Install of a largish MyEnergi Libbi battery

[MrPablo]

How does it work then if Octopus don't require MCS?
Have you arranged payment for export even without the MCS certificate, and if so, what was the process you went through?

[Tinbum]

Interesting video- loverly to see people taking real pride in their work.

Came across this one that is the opposite and really frightens me.

[sharpener]

Some of the explanations are a bit simplistic but I can't see a lot wrong with it. I was amused by the 1V drop between the loft and the garage, since he was making an open-circuit measurement so there was no current flowing at the time anyway.

The worst bit is terminating the PV string leads without explaining that he has (presumably) first disconnected the cables at the MP4 connectors (or ideally with additional isolating switches) in the loft. I would not like to be relying for my personal safety on there being no earth path, electrocution is much more probable with DC than AC as you are less likely to let go.

[Tinbum]

The worst bit is terminating the PV string leads without explaining that he has (presumably) first disconnected the cables at the MP4 connectors (or ideally with additional isolating switches) in the loft. I would not like to be relying for my personal safety on there being no earth path, electrocution is much more probable with DC than AC as you are less likely to let go.

I don't think he has, that's what frightens me.

[Countrypaul]

The worst bit is terminating the PV string leads without explaining that he has (presumably) first disconnected the cables at the MP4 connectors (or ideally with additional isolating switches) in the loft. I would not like to be relying for my personal safety on there being no earth path, electrocution is much more probable with DC than AC as you are less likely to let go.

I don't think he has, that's what frightens me.

He certainly didn't seem to take any extra precautions in the loft where immediately after measuring the voltage on the cables he terminates them.
Familiarity breeds contempt coes to mind.

[sharpener]

I don't think he has, that's what frightens me.

He certainly didn't seem to take any extra precautions in the loft where immediately after measuring the voltage on the cables he terminates them.
Familiarity breeds contempt coes to mind.

Is that what you were originally concerned about @Tinbum?

I wasn't terribly impressed with either of my PV installers but in both cases the roofers pushed stub cables terminated with MP4s through the membrane and the sparkies connected them up when they had safely done the rest of the cabling. Exactly in line with what I was taught, work backwards towards the connection to the source of power.

[ALAN/ALAN D]

I am surprised that the company name is on the van.

To show 290 volt D.C. Cables being stripped live with metal cutters using his thumb to push the metal cutting blade while the insulation gets pulled off while the other cable already stripped bare dangles by his arm.

How it should be done.

Mark the cables that are going to be run from the roof to the loft.
Use a single RED PVC tape to mark one cable at both ends.
Use a double RED PVC tape to mark one cable at both ends.
Use a single BLUE PVC tape to mark one cable at both ends
Use a double BLUE PVC tape to mark cable at both ends
Run both pairs of string cables from inside loft to roof.
Mark the cables the same way from the loft to the garage isolator.
Connect both string cables to the D.C. Isolator switches in the garage.
Crimp MC4 plugs and sockets on both strings in loft and plug together.
Crimp MC4 plugs and sockets on cables on roof.
Plug MC4 plugs from panels to roof to loft cables.
Go down to garage. Check voltage / polarity on both strings.
With cables marked red / blue you will always know what plug / socket goes where.

Electric shock at D.C. At that voltage is far more dangerous than a A.C. Shock.
A.C not good. But most times you do get thrown away from the cable.
D.C. Much worse. You remain connected to the voltage. Again with D.C. Your skin starts to burn big time.

[Stinsy]

I am surprised that the company name is on the van.

To show 290 volt D.C. Cables being stripped live with metal cutters using his thumb to push the metal cutting blade while the insulation gets pulled off while the other cable already stripped bare dangles by his arm.

How it should be done.

Mark the cables that are going to be run from the roof to the loft.
Use a single RED PVC tape to mark one cable at both ends.
Use a double RED PVC tape to mark one cable at both ends.
Use a single BLUE PVC tape to mark one cable at both ends
Use a double BLUE PVC tape to mark cable at both ends
Run both pairs of string cables from inside loft to roof.
Mark the cables the same way from the loft to the garage isolator.
Connect both string cables to the D.C. Isolator switches in the garage.
Crimp MC4 plugs and sockets on both strings in loft and plug together.
Crimp MC4 plugs and sockets on cables on roof.
Plug MC4 plugs from panels to roof to loft cables.
Go down to garage. Check voltage / polarity on both strings.
With cables marked red / blue you will always know what plug / socket goes where.

Electric shock at D.C. At that voltage is far more dangerous than a A.C. Shock.
A.C not good. But most times you do get thrown away from the cable.
D.C. Much worse. You remain connected to the voltage. Again with D.C. Your skin starts to burn big time.

You are of course correct. How difficult is it to do all terminations in order, starting at the load (inverter] and finishing at the supply (string). This is a basic principle of electrical installation!

[Tinbum]

Is that what you were originally concerned about @Tinbum?

Yes.

[AGT]

The worst bit is terminating the PV string leads without explaining that he has (presumably) first disconnected the cables at the MP4 connectors (or ideally with additional isolating switches) in the loft. I would not like to be relying for my personal safety on there being no earth path, electrocution is much more probable with DC than AC as you are less likely to let go.

I don't think he has, that's what frightens me.

He certainly didn't seem to take any extra precautions in the loft where immediately after measuring the voltage on the cables he terminates them.
Familiarity breeds contempt coes to mind.

I thought he made the one of the string cables from the roof longer than the other to prevent accidental touching