HBerman

I'm still getting accustomed to my new AMG EQE SUV and I'm wondering how often people charge their vehicles at home? What is the percentage of battery charge before you connect to your charger? Thanks for your responses.

bytemaster0

I guess the answer is "it depends." I know people that charge nightly. We don't. I usually charge when it's below 40% or so in warmer weather. In colder weather, when it's 50% or so. If I know we have longer travel, then I'll top it up the night before. My car I'll allow to drop down farther. My wife's EQE SUV, I'll tend to charge earlier, just in case she has longer errands to run - that way we always know it's ready to go. I think the easiest for us is every other day or every 3 days, but I tend to overthink these kinds of things. Some people just charge every night and don't ever have to worry about it because of that. I just personally like to let the battery rest at the 40-50% state if the car isn't being used. But then again, these batteries are quite resilient, and the warranty on them is great. So, just do whatever feels most comfortable!

Crito

I was charging every Sunday night but lately have been doing a lot of free charger hopping so whenever I feel the need.. like a couple nights before bad weather hits and demand goes way up seemed like a good time.

Was watching a neat video where guy measured voltage as it passed by a y-connector with one end going nowhere. Was cool to see waves of electrons moving almost exactly like water molecules. There was a wave that bounced all the way back from the dead-end and as you'd expect from water pressure the voltage on the side with open faucets was lower. In any case, moral of story is you get more voltage (pressure) at the same amps (pipe width) if you charge during off-peak hours (which depends on season). It's not a whole lot faster but it helps a little anyways.

LastOne

It is all about anticipated usage for the next day or two. With no major trips anticipated I will charge at about 20% level in summer and 30% in winter. If there is a longish trip planned then I will charge to allow a round trip getting back home with around 15%.

HBerman

I've been charging when the battery level is 50%. Newbie fears, but I'll start to let it go to 30% this time around. My trips are mostly local under 40 miles around so plenty of reserve.

guess2098

in winter, I charge my car in the morning from 6:15 to 7:30 to warm up the battery before I leave. regardless what % of SOC. but if SOC is over 90% I am not going to charge for sure.
in summer, I charge when it is below 50% during weekend.

ScottC2

We use the car mostly for short trips and around town. We have the convenience of a home charger and it seems like we are settling on a routine something like: start charging at ~20% and stop charging at 50%.
Why 50%? While I have not found this number mentioned as a typical charging goal in the user manual, I have noted that one is awarded far more points for this threshold than for 80% in Eco Coach. This tells me something :-)
For longer tips planned, we would not hesitate to charge to 80% or even 100% the night before.

bytemaster0

Lithium ion batteries are most happy between 40-50% state of charge. Hence, it's the ideal long-term charge. There are plenty of folks that work in that battery range to maximally prolong battery life. However, with sufficient use (e.g. not letting it sit for ages), it should be okay to charge higher provided the car is driven.

Bluffton Bob

Huh? In the Teslaverse (where I'm from) the common practice is to charge every night. Typically I set the state of charge at 80%. So that has been what I've done for my wife's EQE SUV. I guess I'll have to reconsider my practice for the Mercedes. On a side note we left the EQE garaged in Ohio this winter unplugged with a starting SOC of 80%. After 7 weeks the SOC is at 77%. My Tesla would have been much lower than that - which is why Tesla recommends that for long term storage you set the SOC at 60% and leave it plugged in.

LastOne

Lots of interesting tips and ideas.
@guess2098 what leads you to believe that home charging warms up the battery? Battery warming helps with fast charging but I have not seen any info suggesting that warming is performed with L2 charging.
@ScottC2 charging to only 50% required a bit more focus on future travel plans but maybe something I might adopt as I plan to keep this car for many years
@Bluffton Bob unlike Tesla, MB suggests that the car should not be plugged if the car will not be used for extended periods

HBerman

Charging the battery creates heat as a byproduct. I'm not sure how much, if anything, it affects the range if the ambient temperatures are cold.

HBerman

Mercedes recommends that the battery charge be between 30% to 50% if you will not be using the car for extended periods of time. (Page 202 in EQE SUV manual)

bytemaster0

Fascinating. That's all from the DC-DC converter waking up and charging the 12V battery. You can hear the contactors kick on every few days and a small circulation pump or fan (likely fan) running. Good to know!

guess2098

EQS doesn't provide temp monitor but my taycan has.
using L2 9.6kw at my garage for 1 hr can bring battery from 46F to about 65F according to taycan battery monitor.

for EQS/EQE (none amg), we can only compare consumption by charge vs without charge L2 in winter before driving your car.

Anything that creates or uses energy does so with some loss. That lost energy is expressed as heat. The faster the charging, the more heat is generated

HBerman

My AMG EQE SUV does provide a temperature monitor for the battery and for the front and back motor as well. The display is on the driver display panel in the center.

guess2098

yes all EQ AMG has HV battery monitor, that's why I want to do coding to enable this info on my EQS.

Aegistar

I'm charging once a week when the weather is nice. Usually charge up to 80% and at the end of the week I'm around 30+%. L1 charging over the weekend usually gets me back to 80% again.

When it's below freezing, I'm charging every night or every other night. Last thing I want is to be stuck on the side of the road in frigid temps.

Crito

Plugged in 10PM last night at 30% and was 90% at 8AM using my 24 AMP dryer outlet Splitvolt charger. Been doing so much free charger hopping lately that might actually last me two weeks. I frequently arrive back home after a Target run with 1 or 2% more than when I left and I almost always break even. It's a little ridiculous... say what you want about EVs but nobody is giving out free gas.