I'd love to have solar on our house, but it's rented, not south facing and doesn't have a huge surface area to work with being a terraced house.
But honestly I'd be happy if I could make around 500w average as that cover the bulk of my electric usage, pretty much always using around 500w 24/7 due to fishtanks and my server.
Probably save us around £700 or more a year in electric.
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It's tricky if you are renting unless you can do some deal with the landlord. They won't want you connecting such things to the house electrics. It might be possible to do a solar rig in the garden with batteries than can supply an independent circuit, but it needs some care. I expect you could run pumps from 12V dc, but you need an inverter for anything ac.
It could be a good investment for landlords to install solar as they could offer discounted electricity whilst taking some of the gain for themselves.