I'm going to guess that like Ford, Chevy will require dealers who want to sell Bolts have to install public facing chargers. Ford requires 2 (one in service, one with public access). IF they get the dealers to play ball. They can get a dealers to buy $1000+ tools to work on something a few times that for a charger should be doable as a customer amenity? I've never been turned down for a charge at any Ford and have even stopped at a few Nissans. Everyone's been nice, but I have seen stories of people getting turned away if they didn't buy it there.
Really the only network they have to build is the hardest part of between towns, then figure maintenance, etc.
I believe the Fusion Energi only has a 7.6 KWh battery and the cheapest Model S has a 70 KWh. A low power charger is OK for a small battery, but larger batteries need high current DC chargers or you're going to sit there for 12 hours or more.
Tesla is focusing on building chargers between towns. Most superchargers are easily accessible from main highways and most are placed outside of cities, California being the main exception. Somebody is going to have to build something similar for other BEVs.
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Or the other way around. Charger networks will develop with more EVs on the road. 'All' carmakers are coming with Evs now. And they will share the same plug, chademo or combo, so its easier for third party companies to deliver their charging solutions for a large marked.
But if you look at the battery production situation, all those new BEVs are going to be low production vehicles. LG Chem and other suppliers are supplying parts for 30,000 Bolts a year. Estimates are that LG Chem might be able to stretch production to supply 52,000 Bolts a year, but that would max out their production capacity and leave no spare capacity for anyone else.
There will be more brands of BEVs on the road in a few years, but except for Tesla, not significantly more total vehicles.
CHAdeMO is the standard for Japanese EVs and I think the Koreans have adopted it too. The North American and European auto makers have agreed on CCS. However both CHAdeMO and CCS are standards for plugs and delivery protocol and have no standard delivery power. Though there are theoretical maximum power delivery levels in the spec, very few stations in the real world deliver anywhere near the maximum. They are adequate for today's small battery PHEVs and BEVs, but they will become a burden for large battery BEVs that are coming.
The mistake most car makers are making is expecting somebody else to build a high power charging network. In some cases they are asking governments to do it, but that's not going to happen in most of the US. It may happen in some European countries, but it probably won't happen in all. Most car makers are hoping some entrepreneur(s) will build a high speed charging network with their plug standard, but right now there is no money in it and there won't be money in it until there are a lot of long range BEVs on the road and people aren't going to buy long range BEVs in numbers if there charging network isn't there. Somebody has to do what Tesla did and build a high speed charging network at a loss to get things started.
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I'm very doubtful that there's a profitable business in 3rd party EV charging unless the government or a consortium of automakers provided serious subsidies. Most charging is done at home, so if there's going to be widespread distribution of chargers, I don't see how they will be utilized enough to pay for their installation.
This is true now, but won't be the case as BEVs become more common. Less than 1/2 the US population has the ability to charge a car at home. Some people own homes, but have no garage and no driveway, some have old houses with wiring that is too ancient to add a charger, many people rent and few rental houses are going to have EV charging for a long time, other people live in condos or apartments. Many condos have parking garages or parking lots and most suburban apartment complexes have parking lots, but a lot of apartment dwellers have to park on the street.
At some point there is going to have to be a major effort to install chargers in residential areas where people don't have the ability to charge at home. It's going to be a major expense and part of it will have to be public money.