My 2024 RX450h+ is on order and should be in my driveway around the end of the month. I've read through the manual and searched this 5th-Gen Hybrid tech forum, but can't find a clear answer as to what the "MAX" charging current actually is. There are multiple mentions in the manual of setting it to MAX, 16A, or 8A, but I find no definition of what "Max" actually is. The manual's occasionally random use of commas makes it hard to tell whether "MAX" and "16A" are the same value.

Or am I simply misreading this, and one can set the maximum charging current to 16A, 8A, or "the maximum that the source can supply but not more than 16A"?

Thanks in advance for any insights.

 

Max is definitely greater than 16 A - I know that from charging in public L2 chargers, which at Max, takes ~60 % of time necessary at 16 Amps. While its not measurable by the output data from the L2 public chargers - considering that the L2 chargers output 6 kW, and if their voltage output is 240 V or thereabouts - then the current works out to be 6000/240 = 25 Amps. However, the L2 chargers are also spec'ed/capable of 208 V outputs, I believe - so I am not certain that 25 Amps is the actual current, but it's at least 25 Amps at 200+ V is the way I would state it. Setting the Max implies the car decides the maximum it will draw, and be limited only by the external charger's maximum capability - while 16 Amps or 8 Amps means that the car will limit its draw to these values. The L1 charger supplied with the car draws 12 Amps.

 

Great! Thanks, Wrinkle!

I'm currently stuck with a JuiceBox 40 Pro in my garage, and EnelX is dropping all US support... but it sounds like I can trust the RX to draw as much as or as little as it wants. If so, then I can just let the JuiceBox be a dumb device after it goes brain-dead this Friday.

Thanks again.

 

I use 32A Level 2 portable charger and the traction battery portion fills up empty to full (30-90% SoC) in little over 2 hrs. Given the traction battery 14.5 kWh usable capacity and 6.6 kW onboard charger it looks like the car indeed utilizes full capacity of its charger.
I have tested 48A Level 2 wall charger as well and the results are the same.

The only time I used the charging limit was when using portable 32A L2 charger connected to 20A 220V socket with adapter (if I remember correctly with 16A limit applied the charging time was 4.5hrs or so)
I assume the L1 charger cable supplied will never "abuse" standard 15A AC outlets unless there are other loads connected to it - then the charging limits might be handy to prevent circuit breakers from tripping.

Just my 5 cents

Brgds

K

 

Thanks, KrzysiekKTA! That's three cents more than I get from most people. Much appreciated.

 

6.6kw/240 volts is 27.5 amps. That is your maximum.

My understanding is that the onboard charger will only take that much current, so the lower the voltage, the lower the power which is why public chargers often don't provide full power.

The supplied EVSE will only draw 12 amps, whether at 120 or 240. There are EVSEs that will supply 16 amps at 120v, such as the Tesla Mobile Connector (when using the optional NEMA 5-20 plug), but most will only draw 12 amps to protect the typical 15 amp 120v circuit.

 

Thanks, WellsB. I have my Juicebox 40 Pro on a dedicated 50A circuit & breaker in the garage, and that's what (for now) will provide the vast majority of my charging... evidently at up to 27.5A. Currently it's set to provide a max of 32A for my ex's BMW i3, so it seems I can just leave it at that.

I don't anticipate doing much charging with the supplied portable EVSE, but I appreciate understanding my options there. Thanks much.

 

The cars can draw a maximum of 32 Amps. This is what I suspected, and is noted in this Rav4 Prime thread. If the L2 charger voltage is lower than 240 V (say, 220 V or 208 V), car can increase its current draw to saturate its 6.6 KW internal charging capacity - but the current draw "Max" is at 32 Amps by the car. Level 2 chargers by themselves can allow up to 80 Amps, but in the Toyota/Lexus Rav4 Prime or NX450H+ or RX450H+ cases, the Level2 charging "Max" as can be set in the car corresponds to 32 Amps.

If anyone has hard data proving otherwise, please share.

 

my emporia 40amp into 60amp breaker (theres two breakers that say 60 dunno what that means that are tied together) charges my car at a max of 30-31amps even though i set it for a max of 40. So I assume that 32amp limit is correct on 240v for me '24 rx450h+

 

As I understand the math a bit better now (thanks, @WellsB !), it seems that one would only hit 32A if the voltage is relatively low. Unless I've misunderstood the math (which is TOTALLY possible, me being me), where a 6.6kW onboard charger divided by 240 Volts = 27.5 Amps, then that same 6.6kW charger might draw 32A if the input voltage = 211.2V.

( kW / V ) * 1,000 = A

(6.6kW / 240V) * 1,000 = 27.5A
(6.6kW / 211.2V) * 1,000 = 32.0A

It would make sense that the 450h+ would support a max of 32A for safety reasons, but if one's source voltage were indeed exactly 240V, then the power actually flowing would be down around 27.5A.

 

Yeah, I believe you are right. Though it is wired for 240v i believe the true delivery is below in voltage around 210-220. Dunno why...whatever, lol but I do notice on my UPS devices around the house i hover between 115-119v rarely hitting the full 120 depending on peak times of the day and amount of power the house is using load wise.