AppleFan1

Why do we have these two options? What’s the difference? Does it mean that when charging at home, we should set it at home charging and when charging on the highway we set it at standard? Again, why is there a distinction? Does it hurt the high voltage battery if charging at home and it’s set on standard?

Diesel Benz

You must be referring to the different charging profiles that each can be configured to the owners liking. The applied profile makes no difference but the settings for each. One might prefer to charge for 80% at home and set that profile to activate on the location basis. On the road one might want 100% battery level because the car would be driven after charging and not parked at a higher than 80% SOC as recommended. Occasionally one might want full 100% at home when leaving to a long trip. Then select the standard profile if that was configured for 100% even if charging at home.

EDIT: some of the multiple spelling errors fixed

Newbyloub

While I’m sure, DB85…, your answer made sense to you as you posted it, but I find the wording of your second and last sentences confusing.

AppleFan1

Thank you for the explanation. So, to sum it up, it really doesn’t make a difference. Obviously, if I go on a very long trip, I would charge it at home overnight to 100%. I should know this, but I don’t really know what SOC stands for.

c4004matic

Simply 2 max charging level settings, since it knows when you are home it will select the appropriate level without interaction.
A good idea is 100% at home and 80% away (for DC).

AppleFan1

If you’re not taking a long trip, why would you want to charge to 100% at home? I thought it was healthier for the battery to charge to 80%.

c4004matic

It is, but if you charge to 100 you get less charging cycles and the charging is at a slow rate. I dont mean charging every night to 100, rather charging 20 to 100 at home. From what I know the most detrimental conditions for battery longevity are temperature and number of cycles, how full you charge it is a much smaller factor. Thus if you charge it full (at level 2) you decrease the number of cycles and you avoid thermal stress. Im not a battery engineer, but I think it mostly evens out. Any battery experts feel free to chip in.

hlothery

I don't disgree with many things you say, but I do disagree with this. Charging always to 100% while at home, even though it would only occur once a week or so, is contrary to what most manufacturers (including MB) recommend. I'm not sure any of us really know what the definite answer is, but I will continue to charge to 80%, unless I plan to go on a trip the next day. YMMV.

Tjdehya

I think you are misunderstanding what a charge cycle is... I did too.
A charge cycle is a discharge of the total capacity of the battery. So If you charge to 100% and dissipate to 0% that is one charge cycle. If you charge to 80% and dissipate to 70% and recharge to 80% that is only 1/10th of a charge cycle. So if you were to charge to 80% every nigh after spending 10% on your daily commute. It will take you 10 days to get to 1 charge cycle...It is not considered as 10 charge cycles.
So it doesn't matter if you charge to 100% and wait to recharge at 0% or if you charge from 70-80% nightly for 10 nights... they are both 1 charge cycle.

c4004matic

That s a good explanation!
Here is an article that is also pretty good on the subject. It also covers the question of the battery buffer well. Unfortunately manufacturers never quote the real size of the battery (closely guarded secret) only the usable portion. The best estimate on the EQS is that the battery is 115kw.

c4004matic

Here is an excellent analysis on EQS charging (different topic). But its a good explanation of why peak charging rate is not the the best measure of charging performance. Fast and steady is as good or better as very fast but peaky. MB has done it homework very well. Even the Tesla's Plaid (supposedly the king of battery technology) can touch it.

Diesel Benz

Sorry, I also find the text confusing, not only because of spelling errors. I think later posts clarified the point much better.

By the way, do you only have two preconfigurable charging profiles? Makes no real difference but for some reason the 223.168 has three: home, work and default.

c4004matic

Sorry I forgot to add a link to the charging analysis
Mercedes-Benz EQS Charging Analysis Reveals It's Faster Than Plaid (insideevs.com)

perlfather

What is most detrimental is the amount of time the battery stays at the maximum charge. So there is no harm in charging to 100% so long as you leave very quickly once it gets to that charge level. For long time storage you should keep the battery charged near 50%. The number of charge cycles is not that important - so long as you stay between 20 and 80%. Keep in mind that every time you step on the brakes it charges the battery (unless you exceed something like 0.7Gs). One reason that battery life of cell phones (watches, etc.) is often given as cycles/life is that most people - especially those without an electric car - always charge their phones to 100%. With your next phone, try the 20 to 80% charging routine and see how much longer the battery maintains its 100% capacity!.

StormingHabs

All great points and also why Apple implemented a feature to try to learn when you take the phone off the charger in the morning and holds the charge at around 80% until it’s time to do the remaining 20% just in time for when you wake up.

bluebaron

SOC stands for 'state of charge'....hope that helps.