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No because AC EVSE don't convert to DC electricity at all, their output is AC. The car's on-board charger does all the converting (rectifying) of AC to DC. It's possible to build or buy a low powered DC charger--for example, lots of Harley-Davidson dealers have a 25 kW CCS DC charging station--but you're never going to get there by adding up AC EVSEs. A quick search online shows such 25 kW DCFC stations to run you in the range of $10k-$15k.Would it be possible to take two AC EVSEs and combine their output into one DC stream of up to 23 kW ?
You are right, I should have been thinking of two 48 Amp OBC (on-board chargers)No because AC EVSE don't convert to DC electricity at all, their output is AC. The car's on-board charger does all the converting (rectifying) of AC to DC. It's possible to build or buy a low powered DC charger--for example, lots of Harley-Davidson dealers have a 25 kW CCS DC charging station--but you're never going to get there by adding up AC EVSEs. A quick search online shows such 25 kW DCFC stations to run you in the range of $10k-$15k.
What would be the market for this charger?
Any and every place you e.g. want to spend 1 - 2 hours and gain 100 to 200 miles of range.What would be the market for this charger?
Hopefully higher power chargers can turn into a profit center for some restaurants in some locations.I'd like to see 50 to 100 kw chargers at interstate restaurants like Cracker-barrel. Tesla Urban Superchargers are an excellent example.
You don't need 250kw because it'll be done before you are and you'd have to move the car, but you need a lot more than 11kw. 45 minutes of dining on a 72kw Supercharger would be pretty perfect for a road trip.
I don't know what is usual, or the range of costs if an upgrade is needed.I suspect that one reason ~20kW charging isn't practical is that it usually requires a service upgrade
Especially with all these cars with large 100kWh batteries and 48A chargers. There are some CCS options in the ~25kW range but they cost ~$10k. I bet Tesla could do a 30kW L3 charger for $5k. I'd be all over that. Have the ability to split it between two pedestals. So even if you're sharing you'd be charging faster than 48A L2.
It could even be 208v three phase. He will need to tell us.I don't know what is usual, or the range of costs if an upgrade is needed.
Referring again to nwdiver's projects in SE New Mexico, he is installing a 230 Amp line at one of the McD properties he has gained permission to install charging. I presume that is 240v so it is 55 kW, but if it is a 120v feed that is still 27 kW.
His other project included an upgrade that was installed for under $4k
- Current S/X is 16.5kw (100 amp circuit)
- Current 3/Y is 11 kw (60 amp circuit)
It could even be 208v three phase. He will need to tell us.
So, refreshing my on-board charger my knowledge,
- Pre 2016 MS could have a 22kw charger (dual I think)
- Current S/X is 16.5kw (100 amp circuit)
- Current 3/Y is 11 kw (60 amp circuit)
Installing low power DC charging may be kinda pricey for the functionality.
I think there's niche between 11.4kW and 70kW. It could help bridge some of the ~250 mile gaps. Places that people often find themselves not quite being able to make their destination or the next supercharger. Or this could free you from the tyranny of SC locations. Instead of going to a SC go have dinner where you want for an hour and pick up ~120 miles of range...
30kW of grid-tied solar PV inverter costs ~$5k. 30kW of EV charger should cost less. If Tesla took advantage of the existing supply chain and packaged 3 48A chargers I can't image the unit cost would be >$3k. Maybe retail it for ~$5k. I was looking at some of the quotes for L2 public chargers. They average around $20k. Most of that is labor. So for a ~25% increase in cost you could get a 300% increase in charge speed.
They already have the 72 kw Urban Supercharger, and 11.5 kW wall charger, so you really are looking for a Goldilocks.
They still have a lot of open area to fill in with regular super chargers as more and more people own Tesla vehicles everyday and the CyberTruck and Semi coming down the road.
ABB makes a 25kW DC charger in the Euro market