Counter Log - Help with kWh calculation

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Ricardo Pinto
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Hi people,

May I ask a little help about counter log?

I have a power sensor on an electric board. On ETS, I get an Instantaneous Power object (2 bytes), which comes in kW format. Like, if the house is consuming 1200W, I get 1,2 value on ETS, if it's consuming 250W, I get 0,25 value, and so on. I have the correct instant values showing on visualization.


I've tried to create counter logs, to get an approximate daily consumption, etc. The problem is that the values on the counter log don't make any sense.


For example, if the house is consuming constant 250W during 24hour, I should get 6 kWh by the end of the day, but the values don't make sense. On one day, it showed something like 138kWh on one day, which is impossible. I deleted all data now.


Either I'm configuring all wrong the counter log, or there's something I'm missing.

Thanks for any help

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Ricardo Pinto

Anybody?

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Fabien Fuster

Hi Ricardo,

On my installation I have set it a such, but cannot figure out anymore from where I found the formula :

Intensité is in Amp and the Log Energie is in kWh after applying the formula.

I've looked again on the web to retrieve the source of the formula (and see if the result is correct), but as mentioned above, not successful so far. I look further, and should I find it, I'll post the link here. In the meantime, I hope it can help you to go in the right direction

Regards,

Fabien

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Ricardo Pinto

Hi Fabien,

Thanks for the feedback.

Well, in my case I get the data from a ZENNIO KES energy saver meter, which returns the instantaneous power consumption in kW.

If I create a Counter log with the instantaneous power consumption as the input, wasn't it supposed to calculate the daily values, etc? The values don't make any sense, I already quit using the counter log until I find the correct configuration.

I get the instant power consumption in kW and it's correct. I suppose that using that value as an input of the counter log, should calculate how much power I consumed for how long, and present the correct values.

Any extra advise would be great.

Thanks

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Andy Gill

Hi Ricardo,

I may be wrong but I think the input only takes a KWH reading, an accumulative value not instantaneous.

Assume your meter has that?

Andy

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Fabien Fuster

Hi Ricardo,

Looking into the Zennio documentation, it seems you can configure the output to be in kWh and get what you are looking for:

There quite a lot of configuration possibilities, pending what your installation looks like and what you want to achieve. Seems to be a pretty cool device... I hope this will allow you to manage what you are looking for, it is difficult for me to be more precise not having the details of your installation and expectation. 

Regards,

Fabien

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Ricardo Pinto

Hi Fabien and Andy,

I'm not using the KES PLUS, but the KES ENERGY SAVER, which got recently discontinued. Still, it looks a good device. The KES PLUS actually has more options than this, so I don't have most of the options shown.

This older unit, actually let's you get the instantaneous consumption, and I think it calculates the daily weekly and monthly consumption, but I was looking forward to use the counter log from bOS to create my own graphic instead of just getting the values from the KES.

That's why I'm not quite understanding how the counter log works.

I'll try to find any kWh values reading as Andy refered.

Best regards

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Fabien Fuster

Hi Ricardo,

Sorry for the mistake, was too quick... However, looking the right documentation (I hope ;-) - ZN1IO-KES), it seems you can send the hourly Energy consumed and even the daily one (refer the active energy section 3.3.1). Would this not be suitable ?

Fabien

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Ricardo Pinto

Hi,

I suppose... but the problem is that the values returned by the last hour consumption etc, don't make any sense, even on ETS.

It's supposed to be 4-Byte signed values, as far as I noted. On ETS, I receive stupid values like 00 00 00 03, and I'm like what?! So in bOS the values show as 0, so I don't know where to go...

Plus, the values returned from KES are pretty weird. For example, I get values for the last hour cost, and day cost etc, but they also don't make sense. Today I'm getting a last hour cost of 0,05€, and a day cost of 0,04€...yeah right.

That's why I decided to use the instantaneous power, which is real time consumption, and use it on a counter log, because the only true correct value I'm getting from the KES is the current power.

Best regards

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Fabien Fuster

Knowing you, I'm sure you have the right one, but just to xcheck : are you using DPT 13.013 ?

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Ricardo Pinto

Yep, DPT 13.013 here...

I really don't know what's wrong...it's pretty weird. Never understood this values, that's why I wanted to just use the current power and leave the calculation to bOS.

Maybe it's a stupid question, but if I know the instant consumption, and use it on a counter log, isn't it suppose the counter log to "see" how much power I used on a certain period of time?

Do I need any extra calculation?


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