question

@Brookydave There are ways of doing that without NodeRed but on a different note, you might want to check the terms and conditions of your export tariff. I'm assuming you have solar PV to enable your export tariff? ESS on its own won't be accepted for export generation. All UK energy suppliers state within their domestic export terms and conditions words to the effect of;

'5 Eligibility

5.2 The generation asset must generate electricity wholly or mainly from one of the following energy sources):

(i) Solar Photovoltaic (PV);

(ii) Hydro;

(iii) Micro-combined heat and power (micro-CHP);

(iv) Wind;

(v) Anaerobic Digestion (AD).'

Export on a domestic tariff is excluded if from a domestic battery system as they have for a while classed that as a commercial activity because you are speculating on the energy market rates.

'6 Ending or changing the contract

6.9.5 we have reasonable grounds to believe you are abusing this contract, for example if you are using the scheme on a commercial basis rather than for domestic use'.

The way they find out is if you are exporting when there is no possibility of solar generation - ie during the night so if you only export during daylight hours and you do not exceed your export allowance on your DNO approval notice, you should be fine.