|14 Oct 2010||#1|
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Battery Backup Systems Or UPS - 2 Batteries - In Series Circuit - Bad?
Hello. I have a question about battery backup systems or UPS where now they have a sealed pack of 2 numbers of batteries as 1 battery.
I know that having a second battery will increase either voltage or capacity, depending on how they are wired. Hooked
up in series will increase the voltage, so if a battery is 12V, then your will have a 24V system or unit. Parallel wiring will increase the capacity and thus run-time.
Now, if the the 2 connected batteries ARE tied together as one unit, and the batteries ARE wired in a "SERIES" circuit, HOW CAN 24 volts ANYWAY improve run-time versus 12 volts? (BECAUSE THAT IS HOW I AM FINDING THEY ARE WIRED -- IN "SERIES"; IT DOESN'T MAKE ANY SENSE.) Can it provide ANY positive effect to run-time? Doesn't it REALLY NEED to be wired in PARALLEL in order to increase run-time?
|My System Specs|
|15 Oct 2010||#2|
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I have come to a conclusion after reading and speaking to people. There is no difference between the different circuit runtimes. I was failing to see that both series and parallel circuits have the runtimes when converting from DC to AC. I was getting hung up on the differences between volts and ampere effect on runtime. However during runtimes, I found that the cells discharge twice as fast alone in a parallel circuit to get the same amount of amps at 120 volt output (required for AC) than a series circuit. However, comparing total runtime to discharge between a parallel and series circut -- they would be the same total runtime.
So there are two factors that I failed to realize: 1. There is an inverse realtionship between amps (flow or volume of current) and volts (pressure or strength of a flow or volume of current). So if I am trying to evaluate one or the other measurements because of this inverse relationship there, there was never any constant for me to do so since they are opposing each other -- so it cannot be done. 2. I was converting from DC to AC current (What happens in a UPS during power loss.) so there was a constant I had to relate to household voltage (120 volts) -- both kinds of circuits have to be in agreement when the constant is nominal house voltage (AC need to power your compoents for power loss. Being that the AC is what is end energy being used (1 amp at 120 volts), both kinds of circuits have to produce the same total power. Either way you would get the same 120 volt run time.
This required some research and thinking!!!
You need to draw 10 amps from a 12 volt system to get 1 amp at 120 volts. You need to draw 5 amps from a 24 volt system to get 1 amp at 120 volts.
|My System Specs|
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