Solar PV Monitoring/Automation Thread

I tried it but could not make it work. When I read it I get '1' which I assume means enabled but when I try to send '0' and read it again I still get '1'. The write does not seem to fail, maybe something chages it back or I'm doing something wrong.

modbus.write_holding_register_formatted(register_addr=43114, value=0)
print(modbus.read_holding_registers(register_addr=43114, quantity=1))

SENT: a5 17 00 10 45 00 00 c7 d6 2a ef 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 06 a8 6a 00 00 89 b6 7c 15
RECD: a5 16 00 10 15 00 6b c7 d6 2a ef 02 01 bd 6d b9 00 08 0b 00 00 f6 2f a4 61 01 06 a8 6a 00 00 89 b6 d7 15
SENT: a5 17 00 10 45 00 00 c7 d6 2a ef 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 03 a8 6a 00 01 84 76 35 15
RECD: a5 15 00 10 15 00 6c c7 d6 2a ef 02 01 bd 6d b9 00 09 0b 00 00 f6 2f a4 61 01 03 02 00 01 79 84 84 15
[1]

Seplos cannot control charge rate this is done on inverter side. Seplos only has on/off switch.

Has anyone installed a Shelly EM ?

I'm considering buying it but I'm wondering what will it give me over and above the Solis cloud and app?

I don't have any energy monitoring at the moment so that would be very useful -- the eddi/myenergi app does this to a limited extend but the shelly stuff is class

Have you had any joy with getting them to switch to the d/n meter?

I have a 6kW Solis hybrid inverter and the readings don't look accurate. I am polling the inverter every second over RS485.

Modbus registers:

Solar Generation - 33080

House Load - 33147

Power to Grid - 33131

Battery Power - 33150

Well technically I have 2 CTs on my mains feed, one for the PV and one is the shelly EM.

How do you mean you don't know what you used, surely in the app of your inverter you can see the breakdown?

If you use home assistant you can create two meter sensors for the shelly and when importing it increases the import sensor and when exporting the export one.

The shelly won't help you see the "usage" of your house because if PV/battery is providing power then the shelly would not see that because as far at it knows the grid is not being used.

You could get multiple EMs and put CTs on your sockets mcb, cooker, immersion, lights, etc and that will get you readings for those circuits.

That doesn't sound right, pretty sure all inverters installed to SEAI spec must have a separate meter with a CT clamp that reads the grid and then you will have all these values.

Is this a diy job?

If you simply want to know which way the energy flows and how much energy is flowing then yes the shelly will give you that, - value when exporting and + value when importing

I did a lot of research about the different power monitoring options, there is a number of options the TLDR is I went for the Emporia Smart Home Energy Monitor with 18 CT clamps, but everyone might pick a different options for different reasons that work best for them.

Emporia Smart Home Energy Monitor - this is what I ordered just the other day waiting on delivery, it has CT clamps for two main supply (only need one in IE) and 16 small 50amp ct clamps for each circuit, down side is the space needed and the number of wires, it connects to a cloud service for the data which i don't like but people have gotten ESPhome and home assistant to work with it (https://www.youtube.com/watch?v=z0Jv4nO9OWg) you can pull the data from the cloud to home assistant as well. I might move it to fully local at a later date.

I have it linked to my Home Assistant with the data in InfluxDB and Grafana for visualizing the data, it works home assistant Energy with the integration in the home assistant HACS

there is 3 options- main supply only, main and 8 CT clamps, main and 16 clamps

cost - €80-180

Shelly - I like Shelly stuff but the power monitor is a bit limited unless you buy a lot of them making the cost quite high and you then end up with a lot of them to fit in the box, it seems to be designed to just monitor the main incoming supply from what I have seen. (I know it can monitor any supply but it starts to cost a lot)

cost €50-500

Sense - again it just uses two CT clamps on the main supply (USA two for split supply, one in UK), they then use "AI" to identify what is using power, reviews are mixed on how well it works. issues with picking up things that stay powered all the time and things that might use different levels of power at different times. although it would need less space to setup

cost €300+

Home - Sense.com

ESPhome - very DIY and very cool but takes a lot more setup also to get 18 clamps like the Emporia it's expensive but it's total local and will give some more info i think at a faster poll rate if you want it.

cost - €80-500 depending on what you buy, shipping, import etc.

ESPhome website - https://esphome.io/index.html#

shop for power parts - https://circuitsetup.us/product-category/power-management/

Yeah I can recommend the ShellyEM, easy to install and set up (be careful though and completely isolate you distribution board when installing and even then treat everting is live...), integrated easy into Home Assistant. Yes it does record negative values for electricity going in the opposite direction so you can measure your PV export. The polling is live so you get almost instantaneous readings.