SenseMFSU-ASSY Flex Add-on Sensors, White

I bought these to add a couple of dedicated circuit monitors to my sense unit. Sense was having a lot of issues identifying and dis-aggregating components of my geothermal heating system so I figured this would be a good way to get an accurate usage number for those 2 circuits ( heat pump/compressor + loop pump on one circuit, zone pumps, controls, and thermostats on a second circuit ). Initially I had issues where the sensor on the control circuit was never registering anything, although it HAD to detect something because it had to see current on that wire in order to pass the setup steps. The settings allow you to choose to have a circuit listed as 'on' with as little as 3w of power consumption. I was not getting anything even well over 15w. After some debugging with tech support they made settings changes to my monitor ( which the user cannot do/see) and the sensor now seems to be detecting the same amount of current I see with a line meter with an induction clamp. I expected the current detected on the circuits to be completely left out of the device detection logic of the sense system, thus making the remaining device detection for the rest of the house less cluttered, but my system identified individual devices on their own as well as the circuit monitor. Tech support told me they did not believe it would do that. I deleted those devices thinking there was a race condition that it analyzed them before it was ready to start factoring out the circuit monitors, but new devices got discovered to take their place. I think associated those new devices with the circuit monitors and I still saw new entries pop up. Eventually things seemed to settle down so that I am no longer seeing the same current attributed to the circuit monitor and individual devices. I suspect there will still be some duplication but since it will be such smaller usage it will probably be hard to identify unless I catch it while suspect devices are seen as 'on' and can flip off the rest of the breakers and see the devices remain on. Part of the reason I figured I needed these clamps was to unambiguously isolate the detection of devices on these circuits because in over 2 years of sense usage with this heating system it had not given me a good discovered collection of devices. The compressor, fans, and pumps are all variable speed which makes it appear like a never ending list of individual discovered components, and very hard to isolate and confirm that they are all part of the heating system. In trying to get the clamp to register initially I reset my system a few times which meant losing 3-4 years of historical data. It is disappointing that after this much time I still am trying to get the system to give a reasonably accurate breakdown of the devices/appliances in my home. I understand the technical challenge, but still hoped it would progress faster than it has.Another issue I had was with the size of these clamps. What are they thinking? You already have large clamps on the main feeds into the panel, and these clamps are even bigger! They were originally for solar which should have been probably been far less than 200A in most case. Using them as dedicated circuit monitors means they are on much smaller wires. My geothermal controls circuit is a 10A 120v so maybe size 14 wire? I suspect part of the issue in getting a reading was due to the large gap between the wire and induction sensor. Pus they are taking up way too much of the limited space in the panel. I wish there had been options for purchasing smaller clamps.Sense tech support spent quite a bit of time with me and monitoring my system once I got forwarded to someone who could really dig in. It sounded like things were not behaving as they expected, and there is very little by way of documentation about what to expect when using the clamps for circuit monitoring instead of solar monitoring.It appears I still have a bit of investigative work ahead of me before I can even have a total energy usage number for my heating system. I would rather have a per dive breakdown, but I had assumed this would get me the total in a reliable fashion, which it does give me a total, but then trying to do comparison stats seems unreliable if the same current is being reported as different devices. We seem to have squashed the big one ( 6kw-8kw compressor) but there is probably still some much smaller duplication skewing the stats a bit.

I needed to purchase these to monitor the energy production of my solar array. I previously bought the Sense energy monitor to keep track of my electricity usage. I can compare the readings from the Sense monitor against the inverter application and the readings are within plus or minus 2 watts.

After many months Sense could not “sense” our whole house Mitsubishi H2i heat pump. This solved the problem but can only be used on one device. I have a heat pump water heater as well that it does not sense accurately and no way to expand. Unfortunately, Sense technology is not really capable of correctly sensing a house that use multiple new heat pump technologies.

I recently purchased the Flex Add-on Sensors.I placed the sensors on a Gas Furnace and Dishwasher since both were difficult to add a smart plug. The Dishwasher was never found by Sense and the furnace would not away identify with the "Furnace Bubble.The dishwasher is a old mechanical dishwasher, no electronics to power up. I placed the sensor on the breaker wire however it was touching other wires. I was getting up to 12 watts of standby power and false indications of usage on the Timeline. I bumped up Standby Watts and seconds. Still got status changes on the Timeline.I finally moved the Hot wire for more clearance and the false indication stopped coming in. Restored the Standby and Time setting back to default.

I had the regular Sense energy monitor, recently installed solar panels, so I made sone research and find out that the regular sense can also monitor the output of the solar panels. Just need to remove a cover on the sense monitor , then you can plug this clamps and start monitoring the solar output. Is very precise considering we used a 80’ extension, it matches the output on the microinverter QS1-A from APSystem using an ECU-R monitor. Totally recommended.

I wish the sense app would have charted my net usage with just the primary CTs. The system could calculate the net power but didn’t chart anything negative (export). Adding the CTs to the solar circuit allows you to track usage and solar generation separately. Works great. I think without the solar CTs the system can no longer recognize your loads. So you need these ifYou have solar and still want sense to recognize the various devices in your house.

I’ve had Sense for 4 years now. Recently we moved to a new home and installed Solar. I ordered a pair of new clamps to attach to the solar lines and everything worked right away. As always sense delivered to my expectations and I am really happy with their service. Every house should come with a device like sense to provide transparency to the home owners.

As with all electronics, sometimes the wires get crossed and the item is a dud. This was the case with my extra set of clamps. The main set did work and the device is trying to measure our electrical use. However, it took an hour and four separate Amazon chat agents to agree to fix the problem by me purchasing a new set of clamps (which I did) and them refunding me the $50 fee (which they haven’t).