[ErroneousBosh]

I've been looking at Victron gear for an off-grid power system up north (initially for a caravan, will get migrated across to a house once the upgrading and repairing is done).

A huge decision on that was that they publish a fat PDF with the full spec of the serial data they emit and can be programmed with, and a service sheet to allow a suitably skilled engineer to fully bench test them if there are any perceived problems.

They're not cheap, but my late father always used to say he didn't have enough money to buy cheap tools.

Edit: handy hint too - many cheap crappy power bricks will work down to 90V and will work just as well off DC as well as AC because the very first thing they do is rectify and smooth the incoming supply.

I do not recommend having 90V DC kicking around unless everyone involved knows what they're getting into.

[cwillu]

Yeah, 90vdc is an immediate nope from me: way too easy to suffer a painful death.