I don't know why you keep focusing on range. It barely matters. Km driven each day matters. Extra potential range does make it heavier which should reduce efficiency but it may also allow for extra regen (more cells to dump power in to) so it may not be a huge difference overall. If you come home with your Hummer and have driven 700 km that day and want to drive 700 km tomorrow, you are correct, level 2 is not a good fit. Very very very few people follow that usage profile.
The issue is human behaviour mixed in with engineering. Not everyone is a top-up charging person (and most of the counter arguments here seem to assume they are) and less will be in the future if you cannot top-up over night. Sadly the future product needs to be engineered for bottom-up people (battery low cycling)....
We are also just touching on one aspect here, a technical problem, home charging has other very serious problems for full EV adoption not in this post but covered before, like it or not.
Higher storage capacity batteries need more energy to get from a zero/low to a full charge (we are talking two to four times the energy storage in the next five to ten years) now mix in people.... Today, L2 gets from a pretty low charge to a full charge in one night or maybe two with some driving to work in between. Not a big engineering problem for battery life today, as the majority of people top-up the batteries, even if that is not their nature (mostly taken care of by the technology). Really, the average EV gets a full charge today at L2 in ~8 hours (some longer, some shorter), same charge rate but four times the battery capacity in the very near future that is now 32 hours+ to fully charge from low on L2 as it is today (L1 like numbers for time).... Again, larger capacity batteries require more energy to charge from low to full (I hope no one argues against this). Larger vehicles require more energy to move and will absolutely take advantage of better tech to get higher density batteries with more energy storage. Longer range requires more energy storage....please read on, lets talk about people.
If all owners are "good" owners with these future batteries/vehicles and L2 charge (at today's L2 standards) each night to keep it "fully" topped up, NP, drive 200km plug in each night to cover yesterday's usage back to full charge, even at future battery densities, density does not matter in this corner case. Long drive with a good owner and four times the battery capacity, top-up at L3 (L4) charge station or leave it a couple of days (30+ hours) at home on L2 to get charged up, return to the drive and top-up cycle. But that is not human nature for everyone so a good portion will let it get down low to very low (long drive, more likely just lazy and did not plug it in) and will bottom up each night and the new higher density batteries will spend most of its life at low charge levels, might even skip nights as there is enough already for the next day and... had to pee when they got home.... This low cycling MUST be included in the future engineering of the vehicle or the behaviour modified, it creates big cost problems! Happening today with L1. Not a problem with L2 today as it can charge the battery in ~8 hours.
Their mindset, L2 gets me enough charge for back and forth to work the next day so no worries, just do that. Bottom-up owner charges low charge bigger battery L2 each night, might skip some (again future not today's EVs) and gets the battery to enough charge for back and forth to work the next day but the battery stays/cycles at lower charge levels for extended periods of time which then causes the manufacturer problems with battery life ($$$$s). As everyone keeps saying here, L2 gets them back and forth to work,
YES, absolutely, no argument here, even in the future, but that is the one of the problems when it becomes not enough to get the battery from low to a proper charge before the next drive but enough to do just what you need and the users just keep putting just enough in to cover their needs the next day.
Just enough to cover the next day's needs is sadly human nature for many, maybe most people. L2 works perfectly today for these people as it gets us from 0 to full in ~one night solving a lot of the engineering problem they may cause, but I am not talking about today. The cost to engineer the future vehicles needs to consider all this. Just like people driving around with their ICE at near empty to 1/4 tank $5 or $10 at a time.
How do we solve future low cycling, bottom-uppers, lots of possible solutions, some listed here: 100 amp++ home charging to get more energy in less time to get back to an ~overnight full charge-that is a problem for the grid and it will push many homes to >200 amp services (and the vehicle manufactures are already talking about requiring this soon BTW), larger heavier charging cables and wiring, oops multiple EVs needing a 100 amp charge in the home....etc. Next possible, SW that will interfere to protect the battery and make sure the bottom-up owner gets it fully charged based on a cycle or other measure (SW to change user behaviour), lots of problems here (SW says vehicle won't drive today as you need to get it to 80% plus because you have been 30% or less for three weeks, maybe L2 not allowed if below 30% charge, IDK except mostly bad for users....). Maybe tracking to tell the owner that battery warranty will be cancelled based on how they are low cycling/charging as L2 is not getting them to full charge (likely legal issues). Extra engineering costs to design this all in, battery over capacity or much higher quality to consider shorter lifespan in this case (which can create a feedback loop on the issue BTW and $$$$s). Or... government mandates to make the vehicles use less energy (CAFEv2 for EVs) and therefore less storage capacity requirements, less local grid load.....
OR take the Apple/MAC approach and remove the floppy drive instead of fixing the OS but blame it on progress, need to fast charge at the station not at home, it is the future. Home charging is no longer needed as there are enough for pay charging stations. Bang, just saved a bunch of $$$s per car eliminating L2! More money for manufactures and multiple lobbyist groups are very happy.
But again all this human nature and physics is not the only problem with home charging when it comes to full EV adoption.
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