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Gear / Technical Help => Remote Power => Topic started by: AndrewD300 on March 03, 2004, 07:45:22 AM
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Hey everyone,
I have a Behringer UB802 that I use for professional live taping situations when I know I'll have a power source.
My question is:
How can I power the 802 using batteries? Can it be done? Where would I buy everything, and how much would it cost? I'm somewhat clueless as to how to power something using batteries that runs off AC power only. Thanks for any help you can give me....
Andrew
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you would need a power inverter, and would have to carry something similar to a car battery to have enough juice, i think it is something like 3 to 1 when converting dc to ac like that, maybe 2 to 1
how many volts is the input?
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According to the product specs, power consumption is 17W, and Mains Voltage is 115V.
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DC-> AC conversion for most inverters is 3:1 meaning for every 1amp AC you use 3 amps DC.
17/115 = .148 amps AC X 3 (conversion efficiancy rate) = .44 amps DC
call it .5 amps to be safer.
I think this is pretty doable actually if you'd want to do it.
a 12 volt 7 ah battery would run it easily for 10 hours. The most important thing is to find out the conversion efficiancy of the inverter.
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Before dropping a wad on portable AC, you should consider a $99 Behringer MXB1002, runs off two 9V, and 18V phantom power off a third 9V battery. Sounds just as good as a UB802, and is actually more versatile. It's got 5 mic pre's, and it can be configured to have a discrete output for each preamp (two inserts, 2 main outs, and 1 pre-fader aux). Not all mics can run off 18V phantom, but many can. It's probably easier to just get dedicated portable phantom power units if your mics really need 48V. The only other battery-powered mixer I know of is a Samson Mixpad 4, costs more, does less.