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Can you show how you installed the monitor and are using it? Do you use it while driving or just stationary? Any thoughts on how to tell if the batteries and charging system are healthy or not based on the data you are getting?
You are absolutely correct thanks again. How did you know so much detail?
Here is a graph of voltage since I installed them. I compared both 12v batteries and they have essentially the same graphs, which does seem a little odd. I would think they would discharge at different rates. The monitors run 24/7, parked or driving, shipping mode or not, because they are connected directly to the battery terminals. The monitors use ~0.013W so insignificant. For an AGM battery, charging is around 14v, float charge around 13.5v, and nominal 100% charged battery around 13v. The truck has been sitting in a garage, GG off (I think, I will update if not), no connectivity or waking up, and yet you can see that after it stops charging, it immediately begins to slowly drain. I will do a shipping mode test next week but I expect the same.
More data as promised. I had to stitch a couple screenshots together to achieve the pics. Labels are inset:
Temps 40s to 50s.
These charts have been very informative. What would be the warning signs of weak 12v battery or one about to go bad on a chart like this?Here you have it folks, a solid shipping mode test. As you can see (not very clear actually but I checked closer in the app) the 12v batteries last about 20 hours before they need to be recharged by the big batteries. This is much better than "non-shipping" mode - GG off, no connectivity - it only goes about 4-6 hours without charging. Going to check back in and post the kW lost in the trip meter later today, I had to rush this morning to the office and only had time to gather bluetooth data.
Wish I could tell you but I don't have a clue! But I will try: I suppose if voltage dropped quickly after recharging rather than a steady linear decline, and also if the battery needs to be recharged very often, or the voltage drops below 12.3V. It seems to start charging when it reaches 12.3v. My guess is that the inverter would hide any symptoms of bad batteries by attempting to charge them more often, but surely there is some logic in the code to detect charging "too often". Any time the truck unlocks, it starts charging, and keeps charging until long after you park it and walk away, so I would say that typically a 12V battery failure would have to be a catastrophic one in order to brick the truck because the HV battery acts like a backup to the 12V's.
