Electric car charger design and manufacture done by Government agencies.

[volker@muehlhaus]

discussing technical ideas toward 3kw EV chargers

What charging times to you consider useful?
Affordable wall box chargers are usually 22kW @ 3 phase.

 

[treez]

Anyway, lets keep it technical…..the initial units would not be potted, because potting is what private co’s do to stop rivals from robbing their ideas….potting can cause problems with potting compound (especially in the prescence of vibration) ripping components off the board or stressing them mechanically……also, potting compound stops the government sponsored repair centre engineers from easily finding out which part of a circuit went wrong……and we need to know which part of the circuit went wrong…because then we can tweak it better…so the chargers get better and better……then all participant government sponsored companies can be fed the info…….private co’s would just pot the electronics in a (too small) metal case and when the unit fails…tough it goes for scrap.
The government sponsored units would use fans and heatsinks for cooling….but venting (and vent filters) would be special so that moisture and dust did not get in too much.
The correct fans will be used…for long life……….not the fans that use cheap grease which wears out quickly and renders the fan inoperable (the private sector would use these though) ….and when the fan eventually dies……..this will be sensed, and the unit returned to the government repair centre, and the fans replaced, and the unit sent back out…..not scrapping the entire unit because the fan had failed.
Hall sensors will be used to detect fan speed is correct…no private company would bother investing in this…but because multiple government sponsored companies would be all using the same fan speed sensor, they would buy in bulk together and thus get them cheap…..small private companies acting alone will simply not be able to get such volume price reductions….so the small private companies will give up and just end up importing vast amounts of middle-manned units in from overseas…and loads of scrap electronics will result…but the middle-men will be millionaires overnight.

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What charging times to you consider useful?

Most people will just like a 3kw charger which can put 150 miles in overnight..thats enough to get to work.

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Affordable wall box chargers are usually 22kW @ 3 phase.

Yes, people would probably drive to a charging centre to use those, since as you know, no-one has domestic three phase...(apart from Betwixt)

 

[volker@muehlhaus]

Yes, people would probably drive to a charging centre to use those, since as you know, no-one has domestic three phase...

Ooops. 3 phase is standard over here for many decades. The small 22kW wall boxes (less than $1000) are for home use, the charging centers are getting equipped with faster DC chargers.

 

[treez]

Thanks, thats amazing..Germany has 3-phase to all domestic households, since many decades?

 

[volker@muehlhaus]

Thanks, thats amazing..Germany has 3-phase to all domestic households, since many decades?

I'm not sure for every single domestic household. In our region, houses from 1960s already have 3-phase supply from the very beginning.