Brake energy recovery - How does it work?

[Breezy_Pete]

Banging on about politics on a car forum has always struck me as an outstandingly pointless exercise.  

All the best xman. 

[Andysuew]

13 hours ago, Wino said:

The magnitude of the voltage peaks is interesting to me, minimally higher than a conventional alternator (at cold temps anyway). I have a feeling if I fire up my car shortly, at frosty degrees C I'll see similar initially.

Seems to contradict the notion that start-stop batteries need a higher charging voltage than regular batts. In fact, almost all the time, they have a much lower one.

 

@Andysuew Is your battery AGM or EFB? presumably still the original?

 

Could you estimate the ambient temperature in which these logs were taken? Pretty warm in your location I guess, 30C+? 

The peaks don't seem to reduce noticeably during the course of each drive, so engine bay temperature doesn't seem to modulate the peaks down.

Have you considered doing a comparative log with LIN connection to alternator unplugged?

 

A UK winter-time data set (or just peak voltage numbers) might be interesting, anyone over here doing some monitoring on one of these new-fangled systems?

 

Here's my 'voltage across battery posts' at first start at around 0°C, conventional alt, and battery.  It reduces as the engine bay warms down to around 14.3V.

 

4 week old Delcor AGM battery. Vehicle reprogrammed via VCDS to suit the new battery. Temperature on the days of recording was 28-30 degrees. 

 

Just a side note;

How much power does it take to run an alternator?

An alternator typically takes about 1HP for every 25 amps of power generated. So, a 100 amp alternator will require about 4HP at full output. Most alternators do not operate at full output for very long.

 

 

 

[Breezy_Pete]

Is start-stop disabled on those logged runs? 

[Andysuew]

14 hours ago, Wino said:

Is start-stop disabled on those logged runs? 

Yes, start/stop turned off. Never liked it anyway.

[Warrior193]

On 30/12/2020 at 19:52, xman said:

Thanks for the cordial reply, the bending out of shape comes from the political socialist EU claptrap and constant insulting language being posted elsewhere by less than half a dozen members, going on now for years. I think you probably know who I mean.

 

Have a happy and prosperous new year @J.R. and everyone else. 

Hi Xman (and others) why not just simply block notifications from posters who wind you up? 

[shyVRS245]

4 minutes ago, Warrior193 said:

Hi Xman (and others) why not just simply block notifications from posters who wind you up? 

Agree that works for me.

[Bap33]

Gentlemen,

we are drifting away from the original and technical topic... 😉

@J.R. Which french forum are you refering to (just curious) Never seen such discussion on the one I often read... But, I have to say I only read or attend  to technical threads... 😉

[J.R.]

3 hours ago, Bap33 said:

@J.R. Which french forum are you refering to (just curious) Never seen such discussion on the one I often read...

 

Without naming names its a "new" sort of forum, or it was when it was named.

 

If you give the bots 24 hours to have hoovered up todays web content and do a google search on the following gem of text hot off the press it should take you to the site in question.

 

It looks like it could be the end of the road for my Marmite, Yorkshire tea bags and brown sauce. Brexit morons!