Set the max battery state-of-charge

20778 Views 29 Replies 14 Participants Last post by dcdrive, Nov 10, 2020

mariopaol

Discussion Starter · Nov 19, 2018

Hi Forum,
do you know how to set the maximum state-of-charge of the battery ?

I have a Tesla since several years and it is a fundamental tool to avoid ageing of the battery (i.e., limit the max SOC to values below 100%).

Thanks !

Mario

Save

1 - 4 of 30 Posts

McRat

· #10 · Nov 30, 2018 (Edited)

You can charge a Li battery to it's rated max voltage and drain it to it's min rated voltage with no accelerated decay if you don't allow it to get too hot.

What you DON'T want to do is store it either end of the design window for long periods.

To me, it seemed the i-Pace had full regen power at "100%" charge today, which means there is a sizable top buffer. But I've only had the car 20 hours and charged it twice.

Save

Reactions: 1

McRat

· #13 · Nov 30, 2018

Well, I should be cautious with my posting. I'm not used to the EV gauges on the i-Pace yet.
While it would regen at 100% charge state, it certainly was not max regen. Which means the window on top is not large.

Save

McRat

· #15 · Dec 1, 2018

sciencegeek said:
From what I've seen in various Nyland and other videos when you can see the dashboard display icon with the recharge amount, the total amount of recharging actually doesn't add up to too much. In other words, if it doesn't regen during the first 10 miles of a fully charged battery it's not much of a 'loss'.

No, it doesn't add up to a lot on EVs except in traffic. Aero and rolling resistance cannot be recovered, only kinetic energy.
What I'm used to seeing on my dash is a kW meter. +120kW for acceleration, and -60kW for regeneration. All I can see so far on the Jag is a radial bar graph, which is not enough info to do excellent hypermiling. Keeping both numbers low reduces resistive losses since amps heat up circuits, and heat increases resistance even more. So 10 seconds at 60kW uses more battery than 30kW for 20 seconds, in both regen and acceleration. So educating your foot to keep the peaks low in both directions helps. HOWEVER, there are situations where a car will use friction brakes, these must be avoided for peak range.

Save

Reactions: 1

McRat

· #21 · Dec 1, 2018 (Edited)

Dantrium said:
If you run through the options on the instrument panel you will find the meter that gives you instantaneous energy consumption. I think it is listed as kWh/100 mike, but I cannot remember for sure. I’ll look the next time I drive

Thanks! I just played with that. It is a bit laggy, and the regen stops reporting at -99.9 kWh / 100 mi.
I'd really rather see kW flow directly, and from a software perspective, it's less code. But that's because I've been used to seeing that number since late 2012 almost daily.

I'm another person who think Miles per kWh rather than kWh per 100 miles makes more sense. I guess it's a Euro thing.
We use MPG for gas cars, and they use liters per 100km.

Tesla has no excuse for using kWh / 100 mi, or Watts per mile, or whatever. Elon Musk spent most of his life using MPG, as have most Americans. Why he wanted to go EuroStyle for fashion is totally beyond me since Tesla was one of the last companies to adopt the new Euro EV range method, WLTP. Not even sure if they have conformed yet.

See less See more

Save

Reactions: 1

1 - 4 of 30 Posts

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.

Top Contributors this Month