NRMA press release on the opening,
www.mynrma.com.au
Great news - but it'd be nice if there was actual info about the site provided. e.g. speed. I would also say, cost, app, etc. but assume it's the same as their other ones for now (free, hopefully not much longer).NRMA press release on the opening,
The NRMA launches its 100th EV charger
The NRMA has today opened a new fast electric vehicle charger in Mudgee which is the first as part of the Driving the Nation Fund, and is the 100th charger in the NRMA’s expanding network of regional chargers.
Plugshare entry from NRMA indicates it is still a free site. Press release says 360kW across the site, so two 180kW ABB chargers, which means around 70kW for 400V cars due to ABB 200A per cable limit.
Would you believe I was lazy and just went Ctrl-F and searched for 'kW' ... missed the 'kilowatts'!
I may have oversimplified. The standard RWD model 3/Y have a nominal 360V battery voltage which is fairly consistent over its SOC levels though will be lower at really low SOC levels. For the long and performance version of the model 3/Y the nominal battery voltage at 100% SOC is around 400V. The voltage at lower states of charge for these performance and long range cars are considerable lower, at 20% SOC it might be somewhere like 335V which will probably see a lower kW charge at lower SOC and actually peak higher at a later SOC for these 200A limited chargers. We still seem to talk about these cars both being 400V cars. That why I did a bit of a hand waving and said 70kW for 400V cars from my often Tesla centric point of view. For BYD I am less sure what there nominal battery voltage but I think its nominal battery voltage is probably closer to 400V and, with its LFP battery, would have closer to this kind of voltage at lower SOC and at its peak charging SOC for a 200A cable hence why it might see 89kW.
teslamotorsclub.com
teslamotorsclub.com
www.barossa.sa.gov.au
michaelwest.com.au
But 400V chargers have a charging V of 400V nominal irrespective of the pack voltage. Only the charging current is variable
That article seems to have little to do with this network.
No, the charging voltage has to match the instantaneous pack voltage (unless there's a DC-DC converter involved on the car side, as in the Ioniq 5 when charging on a 400V charger).
How would that work.
The car requests the voltage from the charger to charge at. It will request a voltage over what the instantaneous pack voltage is but not too much higher. This will ultimately affect the current, and hence power that the car then charges at. When we talk about 400V cars there pack voltages are not all the same level for even the same chemistry for the same nominal cell voltage. For instance the Model3/Y has 109 LFP cells in series whereas the BYD Atto has on the order of 126 LFP cells in series. These battery packs will require a different output voltage from the charger for the same power.
Funnily enough, I just happened to see this article: Behind the scenes: Deciding on NRMA's national network locations
There is a small one of course, but it only needs a small voltage difference for a large current to flow, because the battery pack has very low impedance.
V=IR
Resistance is not fixed. And charging current does not stay the same - the charging rate actually reduces as SoC increases
In this context P=VI is a more suitable equation. For the same Power 800V architecture cars require half the current vs 400V cars. Also, as pack voltage increases, power increases for the same current (if charger is maxed out). Chargers will be generally current limited for Teslas.
