HUD is off center and charging rate

I can't comment on the charging time ( I have only one ), but you can easily adjust the position of the HUD via Settings>HUD menu

cheers

Kris

 

The HUD is simply too far to the left - by a tiny amount (I'd estimate about 5mm). I've gotten used to it and, apparently, I either sit slightly to the left or place my head slightly to the left, because I no longer notice it.

The Prime only has two charge rates due to the car - 8A and 16A, when on 240V. If it's at another charge rate, it's the EVSE that's doing it.

 

same here.

 

If you are left handed it is just fine.

 

same issue here. After 5 weeks I have gotten used to it. I also find I look at the HUD less and less over time.

 

The car's on-board charger communicates with with the charging station; that's part of the SAE J1772 protocol. The Prime should tell the Level 2 EVSE charging station to limit the charging rate to a max of 16 amps regardless of the max capacity of the charging station. If you'd care to contact Blink support or Siemens about this difference in rate, we'd be interested in the response.
Blink - Contact Us

VersiCharge Contact Form - Power Distribution - Siemens

 

Yes the HUD is clipped on the right. I think the problem is that the cutout in the top of the dash is not wide enough. If the cutout was a half inch wider on the right I think it would be fine.

 

So, would it show the full 16 A incoming current on a ScanGauge? Or would something like a battery fan (while also charging) limit the ScanGauge reading to less than 16?

 

I have no idea what ScanGauge does, but actual measured currents are around 15A or just a little more.

 

VersiCharge has 0 to 4 charge settings in which 2 is the 50% (15A, 3.6kW). Would this be the reason that it is 20% slower than Blink EVSE?

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My guess is the charge rate difference is the difference between running on 240V and 208V.

 

On mine there is no problem of image clipping. The aperture is wide enough but maybe on some cars the projection angle needs physically adjusting.

If it were me, I'd ask for this to be fixed under warranty.

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I have a hypothesis as to why ScanGuage says only 8 to 9 amps, whereas the current should be 16 A.

So, the car is being charged from a 240 V outlet (let's call it 220 V) at 16 A. So, basic physics for the power output along a resistor in a steady state DC circuit is given by P = VI. Plugging in the numbers:

P = (220 V)(16 A)
P = 3520 W.

But the internal battery is 351.5 V (let's round off to 350 V). If we first assume that all of the energy from the charging port is converted into the battery with no losses, then conservation of energy requires that the current be different. Solving for I gives

I = P/V
I = (3520 W) / (350 V)
I = 10 A

But there are some energetic losses, since the transfer process is not totally 100% efficient. So, let's assume that the process is only 85% efficient.

I_eff = P/V (0.85)
I_eff = (3520 W) / (350 V) * (0.85)
I = 8.5 A

and this is consistent with the 8 to 9 amps (magnitude) of the ScanGauge display. Since the current is drawn to the battery, which is at 350 V, not at the 220 V supply of the charger, ScanGauge measures the current that would be carried at the voltage of the battery (not the charger) to capture the same energy... well, same except due to not perfectly efficient transfer.


And, therefore... if you are using a household 110 V outlet at 12 A, again assuming 85% transfer, then ScanGauge should give a current reading in magnitude of 3.2 A.

Personally, I find that pretty measly, since if I want to get up to speed on the highway, I've seen my Prime draw 200 A from the battery when I floor it.

 

Ok here are my calculations.

If the charging rate were only 9 amps then it would take around three hours to charge from empty on an L2 charger at 240v. Assuming no losses.

But it takes more like 2 hours.

Again without losses, if we assume 6kwh actual total charge into the battery from empty to full in round numbers, that's an average of 12.5 amps over the charging period, for 2 hours.

Given the slower charging that happens as the battery approaches full, that means that the peak charging rate reaching the battery must exceed that 12.5 amps.

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Sorry, I am wrong. I am working at 240v and you are working at battery voltages.

9A at 350 v is still a fair bit of power though, over 3kw.

But 200A at 350v, that is 70kw! That is a serious amount of power. Even for a short period of time!

If my calculations are correct, the 6kwh approx full charge would only last for about 5 minutes at that rate!