Solar BACK UP kit not full time OFFGRID ? help please?

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NR - if you already have an 80W panel and 10A controller, you're practically there tbh. Unless you go for a mini usb solar charger, I'm afraid you have to connect a battery, even a really small 12v one, to the controller for it to initiate properly and get a reference voltage. This should prevent an over voltage situation with whatever is attached. Small 2.1ah alarm back up batteries might do the trick for you. Otherwise, you may consider a 10W panel with diode option that will give a direct connection of about 0.9A on a good sunny day? Problem with these is that the voltage range on a lot of 12v solar panels can go up to 17v and could damage an attached unit that doesn't like anything above 12v - 13v eg some cctv cameras where a regulated supply is an absolute must! I suppose, thinking about it, if you did have one of these 10W trickle charge panels and connected a 12v car power adaptor it may regulate some of that voltage range for you as it would have to cope with a vehicles higher charging voltage as well. Without trying it myself first I wouldn't really like to recommend it though.

Personally, I'd play safe and go for a small alarm battery to utilise what you already have and connect your hub to that. The battery should act as a voltage regulator and get everything working properly. Don't think of it as stored energy but as an essential part of the system. If it needs to be portable, there's a good range of light weight flexible pv panels that roll up but are more expensive.

The above set up should also provide enough energy to power a suitable 12v pump to shift some water. It'll simply be down to finding the right pump with enough oomph to satisfy your 3m height criteria.