DENZA Opens New Chapter For EV Charging From DC WallBox
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:
In our report from the Auto China show, we pointed out that DENZA’s wallbox is huge and a little pricey, but let’s take a closer look.
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.
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.
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?