Myenergi question

dublinman1013

Hello,

• I got solar panels installed last week
• When I have nothing on in the house - it shows that the house is using 0 kWH. When I turn on the TV, oven etc. I can see it go up
• Today it's been 0.2kWH consistently from the house when it's been empty
• I have an air to heat pump but usually that fires up in the night with minimal usage.
• I unplugged everything (even the fridge) to test what it could be and nothing.

Any thoughts please?

• The first spike is the dishwasher
• The second is the kettle boiling
• The third one I was out of the house
• The fourth one was the kettle boiling.
• I assumed the little peaks in the evening were air to heat pump but not so sure.

K

rob w

There is other stuff though that would draw power though that you cant just plug out - like a doorbell transformer, smoke detectors, oven (clock/electronics), the solar inverter itself consumes power, have you got any smart lightswitches/sockets that are consuming power when off?, electric gate controls, intercoms, alarm panels, heating controls etc - there is lots of potential sources of power draw there - they all add up!

Those short spikes you see every hour or so is the fridge compressor kicking in. Otherwise the fridge isnt really doing anything. Temp drops, it kicks in - cools down and goes off again.

My base load rarely drops below 180watts in the house

It could be an anomaly in the measurements of course, as in they aren't accurate?

dublinman1013

Thanks. I don't understand then why it was 0kWH all last week though and now 0.1 since yesterday.

• I have a switch for the fridge on the wall and turned it off for a few minutes and made no difference.
• If it's not the fridge - all I can think of is it's the air to heat pump but it's really warm outside.

graememk

https://www.boards.ie/discussion/comment/122384752#Comment_122384752

Do you have mhvr?

dublinman1013

I have a Aereco Demand Control Ventilation (DCV) system (whatever that is) - according to the manual.

Could it be that generating the 0.1kwh with the extra heat?

graememk

https://www.boards.ie/discussion/comment/122385201#Comment_122385201

Possibly, warmer weather can drive up the humidity too.

Heatpump would be a much much higher spike

bullit_dodger

https://www.boards.ie/discussion/comment/122383938#Comment_122383938

Following on from rob's comments above, the best way I've found to isolate usage (or at least help narrow the field) is to use the circuit breakers on your consumer unit. Turn off each individual breaker noting the drop (or not) in usage.

It might not get you the exist applicance/location, but you might then be aware it's downstairs/upstairs sockets etc. As rob mentions, there's a lot of things out there drawing a few watts here/there. Wifi routers, sky tv boxes, smoke alarms (mains fed), alarm systems, Alexa devices/google……etc

rob w

https://www.boards.ie/discussion/comment/122384752#Comment_122384752

Well 0 kw was definitely not right anyway, there will always be something drawing a little power. It was probably zero because the measurement wasn't being picked up due to a communication issue or something. Is the Grid CT hardwired or via a Harvi?

Like I said before the fridge only runs intermittently. It may not have been drawing any noticeable power when you switched it off, so it wouldn't make a difference to the reading. You'll know it's drawing power when you hear it humming (open the door for a minute and it will kick in)

graememk

https://www.boards.ie/discussion/comment/122386145#Comment_122386145

Good point on the harvi, if the current isn't high enough, there's not enough power flowing for it to harvest some for it to run

slave1

Calibrate the readings with a meter reading over a few days, your 0 usage could be roundings