-rick-

So these properties are all owned by a single person with no plan to sell separately? If you wish to preserve an easy option to sell separately it sounds a fair bit more complex than otherwise. If operating as a pooled resource there may be options to get more efficiency out of the system. (Multi-tenant inverters exist, someone posted a link here recently).

There are two incompatible standards for wiring the connectors. As long as both ends match it works, but if you mismatch and there is a non-standard power setup on the cable you might be in trouble. (it's safe if there's no power feed or if its POE standard)

In general ethernet is 'safe' even if miswired. I hesitate a little as in the case of Starlink they transmit power over the cable as well. If this is done in a standard way then no issue, if non-standard then potential issue. (I think Starlink is fairly standard but have not checked and wouldn't want to take the chance without being confident) So to be safe the best thing to do is to find a guide on how to terminate the cable specifically tailored to the exact model Starlink antenna you have.

This is news to me, I thought 4mm was standard. Either way I agree with you, for the long run 6mm makes much more sense for the small cost uplift and it makes sense whether the tails on the panels is 6mm or 4mm as the upsize is purely for voltage drop/efficiency not load carrying capacity. Disagree strongly*. If you are planning multiple strings then it would be better to install an inverter that supports 800v and run one string of 16 panels rather than 2 of 8. Current and therefore voltage drop on the cable would stay the same but you'd be transmitting twice the power and hence improve efficiency. * @Beelbeebub mentioned multiple houses, in which case I'd guess it's not possible to put them all on one string as there will be separate inverters. I'd also think in those cases you wouldn't want to use a single cable (or even a single trench) to allow proper separation of responsibilities.

No an electrician but I thought over the distances we are talking about you need to install a local earth rod. Earthing would only be for the metal work and wouldn't touch the DC AFAIK.

Most code these days is horrifically optimised. Someone who knows what they are doing can often find orders of magnitude speed ups if they look hard enough. IIRC @Pocster used to work in game development and to get this far even with AI is, I think, showing that experience. There are likely a lot of speedups still to be found even in webgl which is hardly the fastest way to do 3d graphics. What I want to know though is what happened to the original plan? This is all very pretty but I don't think the mountains are telling @Pocster what's for dinner or where he left his socks. Which I thought was the starting point of all this

Modern panel open circuit voltage is often ~45v so 8x45 is 360v

Indeed, modern fast lines are all welded rail so shouldn't clack unless travelling over points. Noise profile their will be very different to a rickety old freight line with heavy aggregate trains back and forth all day.

Surely this depends on the voltage the array/string is at? With modern inverters often wanting arrays of 800-900v, you'd need less CCA on DC than AC. Even the older but common 350v arrays/strings would be better over DC than AC. DC is more efficient at long distances. The conversion between different voltages and safety of the system.

I get the impression from watching builders on youtube that the variation between states is quite significant, with those states with higher and denser populations having much tighter rules and those states that have very cold winters having much tighter rules. Still overall, Americans are well known for using vastly more energy per capita than other parts of the world. It's the typical result of very polarised politics. Democrat gets in and tries to get tighter rules. After big fight, watered down rules get put in then Republication gets in and undoes them (and even makes them worse than before). Thankfully a lot of rules are by the states, the federal ones are minimums that the states often exceed and the states have more stable politics (for good and bad).

Think it depends which model you have. If you are only repairing a break you only need to match the colours on both sides. The only real condition is to keep the each twisted pair near each other to maintain signal integrity.

Couple of notes: 1. If this is outside then you'll need to find a waterproof enclousure for the coupler (might be able to find purpose built cable joint - but it needs to maintain the signal integrity) 2. If just making one or two cables you can get away without the crimp tool by using a flat bladed screwdriver on each of the pins and the cable restraint clip. But if you want easy get the tool (they aren't expensive) 3. Starlink will provide a new cable if you prefer (likely at a cost but you might be lucky)

Why not buy and fit a new cylinder? Super easy and cheap to do.

If it's a recent ish model I thought the cable was basically an ethernet cable. So you can get normal rj45 connectors and crimp them on and then get a back to back coupler.

Mortice is the minimum. Modern euro cylinder locks (assuming you get the right spec) are considered superior (and accepted by insurers in all locations AFAIK) especially if it's installed in a multipoint lock. I would always prefer the eurocylinder as they are easy to change if you ever need to change the keys. Can be keyed alike all round the house and if you want to get really fancy you can get a master keyed set with grouped or independent locks for the doors (allowing you to give some people limited access and others full access). Obviously the more sophisticated setups are more for commercial use but there are uses at home and you can order sets online for not huge money.