There is only one way to fight this
You have to have an inverter and a few batteries.
The inverters provide a seamless switchover from local power to your battery power.
However, if business is that important, then you should also have reliable, standby power in the form a a small genset. How large or small that will be depends on your living style and house. Anything over 6 Kilos should run a medium sized house. We are talking diesel, of course. You can figure in the neighborhood of RD$100K for a good one. There are used ones that will give years of service if properly maintained.
Cordially,
HB