Hours ≈ battery Wh ÷ the modem+router (+ONT) stack’s named watts. Cite ARRIS / NETGEAR / ASUS / TP-Link / Nokia figures. DC mini-UPS vs AC portable power station—arithmetic only, not an uptime test.

Hours ≈ battery Wh ÷ the chest freezer’s cited running watts (or V×A from the rating plate). Size continuous AC and surge for compressor start—EnergyGuide kWh shows duty cycle, not a lab overnight test.