Okay everybody, another update. I'm having some intermittent episodes of low battery state of charge after sitting for a day or two or sometimes less. I came out this morning and my state of charge showed 30% on my scan gauge and the battery level was low on the feh display. But it's building back up fairly quickly and when I started to drive. Are there some things other than the battery that I should be looking at as possible sources of discharge?

 

What is your DEL_MOD_V value before starting the car, and what is it 10-15 minutes after start?

 

I'll have to check that next time on Forscan. I don't trust the DEL_MOD_V I get from the Scangauge. It consistently reads about .01. What's puzzling is the intermittent nature. Sometimes it can sit a week and be at 55% SOC and other times it will be at 30% after a day or two.

Greg

 

S Keith,
This morning I got the Stop Safely message and the car quit shortly after start up. On Scangauge the BSOC was under 40%. I tried to start again and the SOC dropped eventually down to 15%. I have the jump button, so performed that and the car started.
I hooked up the Forscan at this point and the BSOC was 15.5% and the Del Mod V was .50.

• After 30 seconds it was 16.1% and .19.
• 1 minute= 18.2% and .06,
• 2 minutes=30.6% and .13,
• 3 minutes=48.4% and .19,
• 4 minutes=53.3% and .13,
• 5 minutes=52.3% and .13.
• While driving Del Mod V would bounce between .06 and .13.

What do you think? Is there something I should be looking at outside of the battery?

 

As mentioned previously, Del_mod_V of 0.5 indicates you have one or more failing cells likely unable to retain charge. This tends to manifest itself at lower SoC and/or after sitting overnight or longer. Your prior post demonstrated del_mod_V at .44 when the battery was at >50% SoC and >360V, which again points to a failing battery.

The car does not keep track of SoC when it's off. If it was 40% at start up, it was 40% at shut down.

The drop in SoC after start was the car recalculating SoC based on voltage response to current at the new temperature. By using the jump starter, you bolstered the weak cell(s) to the point that Del_mod_V narrowed and allowed the car to start and charge. Continuous driving CAN keep the value to the more narrow range.

Next time you go to start after an overnight sit, I recommend that you check Del_mod_V with key on, engine off before starting the vehicle. You may find it's worse than 0.50. Additionally, when you go to start the car, watch the live data and see if del_mod_V spikes briefly due to the draw from the motor-generator as it starts the car.

It's possible some phantom load is draining the battery, but checking that out is the next step.

 

Thanks, I found this in the log file of the startup from this morning. This was after the jump start.

 

Okay, so it looks like an 8A load (presumably engine start) caused the Del_mod_v (dV for short) to hit 1.06, then it started charging by as much as -14.91A, which lowered the dV. dV stabilized to something in the 0.5V range and slowly came down with relatively low current charging.

Would repeat this process tomorrow before first start.

 

During acceleration a few times today I saw this. Never saw anything like this before when driving. Still intermittently low BSOC in the morning when I start, but usually comes up pretty quick without having to do a jump.

 

If that's showing DEL_MOD_V of 2.44, that battery is toast. You should have no expectation of reliability.

 

Well, I got another warranty replacement. Installed it today. Any suggestions on anything I should do before trying it?