Source: pulse width modulated heating 1 MW peak charging rate refrigerant cooling This brings EV charging into the 5 minute range. So long Tesla lead. Bob Wilson
It is good that there is international competition to innovate. I doubt many megawatt chargers will be used for individual vehicles, but these are needed for trucks and other heavy vehicles. Costs will be much higher than the 250kw-350kw stations currently being built. Still what is the US government pushing right now? The president just signed an executive order pushing coal and encouraging coal companies to pollute more. The government will likely cut the incentives to build the nation wide charging network. I wonder if there will be over 100% tarrif on these things if byd exports them to the US.
A Tesla charging station with four, 250 kW stalls, has a maximum draw of 1 MW from the grid (and battery buffer). The typical Tesla EV charging profile is a triangle from a high peak, 250 kW to 2 kW in an hour. So several scenarios could occur: Single EV - starts at 1 MW but within 15 minutes, down to 2 kW and drive off. Second EV arrives - split the charge with 2/3 to first and 1/3 to second. As fhe first car completes it charge, it drives off giving the second car full rate Third EV arrives - split the charge with 1/2 to first, 1/3 to second, and 1/6 to third Fourth EV arrives - split the charge with 1/2 to first, 1/4 to second, and 1/8 to third and fourth As cars leave or their charge rate tapers off, the new excess is shared down the list. The total grid load remains 1 MW but it is skewed to fast charge the first with lower rates going down by arrival order. The EV charge rate taper will minimize the time on charger of all all cars. There are alternate load sharing schedules and each needs modeling. If I get bored, I'll work up an optimal, load sharing, math model. The basic rule is each charging stall has the ability to provide the maximum grid power to an EV but as the number of EVs arrive, the earliest ones get the largest draw as they will be taper down fastest. The remaining charge capacity then moves to the later cars and this maintaining the constant draw on the grid and shortest charging periods for each car. Bob Wilson
A credit card reader at every charging stall. Better still, just read the VIN with a challenge-response verification and then use a card-less payment system. Still give reduced rates to 'return' customers. Bob Wilson
over at bolt.org, they eschew credit cards. they want to pull up and charge. the chargers should all recognize the cars, and you get the bill through the app. credit card readers are subject to fraud and reliability problems.
But I use an old flip phone and will not pay extra for an unlimited data plan. So apps won't work for me. Well, at least I used to use an old flip phone up until recently. But I still don't like using apps.
I tend not to worry about the payment system because pretty much everyone has a 1-800 number with either a keypad or human to work out the payment. Tesla cars and Superchargers are VIN based, easy. Non-Tesla EVs and Superchargers are App based. As for the other chargers, they have less reliable RFID cards, credit card readers, Apps, and 1-800 numbers. As NACS is adopted, I expect VIN-like interfaces will eventually become more common. But my CCS-1 EV (BMW i3-REx) carries its own engine-generator and maintains 70 mph with them. At a maximum charge rate of 50 kW, any EV-only cross country trip would be impractical. Bob Wilson
I agree but you shouldn't need an app. You should only need a card member agreement to charge when it sees your vin. There should be controls in the car to set charge limits. All doable without requireing people to have smart phones. One of the biggest markets for evs should probably be retirees who often don't have the latest tech like some on this forum have.
i'd like to see the stats on that. i'm fine if they can develop a charging structure that works without an app, but i thought i was the last driving senior to get a smart phone
That would require a protocol for exchanging information and time to implement. And OTA updates for all possible cars. Ideally you sign up once and never need a cell phone to just plug in and charge. But fear of the complexities is a significant barrier for the demographic you are suggesting. For example, many have moved to retirement communities which have zero charging stations and no ability to even connect to a 120V plug in the garage lest the resulting fire destroy adjacent car or even the building. Investigated that. Can't even take advantage of a PHEV.
ChargePoint works without an app. When I first got my PIP my work got several ChargePoint chargers. I signed up online and got a RFID card, that still works today. When I use it at work, the fee is $0 for the first 4 hrs. When I use it at a regular ChargePoint I get charged whatever the rate is. I have to have a credit card on file which can be done via website of phone call. I do have the phone app, but the RFID card in my wallet is easier and faster to tap. Mike
