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There's akways system losses, but the percentages are quite small. I think the hybrids freed DC direct to the battery, do cuts out one of the losses. The other source of losses from multiple inverters is down to how the amp clamps behave, and sometimes the inverters are slower to respond to load...

I got to do some high profile jobs as a subby to the main contractors. Trouble was the councils approved contractor was not happy about this and took every opportunity to criticise everything. They lost every argument 😀

This video should answer a lot of your questions. Not sure about your inverter, as I've never fitted one if those, but manuals should be available on line somewhere. The cables should be supplied with the batteries, you probably already have the long ones you need to wire to the inverter.

You can use a hybrid without batteries, and many so called AC battery inverters are hybrids, without solar panels connected. Hybrids are dearer, but it will cost less than having two separate AC battery and solar inverters. Also it helps with DNO application, if you retrofit an AC battery...

I gave up on council type work for similar reasons. What I was finding was that other contractors might be onsite a year or two after we had completed a job, then reel out a long list of criticisms of our works to the council, who would then demand repairs free of charge. And so I would end up...

it's also fair to say a L-N short is unlikely, as the CPC is bare copper for a good reason. Ergo, any LN fault is more likely to be an appliance than the cable.

Here's one video

Shorting any battery is dangerous, so I'm not sure. It may well be worth a look for a YouTube video on how to do what you want to do. I think your battery can be set for forced charge via the app, so basically it fully charged them from the grid, which is another way of balancing them out that...

Not familiar with these batteries, but I would be rather surprised if the master cannot work alone.

Not necessarily, being armoured cable that can stop voltage opens working.

Have a rummage in the settings to turn ads off. Welcome.

Shutting down pumps for even just a few hours overnight will make a big difference. With solar, it will spend more time working at say 60% of capacity than at full tilt. Less in winter, so I would install the pv array first, with hybrid inverters, monitor the system, then try to work out if...

Ok so are you talking about old style mains cabling, as in the stuff that has oil in it? Most of the DNO network around where I live is still this cable, and in serviceable condition. Quick look at wiki shows this. If it's PCB contaminated, that's nasty and carcinogenic...

I rewired a house rebuilt just after WW2, all the wiring being natural rubber. The main lengths of cable were still in good condition, but where they entered any accessory, the insulation fell off as soon as you removed the faceplate. So it's not so much the cable runs, but anywhere you get a...

General rule if thumb, if someone else has interfered with your work, then any evidence has been destroyed, so no chance of winning a court case. You made it clear you are not familiar with these freezers, it was the customer who wanted you to have a look to save money. So I would not be...

If what you are talking about is what I think you are talking about, I wouldn't even contemplate trying to keep any if that cable. It's roughly 90/100 years old, certainly pre WW2.

Could well be taken off the downstairs flat.

The box will save you around £40, and you will find it difficult to get all the new bits in, if you can find all the parts you need like neutral and earth bars, plus the mounting brackets for the. Buy a new board and save yourself a lot of swearing 😀

You could buy one of these to test your sockets. They are not infallible, but should give you some indication of earthing presence. https://www.screwfix.com/p/lap-16a-socket-tester-230v-ac/91596?srsltid=AfmBOop7_fTb4DOzyTV9ZPiaXCaJjX_LXUK_sF2C1KbANHye0Epes6GbHVY