PORTABLE POWER SUPPLY

A Bicycle or Hand Cart Transportable Laptop Power System

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I have always wanted to put together a simple, but very useful "Portable Power Supply" for my laptop computer which would allow me to use my computer at local coffee shops in the patio area where there usually is no electrical outlets. Also, there are areas where free wifi is offered but you have to supply your own power in the form of the laptop's battery or some other source like maybe your vehicles cigarette lighter. This power supply set-up i am illustrating here is portable and can even be transported with a bicycle if you so desire. I myself will be using this system on my bicycles around town. It consists of four important components: 1. A 12VDC Automotive Battery.
2. 1 Set Battery Clip-on Adapter.
3. A 12VDC Battery Charger.
4. A DC/AC Pure Sine Wave Power Inverter.


  1. Ten-high DC/AC 150W Pure Sine Wave Inverter
    Ten-High DC/AC 150W Pure Sine Wave Inverter   Here's a reasonably priced 150W pure sine wave inverter approximately $80.00 at the date of this listing. Applicable for: 1. Solar electric energy generation; 2. Wind power generation; 3. In-car or on-boat devices series; 4. Communication equipment; 5. Industrial control system; 6. Small power supply system.

    1. Featured with high reliability and low failure rate by using the advanced double-CPU single chip intellectual control technology; 2.Pure Sine wave Output 3. Small, light and artistic, benefits from adopting the SMD paster technology; 4. Cooling fan is intellectual controlled, and its working status is controlled by CPU, which mostly increases its service life and helps to save the power consumption, improve work efficiency, and lower the working noise.

    Review By JJB. on August 12, 2014 Verified Purchase
    » I tested the Ten-High 150 W inverter and it worked as advertised. It worked fine up to 140 W and the output was a clean sine wave and the voltage output held steady at 110 VAC. Some inverters I have had will not restart if power is removed without manually resetting them. This one restarts automatically. The supplied cables are too small a gauge wire and the On/Off switch is installed upside down. I would buy another one. «
    Ten-high Inverters

  2. Power Task Battery Charger
    POWER TASK BATTERY CHARGER   This powertask might be a good charger for our purposes here.

    “PowerTask Dual Rate Automatic Battery Charger is a 12 Volt 6/2 ampere and charges 10-60 amp hours lead-acid batteries. 2 ampere trickle charge is for slow maintenance charge, or charging small 12 Volt batteries. Fast 6 ampere setting recharges 12 Volt batteries in 6-8 hours. The charger is automatic with overcharge protection to prevent overcharging of batteries. LED indicator turns from red to green when battery is fully charged, ammeter helps to keep the user informed of the charger's operation. The charger is equipped with multiple safety features such as reverse polarity protection, short circuit protection, overload protection, and no-spark safety feature.”
    Amazon Prime

  3. Battery Tender Plus Model 021-0128
    BATTERY TENDER PLUS MODEL #021-0128   This charger has a very high star rating on the Amazon.com website.

    “The Battery Tender Plus 12-volt/1.25-amp Battery Charger is the convenient solution to the challenge of keeping 12-volt vehicle batteries optimally powered when not in use. It is able to charge any lead-acid battery—including standard and sealed AGM and Gel Cell battery types and is also designed to be easy to use in difficult spaces, to utilize a 4-step charging program and safely function in a fully automatic mode. Taken together this makes the Battery Tender Plus 12-volt/1.25-amp Battery Charger an excellent means of ensuring that your battery is fully charged and ready to go when you are. 4-step charging with automatic float mode. Safe, 4-step Battery Charging The Battery Tender Plus 12-volt/1.25-amp Battery Charger is much more than a trickle charger. Powered by BTP microprocessor technology, it has a "brain". Utilizing a 4-step charging program (initialization, bulk charge, absorption mode and float mode), it allows you to simply connect the charger to a battery, either in or out of a vehicle, and forget about it until you are ready to put the battery to work. Like all Battery Tender chargers, at the end of the regular charger cycle the it automatically switches its output voltage to a safe, storage or float level that eliminates the need to worry about the damaging effects of overcharging, and the resulting need to check on the condition of the battery. If or when the battery voltage drops too far under load, output power resumes and the charging cycle begins again. The unit also features sparkproof connectors, short circuit and reverse polarity protection, an easy to understand charging status LED indicator, a quick connect harness for use in hard to reach areas and almost no current draw from batteries connected to.”
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  4. EverStart Battery from Walmart
    AUTOMOTIVE TYPE BATTERY   In my search for an appropriate portable battery capable of being transported on a bicycle i discovered that most batteries used in vehicles and deep cycle type batteries are quite heavy and not suitable for bicycle transport. However, there are some automotive batteries that might work. One such battery is Walmarts Everstart Model 26R-5-N/26-5N. This battery seems light enough to haul around on a bicycle. I also ran across someone else online who likes the weight of this battery.

    “The name says it all! The right battery for your needs is as close as the nearest Walmart store. The EverStart® battery line includes a battery for nearly every make and model vehicle, including domestic, foreign and vintage vehicles. With our Electronic Battery Selector and Battery Application Catalogs in every store, we make choosing a new battery simple. Just answer a few basic questions and these guides will lead you to the right EverStart for your car, truck, or SUV. To make your life even easier, we now offer FREE installation and battery testing at Walmart stores that have a Tire and Lube Express. Walmart also carries a complete line of Marine, Lawn & Garden, and Motorcycle batteries to keep you going, no matter what you are riding! EverStart – exclusively available at Walmart stores across the US.”
    Amazon Prime

  5. Battery Clips with socket
    ROADPRO 12 VOLT CLIP-ON ADAPTER   You will need one of these to make a connection between the Inverter and the Battery with most of these Inverters. Click on "Travel Appliances". Then click on 12-volt Accessories. This item is available on Amazon.com.

    “Roadpro 12V Battery Clip-On and Cigarette Lighter Adapter. 12-Volt "Clip-On" Battery Platinum Series Cigarette Lighter Adapter Item #: RPPSAPS. Power Your Larger 12-Volt Products with Your Battery Clips Attach Directly to Vehicle Battery.”
    Amazon Prime

  6. Aims Corporation
    AIMS POWER - POWER INVERTER   From looking at the picture and reading the technical details about this Inverter, i was hoping it would be a good quality item. But when researching this unit at least a couple of people wrote bad reviews for this brand of Inverter. One really great feature with this unit is it's ability to use either cigarette socket adapter or battery clamps. This feature is usually not available in most of these smaller units.

    “Power inverters have become a staple in businesses and homes around the world due to intermittent brown and black-outs. AIMS Pure Sine Wave Power Inverters provide reliable transformation of DC power from a battery (such as the one in a car or RV) into AC power that can then be used to run lights, computers, printers, televisions, medical equipment* and a broad range of appliances. And when it comes to selecting an inverter, it's helpful to know that AIMS Pure Sine Wave inverters represent the most technologically advanced and diverse inverters on the market to help ensure the widest use of applications. For over a decade, the AIMS Power's Pure Sine Wave Power Inverters has consistently delivered the broadest range of sizes to accommodate virtually every power requirement. To select the right inverter, first determine what devices you would need to run in the event of a power outage. Then, select the appropriate inverter that can carry the combined wattage requirements of these devices. At AIMS, you'll discover our inverters range from 150 watts up to 2000 watts – more than enough to power nearly every application imaginable.”
    Amazon Prime

  7. Wagan EL2200 Elite 180 Watt Pure Sine Wave Inverter
    WAGAN TECH   This Inverter is a pure sine wave inverter and looks just about right for laptop use.

    “About Elite Pure Sine Wave Inverters. Most inverters convert 12V DC power into 120V AC power, similar to the power supplied from your home electrical outlets. Wagan's Elite Pure Sine Power Inverters deliver AC power that is identical
    to your home (commercial) electrical power—in true sine wave form. Compared to the traditional inverters, which output in modified sine wave, AC power in pure sine wave is more similar to commercial power. The electronic appliances run cleaner, cooler, and quieter when running on pure sine power. As a result, pure sine inverters save energy costs and extend the life of appliances. The pure sine inverter also reduces electronic interference, making it a better alternative for operating sensitive audio/video equipment and medical devices. Appliances with dimmers, speed controls, and certain battery chargers may require pure sine power to operate. Wagan's Elite Pure Sine Inverters are especially designed to increase the efficiency and running time of electronic appliances and motors. Wagan Elite Inverters operate at less than 3–5% of Total Harmonic Distortion (THD) on average and 90% efficiency across the line. All of the Wagan Elite Pure Sine products are covered under a 2 year limited warranty.”
    Amazon Prime

  8. Samplex Inverter
    SAMLEX POWER INVERTERS   This brand has a good reputation. Includes cigar lighter plug and installation kit, low idle power draw LED indicators for power and protection. High efficiency with low battery voltage alarm. Protection from input low voltage, input over voltage, over temperature, over load and short circuit.

    » This high efficiency DC-AC inverter converts 12 Volts DC to 150 watts of pure sine-wave AC power at 120 Volts, 60 Hz. The unit comes with a cigarette lighter plug. Features include overload protection, low battery alarm / shut down, low idle power draw of less than 0.5 Amps. AC power is available from a single NEMA 5-15R receptacle on the front panel. «
Aims 300 Watt Inverter Nice looking Aims 300 Watt Inverter

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Website Last Updated:   December 18, 2014