Yes ELVs <50Vdc.  IMHO its sheer madness to be involved with MV dc Panel strings - way too dangerous  IMHO in a domestic environment, and we dont have the skilled tradesmen to recognise this type of micro grid nor is there a recognised route to upgrade to this unfamiliar but hazardous system.  Way too many unschooled wannabees playing with fireworks.  It is utter negligence by our Political leaders to allow this to continue.  They only woke up to the hazards of amateur plumbers who didnt understand flammable atmospheres till a few houses were blown up flattened.  Then British gas had to step in a institute proper training courses with local tech colleges.  Where do our Electricians get proper upgrades?  A one man jobber cant afford an apprentice (with all the paperwork and oversight involved). He will only have a family member or friend involved.

I would hope that most domestic installs would be done by an MCS approved, qualified electrician.  If nothing else, you'd struggle to get export payments on a DIY system.

I've checked the logs from my system today.  It has two series strings, and each produced up to about 4A at 350V.  Nothing that an ordinary electrician couldn't handle.  It's well within the limit for LV.

Where do our Electricians get proper upgrades?

There seem to be quite a few courses available - e.g. https://www.napittraining.co.uk/courses/trade/renewables, https://www.tradeskills4u.co.uk/product-category/solar-pv-courses or https://gtec.co.uk/courses/renewable-energy-training/solar-pv-training-course and lots of others many based on City & Guilds qualifications - e.g. C&G 2399. Try google.

   - Andy.

Octopus Energy recently updated their T&C’s to remove the requirement for an MCS Certificate, The SEG terms already had alternatives to MCS.

I am aware of two installs without an MCS cert who do get Export payments.

However, SEG and export are not worth the aggravation for the payback these days.

In a good amount of cases you can get a far better installation by going to a good quality electrician rather than an MCS installer - the shocking statistics on poor installations would seem to support this. 

So, how many accidents and from how many installations? To be worth acting on it has to be a lot more dangerous than falling down stairs, or perhaps being run over, as for normal persons we consider that an acceptable risk.(*)

I will point out that there are not enough accidents prevented to justify Part P, and I suspect there aren't really enough to justify gas-safe either, certainly when comparing with countries in which no such regulations exist but to suggest removing either would be political suicide, so we are stuck. I'm not sure we want another set.

Mike.

(*) most adults approaching middle age will know of at least one person lost in a car crash or similar. Some will know more than one. less than 1% will personally have known someone electrocuted or killed in a gas explosion - it is just so rare it ends up as headline news.

Pandora's box has been opened here

Microgeneration Certification Scheme (MCS)

https://www.gov.uk/government/publications/register-energy-devices-in-homes-or-small-businesses-guidance-for-device-owners-and-installation-contractors/register-energy-devices-in-homes-or-small-businesses-guidance-for-device-owners-and-installation-contractors

Just when you thought that the summary dumping of Part P responsibilities on to the LABC (who had no historical involvement in electrical installations) was a complete dog's breakfast, and IMHO remains so to this day and from experiences of Landlords, widely open to brown envelopes.

Remember gentlepersons that the domestic electrician's primary skill involves "house bashing - that's a trade term and needs years of experience" - this is not to be deprecated in anyway. The industrial electrician is an elite class holding authentic credentials in order to be allowed on site or employed by a Company.  These persons wouldnt trade their coveted positions for the Solar Wild West country.

The average domestic electrician is a sole trader operating from home and he has to weigh the costs of trading legitimately against competing with rogue chancers who abound.  You can be a hairdresser today, slap some stick on vinyl flashy advert on the side of your van and carry on as "Instant Electrics".  Here today, gone tomorrow Strawman.

Given that over half the cost of a Roof Panel installation comes from labour and scaffolding (mandatory ???) you can see that installation persons dont need any electrical certification (maybe half day course on how to use a ladder) and can plug in MC4s (even crimp them up).  We have the dubious practice of a young persons finishing tails under supervision of a "Competent Person"  You get the picture?

Nowhere in any of this labyrinth of obfuscation is there any requirement for anyone to be properly trained in dc power systems. As a certified and authentic EE (not Power btw) I have spent a year looking at the problems of domestic DIY Solar systems on most of the relevant Forums covering USA/CA OZ EU and the Leisure craft/RV.

If you want a good example of the kind of hazards you can face then the widely acclaimed site https://www.youtube.com/@OffGridGarageAustralia  will surely open your eyes.  Ignore all the bells and whistles of batteries and BMS just look behind at the electrical installation behind it all  and think about kids playing with fireworks with a can of petrol nearby.  The guy is a former IT technician and it shows a superficial grasp of dc power systems  (think of MCBs for solar panel disconnect under full sunshine  an OZ scandal since corrected when resulting in numerous alarming arc flash fires)

(FYI the ABYC has a long history and wealth of experience  certifying electrical systems on boats, they have their own "Codes" and authorised inspectors to UL standards - if your craft is not signed off you dont get insurance and that limits where you can moor your boat - its quite draconian and there are numerous examples of fire aboard caused by electrical faults)

There is no credible UK Solar forum to exchange User experience.  We cant even recognise the problem of highly publicised  Escooter fires from faulty products we blithely allow to be imported from Cheap Charlie  see YT https://www.youtube.com/results?search_query=escooter+fires.  The CE mark is a treacherous joke (meaning China Export)

Pandora's box has been opened here

Microgeneration Certification Scheme (MCS)

https://www.gov.uk/government/publications/register-energy-devices-in-homes-or-small-businesses-guidance-for-device-owners-and-installation-contractors/register-energy-devices-in-homes-or-small-businesses-guidance-for-device-owners-and-installation-contractors

Just when you thought that the summary dumping of Part P responsibilities on to the LABC (who had no historical involvement in electrical installations) was a complete dog's breakfast, and IMHO remains so to this day and from experiences of Landlords, widely open to brown envelopes.

Remember gentlepersons that the domestic electrician's primary skill involves "house bashing - that's a trade term and needs years of experience" - this is not to be deprecated in anyway. The industrial electrician is an elite class holding authentic credentials in order to be allowed on site or employed by a Company.  These persons wouldnt trade their coveted positions for the Solar Wild West country.

The average domestic electrician is a sole trader operating from home and he has to weigh the costs of trading legitimately against competing with rogue chancers who abound.  You can be a hairdresser today, slap some stick on vinyl flashy advert on the side of your van and carry on as "Instant Electrics".  Here today, gone tomorrow Strawman.

Given that over half the cost of a Roof Panel installation comes from labour and scaffolding (mandatory ???) you can see that installation persons dont need any electrical certification (maybe half day course on how to use a ladder) and can plug in MC4s (even crimp them up).  We have the dubious practice of a young persons finishing tails under supervision of a "Competent Person"  You get the picture?

Nowhere in any of this labyrinth of obfuscation is there any requirement for anyone to be properly trained in dc power systems. As a certified and authentic EE (not Power btw) I have spent a year looking at the problems of domestic DIY Solar systems on most of the relevant Forums covering USA/CA OZ EU and the Leisure craft/RV.

If you want a good example of the kind of hazards you can face then the widely acclaimed site https://www.youtube.com/@OffGridGarageAustralia  will surely open your eyes.  Ignore all the bells and whistles of batteries and BMS just look behind at the electrical installation behind it all  and think about kids playing with fireworks with a can of petrol nearby.  The guy is a former IT technician and it shows a superficial grasp of dc power systems  (think of MCBs for solar panel disconnect under full sunshine  an OZ scandal since corrected when resulting in numerous alarming arc flash fires)

(FYI the ABYC has a long history and wealth of experience  certifying electrical systems on boats, they have their own "Codes" and authorised inspectors to UL standards - if your craft is not signed off you dont get insurance and that limits where you can moor your boat - its quite draconian and there are numerous examples of fire aboard caused by electrical faults)

There is no credible UK Solar forum to exchange User experience.  We cant even recognise the problem of highly publicised  Escooter fires from faulty products we blithely allow to be imported from Cheap Charlie  see YT https://www.youtube.com/results?search_query=escooter+fires.  The CE mark is a treacherous joke (meaning China Export)