Examples of changing discharge current on KH inverters
Posted: Wed Sep 11, 2024 6:01 pm
Long story but because of the way that we plan to have the EV charger (granny socket) & Hybrid inverter (H or K series) in the garage on the opposite side of the house (fed by a 16mm 3 core evultra cable) we don't have the option to place a CT clamp so it avoids the EV charger. So...
Hopefully around October time we're be in the situation to get a hybrid inverter with a few batteries and i'm looking to ensure that as i'm on intelligent octopus go I don't want the EV charging to drain from a charged battery (which potentially could happen at any 1/2 hour in the 24 hour period. My plan would be to charge the house battery (fox cube system) during the cheap off peak rate of between 23:30 / 05:30.
I have managed to create a couple of automations which work today to detect when the EV is charging by looking at the power draw from the Eastron SDM230 modbox connected via a EW11 wifi adapter and these work great. The emails match up perfectly with the actual performed charging plan from octopus:
EV charge start detected :
EV charge finish detected
My plan is to connect the K series inverter via the RS485 A/B connector to the same A/B bus which feeds the EW11 wifi adapter/Eastron SDM120M (I assume this is ok as I have set the modbus ID on the SDM120M to "100" and the modbus.yaml uses "slave: 100" for all of the entities. Anyone confirm this ?I
Also - The big question i have is does anyone have any examples of controlling the discharge current of the K series inverter so I can set this in the automations above?
I'm still 50/50 about the H vs K series at the moment so not sure if that influences anything here.
Thanks in advance
Hopefully around October time we're be in the situation to get a hybrid inverter with a few batteries and i'm looking to ensure that as i'm on intelligent octopus go I don't want the EV charging to drain from a charged battery (which potentially could happen at any 1/2 hour in the 24 hour period. My plan would be to charge the house battery (fox cube system) during the cheap off peak rate of between 23:30 / 05:30.
I have managed to create a couple of automations which work today to detect when the EV is charging by looking at the power draw from the Eastron SDM230 modbox connected via a EW11 wifi adapter and these work great. The emails match up perfectly with the actual performed charging plan from octopus:
EV charge start detected :
Code: Select all
- id: '1725986901136'
alias: EV charge start detected
description: ''
trigger:
- platform: numeric_state
entity_id:
- sensor.sdm120_active_power
above: 2
condition: []
action:
- action: notify.me_gmail_com
metadata: {}
data:
message: EV charge start detected at {{now().strftime("%Y-%m-%d %H:%M:%S")}},
we are seeing {{ states('sensor.sdm120_active_power') }}kW so will now set
the KH battery discharge current to zero
title: EV charge start detected at {{now().strftime("%Y-%m-%d %H:%M:%S")}},
we are seeing {{ states('sensor.sdm120_active_power') }}kW so will now set
the KH Battery Discharge Current to zero
target: me@btinternet.com
mode: single
Code: Select all
- id: '1725986972966'
alias: EV charge finish detected
description: ''
trigger:
- platform: numeric_state
entity_id:
- sensor.sdm120_active_power
below: 0.01
condition: []
action:
- action: notify.me_gmail_com
metadata: {}
data:
message: EV charge finish detected at {{now().strftime("%Y-%m-%d %H:%M:%S")}},
we are seeing {{ states('sensor.sdm120_active_power') }}kW so will now set
the KH Battery Discharge Current to normal rate
title: EV charge finish detected at {{now().strftime("%Y-%m-%d %H:%M:%S")}},
we are seeing {{ states('sensor.sdm120_active_power') }}kW so will now set
the KH Battery Discharge Current to normal rate
target: me@btinternet.com
mode: single
Also - The big question i have is does anyone have any examples of controlling the discharge current of the K series inverter so I can set this in the automations above?
I'm still 50/50 about the H vs K series at the moment so not sure if that influences anything here.
Thanks in advance