You can buy Battery Banks which can be charged from solar panels to store the energy but these are not cheap. Out local community hall is going through an investigation of solar panels and I get the odd question put to me.
https://www.solarguide.co.uk/solar-batteries#/
Rectently I was asked about the viability of using a Battery Bank to power the heating in winter in the event of a power cut. The hall has a 7.5Kw air source heater and during the winter when the SCOP is low the load on a Battery Bank could well be 7.5Kw. So to keep this running for just an hour would require a Battery Bank that's going to cost a few thousand pounds just for a hour or possiby two. Then of course the re-charge time in winter on Skye would be lengthy when we only get just over 6 hours of somewhat dubious daytime.
Of course the Solar Panels would supplement the energy source at other times, adding to the green credentials of the hall.
Since the scheme is going to be funded by grant, money may not be a problem except that I would expect any organisation funding this may well want to see what the return on investment would be to know their money is being spent wisely.
On a slightly different note: Conventional gas/oil boilers have relatively low electical power requirements for the controls. Its conceivable to power these from a leisure battery and inverter. You just have to get someone who knows what they're doing to wire this in as an option.
Some people here have small generators just in case a lengthy power cut occurs.