Power Supplies

Built for HAM Radio, CB Radio, HF Radio, Shortwave Radio or a Linear Amplier

Also Great for LED Lighting

and as an RV Battery Charger

100 Amp 200 Amp 400 Amp or more

30 Amp 36 Amp and 50 Amp too


This Is The MegaWatt® Website

Don't Get Stuck With An Offshore Clone

New Fan Circuit in the S-350-12 and S-400-12 Makes the Fan Run Almost Totaly Silent.

The S-700-12 Is Now 10bd Quieter


30 amps 33 amp peak

15.5 VDC

Adjustable Voltage on this unit is 9.5 to 15.5 VDC

Input 120/240 VAC



36 amps 41 amp peak

15.5 VDC

Actual voltage adjustment on this unit is 9.5 to 15.5 VDC

Input 120/240 VAC



50 amps continuous at 14 volts

Will run in parallel with as many units as you need for 100 amps or more.

Adjustable voltage 10-14 VDC Output 690 Watts

Input 120/240 VAC


Four S-700-12s Running at 200 Amps 14 Volts

Purchase At The Bottom Of The Page

S-700-12: 100 Amps 200 Amps 400 Amps or more read here:

50 Amps Continuous at 10-14 Volts Heavy Duty DC Power Supply. Adjustable Voltage From 10 to 14 Volts DC Output 690 Watts. Great for 13.8 volt equipment, all MegaWatt Power Supplies are highly filtered and regulated. New 1/2 Volume Fan Circuit 10db Less Cooling Fan Air Noise.

All power supplies are modular. They will run In Parallel with other like power supplies to produce any amperage you want.  You can also run them in searies to produce any voltage.

All our fans run very slowly full time to stop heat cycling which is the main cause of power supply circuit board failure. See videos for an example. All power supplies come with a grounded 110 volt power cord.

Links to other website reveiews




Output S-700-12

These Power Supplies also have many other uses. The S-350-12 and S-400-12 work great as onboard battery chargers for RVs with one standard battery also cars and trucks. Keep your car battery fully charged and operate all your 12 volt equipment while parked. They will charge a low battery at full capacity and slowly ramp down the charge amperage to a 2 amp trickle charge as needed. Great for cars that are rarely driven.

They can be used to power LED lighting systems, RC Car, Airplane and Helicopter Mobile Battery Chargers in the house. They are widely used as LED Driver Power Supplies, Servo Control Power Supplies for CNC and Robotics or just prototyping and projects requiring 9.5 to 15.5 VDC power.

Both S-350-12 and S-400-12 power supply dimensions are 8 1/2in long X 4 5/8in wide X 2in tall .

The S-700-12 is 9.5in long X 5in wide X 2.75in tall .

 All power supplies come with a grounded 120 volt power cord and instructions.

You DO NOT need a PayPal account to check out

How to check out using PayPal with or without a PayPal account or get a shipping quote. Paypal is all HTTPS protected. 

1. Click the buy now button under the power supply picture, it may take a few seconds for PayPal the load.
2. Enter how many power supplies you wish to purchase and press continue.
3. If you don't have a PayPal account and don't want to get one please click the "pay with debit or credit card button"
4. Enter the appropriate information and click pay now.

For a shipping quote skip step four, pick your state or your country in the address field. Click the arrow by shipping method. This will give you the shipping price without actually making a purchase.

 $12.00 shipping to the USA

for the S-350-12 or the S-400-12

$15.00 for the S-700-12

IIf you are purchasing large quantities check with us for a shipping quote. 

To check shipping costs to other countries click the buy button and enter your country.

Privacy: All information exchanged or received on this website is 100% protected and is never shared without written permission.

Thanks to


and also  to


S-350-12 30 AMP 33 Amp Peak

9.5 to 15.5 Volts DC

UPC 683405633754

Orders over 10 units will not be processed without contacting us first about shipping


S-400-12 36 Amp 41 Amp Peak 9.5 to 15.5 Volts DC

UPC 685256290230

Orders over 10 units will not be processed without contacting us first about shipping


S-700-12 50 Amps Continuous Adjustable Voltage 10 - 14 VDC

UPC 703510623126

Orders over 10 units will not be processed without contacting us first about shipping


MegaWatt vs Clone Test Video

Four MegaWatts 200 Amp Test Video

Owner: John Marles

MegaWatt Power Supplies

31700 Tick Canyon Rd

Agua Dulce, CA 91390

Free 1 to 3 Day Priority Shipping Upgrade on Every Purchase

We also have the:

33 Amp and 36 Amp Heavy Duty Power Supplies. - Adjustable 9.5 to over 15.5 Volts DC Output. Great for 13.8 Volt Equipment. Full Output is 15.5 Volts Not Just 12 Volts.

All payments are made on a fully secure HTTPS webpage

This is a demonstration only. Do not run your

     S-700-12s over 14VDC while in parallel