DENZA Opens New Chapter For EV Charging From DC WallBox

7 months ago by Mark Kane 6

Denza DC charging

DENZA DC charging

Yes, Clearly We Are In China With These Charging Protocols

Yes, The Trip To Beijing for Auto China 2014 Paid Off As We Can Now Make Use Of This Shot Of The Charging Protocols On The DENZA!

Two months ago, Shenzhen BYD Daimler New Technology announced the selection of ABB as supplier of DC fast chargers for DENZA electric cars.

What’s unique is that ABB’s task is to provide not only public DC fast chargers with power of 50 kW to recharge the DENZA EV’s 47.5 kWh battery pack in less than one hour, but also DC wallboxes.

To date, no one offers DC wallboxes. Typically, EV car owners could buy AC terminals with power of several kWs, sometimes up to 20-22 kW. But all of them were AC units (1-phase or 3-phase in Europe), which means that the car itself had to have an on-board charger capable of charging at such levels of power.

DENZA’s case is different. There is a 1-phase on-board charger with power of just 3.3 kW and without the option of higher power like 6.6 kW or 10 kW. This means that the charging times via Chinese GB/T AC standard (on the right) will be very long for such a big battery pack:

Denza AC charging

DENZA AC charging

Yes, So The ABB 22 kW Wall Box At $3,200 Is Both A Little Pricey...And A Touch Large

Yes, So The ABB 22 kW Wall Box At $3,200 Is Both A Little Pricey…And A Touch Large

In our report from the Auto China show, we pointed out that DENZA’s wallbox is huge and a littleĀ pricey, but let’s take a closer look.

BDNT added to DENZA a second charging inlet -Ā Chinese GB/T DC standard (on the left), which probably will be the main inlet for charging despite it needing the optional DC wallbox.

DENZA offer two ABB wallbox – 7 kW (on some graphics there are 10 kW) for charging in 7 hours at 10,000 RMB ($1,600) and 22 kW for charging in less than 3 hours at 20,000 RMB ($3,200). Probably there are some additional costs to prepare the circuit for such high power at home, but Tesla owners use 20 kW with double on-board chargers, so there is no difference on this side.

Dual Charger price is listed by Tesla Motors at $1,500, but we must remember that this is an option to increase from 10 kW to almost 20 kW by adding another power module (not the price for the whole 20 kW). Tesla owners must additionally pay $1,200 for the Wall Connector. In such comparison the, DENZA’s solution is comparable if not cheaper.

Moreover, in the longer term, the DC wallbox with two plugs could serve two cars in one garage, when Tesla’s on-board charger is dedicated to just one forever. There is also the possibility to use it someday for vehicle-to-home systems.

Denza DC charging

Denza DC charging

If we compare the price of $1,600 or even $3,200, which is just 3% or 6% of the base price of DENZA before incentives, to prices of EVSEs, ABB’s wallbox price sounds reasonable.

The price of Bosch’s 7.2 kW Power Max units is $593, ($82/kW). ClipperCreek would like to charge $899 for latest HCS-60 11.5 kW model ($78/kW). But in both cases, EV owners must pay additional for on-board charger with higher power – in the LEAF increasing from 3.3 to 6.6 kW costs in U.S. $1,250. In some models or grades, 6.6 kW is standard, which just means that this price is included in the price of the car.

How about a small CHAdeMO or Combo wallbox with 10 kW or 20 kW for $1,600 or $3,200 instead of a 6.6 kW option and an EVSE for several hundreds of dollars?

A switch to low power on-board chargers and DC charging at home or at public quick charging stations could be the new chapter, not only in China, but perhaps eventually around the globe.

The last question remaining is would EV owners prefer DC over AC at home?

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6 responses to "DENZA Opens New Chapter For EV Charging From DC WallBox"

  1. Mark H says:

    A direct link to a residential solar array before passing through an AC inverter would be nice.

  2. scott franco says:

    The idea of DC charging via the existing DCFC port, at home for lower power is interesting and could work.

    Honestly though, I don’t see it as a game changer. My leaf charges within 1-3 hours and I rarely use it to turn the car around at home (arrive, charge and then drive off again).

    1. io says:

      Like you, I almost never need faster charging at home, so going DC would need to bring other benefits.

      I like Nissan’s take on this: use the car’s battery for backup power.
      http://www.nissan-global.com/EN/NEWS/2012/_STORY/120530-01-e.html

  3. Dwayne says:

    I am looking forward to the time when batteries are cheap enough that we can afford to have a large battery at home as well as in our car. That will facillate 200 Kw DC chargers at home.

    1. kdawg says:

      That’s what I was thinking. A battery at home that can trickle charge all day/night that is part of a smart grid and gives you the cheapest rates. Then when you plug in your car, you quick charge from DC to DC.

  4. Mike I says:

    “This means that the charging times via Chinese GB/T AC standard (on the right) will be very long for such a big battery pack”

    “BDNT added to DENZA a second charging inlet – Chinese GB/T DC standard (on the left), which probably will be the main inlet for charging despite it needing the optional DC wallbox.”

    I think the AC inlet on the right is a IEC Type-2 (Mennekes) inlet and the left is the GB/T DC inlet. The story text above is obviously conflicting.