Just let you know that i’m in Thailand.
And I understand that SENSE was designed for US market.
But i really happy to use this in Thailand as well.
Its cool gadget and there is room for improvement.
My case was “abnormal” with 1-phase 220 V and 50 Hz frequency.
Same as EU-region. (We don’t split-phase 120/240 V 60 Hz frequency like in US)
SENSE works fine for almost a week, data analysis was working great. (3 devices found so far)
But here is a problems. (I believed this might come from frequency different between us?)
The real-time data was delayed.
As you can see from picture. When i view the real-time data on 10:57.
But the graph’s time-stamp show 10:35 !
I test by turning the light ON-OFF, and yep.
This is definitely real-time data feed. But the time-stamp was shifted almost 30 min. !
I try to reset SENSE (Switch breaker OFF and then ON)
The graph was sync for 5-10 minutes, and getting SHIFT larger and larger.
Maybe, because of frequency different (60 Hz & 50 Hz) cause timing-error and its getting shift larger and larger ?
I’ve noticed this symptom will follow with problem #2 as well. (Find below)
Data sampling was freezed.
Find attached photo.
sometime when i take a look at the graph, the Watt usage was freezed (For example 450 Watt for a minute)
And then after 10-20 minutes, it will back to normal sampling rate.
Disconnected.
After 1-2, the device will disconnected.
See the gap of graph, when SENSE completely disconnected and no data transmit to server.
And it will be back online again in 5-10 minutes.
What does the Settings > My Home > Sense Monitor say for mains voltage and frequency ? Here’s a typical nighttime reading for a system that also includes solar.
PS. We have two-wire in Thailand.
One is Line (+220 volt), another one is Neutral (ground)
the 2nd picture is my setup.
White-wire goes to upper busbar. (Neutral)
Black-wire goes to circuit breaker (220 Volt Line)
Another Red-wire i plugged into breaker too, but i keep it OFF all times (Not needed.)
The Clamp goes to big-black-wire. (220 Volt Line)
So, my reading is 220 Volt / 50 Hz for only one phase (Another one left empty) !
My 2c. Monitor readings seem to be as expected for your configuration… Seems like the Sense power supply is dual voltage an dual frequency. The main timebase for Sense shouldn’t be related to the line frequency. But the sampling and DSP filtering firmware probably do make some assumptions about the relationship between the sampling frequency and the mains frequency. If Sense is sampling 20% more data points per AC cycle than expected, there likely could be some strange side effects.
I take a look at real-time meter.
And time delay was about an hour ! (cannot scroll right, and the app show blinking real-time data plot from SENSE server.)
Anyway to fix this ?
Perhaps, in the next firmware ?
I am not sure how much success you will have as the system is designed for 120V two phase at 60Hz.
Your system is ~230V at 50hz single phase, as you stated above.
The system may not be able to cope with the latency from Thailand to the U.S.
In ConUS it would typically be less than 40ms. More for Alaska, Hawaii, Samoa and Guam.
Make sure that sense has a great wireless connection. Noise or interruptions will affect the performance.
Hi @porsatan eems like we are in the same or similar situation. I’ve just received my sense here in the Philippines and struggled to get the thing working to begin with.
We have a similar setup to you here ie one phase 220v but 60Hz.
I eventually got it working by brute force by ignoring the error message on boot up just so I could create an account and got readings but they showed negative watts and wouldn’t display on the chart presumably because they were negative. Anyway resolved that tonight but just reversing the CT clamps and now I get proper readings.
What confused me on install but have since learned is that the black and red should be both live, one for each phase? Obviously we don’t have this setup.
So what you have done makes perfect sense (excuse the pun). Only using half of the sense wiring.
I’ve got mine working as I said but surprised it is after seeing how you have wired your up.
Here’s a quick overview of mine:
Both CT clamps installed, one on the hot leg in and the other on the neutral in. Then black and red connected to a double pole breaker (one side is live the other neutral) and the white neutral wire going to ground.
Here is a screen shot of my app. Looks odd as I’m getting different voltages on each channel. Perhaps no mystery considering how it’s wired up…
A small update from my side. I had an email from sense coincidentally concurring that the correct way to install this device for a single phase is as described in this thread.
i.e. Black Wire Live, White Wire Neutral, Red Wire not required (only used for second phase). One CT clamp connected to the hot leg. The other CT clamp not connected.
Now I’m just waiting for the signal check to finish. I’ve never got passed this step before. So will just wait patiently. (How long does this usually take?)
One point to mention is that after the device booted up I got the error chime. I assume this is because it can not detect any power from the second phase (deliberately as it’s disconnected).
That’s interesting Alan.
Congratulation to your successful installation.
Just let you know, My SENSE just died 3 months after usage.
Theoretically, the Voltage sensing should not broken when expose to over voltage, for example, just 220 V in Thailand.
Maybe it just a defective unit. But i’m fully aware that my guarantee will void.
So, no hash feeling, just want to try.
Please let me know, if your SENSE could work in Philippine in more than 3-4 months.
I’ll happy to buy another unit and try again.
Hmm I will let you know… hoping it lasts now I’m a little concerned. Do you think it was because the unit is rated at 120VAC per leg and we are using 220VAC?
Did you get many devices detected? I have 3 so far and expected the big items like AC to be the first to register but in fact it’s only found refrigerator, water chiller and rice cook so far. Waiting patiently for the others to pop up.
My findings so far after one week are similar to yours.
Sounds like we have a similar setup! I have 3 split A/C inverter type (Samsung) not detected at the moment. Also have a grundfos water booster. Also not detected yet but still early days.
All of our lights are LED, none of them detected as yet.
Washing Machine (Whirlpool) not yet detected.
Exhaust hood over our gas cooker not detected yet.
Rice cooker, refrigerator, water heater are the only things found at the moment. Woke up this morning to find the sense of offline. Haven’t restarted it yet. Hope it comes back online.
.