I am still in the buying and planning stage to go off grid, I have 42kw of battery storage, 17kw of solar panels, (I live in very cloudy Wales) and a multiplus ii 10000/140 inverter, as well as the lynx shunt, distributer, and cerbo gx.
My current setup is a 3kw micro inverter system with a F I T which pays me around £700 a year.
The plan is to go off grid, until the battery is depleted, then set the multiplus to automatically charge from the grid ( more than likely during December)
So my question is, if the FIT system charges the batteries via the "back door" of the multiplus, as well as the other solar panels, during the summer months, I should very quickly have a full battery, at this stage, no more power would be required from the FIT array, but if I shut them down with a frequency shift, the generation meter would stop counting, meaning I'll receive less money. So I was wondering if there is a relay made to transfer all unused power from the FIT array to the grid, by disconnecting the panels to the consumer unit (which is isolated as off grid) and transfer the power to the grid line, which would also be isolated via the internal multiplus contactor.
Then set the programmable relay in the multiplus to switch the FIT panels to feed into the grid once my batteriesare full, then switch back over to battery charging once the batteries have gone down to say 80% soc.
Is such a switing system available?