Basically the difference the EVCS charges comes from the grid, which is not reflected in the UI. Guessing why we do not use a grid meter, but use the inverter for metering.
Yes, some will say just fit a meter, we could do that. However, this is a simple UI logic for Cerbo. It could easily calculate this difference from the existing data and reflect this on the UI for customer.
Is there a way to achieve this without fitting a meter on grid side?
You can check this for yourself on the next EV charge.
I understand that does not solve your issues of the numbers not adding up: I am a bit confused about it, because you have some values showing on the grid card, so your multi measures grid usage, but is not aware of the grid → EVCS energy.
It might seem like a simple UI logic to just calculate the difference and show that, but obviously for systems with other energy flows, those kind of ‘logic visualisations’ are not used in VRM: we always keep to the data attributes we directly have access to, to make sure we never show faulty or calculated values.
.
