Of course it is not acceptable to have such a limitation or care. But as the number one issue of these nMPs is their GPUs (most of the times because of stressing them and overheating, video editing involved etc) it is wise, as long as
vddobrev has other priorities for his work to just know about what is possible to cause him problems.
This is not that we do like to care for not stressing the GPUs, but we have to be careful (given the many reports of failures) to do our work for as long as possible, and overcome Apple's design problems.
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Do you have a limitation to what amount of money you can afford?
Also are there any other devices to connect to UPS? (to calculate the load capacity)
Of course a pure sine wave UPS is preferable as
Kris Kelvin and MarkJames68 already stated...