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[theoutsider]

Has anyone had any experience with charging rates on the SR, SR/F or SR/S that had the Charge Tank option installed?

I have the the 6kw Charge Tank installed on my SR, so I theoretically have 9kw of charging capability. Most of the time I'm charging at 50-60% SOC. I have never seen the bike charging at more than 7kw, even at charging stations that are rated at 8-9kw.

I took it back to the dealer who uploaded the logs to Zero. Zero was saying that everything looked ok on the charger diagnostics. They said that the chargers can taper down the rate of charge at SOCs as low as 40%. They suggested I run the battery down to <10% SOC and see if the system charges at close to the full capability of the charging station.

It seems like a waste to have all that charging capability, but pretty much never be able to use it? I was hoping to be able to charge a lot faster, but according to this, the battery will never realistically charge at a high rate (at least for very long... 0-40% SOC?).

I'd be interested in hearing from anyone with 9kw or 12kw capabilities on their bikes.

[DonTom]

Has anyone had any experience with charging rates on the SR, SR/F or SR/S that had the Charge Tank option installed?

I have the the 6kw Charge Tank installed on my SR, so I theoretically have 9kw of charging capability. Most of the time I'm charging at 50-60% SOC. I have never seen the bike charging at more than 7kw, even at charging stations that are rated at 8-9kw.

I took it back to the dealer who uploaded the logs to Zero. Zero was saying that everything looked ok on the charger diagnostics. They said that the chargers can taper down the rate of charge at SOCs as low as 40%. They suggested I run the battery down to <10% SOC and see if the system charges at close to the full capability of the charging station.

It seems like a waste to have all that charging capability, but pretty much never be able to use it? I was hoping to be able to charge a lot faster, but according to this, the battery will never realistically charge at a high rate (at least for very long... 0-40% SOC?).

I'd be interested in hearing from anyone with 9kw or 12kw capabilities on their bikes.

Sounds pretty typical to me. The rating is for the highest you can get, doesn't mean you will always have that rate. Not is it only affected by SOC, but also by battery temp and other stuff.


BTW, I noticed on my Zero SR, if I try to charge it above 80% SOC, I will only get two KW charging with 8KW of chargers. But if I start the charge at below 60%, when it gets to the same 80% SOC it will charge at near the full 8 KW.  The BMS does a lot of weird stuff, but best to just let it do its thing and do not expect to get the full charge at all times.


It is best to start the charge at lower SOCs, when possible. I try to only recharge when below 50% SOC. But I do not have the charge tank, I have the power tank and use two external 3.3 KW chargers plus the OBC for 7.9KW charging.


I agree with what Zero told you. Just the way it is. The extra charger will be useful at times, but not always.


-Don-   Auburn, CA

[MVetter]

Has anyone had any experience with charging rates on the SR, SR/F or SR/S that had the Charge Tank option installed?

I have the the 6kw Charge Tank installed on my SR, so I theoretically have 9kw of charging capability. Most of the time I'm charging at 50-60% SOC. I have never seen the bike charging at more than 7kw, even at charging stations that are rated at 8-9kw.

I took it back to the dealer who uploaded the logs to Zero. Zero was saying that everything looked ok on the charger diagnostics. They said that the chargers can taper down the rate of charge at SOCs as low as 40%. They suggested I run the battery down to <10% SOC and see if the system charges at close to the full capability of the charging station.

It seems like a waste to have all that charging capability, but pretty much never be able to use it? I was hoping to be able to charge a lot faster, but according to this, the battery will never realistically charge at a high rate (at least for very long... 0-40% SOC?).

I'd be interested in hearing from anyone with 9kw or 12kw capabilities on their bikes.

What were the max rated outputs for the stations you were using?

[DonTom]

What were the max rated outputs for the stations you were using?

He said "even at charging stations that are rated at 8-9kw."


-Don-  Auburn, CA

[MVetter]

Yeah I wanna know the rated amps.

[DonTom]

Yeah I wanna know the rated amps.

That is what Ohm's law is for.


Assuming the usual 240 VAC:


8KW (8,000) divided by 240 VAC=33.33 amps.
9KW divided by 240 VAC=37.5 amps

-Don-  Auburn, CA

[MVetter]

Neat you went to the station and looked at the specs written on the side of the unit and reported back here


oh wait you didn't.

[DonTom]

Neat you went to the station and looked at the specs written on the side of the unit and reported back here


oh wait you didn't.

No, I didn't, but Outsider did. It's easy to convert watt capacity to current capacity when you know the voltage.


So is it Outsider or is it Ohm's law that you do not believe?



-Don-  Auburn, CA

[theoutsider]

The ratings were from Plugshare and verified by the little display on the charging stations (display was in kw). I've tested this on several stations already.

I was watching a video from HansHacks on YouTube. He has a 12kw setup on an older (2020?) SR/F...



He connected to a 22kw charger in Europe at 80% SOC and was able to draw over 11.6kw until it hit 90% SOC. Then it started throttling down.

This weekend I'll run the battery down and connect to one of the Volta stations close to my house that EV cars verify charge at >8 kw (you can see people's postings on PlugShare) and see if I can get close. The last time I charged at one of those stations I was barely getting 5.9 kw and was at ~60% SOC.

[DonTom]

Try to charge when it is not too hot. Not too hot from riding or from ambient temperature.


Last year I was stuck in Carson City, NV on my way home. Close to Reno, but I needed a charge then.


For many hours, I could not recharge my Zero at all. It was above 100°F.


Temp will affect your charge rate, even to the point to not allow ANY charge. And I know it can get quite hot there in Florida.


BTW, click on photo and see me charging my Zero DS here!


-Don-  Auburn, CA

[MVetter]

Rule 1 of diagnostics is to never make assumptions. Y'all just full of assumptions which means you'll likely be stuck scratching your heads for a while on this one.

[DonTom]

Rule 1 of diagnostics is to never make assumptions. Y'all just full of assumptions which means you'll likely be stuck scratching your heads for a while on this one.

Ohm's law is scientific fact, no assumptions are involved. None at all.


Unless you mean the voltage (240 VAC) could be off a little, but that is unlikely to be off far enough to make any significant difference. 240 VAC is the norm in the USA.


But perhaps in some areas 208 VAC industrial is more convenient to find. 38.5 amps instead of 33.33 amps in that case for your 8 KW. Big deal. BTW, I often charge on J-plugs where the machine itself, right on the screen says its max power is 7.4 KW and it also says I am drawing 7.8 KW and with no problems at all. Same machine telling me both at the same time.



-Don-  Auburn, CA

[MVetter]

Oh look! Variables!

[DonTom]

Oh look! Variables!

Yes, including what is in writing right on the machine itself. Same with what the display says. Often not nearly as accurate as Ohm's Law.  I have exceeded the claimed max capacity with no problem many times when I charge at 7.9 KW. And even the machine says I am drawing more than its max possible, and it just charges normally unless I go way over its stated max and only then it shuts off to protect the CB.


So if you're saying what is written on the machine itself (or shown right on the screen) is not always all that accurate, I agree.

[MVetter]

Bringing up Ohm's Law repeatedly, despite the fact that no one asked you to or disagreed with it in any way, is not helping your argument. I am good at diagnosing things. I eliminate variables, whenever possible, until the issue is found. Your willingness to accept potentially garbage data complicates the diagnostic process.

If you're going to keep hammering away at the idea that you have already locked down all the variables and you know better then I'm going to say, "fuck it" and recuse myself. You clearly know better. Figure out his problem I'm clearly just getting in your way. Peace out.