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Volt Charging Graph

3413 Views 10 Replies 9 Participants Last post by  Dante
I hooked up my new Plugshare charger with WiFi. I noticed that every 2 hours it does a quick charge again. Would this be just topping up the battery?

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It runs the DC-DC converter for a while every so often, and tops the battery up, because while it is plugged in there are 12V systems running. Basically, no, I don't believe it is charging or conditioning the traction battery, it is charging the 12V system.

That's why the recommendation is to leave it plugged in while you are away. The car monitors all its own systems, and might even provide active heating and cooling if necessary.

I've seen this on mine too, of course, it is what it is meant to do. But I have not noticed it to be so frequent as your graph. It might be prudent to check the health of your 12V battery, though I am not suggesting there is anything wrong with it, just that I would not have expected so many 12V charge events.

In the case of heating, you will see excursions over a kW and probably all the way to 3kW. It is possible what you are showing is short runs of the AC, which only uses 500W or so at minimum operating power. But I wouldn't expect you are experiencing 24hr heat requiring that just yet in the year, wherever you are. I imagine it would need to be over 30C for this to be repetitive traction battery cooling events.
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I do not believe that it charges the 12V battery during those times.
If that's true, then why doesn't the 12V battery go flat if the 12V system is burning something like 100~200W all the time, to power the BMS?

Or do you 'believe' that all the BMS and control electronics are working at 400V?

Think about it! Pretty obvious it is topping up the 12V system.
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