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

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.

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.

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.

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.

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.

valhalla360 wrote:

PartyOf Five wrote:
While I don't question any of the numbers above, I also don't question the business sense of these & so many other companies - if its not going to work, they're not going to invest $1 into it. Success (according to the masses at least) goes to those who make the most money, and the ones who lead this race are generally the ones who can think beyond the box.

With wind, solar, and other power forms becoming popular, it could be reasonable that that coal plant has fewer customers, or that it's customers need less power - enabling more charging stations at the truck stop.

From Wikipedia: In 2019 there were 241 coal powered units across the United States which generated 23% of the United States electricity in 2019, an amount of electricity similar to that from renewable energy or nuclear power... Installed capacity was about 236 GW.
So if you have 5 coal plants per state today, then each serves a couple hundred miles- is there a need for 14 truck stops within each one's service region?

If it was the businesses leading, I would agree.
The problem is this is the politicians driving the process and using our tax dollars to allow them to ignore the financials. If the govt throws a few billion at it, industry happily will put together a program to test running trucks on unicorn farts.

Coal plants are being taken off line. We are actually entering a period where excess production capacity is steadily going down.

I wasn't proposing to build coal power plants but just using that to explain the scale of what these chargers need in terms of power supply. You could use in nuclear, hydro or solar the charging stations as equivalents, doesn't matter but we are talking huge concentrated demands. A couple acres of solar panels aren't going to be even close to enough to service an individual truck stop. And more importantly, the existing power plants are already being used for other purposes. For every 14 truck stops as described, you are going to have to build the generation capability of an average power plant.
.

This OUR TAX dolars fud always cracks me up,
Our taxes arent nowhere near enough to pay for any large expenditures.

Fed simply prints trilions more $$ to keep the show going,

https://youtu.be/mgMp3p44J7Y

Horsedoc wrote:
Not one answer to the questions that should be on everyone's mind..
How long to charge a heavy duty truck?
What does it cost?
If this place saves on petro chemical fuels, where does the energy come from that generates the power to do the charging?

Some people use sunshine,solar panels,not sure how much that cost,but probably cheaper then fosil fuels otherwise they wouldnt drive Evs.

valhalla360 wrote:

JRscooby wrote:

Fact is coal fired plants have been going off line for years because natural gas plants run cheaper and cleaner

Chicken and egg...coal plants are more expensive because the govt rules that have long since lost the purpose of reducing emissions and have gone punitive to eliminate coal plants.

I have not seen much evidence of the "punitive", but if the plant operator of the first coal powered plant had been forced to pay for all the clean-up there would never been a second.
In the early '70s I lived downwind from a plant.

Have a look at the research around the Remora on board carbon dioxide capture system for long haul trucks. It is possible to scrub diesel exhaust without a whole new infrastructure. See also Sweden - diesel submarine -

Those of us who have been around combustion engines for many moons know a person doesn't own too many engines - we are owned by too many batteries.

JRscooby wrote:

Fact is coal fired plants have been going off line for years because natural gas plants run cheaper and cleaner

Chicken and egg...coal plants are more expensive because the govt rules that have long since lost the purpose of reducing emissions and have gone punitive to eliminate coal plants.

Horsedoc wrote:

If this place saves on petro chemical fuels, where does the energy come from that generates the power to do the charging?

Typically it comes from petro chemical fuels!