Emporia monitor shows dip in power every 2 hours, on the hour!

[GoodSam]

Any idea why the Emporia system would show a dip in power usage periodically? I do not remember seeing this before. Hmm, I see the dips happening at minimum power usage as well so it may be just something with the monitor. Or communications. Weird, it is happening every 2 hours showing a dip, on the hour! Like 3:00 p.m. 5:00 p.m. 7:00 p.m. 9:00 p.m.@TaxmanHog . Thx!

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[mq019]

If I was a betting man, I'd bet that something in the sensor or application chain is resetting or refreshing a session every 2 hours. Probably some kind of random instability issue was identified that occurs sometimes after 2 hours, so they just setup a session refresh every 2 hours to get around that.



* edited for spelling

 

[TaxmanHog]

I've also seen the drops in previous charging sessions, though my last couple of sessions were short this weekend, so no dropouts shown, I took advantage of the EvGo DCFC credits on Saturday, then topped off to 90% end of the day and again on Sunday to close out my weekly charging record.

The last multi hour session was on 5/24, but the data log by the minutes/hour has aged off so I only have the day and week data rolled up and can't see if the ~2 interval was my experience, I'll grab a screenshot next later this week, preparing for and recovering from a trip to Boston (Logan) to pick up family flying in.

 

[Shmoe]

Any idea why the Emporia system would show a dip in power usage periodically? I do not remember seeing this before. Hmm, I see the dips happening at minimum power usage as well so it may be just something with the monitor. Or communications. Weird, it is happening every 2 hours showing a dip, on the hour! Like 3:00 p.m. 5:00 p.m. 7:00 p.m. 9:00 p.m.@TaxmanHog . Thx!

Not sure if it's the same issue or not but the Emporia cloud was suffering some downtime over the weekend that definitely caused weird spikes on my end.

 

[mr.Magoo]

Not sure if it's the same issue or not but the Emporia cloud was suffering some downtime over the weekend that definitely caused weird spikes on my end.

I was just gonna say...

The log isn't super granular so it could just be that a measurement or two is missing for whatever reason and what is perceived as a "dip" is just the mean value over time.
If you can zoom in / look at the event itself you'll see / know if the reading at the time truly was 5kW or if the data is missing.

 

[bmwhitetx]

Any idea why the Emporia system would show a dip in power usage periodically? I do not remember seeing this before. Hmm, I see the dips happening at minimum power usage as well so it may be just something with the monitor. Or communications. Weird, it is happening every 2 hours showing a dip, on the hour! Like 3:00 p.m. 5:00 p.m. 7:00 p.m. 9:00 p.m.@TaxmanHog . Thx!

Confirmed. But I think it's just an app glitch. When I zoom into hour detail, on my last session (7 pm - 4:11 AM), it showed the dips at 10, 12, 2, and 4ish.

But then I zoomed out to Day and back in to hour and the dips were at different times. Every time I zoom out and back the dips change or sometimes not even there. Here the 2:00 glitch moved to 2:30 and then after another unzoom/zoom, moved to almost 3:00. No longer at 2:00. And nothing at 4:00 now.

 

[TaxmanHog]

The next time I charge, I'll look at the live view of the data stream, it might be dropped data or it could be a slow down in the rate.

 

[Dan C]

I have seen this occasionally on my charge point ap when I am at a 19.2 kwh charger. Nevergave it to much thought.

 

[TaxmanHog]

If you have a recent charging session, pull the data log, inside the zip file are various log's, look at the by the second data table which is only available for the current day.

I only have the by the minute log data from last Saturday.

 

[bmwhitetx]

I was able to download by-the-second data for 3 hours for my session. Stayed a constant 9.2-9.3 kW despite the graph showing a dip around 9:59 (but only sometimes - see my post above). There were no missing 1-second values, each hour had 3600 entries (60 minutes x 60 seconds).

For the time period between 9:55-10:00 values were 9.2-9.3kW for each second and all seconds were there despite the graph dip at 9:59.

Still convinced it's an app bug in summarizing the raw data into a graph.

 

[TaxmanHog]

Charged today to get HVB up to 90%, from 70% to see if I can replicate your experiences.

Took in about 32.78 kWh per emporia, there were a couple of dipps, the first was just a little over an hour into the session, then another shortly afterwards, nothing further by the end of the session.

Hourly recap.

Live data zoomed in on the dipps, each lasted ~2 minutes.

Raw data extract during the dips
First Dip lasted 59 seconds

Second dip lasted 30 seconds according to the data log.

 

[TaxmanHog]

Incidental data I like to collect during sessions

 

[TaxmanHog]

After returning from Boston early this morning, I recharged from 60% to 90%, this time just one dip.

Tried downloading the Emporia log file, for some reason it would not give me anything for midnight to to 0600 this morning so I couldn't see how long the slow down lasted.

This session started around 0115 hrs

 

[IJP86]

Any chance that's when your AC or other large appliance is kicking on and creating a power surge?

 

[TaxmanHog]

Any chance that's when your AC or other large appliance is kicking on and creating a power surge?

In my case, no.... my detached garage is on an independent service feed directly from the adjacent pole, no other major loads.

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