9/29/2020 10:45 AM | |
Joined: 3/30/2014 Last visit: 8/26/2024 Posts: 85 Rating: (0) |
What's the idea. I want to measure the production of my solar panels and the consumption of the electricity grid. With the help of 2 energy meters I can achieve this. Not necessarily, but with a 3rd energy meter you could measure your own consumption and perform a form of automation on it. You could then use a washing machine, dryer, dishwasher, heating etc. at those times when the solar panels yield the most. This project is open to everyone, improvements, comments are welcome. I think LOGO! deserves its place in a home automation. Let this project be part of it too. A little clarification. I3 are the incoming SO pulses. B001 is the first divisor. The value for ON depends on the number of pulses that are issued by the kWh meter. (I have discovered that if I leave B001 at 0, I automatically create a generator in the simulation.) B002 = the decimal value. B003 are the kW hours. B011 adds B003 and B002, and displays this result on display: xxxx.y The big problem now is that B011 stops at 32767. This means that we can measure up to 3276.7 kWh. My knowledge is not big enough to get around this, or it is a limitation of LOGO. Any change, idea or whatever is welcome. If it really didn't work, then I tried it somewhere. Everything after I4 is therefore for the 2nd measurement, so it must be the same as I3 AttachmentkWh counter.zip (436 Downloads) |
9/29/2020 4:19 PM | |
Joined: 12/18/2014 Last visit: 10/6/2024 Posts: 33883 Rating: (4215)
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I am not aware of any method. The LOGO! is not a PLC, but a programmable relay.
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9/29/2020 7:06 PM | |
Joined: 2/22/2008 Last visit: 8/6/2024 Posts: 2698 Rating: (207) |
Maybe a first step is to show right energy values on the display. For this just use counters without arithmetic operations, see attachment. I also think, there are faults in your calculation independent of the limit 32767. The principle is as follows: The first counter is to adjust the S0 impulses to 100Wh, then you get a resolution in kWh with 1 decimal place. The second counter is for kWh with the resolution 100Wh, maximum is 999.9kWh, reset by 10,000 The third counter is used for MWh without reset. If you don't need the 100Wh resolution, then just setup the first counter to fully kWh. Then change second counter to reset by 1000 and delete the arithmetic block, this is only used for the decimal place. Maybe also you don't need a third counter, because with fully kWh you can count up to 999,999 kWh. If you need further information, how to compare counter values for other actions, there are available some tricks. But for this we need more informations, what exactly you want to do. Regards, Scorp AttachmentkWh counter2.zip (434 Downloads) |
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