Test charging stop for large EV’s, busses, trucks, mohos.
Another step forward for charging infrastructure. There is also a short video. https://electrek.co/2021/04/21/daimler-electric-truck-charging-station/
Forum Discussion
JRscooby wrote:Reisender wrote:JRscooby wrote:
I will say I know nothing about EVs other than I like the idea. That said many times in my life I have seen a battery that was fully charged hooked to a mostly discharged one with large cables and in a very short time the voltage in the discharged battery make a big jump up.
Now to go into theory, or really show my ignorance. Would it be possible to build a stationary battery bank, with say twice the capacity of the battery of the EV, and such that the fully charged voltage was 10% higher than full charge on EV? Then let solar panels on the roof charge that battery. The EV, pulls in with a low battery. Large cables, or better buss bars, join the batteries. Kick in a relay, wouldn't that charge the EV to full charge in a short time? If the EV was to set overnight, the cables could be smaller, charge slower.
I’m sure it would work but it would be an inefficient use of 50 percent of the capacity of the storage battery. This is why they use inverters and rectifiers at V3 Superchargers so they can more efficiently utilize the capacity of the on site storage. The on site storage allows for a much smaller grid feed to the Supercharger as it acts as a peaker during peak charge hours. Friday nights, Sunday mornings, long weekends, etc.
I can't say you are wrong, and for sure can't say I'm right.
But can the inverter discharge battery below 50%? The reason I say double is to so there would be enough amps to hold the voltage above max charge voltage of the EV battery. The reason I say use large cables is to speed the transfer.
If the battery bank was large enough a inverter could power other loads. But for lighting, be better to make the lamps to use stored voltage. Every time you transform you lose some.
Scooby I am no expert. But for example the cars battery can be routinely run down to almost zero with no issues. TESLA I believe recommends daily operation between 20 and 90 percent but also adds that running between 100 and very low percentage is fine. So yes, you can draw the battery down to pretty much zero.
