![]() Therefore, your 5.6 hour runtime would already be reduced to 3.6 hours. As such, your UPS would only deliver 80% of its capacity to the wall-warts, and the wall-warts in turn would only be able to use 80% of that energy, so you’re losing 80% * 80% = 64% to power conversion inefficiencies. ![]() Lacking any other information (and, should you have it, please provide it here so we can make more accurate calculations), we could use 80% as a ballpark efficiency figure for both the UPS and the wall-warts. For instance, the 80 Plus standard for PC power supplies requires a minimum of 80% efficiency (and when they meet higher standards, they get awarded progressively higher certification levels like 80 Plus Bronze, Silver, Gold, Platinum and Titanium). There’s also an implicit assumption that the power converters involved (in the UPS and the wall-warts) do not consume energy for their operation.Įven assuming the stated capacity is right, note that you’ll need to convert the DC voltage of the batteries to AC, which is later converted to DC again at the wall-warts for the router and monitor. Of course this is merely an upper bound on the runtime, under the assumption of 100% efficiency in energy conversion, new and fully charged batteries with the stated capacity (certainly not true for, say, many Chinese manufacturers of 18650 cells which claim absurd capacities like 10 Ah). Dividing one by the other, you would get about 5.6 hours of runtime, so your 10 hour figure is already off by a large amount. Your router presents a 6 W load and your monitor a 24.7 W load, so a total of 30.7 W. Though it is probably 12 V lead-acid, you should state it clearly just to be sure.Īssuming this is correct, then you have approximately 173 Wh of capacity. A critical piece of information is missing here: battery voltage.
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