Right, Black Friday's always a mixed bag innit. Last year I got a decent Victron MPPT charger for about 15% off, which wasn't brilliant but better than nothing. Thing is, the really good kit doesn't shift much in price anyway.
What actually works better is patience. I've noticed the solar panel prices drop naturally through autumn as demand dips. Picked up some Renogy panels in September for less than the Black Friday "deals" were asking come November.
If you're after inverters or batteries, that's where you might see actual savings. Keep an eye on the specialist suppliers rather than Amazon—they tend to do genuine discounts. Fogstar sometimes bundles stuff at decent rates around this time.
My honest take? Don't buy something just because it's on offer. I see folks on here grabbing dodgy MPPT controllers because they were marked down 40%, then they spend months troubleshooting them. Stick to what you actually need from brands you trust.
For narrowboats especially, space is tight so every component matters. Better to save up and get proper quality than have regrets living with it full-time.
What're you lot after? If you're looking for specific bits I can probably tell you what's worth waiting for versus what to grab now.