Tazer ESS Battery Testing

[WranglerMan]

Has anyone with a manual experienced the parasitic draw? If not, I may dive in and marry mine back up, at least with 11.0.6.

Dan,

I would marry it back up and see what happens, I would suggest you take daily voltage readings at the source for several days to see if there is an issue, I am currently on day 2 with it plugged back in but it’s been married for almost two weeks and I had just been using the vehicle settings, my JL is an auto and I’m running 11.06 firmware

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[jeepauug]

thanks. ordered.

 

[WranglerMan]

Day 3

Tazer plugged in

12.55 Main
12.54 N1
12.55 N2
13.8 EVIC
12.55 ESS

Day 3

Tazer unplugged

12.60 Main
12.60 N1
12.61 N2
00.00 ESS ( was not checking this voltage when first starting )
13.2 EVIC

Today’s voltages were slightly lower than day 3 with Tazer unplugged but not overly low, when I initially started measuring voltages I was not measuring ESS voltage correctly as I was measuring a combined voltage off N1 but when I did correctly start measuring ESS voltage on day 5 it was very close to the N1 voltage.

Also am seeing a slight increase in the EVIC displayed voltage from 13.2 to 13.8-13.9 so this tells me the alternator is throwing more voltage to the batteries but it’s also cooler out here and rain but JL is garage kept so I would think that the temp drop would not affect the charging voltage that much unless it was a significant drop in temps so I guess we will see what day 4 brings but if voltages contiune to remain low and EVIC displayed starts to run in the high 13’s to low 14’s we can only assume that the Tazer being left plugged in is causing a slight parasitic draw on the batterie(s) as the EVIC displayed voltage average over 7 days with the Tazer unplugged ran 13.1 and the highest non average readigng was 13.9 and lowest was 12.6 on cold starts the 13.9 was only one time dropped down shortly after driving.

Had to run some errands today and had the JL running on the road in stop and go traffic and left it running almost the whole time out and was gone about 45 mins or so and the EVIC idle voltage dropped from the 13.8-13.9 to 13.0-13.1and I enabled ESS several times and it worked as designed and upon restarting the Tazer disabled as it’s supposed to as I assume Zauto has the programming set to check ESS status while JL is running

 

[WranglerMan]

Day 4

12.55 main
12.57 N1
12.58 N2
12.58 ESS
13.4 EVIC


Today’s voltages were uneventful and very close to what they were with the Tazer married but not plugged in so my intentions are to finish up my voltage tests in a few more days then come up with 7 day averages on both and post at the end of this 7 day run.

My initial guess is going to be that the voltages of both will be very close but that’s not to say that it may be a slow parasitic draw but we are also now finding out that Uconnect has also had issues that caused looping and not allowing the JL to sleep and running down the batteries, I know there are some bugs in the Tazer firmware but from my understanding Joe is working to correct these and hopefully the next firmware update things will be all good.

 

[WranglerMan]

Today’s voltages and ride in to work were again uneventful, my EVIC cold start displayed voltage does seem a tad higher than what it was with the Tazer removed but not by much, my plan is to take readings for two more days then compile each one of the voltages for each 7 day run and list the high, low and 7 day average and when I may even pull the Tazer back out but not take any readings and just see if my daily EVIC cold start voltage drops.

At this point I’m actually not sure if the Tazer is causing a minimal and I mean minimal parasitic power draw, I have exchanged some info with Joe and I know he is just as concerned if not more concerned on this issue and is working hard to find the cause if there is one to be found.

I have tested and contiune to test the ESS function and it works perfectly when I choose to manually engage it and up startup the Tazer automatically turns ESS off

Day 5

12.65 Main
12.65 N1
12.65 N2
12.63 ESS
13.2 EVIC

 

[jeepauug]

FYI, picked up my multimeter - thanks @WranglerMan for the recommendation.

The dealer's test just after a dead battery was 12.60; my test this morning with my trusty multi-meter was 12.45. The EVIC reads 14+.

 

[OldGuyNewJeep]

Today’s voltages and ride in to work were again uneventful, my EVIC cold start displayed voltage does seem a tad higher than what it was with the Tazer removed but not by much, my plan is to take readings for two more days then compile each one of the voltages for each 7 day run and list the high, low and 7 day average and when I may even pull the Tazer back out but not take any readings and just see if my daily EVIC cold start voltage drops.

At this point I’m actually not sure if the Tazer is causing a minimal and I mean minimal parasitic power draw, I have exchanged some info with Joe and I know he is just as concerned if not more concerned on this issue and is working hard to find the cause if there is one to be found.

I have tested and contiune to test the ESS function and it works perfectly when I choose to manually engage it and up startup the Tazer automatically turns ESS off

Day 5

12.65 Main
12.65 N1
12.65 N2
12.63 ESS
13.2 EVIC

Thank you for doing this. I’m not taking readings as religiously as you are, but am drawing the same conclusion. Tazer is not draining my battery as far as I can tell.

What’s the weather like in your area? With and without Tazer my voltages are lower than yours. Either it’s colder where I am in CT, or my batteries are not as shiny an new as yours are. I park in my garage which stays about 5o degrees. At work I park outside and temps have been in the 30s.

 

[WranglerMan]

A fully charged battery should be somewhere around 12.65 12.7 but that’s all dependent on the outside temp, the colder it is the lower it’s going to read, your reading of 12.45 is approx 75% charged and the closer it gets to 12.7 the EVIC voltage is supposed to drop as again from my understanding it’s supposed to keep the battery at the minimal charge and by not sending 14+ volts to it all the time it’s supposed to help battery life

 

[WranglerMan]

@OldGuyNewJeep temps here in south Texas are not nearly as cold as where you are, cold here is 35-40 and we only see a few days of that, most times morning lows are around 50-60 and my JL is garage kept so it’s like 60 in my garage

My main battery is not very old as it was replaced by dealer but ESS battery is original

 

[jeepauug]

Chicago, cold morning after sitting outside all night -12.45; warming up to 40's today so will see.

 

[jeepauug]

12.5

 

[WranglerMan]

12.5

That does not sound bad for being out all night, what voltage is your EVIC displaying

 

[jeepauug]

14.5 EVIC

 

[WranglerMan]

14.5 EVIC

Well mine this morning after sitting all night was 12.65 on both main and ESS and EVIC display 13.4, after being parked at work all day ( 12hrs ) EVIC displayed was 13.4 and by the time I got home it was showing 13.0 and I pulled a quick reading off the main and it was 12.8 but that was a combined voltage I’m thinking as I did not pull the ESS negative

 

[WranglerMan]

Well only one more day after today and I will be putting my meter away, today’s voltages were very consistent to what they have been running all week and only slightly different than what they were when I had the Tazer unplugged, it’s alittle warmer here with a morning low of like 50 deg and my voltages reflected the warmer temps

12.58 Main
12.59 N1
12.59 N2
12.60 ESS
13.0 EVIC

The EVIC starting displayed voltage on cold start had been at 13.2-13.4 but as you can see today’s was 13.0 and after getting to work it was at 12.8, I wish I would have had my meter in the Jeep as I believe if I had taken the voltage readings they would have been in the 12.7-12.8 range as the lower output of the alternator tells me the battery was near full capacity.

When I had left work last evening my starting evic voltage was 13.4-13.5 but when I got home 30 mins later it was 12.9-13.0 and I did use my meter and the batteries were at 12.8 so again that tells me I have system that was monitoring the condition of my batteries and only sending what was needed from the alterantor to keep the batteries at the minimal peak charge.

I’m not the engineer that helped develop the charging system and a lot of what I am saying are educated guesses but what I can tell you is during the last 13 days my battery voltages have been running 12.55-12.65 on the main and 12.50-12.60 on ESS, we have had some cooler nights here over the last 13 days but nothing like some are exposed to but these voltages in my opinion are acceptable being on average 85-100% charged

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