Can an electrician swap my MCBs for RCBOs?

flameport said:

If you want a single specific item in BS7671 that states 'do not connect solar to multiple circuits' then no, there isn't.
If that type of thinking was continued, BS7671 would be thousands of pages of specific entries attempting to cover every situation possible.
Fortunately standards are not written like that.

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Quite so

flameport said:

Very few people in the general population install solar. Those that do install solar certainly should have it.

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Hum

flameport said:

There is no requirement to update older installations to the current version of BS7671.

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Precisely

flameport said:

However the original enquiry was about installing RCBOs instead of what was there, so the choice of updating has already been made. Whatever is installed as the replacement should comply with BS7671 and other relevant standards.

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Which is a completely different conversation

As I previously wrote why didn’t the muppets simply state EV and PV circuits must be dedicated AND where appropriate have a dedicated double pole RCD

I find the whole debate about plug in solar a bit pointless. We already have plug in solar, we already have grid tie solar, and we already have balcony solar, but they are not permitted to back feed into the grid, the inverter/battery pack often has provision to fit solar panels, it grid-ties, so battery only used when unplugged, or switched off, and acts very much like a UPS. There is a warning that there is around a 40 mS delay between feed through and battery power, so not suitable for some UPS applications.

To back feed to the grid, we need a MPAN number, or we get no pay for it. And to adjust output to match the demand, we need a CT coil on the main tails, plus a battery to store energy when we are not using it. We do have the likes of iboost+ but that only kicks in once exporting over 100 watt, which is great with a 6 kW array, but bit pointless with an 800 watt array.

So answer to question is yes, but with a proviso note, that there would be little gain, to ensure we do not get spikes tripping the RCBO we want a SPD and it would also need all new buss bars, so the extra work fitting a whole new consumer unit rather than upgrade the old one is minimal. So no real point, may as well fit a new consumer unit.