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Need a power supply for the brookstone sound machine 120v 7.5vdc 8 watt

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5000 watt inverter schematics circuit


If you have (90) 50w lamps = 4500 watts total. Assuming a 120/240 panel, if you put 1/2 on one "side" of the panel and the other 1/2 on the other "side" of the panel, that would be 2250 watts on each half. The generator should be rated *at least* 125% of the load; 4500w x 1.25 = 5625W. Using a 4500W generator on this load will cause it to overheat and shorten its life as it is running at 100% of capacity all the time..

One half of the panel is 120V to neutral, and the other is 120V to neutral - or 240V between both circuit breaker terminals. Ohms law for DC circuits and purely resistive AC circuits says Volts x Amps = Watts; or Watts / Volts = Amps. So, 2250W / 120V = 18.75A on each pole of a 2 pole circuit breaker that feeds the sub panel. A #12 copper wire is rated for 20 amps; but as per National Electrical Code - must be de-rated to 80% of rating which means it is good up to 16 amps maximum. A #10 copper wire is rated for 30 amps, but it too must be derated to 80%, making it good for 24 amps maximum. So, if you are going to feed a sub panel supplying (90) 50watt lamps, you will need to run a #10/3 copper cable from a two pole 30 amp circuit breaker at the generator to a 120/240 volt "main lug only" sub panel rated for at least 30 amps.

Divide your load evenly across the sub panel - (4) 15 amps circuits via (2) two pole 15 amp circuit breakers on each "side" of the panel if you run (2) 14/3 cables out to the lights - or (4) single pole 15 amp circuit breakers if you run (4) 14/2 cables out to the lights. No circuit breaker terminal should have more than 23 lamps that means you have (2) w/ 22 lamps and (2) with 23 lamps. The circuit w/ 23 lamps will draw 23 lamps x 50w = 1150W. 1150W / 120V = 9.6A. The 22 lamp load will be 22 x 50w = 1100W. 110W / 120V = 9.2A. Which is well within the 12A maximum allowed (after derating as required by code) by a #14 copper wire rated for 15A.

Good luck!

Mar 10, 2014 | Electrical Supplies

1 Answer

Need a power transformer from 220v input to 120v output


Yes, you need a step down transformer. These are often rated in watts (the power rating is the same on both sides of a transformer) so it is easy enough to match this with the power consumption of the stereo. Apparently you will need about a 4kW transformer eg

http://www.220converters.com/store/p/45-Simran-THG4000-4000-W-Watts-Step-Down-Voltage-Converter-220v-to-110v-Transformer.html

Ugly things.

Jun 23, 2017 | Crest Audio CC5500 Amplifier

1 Answer

Need a power transformer from 220input to 120output


What you need is simply a power converter device that knocks the power down for your device. Look for a UK (European) to USA power convertor on somewhere like Amazon.

May 04, 2013 | Bose Lifestyle SA-3 2-Channel Amplifier

1 Answer

Here in Australia we have different power sockets and power supply As I understand the machine I have has 120V 60HZ 1025 W What do I need to use it here in Australia? Do I need a new plug or a...


good day.

first,the power socket,,try to see the power plug of your machine and the power socket you have..compare it..when its compatible no need to replace,,if not you need a socket adapter.or if not available buy a new plug (if your plug is not compatible to the socket)

secondly,you don't need a transformer if your ac supply in Australia is 120v..
if the supply in your place bigger than 120v...like 220v,230 or 250v..you have to use a step-down transformer with input of what you have in Australia and the output is 120v..and of course pay attention for the wattage of transformer to avoid over heat or burn..I suggest to buy 1500w...

thank you and good luck

Apr 07, 2011 | Microwave Ovens

1 Answer

Need to convert 120V AC/DC current to 120V AC 60Hz 15W


there is no such thing as "ac/dc" current-its either one or the other--if its a 120 Volts then chances are it is AC already-at 60hz---the 15 Watts or any Watts is the amount of draw from the unit-not the power supplied to it- Watts= Volts(supplied)/Amps(being used) if you only want to supply 15 watts then reduce the amps (with a fuse) to .125amps

Mar 26, 2010 | Computers & Internet

2 Answers

I need to install a power converter in my truck.Can any one help me with the basics? Please get back to me. Keith


What is it exactly that you want to accomplish? It looks like this unit is powered by the electrical system of your truck, but if it indeed can provide 2500 Watts of output power, its input demand from your truck electrical system will be in excess of 200 Amps!!! You'll need some pretty hefty wiring to support that type of demand, and I doubt if your alternator can put out that amount of current.
Are you sure you want/need to do this - and run it off your truck electrical system?

Sep 22, 2009 | Xantrex Technology DPS350KB 2500-Watt...

2 Answers

Do I upgrade my Power Supply


A new power supplu can't hurt anything so long as it's right for your Dell. Some Dells with ATX power connectors are wired in a propiretary way. Make sure which way yours is wired before making the buy.

May 06, 2009 | Dell Optiplex GX260 Desktop PC - Intel P4...

1 Answer

Motor trend 2400 watt inverter has 147 VAC from both hot and Neut


Assuming you are testing alternating current and not direct current that sounds quite normal. Plug with confidence. You are using equipment designed for 110v-120v and you're getting 113.8v where it matters most. Higher voltage to ground is nothing unusual, that's just how this inverter is designed.

Jan 10, 2009 | TREND Motor Trend Inverter 2400 Watt ...

1 Answer

Have to change power input from 120V/60Hz to 230V/50Hz


ok " check the net for plug and power converters that plug in to
Singapore receptacle

Had a set for Europe worked great

Jan 22, 2008 | Miele CVA2660 Stainless Steel Coffee Maker

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