Stark mobile charger is out !

[Theo]

Cells like Molicel P50B have a fast charge rate of 5 C so they can be charged at 25 A and would take 12 min to fill up at this rate (obviously a bit longer in reality).
That would be 5,5 kW on standard 220 V.

Actually, if you recharge, at 25 A, some series of P50B let's say made up of 100 cells each, it will be done at a voltage that will be roughly 360 V and that will rise during the charge, so the calculation isn't 25 A • 220 V = 5.5 kw; it's 25 A • 360 V = 9 kw and if you wanted to use a 220 V input current for the charger, it would be 25 C • 360 / 220 = 41 A. All this, of course, assuming a 100% efficiency.

How about you ride down the street twice, plug it in at full 6,6 and tell us what happens.

Let's even say that he discharges the battery at 80 % (I don't know at which percentage a 6.6 kw charge would start to be reduced when getting close to 100%), consider that the charger is rated at 3.3 kw in the specification sheet downloadable at Stark's site, so he could even theoretically use an adapter and connect that charger to a charging station but he would't get more than that. After all, they would never allow a Shucko plug to pass more than 3.5 kw and I believe that it already gets 3.5 kw and roughly 0.2 kw are lost in inefficiency.

 

[Beagle]

yeah thats the new portable charger of 3.3, but should be another big one for "home charging" of 6.6kw, thats what the CEO said... no info yet but the APP is now showing the 6.6 option thats why im confused

Surely that would "home charging" only if you already have your own EV charger setup at home, right?

 

[Erwin P]

Actually, if you recharge, at 25 A, some series of P50B let's say made up of 100 cells each, it will be done at a voltage that will be roughly 360 V and that will rise during the charge, so the calculation isn't 25 A • 220 V = 5.5 kw; it's 25 A • 360 V = 9 kw and if you wanted to use a 220 V input current for the charger, it would be 25 C • 360 / 220 = 41 A. All this, of course, assuming a 100% efficiency.


Let's even say that he discharges the battery at 80 % (I don't know at which percentage a 6.6 kw charge would start to be reduced when getting close to 100%), consider that the charger is rated at 3.3 kw in the specification sheet downloadable at Stark's site, so he could even theoretically use an adapter and connect that charger to a charging station but he would't get more than that. After all, they would never allow a Shucko plug to pass more than 3.5 kw and I believe that it already gets 3.5 kw and roughly 0.2 kw are lost in inefficiency.

But he could just try to plug it in and see what happens, worst case the safety in his house ''falls''. Then you actually know it uses more power than normal.

 

[Karinshi]

Surely that would "home charging" only if you already have your own EV charger setup at home, right?

What I mean is that Stark is supposedly going to release a charger identical to the one that comes with the bike but with 6.6kWh. I'm not an expert so I don't know if it's possible to plug a 6.6kW charger into a conventional wall socket or if an installation for that power is needed.

 

[OpaTsupa]

Houses in Europe and in the USA are not configured to output 6.6kW / ≈29A.
It can be done, but it requires investment in wiring, adapters, sockets and an electrician. Quick search for what EV cars use shows the range of 500-1000$.
Probably another 1-2000$ for the Stark turbo-charger.

@szczur333, explained it above with more expertise.

Leaving aside the need of such fast charging and long term impact on the battery ... This hypothetical charger would firmly be in the nice to have category, and I can't see how it will ever sell and to whom.

Only scenario is racing and racing teams, but how will they draw that much power in the field? [imagine an EV category of 10-20 bikes in MX]

 

[Beagle]

Indeed, a fast charger would be interesting if it's onboard a street bike so you can connect to the existing charging infrastructure, can't see what the point would be for MX/EX?