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John C
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I found this store. They seem to have lots of invertors. I would like to purchase one to run my wireless Audio Technica mic for about 5 or 6 hours. Can someone recommend a good solution?

http://www.theinverterstore.com/

Thanks,

John Cesta
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Donald Dunphy
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Hi John -

What wattage is your mic system?

You probably want to buy an inverter just a little bit above that (in numbers), unless you plan to plug multiple items into it.

For example, most people using a laptop that is less than 75 watts, only need an inverter that goes up to 75 watts. They don't need a massive inverter that does hundreds or even thousands of watts.

- Donald
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John C
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It's 12 vdc 500 ma Just want to plug my AT 700 series into it for about 5 hours to do a little magic in the street.

John
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Donald Dunphy
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Got this elsewhere on the internet:

Quote:
The conversion of Amps to Watts is governed by the equation Watts = Amps x Volts

For example 1 amp * 110 volts = 110 watts


500 ma is .5 amp. So .5 amp * 12 volts = 6 watts. Not much needed.

I think that's right. Maybe someone who also knows will double check my work.

- Donald

P.S. What are you connecting the inverter to? Directly to a battery source, or to your car, or ???
Donald Dunphy is a Victoria Magician, British Columbia, Canada.
John C
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Ok, I'm a d--k (that can be taken two different ways, It's not meant to be the Detective type)

I guess what I should say is that I am looking for a PORTABLE POWER source for my wireless mic system. Do I then just need a battery?

John
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Donald Dunphy
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All an inverter lets you do is convert AC to DC. People typically use it to plug their notebook computers and portable TVs into their cars / motor homes, although it has other uses.

Are you sure your mic system really 12vdc?

- Donald
Donald Dunphy is a Victoria Magician, British Columbia, Canada.
John C
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Yes, of course the entire unit plugs into the AC power. But on the receiver it reads 12 vdc 500 mA

John
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TheAmbitiousCard
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John,
I think it is not just the Watts you need to be interested in. I think you need to carfully look at how many Amps (or amp-hours) the inverter can "deliver" (i'm not sure what that word should be). Look and see how many amps your equipment uses and make sure the inverter you purchase can handle it/deliver it/or at least brag about it.

I'm not an electric expert but I'm pretty sure that has something to do with how long the inverter will be able to deliver those watts.


if you're equipment uses 13 amps when you add up mic/PA/etc. and you want to do a one-hour show, the inverter better be rated at 13 amp/Hrs. or something like that.

Maybe the magic roadie will chime in and put me in my place... Smile
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TheAmbitiousCard
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I just read part of the FAQ. Some very interesting info there:

audio equipment, satellite systems, and video equipment, sound and look cleaner using digital pure sine wave inverters.

You can use the following formula to determine the size:

Volts * Amps = watts

or

Watts / Volts = amps

1250 Watt example:

1250 / 120 Vac = 10.41 amps ac (typical number found on equipment)

PS: the bottom of the FAQ page has a calculator that calculates exactly what I was talking about up above.

Please note that you will need a battery too. The inverter is jsut an inverter, it appears.
Very interesting.
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Eldon
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Most home stores and a lot of other places sell inverters with rechargable batteries built in. I use one of these to run my Passport sound system and wireless mic when it's hard to get to power. The battery last for hours. See link for example. http://mendelsons.stores.yahoo.net/tojustrewi40.html
Donald Dunphy
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Good idea, Eldon. I hadn't thought of that sort of inverter, when talking about inverters.

In Canada, you can find that sort of thing at a Canadian Tire Store. They sell them primarily so people can jump start their cars, when the battery is dead. Of course, they have other uses.

- Donald
Donald Dunphy is a Victoria Magician, British Columbia, Canada.
John C
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Yea, that's what I had in mind. Thanks Eldon. Thanks Donald. Now I have to find one.

John
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Donald Dunphy
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They might have them in the automotive section at a store like WalMart.

- Donald
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sethb
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John -- Take a look at these units, they seem to be a pretty good deal for the money, click HERE for more information.

I have not actually used one and so have no opinion about them, but they appear to be compact (if a bit heavy) packages, with the battery, inverter and charger all in one unit. And they are available in 200, 400 and 600 watt versions. SETH
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John C
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Yea, those do look quite nice. I'll have to find out how long the Xantrex 852-0200 XPower Powerpack 200 Plus Portable Backup Power Source will run my wireless mic receiver.

Thanks for that. I have a peavy solo and a crate lime amp, both operate on battery power. So, I just need a batter to operate my wireless mic. I don't want to have to purchase a new amp with battery for both.

These units look like they will do the job and small and light too.

Product Dimensions: 9 x 12 x 6 inches
Shipping Weight: 16.6 pounds

Thanks again.

John
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sethb
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John, although I'm still trying to dope out the specs myself, apparently you need to see how many amps your receiver draws. Then you look at the "amp-hours" (AH) rating for the power supply, and that will tell you approximately how long the supply will power the unit.

For example, my portable 30-watt PA draws 1.5 amps. Since the Xantrex 200 is rated at 12 amp-hours, then theoretically, it should run the PA system for about 8 hours. The Xantrex 400 is rated at 20 amp hours, and should run the system for about 15 hours.

At least I think that's how it works, but I'm a magician, not an electrician! Maybe the Magic Roadie or other tech-oriented people can chime in here and help us electrically-challenged folks out. SETH
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Dan McLean Jr aka, Magic Roadie
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Hi, gang!
I don't know much about inverters, especially the very inexpensive ones being discussed here, so rather than clutter the thread with under-informed conjecture & hearsay, I think it's better if we just wait for someone with correct answers.
Cheers!
Dan McLean Jr
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TheAmbitiousCard
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Yes, that's the idea sethb.

I have one of these and I used it with my PD-150 at a show I did at a park and it worked just fine.
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g0thike
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Here I go Again,

Invertors will work on some electronics but when its power a wireless microphone that low end models will cut off- buzz since they are not a "Pure Sine" wave.

Do a "SEARCH" you will see what I mean.

You can get a Pure Sine invertor but they are 10 times the cost of the low end invertors.

I am not sure if the Invertor from Fender used to power the Passport systems are Pure Sine Wave, it might be an afforable opition.

G0THIKE
TheAmbitiousCard
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Yes, Gothike, I noticed that on the website that john originally posted.
they discussed the pure sine wave options. that would be the one to get.
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