[oilerlord]

Free charging can be a benefit, as long as you’re able to take advantage of it…

You mean, like this?

I did say I'd probably never do a DC charge, but hey... It's free so I figured I'd try it out.
The charger is only 50kw, and I was getting 35kw when I plugged it in at 35%

 

[FelineFreddie]

There are only 4 EvGo charger units/posts within 40 miles of my home, all at separate locations, and all 50 kW units.

In my particular case, not much of an enticement in itself to buy the vehicle…

 

[jmwk]

There are only 4 EvGo charger units/posts within 40 miles of my home, all at separate locations, and all 50 kW units.

In my particular case, not much of an enticement in itself to buy the vehicle…

I've found those old 50kW chargers really sketchy. More fails than successes.

 

[JSM]

I guess I'm a bit luckier in that sense. I have an EVGo charging station 2 miles from home, with (4) 350kW stalls, (8) connectors that can charge simultaneously. The bad side of that is it appears all the Uber bz4x drivers that regularly travel into NYC are charging there! It's funny when they pull up and start asking questions and griping at the same time.

 

[JSM]

Latest charging event, 2024 bz4x xle awd, started at 27% state of charge, max charging speed 88kW.

 

[oilerlord]

^ 50kW free DC charging station.

Memo to dude in the Mach-E who made me wait 30 minutes while your car charged from 92% to 100%...

Not cool.

 

[JSM]

Today's charging session, 2024 bz4x xle awd; starting at 17% state of charge. Max charging speed noted was 97 kW. Ambient temp 65 deg.

Note that 17 to 80% was longer than Toyota advertised time of 35 minutes 10 to 80%. Also, highest inverter coolant temp was seen at the 80% mark.

 

[n6nl]

Ambient may have been 65, but the battery started at 75. That helps a lot.

 

[oilerlord]

Free fuel is such an amazing, and intoxicating benefit.

I'm only saving like six bucks at the DC charger near me, and at times wait an hour for that six bucks...But it feels great!

At 33-35 kW, how much long term damage to the battery am I doing vs ONLY charging at home at 3.8 kW?

 

[jake14mw]

Free fuel is such an amazing, and intoxicating benefit.

I'm only saving like six bucks at the DC charger near me, and at times wait an hour for that six bucks...But it feels great!

At 33-35 kW, how much long term damage to the battery am I doing vs ONLY charging at home at 3.8 kW?

Yeah, I can't imagine charging at 33-35 kw can be doing any damage, but I would have never guessed they would have to limit charging sessions in a day either, so I can't say I understand their design. I think you're fine charging the way you are. I used to search out EVGo stations that were a little out of my way too, I love a bargain, but then figured out it just wasn't worth it to me.

 

[FelineFreddie]

As long as you’re staying below the 80% capacity of the battery, I really doubt there’s any negative impact to the traction battery whatsoever.

Enjoy the free juice!

 

[oilerlord]

Yeah, I only DC charge to a max of 80%. I don't like making people wait for this charger longer than they need too, and the charge drops significantly (to about 20 kW) so I might as well just top it off at home if I want.

At home, I'm comfortable charging to 90% since "100%" because there's already a large built in buffer in the battery. Quick math suggests a 90% charge equates to 57.6 kWh - is about 79%.

 

[n6nl]

When set to stop at a 90% charge, OBD II usually reports 86.67%. There’s both a top and a bottom buffer outside the 0-100% indicated. There’s also some small usable buffer below 0% indicated before the vehicle slows and then stops moving.

A 100% charge usually is reported by OBD II as 95.29%.

This is the CATL pack on a US 2023 AWD (actually, a Solterra, but unlikely to be different on the bZ4X).

 

[JSM]

When set to stop at a 90% charge, OBD II usually reports 86.67%. There’s both a top and a bottom buffer outside the 0-100% indicated. There’s also some small usable buffer below 0% indicated before the vehicle slows and then stops moving.

A 100% charge usually is reported by OBD II as 95.29%.

This is the CATL pack on a US 2023 AWD (actually, a Solterra, but unlikely to be different on the bZ4X).

That is absolutely true as I've see that buffer t throughout the entire charge curve.

 

[oilerlord]

I read somewhere there is only 64 kWh usable in this 72.8 kWh battery. If it is 64 kWh I just subtracted 10% (or 6.4 kWh) in the calculation. Either this assumption was wrong or my math is.

 

[jmwk]

I read somewhere there is only 64 kWh usable in this 72.8 kWh battery. If it is 64 kWh I just subtracted 10% (or 6.4 kWh) in the calculation. Either this assumption was wrong or my math is.

On my Solterra (CATL battery), 100% on the dash is 95.6% on the OBD and 0% on the dash (yeah, I've been there) is 8.6% on the OBD. I've driven a few miles below 0%, but I've not gone so far as to a dead stop. Someone else (I hope) can find that data point!

Dash% to OBD% is a straight line conversion with a great statistical match, and they cross over around 61%.

 

[oilerlord]

On my Solterra (CATL battery), 100% on the dash is 95.6% on the OBD and 0% on the dash (yeah, I've been there) is 8.6% on the OBD. I've driven a few miles below 0%, but I've not gone so far as to a dead stop. Someone else (I hope) can find that data point!

Dash% to OBD% is a straight line conversion with a great statistical match, and they cross over around 61%.

So a "100%"charge is what actual battery capacity as reported by carscanner?

 

[jmwk]

So a "100%"charge is what actual battery capacity as reported by carscanner?

95.6% on the obd scanner.

 

[n6nl]

That’s why you can just charge to 100% and not worry about battery life.

But I will say that above about 90%, re-gen is restricted, which means that efficiency in that last 10% is slightly poorer, which I have seen in my collected data.

If your route means that 100% charge is helpful (reserve, allowance for unforeseen circumstances, etc.), just charge to it “100%” (via L1 or L2) and go on with your life.

 

[oilerlord]

95.6% on the obd scanner.

I guess what I'm looking for is how many kWh's the usable capacity is. 95.6% implies that the usable capacity of the 72.8 kWh battery is 69.6 kWh's.

Is that correct? I thought it was about 64 kWh's.