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There are more ways to address this than just solar power.
How is it powered at the moment? A mechanical pump may need a manual back-up to cope with break-downs. This may reduce the level of service but can at least provide short term minimum supply.
The other thing is storage. Increasing storage will help smooth out supply and demand unbalances. If the downtime is going to be about a day, then have a day's extra storage. Having several smaller tanks will help manage the storage and allow for maintenance. Also have storage at home - that can also provide a good buffer
hope that helps