Too expensive, it will never be cost effective and pretty jank.
For example, you can get a 13kwh battery (usable) for the same price as that.
Pair it with an inverter for about £1k and you are covered on the battery storage. Take it with you when you leave but you’d still need an electrician to install it and a time of use tariff to make the most of it.
You could also go down the eco flow stream route, that is far more cost effective. £90 for a 800w micro inverter that can support 2 panels. In Germany you can plug these into a standard wall socket, in the U.K. you can’t.
The issue you have is a lot of the cost in installing solar panels is compliance related. You need to use an MCS installer if you want to export energy and you don’t really get the full benefit without being able to export when it’s sunny. You need to get permission from the DNO if you install an inverter >3.6kw and you need to notify them if it’s below that level.
You can go down the self install route but in order to get the kinds of benefits you’d expect from a solar set up, you basically have to install something a pro would install. Most people have self installed on here already had an MCS certificate from another install which they have ‘hidden’ behind and therefore benefit from export.
As a side note, a janky ‘temporary’ install is likely to put off perspective buyers, panels tend to need to be mounted to something solid as otherwise they’ll blow away. Trailing cables across the floor is a no-no and pretty dangerous, particularly DC cables.
