Timothybil
Flashlight Enthusiast
I live in an area where power outages, while not common, occur frequently enough that I need to have alternatives available. I have my light an heat situation under control, but am still working on my computer & communications.
I have a nice APC UPS that works just fine to protect my desktop system, my DSL modem and my Wi-Fi router. If power goes out I can shut down my desktop and survive with my Android table without too many problems. The only drawback is that even when I shut down my desktop PC, the UPS will only run the modem and router for a couple of hours. Together the need 2A@12v.
I was looking at some battery packs today on line, and came up with some questions. As an example, one I was looking at seemed ideal. Capacity was 11000mAh@12v, which should be ideal. By my calculations that should provide me with about five hours of usage - 11Ah ÷ 2A = 5.5hr, right? To be conservative, maybe figure 4 hours useful life. The question is, is that 11Ah the usable capacity of the pack, or the total capacity, with some unknown portion not accessible, like the fact that one shouldn't drain a lead acid battery below 50%.
Anybody out there have any guidance to give, maybe some personal experience?
I have a nice APC UPS that works just fine to protect my desktop system, my DSL modem and my Wi-Fi router. If power goes out I can shut down my desktop and survive with my Android table without too many problems. The only drawback is that even when I shut down my desktop PC, the UPS will only run the modem and router for a couple of hours. Together the need 2A@12v.
I was looking at some battery packs today on line, and came up with some questions. As an example, one I was looking at seemed ideal. Capacity was 11000mAh@12v, which should be ideal. By my calculations that should provide me with about five hours of usage - 11Ah ÷ 2A = 5.5hr, right? To be conservative, maybe figure 4 hours useful life. The question is, is that 11Ah the usable capacity of the pack, or the total capacity, with some unknown portion not accessible, like the fact that one shouldn't drain a lead acid battery below 50%.
Anybody out there have any guidance to give, maybe some personal experience?