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[WrightWells]

Hi all

I keep seeing YouTube videos showing the use of the charge tank and the onboard charger used together.

But for the European/Uk users is there a defect in the Zero app as it looks like it calculates charging watts and charging amps with 110 volts?

[MVetter]

It's showing the charge rate as delivered to the bike. The bike operates between 95-116.4vdc.

[WrightWells]

Great thanks , when the charge tank arrives I can ignore the charge watts as I always think in Amps 

[DerKrawallkeks]

Yup you can think in Amps if you prefer, but the indication in Watts is likely correct. The app is using the DC voltage and DC current (which is after the charger into the battery). That happens to be around 110V, but has nothing to do with what you know as 110V AC like in the US.

[DonTom]

Great thanks , when the charge tank arrives I can ignore the charge watts as I always think in Amps 

I cannot see why. I wish they would never use amps. Amps is useless for showing charging power unless you know the voltage. That requires to know the voltage as well as to use some math.


Watts shows you the charging power regardless of voltage and amperage. That is all I want to know.


IOW, if I charge a 12KWH battery with a steady 12KW, it will take exactly one hour (not counting power lost in heat).


No way possible to do that when you only know the amps or only know the voltage.


What I think is especially stupid is how I am now charging up my Tesla that has a 12KW AC charger. I am charging it with a 48-amp Tesla Wall Connector.


I would rather see I am using my 12KW charger (in the Tesla) with my (approximately) 12KW Tesla Wall connector. No math required. Why do they charge with amps when they rate the charging in watts?


Watts is power. That is all I care about.


-Don-  Reno, NV

[WrightWells]

I see your points about watts.
But…
EVSEs are set in amps, the J1772 and type2 standard restrict the power based on the amperage capability of the cable.
The main fuse of the house and all calculations for diversity are based on amps,
It doesn’t matter what side of the pond you’re on.
In the Tesla, 10 A gives you 10 mph range, and 30 A, 30 mph range. Per hour
And Maths isn’t that hard.

[DonTom]

And Maths isn’t that hard.

But I would rather not have to do any math. Wouldn't you say it is easier to put a 6KW AC charger on an 8KW J-1772 instead of the same J-1772 but instead called as a  33.33 amp J-1772?


Yeah, you can still do the math. Sure,  amps makes sense for when the J-1772 is first being installed. The installer can do the math the one time instead of me every time I stop to charge up.


I use no pilot signal with my Zeros when I use external chargers so I like to know where my 7.9 KW external AC chargers on my Zeros will overload the J-1772 without doing the math to figure out that will be 32.916 amps on my Zero SR but  26.666 amps on my Zero DS external chargers that are 6.4 KW with the OBC.  If the J-1772 capacity is in watts to begin with there is no math to do and no numbers to remember.


-Don-  Reno, NV