Thanks Bill, Phil, Paul etc,
I replaced the battery a couple weeks ago with an Optima Yellow-Top $330 -
so have to wait till next winter to see if there's brake drop out issues
when cold occurs <25F). The original recall for 46K vehicles for cold
braking dropout was for *Regen* not happening due to a *software* issue and
to download the latest software to correct the problem - but if the brake
booster vacuum pump is dropping out due to a less than stiff impedance
battery, that's a different problem. That's the thing with intermittent
issues, sometimes hard to diagnose accurately (when everything's fine).
I'll let you know next winter.
Best regards, Mark
Message: 1
Date: Mon, 28 Mar 2022 11:28:58 +1300
From: Bill Dube <billd...@killacycle.com>
To: ev@lists.evdl.org
Subject: Re: [EVDL] Followup: Nissan Leaf 2013 Cold Brake (dropout)
Recall
Message-ID: <a4d63aab-175a-215d-0729-076e46bc3...@killacycle.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
The voltage on a lead-acid battery goes _up_ in cold weather, by the way.
Under load in cold weather, however, the higher impedance will tend to make
the 12 volt battery voltage sag under load.
But the the vehicle DC-DC is working when the brake issue arises, so the
battery will play a smaller role. Worth looking at the 12 volt system
voltage when the brakes are applied.
Perhaps there are additional loads such as power steering load that will
cause the 12 volt sag when the brake boost becomes an issue.
Bill D.
Have a renewable energy day,
Mark
Mark E. Hanson
184 Vista Lane
Fincastle, VA 24090
540-473-1248 phone & FAX, 540-816-0812 cell
REEVA: community service RE & EV project club
Website: www.REEVAdiy.org (See Project Gallery)
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