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Samlex 12v 300 Watt Pure Sine Wave Power Inverter PST-300-12

Was: $199.00
Sale Price: $164.49
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Product InformationStore Part Number: PST-300-12


The PST-300-12 Converts 12VDC to 120 VAC

Samlex offers superior quality Pure Sine Wave AC-DC power inverters for many different applications. offers PURE SINE WAVE (aka true sine wave) that provides high-end specialty users power portability for sensitive electronic equipment. The clean power delivered by a Pure Sine Wave is of the same quality and efficiency as the power provided by your utility company, which is not the case with the cheaper and more popular modified sine inverters.

The 12 volt PST series inverters can withstand dc voltages of up to 16.5 volts which means that they are compatible with highvoltage dc charging-such as solar charging and equalization charging.  Because of the heavy duty chassis, the PST-300-12 is able to cool itself via convection, which allows for less fan run time-leading to longer fan life and less no load draw. 

We highly recommend the use of Pure Sine Wave Inverters to power Computers and related peripheral devices; i.e. printers, optical drives, laser copiers, and if in doubt check with the manufacturer of your equipment.

Other devices that benefit when Pure Sine Wave power is used are variable speed control motors using solid state circuitry, Audio Amplifiers, Digital Clocks and Radios, Medical Equipment, Microwaves, etc.


  • High efficiency
  • Temperature controlled cooling fan – reduces energy consumption
  • Low interference Wide operating DC input range: 10.5 - 16.5 VDC
  • LED indicators for power and protections
  • Low idle power draw
  • Dual GFCI protected AC outlets
  • Commercial grade design suitable for heavy duty loads, long periods of continuous operation & for emergency back up
  • UPC – Universal Protection Circuit: low voltage, over voltage, over temperature, over load and short circuit
  • Detachable cable with 12V plug adapter
  • Detachable cable with battery clamps
  • Safety certified to UL standards, FCC compliant


PLEASE NOTE: Many electrical devices require a good deal more Watts to start or energize than is required run once started. For instance an electric device may require only 250 watts to run but may need 800 watts to start. Please check with the manufacturer of your equipment to obtain minimum watts for starting operation of the equipment or device.

Tech Specs

  • Dimensions (LxWxH): 9.69 x 5.76 x 2.58 in
  • Weight: 3.46 lb
  • Shipping Weight: 6 lb
  • Output Voltage: 120VAC ±3%
  • Maximum Output Current: 2.54A
  • Output Frequency: 60Hz ±1%
  • Type Of Output Waveform: Pure Sine Wave
  • Total Harmonic Distortion of Output Waveform: <3%
  • Continuous Output Power (At Power Factor = 1): 300 Watts
  • Surge Output Power (At Power Factor = 1; <1 sec): 500 Watts
  • Peak Efficiency (At Full Load): 88%
  • AC Output Connections: NEMA-20R GFCI Duplex Outlets
  • Nominal DC Input Voltage: 12V
  • DC Input Voltage Range: 10.5 - 16.5 VDC
  • Maximum Input Current: 40A
  • DC Input Current at No Load: < 500 mA
  • Model: PST-300-12
  • Manufacturer: Samlex
  • DC Input Connections: Tubular Type Screw Down Terminals
  • Display-Led: Power, Abnormal
  • Low DC Input Voltage Alarm: 10.5V
  • Low DC Input Voltage Shutdown: 10V
  • High DC Input Voltage Shutdown: 16.5V
  • Short Circuit Shutdown: Yes
  • Overload Shutdown: Yes
  • Ground Fault Shutdown: Yes
  • Over Temperature Shutdown: Yes
  • Reverse Polarity on DC Input Side: Yes
  • Cooling: Forced Air Temperature Controlled Fan
  • Safety: Intertek - ETL Listed. Conforms to ANSI/UL Standard 458.
  • EMI / EMC: FCC Part 15(B), Class B
  • Operating Temperature Range: 0°C-40°C
  • Warranty: 2-Year
  • Manufacturer Part #: PST-300-12
  • UPC: 622988072130

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Reviews and Ratings

4.80 Average
5 Stars 4
4 Stars 1
3 Stars 0
2 Stars 0
1 Stars 0
Rated 4.80/5 Stars from 5 customer reviews.

Do you own the PST-300-12? Please, tell us what you think about it. It helps us provide you with better products. Please note that it may take up to 72 hours for your review to appear.

Samlex PST 300 12
Pros: Small enough to mount inside a car, powerfully enough to keep laptops, iPhones, and a GPS going with a powerstrip connected to it. Fan is very quiet
Cons: Wish it had a volt meter on it, other than that, none.
We used this to keep my daughter happy on an 18 hour drive. Kept the laptop charged so she could play some games and watch DVDs . Was a great babysitter :-)
Is this review helpful?
Written by on Mar 31, 2014. Ownership: Just Bought. Knowledge Level: AC/DC is more than a band — (90 of 177 customers found this review helpful
Just what I wanted
Pros: Use this inverter at a cabin and so far no problems with the devices I have used. It looks like it should last a long time.
Cons: None
Is this review helpful?
Written by on Mar 19, 2014. Ownership: Just Bought. Knowledge Level: Electricity doesn't scare me.. usually — (94 of 175 customers found this review helpful
solex 300 watt pure sine wave inverter
Pros: For 300 Watts of pure sine wave electricity to run my sensitive electronics this was a great purchase. Comparatively for what i was looking for it was the obvious choice.
Cons: The only bad thing is the very loud siren that sounds when power from my undersized (soon to be oversized) battery bank drops below 12volts. It serves its purpose well. i am just a whiney consumer in this aspect.
Is this review helpful?
Written by on Jul 20, 2014. Ownership: Use regularly. Knowledge Level: Genius is my way of life — (89 of 169 customers found this review helpful
PST-300 In a tent
Pros: Excellent sturdy construction. Fairly easy to use even by electrical dummies like me. Very impressive customer support from Samlex! Needed to know how to use this device in a small camping trailer and tent camping using solar maintained deep cycle battery. Called Samlex and questions were immediately answered by a Samlex engineer who answered them in such a way that even an inverter dummy like me could understand.
Cons: None
A simple "product use for dummies" manual might come in handy!
Is this review helpful?
Written by on Jun 30, 2016. Ownership: Use regularly. Knowledge Level: I know what an outlet is — (6 of 12 customers found this review helpful
Great manual
Haven't used the inverter yet, but I'm thoroughly impressed with the manual. Most products nowadays have a "manual" the size of a match book. The Samlex manual is thorough, detailed, concise, and explains in simplified form the considerations in wiring and using their products. Though not an electrical engineer, I have an extensive background in electronics, radar, and diagnostic medical imaging. While the average person may get bleary-eyed from reading it, I found the manual refreshing in its completeness and that it left no unanswered questions about the inverter. If that much thought and consideration went into the manual, I'm totally confident that the actual product will be of equally high quality.
Is this review helpful?
Written by on Aug 22, 2019. — (2 of 4 customers found this review helpful

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