
     
  7. PlayaVista

    PlayaVista Member

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    Friendly reminder to all users to please keep the area clean. Have seen too much trash there. :(

    There was also a black Tesla Model S a few nights ago blocking CHAdeMO charger for many hours and prevented at least two other cars from charging - let 's be good positive community members!
     
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  8. Cosmacelf

    Cosmacelf Well-Known Member

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    The pilot is a signal that tells the car what current to draw. Normall an EVSE sends a fixed, unchanging pilot signal that reflects the capacity of the electrical line, but in this case, with dynamic load management, the EVSE can change the pilot signal and thus tell the car to charge at different currents at different times.
     
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  9. MITE46

    MITE46 Member

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    Quick update...we've developed a mobile app for user input @ Caltech...It includes predictive charge curve

    PF_predective_charge_curve.PNG PF_charge_curve.PNG

    Depending on your urgency and dynamic pricing, you can see how we plan to deliver that energy before departure time.

    We are delivering over 3000 EV miles a day now, which I guess enough to cross the country. We will be adding addition Level 2 stations this month.
     
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  10. AMPd

    AMPd Active Member

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    I’m gonna have to stop by to see this amazing future!
     
  11. CDragon

    CDragon Member

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    The address is 1248 E. California Blvd., Pasadena, CA 91125 but it's confusing because there is no parking structure visible. Instead, chargers are in underground parking below a sportsball field. Drive onto a road with tennis courts on the left and a big grassy field on the right. I'm not sure what the road is called because Google Maps gives it no name.
    Parking structure entrance is at GPS 34.134075, -118.126355

    It's a cool place.

    The L2 chargers on the left have LCD screens you can use to pick your car from a list that seems to include every EV ever made. All the other chargers make you pick your car from a phone app. Once it knows your car and battery size, you can tell it when you want to leave and it will charge your car when it makes the most sense, trying to minimize power draw for all connected chargers and I guess maybe even shoot for when electricity is more cheap? Not sure about the last one (maybe it says earlier in this thread).

    There is one big L3 charger (50kW?) with CHAdeMO and CCS cables for when you need a fast charge. However, since there's only one, there can be contention.
     
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  12. Galve2000

    Galve2000 Member

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    That does sound really cool!
     
  13. AMPd

    AMPd Active Member

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    I wish every parking garage had such a sophisticated set up.
     
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  14. BrokerDon

    BrokerDon Active Member

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    Have to check it out the next time we're getting our growlers filled at Stone Company Store - Pasadena: 220 S Raymond Ave #103, Pasadena, CA 91105. Typically I plug into one of the free L2 chargers in the parking garage under Stone Brewing but the L2 charge rate is really slow (max 19 mph)... but would love to see this high tech fast charger array set up. :cool:
     
  15. chuck-h

    chuck-h Member

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    Harking back to the electrical distribution discussion around #61 Free Destination Charging: 50x L2 80A Stations @ Caltech, Pasadena, CA and #86 Free Destination Charging: 50x L2 80A Stations @ Caltech, Pasadena, CA

    We're looking at putting in a managed multiple-charger installation at an outdoor condo parking lot and it seems to pencil in to use a "feeder/tap" arrangement rather than home runs from each station to a big breaker box. Logic says that because of the way load management works you'll get more efficient use of copper. So we are considering a big bus running thru a series of small breaker boxes as shown below. This might be sensible for garage installations as well.

    TapBreakerBox-1.png
     
  16. MITE46

    MITE46 Member

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    One of our newest sites...(26) L2 + (1) L3 + (3) HPWC...fully load managed...cameras for parking occupancy detection and auto vehicle identification. More sites coming VERY soon.

    LAHS HPWC deployment.jpg
     
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  17. CameronB

    CameronB Member

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    Where is this site?
     
  18. icanmakeit

    icanmakeit Member

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    +1
    For location
     
  19. MITE46

    MITE46 Member

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    los altos
     
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  20. Dave EV

    Dave EV Active Member

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