Test charging stop for large EV’s, busses, trucks, mohos.

Reisender wrote:

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.

Does the output voltage of the battery drop as the state of charge drops? If it does, will the inverter still power the charger?
OT, but to show how I learn. Years back a driver left truck lights on overnight. When I found out next morning, I called him, told him to take day off. I rolled out my big charger, and 200 feet of 16 gauge cord. Worked all day, very little charge in batteries. Decided batteries where ruined, and loaded them in pickup. Gave driver another day off. Next morning I hooked up the charger with it plugged into the shop wall. When we stopped at noon, the meter on charger showed full charge. Batteries lasted rest of year. (Driver didn't)

time2roll wrote:

JRscooby wrote:

time2roll wrote:
While the en-route charging shown in the video is great.... The real benefit will be having the charging station at the destination loading dock to charge where the truck is already stopped to unload. Especially for fleet vehicles such as grocery stores. Will increase the incentive to get solar up on the store roof too.

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.

Yes however the cables would have to be immense and the batteries would charge/discharge faster than optimum for long life. Still best to have a controlled charging cycle at the correct maximum. Using the existing down time of the truck in effect takes no extra time. If the truck makes nine 20 minute stops in the day to unload that is three hours of charging and no time lost in the schedule.

Yes, pulling the cables out to hook up would be a strain. That is why I mentioned bars. On a straight truck it would be fairly easy to after the dock ramp is placed, a pair of bars swing to contact. Semi would need to make contact at trailer/dock and tractor/trailer.
Most times when a truck is making many stops in a day don't dock just use liftgate. But at grocery warehouse for example, often the trailer stays at dock all night to be loaded. When it leaves to make deliveries, OTR trucks back in to unload (The last time I delivered to a grocery warehouse it was against company policy for outside drivers to us restroom or spend the rest of sleeper time on property. Think they would charge OTR trucks?

Gjac wrote:

I like your battery idea if something would be able to top off the batteries but I think it would be more practical to just change out the batteries when they get low then the EV station would charge them over night until the next truck or MH needs one. Quick change over the time it takes to fill a 100 gal diesel tank.

Changing batteries might work, but what I was thinking (use thinking loosely) was while the truck is out making deliveries or bus bussing thru the day solar is charging stationary batteries. Then at night, power is transferred to vehicle.