How Much Backup Power Do I Need?

List essential devices, note running watts and any startup surge, then estimate how many hours each must operate. Energy demand is approximately watts multiplied by hours.

Start with watts, then add time

Real systems need margin for conversion losses, battery limits, surge loads and uncertain runtime.

What to ask next

What is the claimed energy source? Where is the system boundary? What has actually been measured? Can an independent investigator reproduce the result? Those questions prevent terminology from substituting for evidence.

For the product-specific application of these ideas, see our Moray Generator review.