Tangled Metal wrote:The input into the charger is 230v but the charger gives it 5v via each USB socket. If your battery pack takes two USB inputs that's 2x5v = 10v in?
No. Your better off considering each USB inputs separately. So, for example input A is 1 Amp - 5 x 1 = 5 watts, input B is 2.1 Amp - 5 x 2.1 = 10.5 watts, giving a total of 15.5 watts.
Tangled Metal wrote:I'm trying to work out if there's a faster way to charge. So using a high watt rated charger with multiple output sockets. If they're all being used then what is the likelihood that the two sockets feeding the battery pack isn't giving it as much energy as it could be taking thus increasing the time to charge?
Depends. USB charging devices will only consume up to some maximum current, some may be limited to a maximum of 1 Amp - the older standard stipulated a 1 Amp max, some might take up to 2 Amps... what your devices will take depends on there ratings and the state of the battery. One device may become fully charged before the other devices, so its USB current will decrease to virtually 0 then.
If 4 of your devices want to take 2 Amps each ... 4 x 2 x 5 = 40 watts .. and you have a 30 watt charger .. then it will not charge as fast as a 40 watt charger, but a 60 watt charger will not gain any time over the 40 watt charger.
Too many variables. If you want fast, and simple calculations - assume everything is flat and taking its maximum charge. Get a USB charger with that many USB sockets, and at least that much power. Some consider a more powerful charger will be more reliabler than a charger better matched to the load, this is because it will run cooler and place less stress on its internal components.
Tangled Metal wrote:Is it best to charge one thing at a time or load it all up?
Your 'best' may not be my 'best'.