Archives For Rechargeable Batteries

External Power Supplies

eiodotcom —  October 3, 2012 — Leave a comment

Today’s EIO post is on external power supplies.

 

 

External Power Supplies 101

 

External power supplies are devices that convert ac power from a wall outlet into lower voltage dc or ac power to be used directly by electronic circuits. External power supplies come in a separate physical enclosure than the end-use product, and usually provide power to the device directly through a separate cord and plug. External power supplies are used to power a variety of electronic devices, including: laptop computers, printers, cordless phones, cell phones, etc.

 

External power supplies are used both with equipment with no other source of power, and with battery-powered equipment, where the supply both charges the battery and powers the equipment when plugged in. One of the benefits of using an external, rather than internal power supply is it increases the portability of a device, by avoiding the need of internal power components. Use of an external power supply allows portability of battery-powered equipment without the added bulk of internal power components and makes it unnecessary to produce equipment for use only with a specified power source.

 

Benefits of Using an External Power Supply

Safety — External power adapters can free product designers from worrying about some safety issues. Much of this style of equipment uses only voltages low enough not to be a safety hazard internally, although the power supply must out of necessity use dangerous mains voltage. If an external power supply is used (usually via a power connector, often of coaxial type), the equipment need not be designed with concern for hazardous voltages inside the enclosure. This is particularly relevant for equipment with lightweight cases which may break and expose internal electrical parts.

Heat reduction — Heat reduces reliability and longevity of electronic components, and can cause sensitive circuits to become inaccurate or malfunction. A separate power supply removes a source of heat from the apparatus.

Electrical noise reduction — Because radiated electrical noise falls off with the square of the distance, it is to the manufacturer’s advantage to convert potentially noisy AC line power or automotive power to “clean”, filtered DC in an external adapter, at a safe distance from noise-sensitive circuitry.

Weight and size reduction — When most power adapters featured simple mains-frequency transformer-based designs, they were quite heavy and large, and added considerably to the weight and bulk of devices designed to be lightweight. Even modern power supplies are relatively heavy compared to other circuitry. Removing power components from equipment powered by rechargeable batteries reduces the weight and size which must be carried, though use of other rechargeable batteries like sealed lead-acid batteries can questionably put more weight on the equipment.

Ease of replacement — Power supplies are more prone to failure than other circuitry due to their exposure to power spikes and their internal generation of waste heat. External power supplies can be replaced quickly by a user without the need to have the powered device repaired.

Configuration versatility — Externally powered electronic products can be used with different power sources as needed (e.g. 120VAC, 240VAC, 12VDC, or external battery pack), for convenient use in the field, or when traveling.

Some of Our Products  (To see all power supply products, click here)

 

 

Velleman PSSMV7U COMPACT SWITCHING POWER SUPPLY 36W WITH SELECTABLE OUTPUT

 

Brand Velleman
Model PSSMV7U
Specifications
Supply Voltage 100 ~ 240V AC
Power 36W
Efficiency >=70%
Selectable Outputs 5 to 24V DC in steps of 1V (from 4.3 to 1.5A)
Output Plugs 2.5mm mono, 3.5mm mono, 1.0×3.0mm, 1.35×3.5mm, 1.7×4.0mm, 2.1×5.0mm, 2.5×5.5mm, 1.5×5.5mm
Dimensions 3.5″ x 1.8″ x 1.2″
Features
Features
  • with 8 detachable DC plugs
  • for notebook computers & personal digital electronic devices
  • stabilized output, low ripple & interference
  • short-circuit & overload protection
  • high efficiency & low energy consumption

 

 

 

 

 

 

VELLEMAN PSSMV3 COMPACT SWITCHING POWER SUPPLY 24W WITH SELECTABLE OUTPUT

 

This switch mode regulated power supply wall adapter comes with 4 input plugs to operate around the world. Includes input power plugs for the US, UK, Europe, Taiwan, and China! Additionally, choose from 7 different DC output connectors. Finally, a switching power supply adapter with a user selectable output plug size and polarity!

Get rid of those bulky power-hungry heat-producing linear power adapters. These switching power adaptors are state-of-the-art switch mode power supplies featuring major advantages such as:
– cooler running
– stabilized (regulated) output
– short-circuit and overload protection
– compact design
– very low idling power consumption
– multiple (selectable) voltage outputs
– user configurable output connector polarity: center (+)  or  center (-)
– world wide AC input voltage range

Features

  • 4 AC input power plug configurations included (user selectable)
    • AC plugs to fit in US, UK, Europe, Taiwan and China
  • compact switch mode regulated power supply design is light-weight and efficient

Specifications

  • AC input supply voltage: 100 ~ 240V AC, 50/60 Hz
  • output power: 24.0 watts max.
  • efficiency: > = 70%
  • user selectable output voltages:
    • 3V,  4.5V,  6V, 7.5V, 9V, and 12V DC
  • output current: 2,000ma (2 amps) maximum current consumption
  • 7 DC output connector plugs included (user selectable)
    • 2.5mm (male)
    • 3.5mm (male)
    • 2.35×0.75mm (female)
    • 3.5×1.35mm (female)
    • 4.0×1.7mm (female)
    • 5.0×2.1mm (female)
    • 5.5×2.5mm (female)
  • power supply dimensions: 4.6″ x 2.4″ x 3.3″  (11.6cm x 6.1cm x 8.3cm)

 

 

 

 

VELLEMAN PSSMV1USA COMPACT SWITCHING POWER SUPPLY 10W WITH SELECTABLE OUTPUT

 

Brand Velleman
Model PSSMV1USA
Specifications
Supply Voltage 100 ~ 230V AC ± 15%
Power 10W
Efficiency > 80%
Output Voltages 3, 4.5, 6, 7.5, 9, 12V DC
Output Current 800mA (regulated) / 1.5A max.
Plugs 2.5mm mono, 3.5mm mono, 1.0×3.0mm, 1.35×3.5mm, 1.7×4.0mm, 2.1×5.0mm, 2.5×5.5mm, 1.5×5.5mm
Dimensions 2.6″ x 1.1″ x 2.9″
Weight 3.0 oz
Features
Features Get rid of those bulky power-hungry heat-producing mains adapters.
These adaptors use state-of-the-art switching power supplies and feature some major advantages such as:
– cooler running
– stabilized output
– short-circuit and overload protection
– compact design
– very low idling consumption
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Solar Panels

eiodotcom —  September 13, 2012 — Leave a comment

Today’s EIO post is on solar panels and the different products we sell that use the sun’s energy as a power source. Before taking a look at the various products we sell, you can learn a little bit more about solar energy by reading our earlier post on the advantages of solar energy.

Sunforce 50032 15 Watt Solar 12V Battery Charger

The Sunforce 50032 is the most versatile Sunforce solar panel available on our website.  It can charge automobiles, RV’s, boats, tractors, ATV’s, electric fences, deer feeders, telemetry and more.  Like other Sunforce panels, the 50032 can charge under all weather conditions.

Suppliers: Sunforce
Max Output: 15W
Brand Sunforce
Model 50032
Specifications
Type Solar Charger / Battery
Features
Features Works with Automobiles, RV’s, Boats, Tractors, ATVs, Electric Fences, Deer Feeders, Telemetry, and MoreMaintenance Free / Easy Installation

Works in All Weather Conditions

Ultra Bright Blue LED Provides Charging Indication

Built-in Blocking Diode Protects Battery Discharge at Night

Made of Durable ABS Plastic with an Amorphous Solar Cell

Temperature Range: -40° to 176° F

Max Output 15 Watts 1 Amp

Sunforce 50012 1.8-Watt Solar Battery Maintainer

The Sunforce battery maintainer is a great device to have on hand, as it uses the light from outside to power car, boat, SUV, ATV  and PWC batteries.  It’s also simple to use, the Sunforce maintainer plugs into the cigarette lighter and can be applied to the windshield with included suction cups.  What’s great about this product is that it can charge in all weather conditions! So, if you happen to need a backup power source for your car, boat, ATV, etc. the Sunforce is a great solar panel that can keep you in power.

Suppliers: Sunforce
 Max Output: 1.8W
Brand Sunforce
Model 50012
Specifications
Type Solar Battery Maintainer
Features
Features
  • Maintains Car’s, SUV’s, Boat, ATV, PWC Batteries
  • Maintenance Free / Easy Installation
  • Charges in all Weather Conditions
  • Plugs into Cigarette Lighter
  • Battery Clamps Included
  • Mounts on Windshield with Included Suction Cups
  • Made of Durable ABS Plastic & Amorphous Solar Cells
  • Plugs into Cigarette Lighter with Alligator Battery Clamps Included
  • Temperature Range: -40° to 176° F
  • Max Output 1.8 Watts 125 Mah

In honor of Earth Day, Eio will focus on the “R” of REUSE in the “reduce-reuse-recycle” dictum. Today’s topic is rechargeable batteries, such as our popular 4-pack of Lenmar 2700mAh AA NiMH Rechargeable Batteries.

Rechargeable batteries seem more ecological and economical than single-use batteries, but are they? Here are three useful points to think through when choosing rechargeable versus single-use batteries.

Life-Span

How do rechargeable batteries’ lifespans compare to single-use ones?

While it is difficult to quantify how many hours a battery lasts, most modern-day rechargeable batteries’ lifespans contain around 150 recharges. Single-use batteries, of course, die once they run out. But their lifespans all depends on variables such as the type of battery used and the rate at which a device consumes power.

Costs

Are rechargeable batteries’ longer lifespans worth it despite their high costs?

Rechargeable batteries may be pricier at the outset, but they are thought to save users money over the life of each battery. One downside is that rechargeable batteries and their accompanying chargers can sometimes be more difficult to find. If say, you buy the aforementioned Lenmar battery and battery charger, it is possible you may be unable to replace these items because less-popular products sometimes get discontinued.  Single-use batteries, on the other hand, are available everywhere and come in most sizes.

Waste

How do rechargeable batteries help the environment compared to single-use ones?

Rechargeable batteries do help reduce the amount of waste generated by single-use batteries, which hit 180,000 tons in 2010. However, if one does not recycle rechargeable batteries once they die, contamination is much more likely because they contain heavy metals that some single-use batteries do not possess.

The general rule-of-thumb is to recycle ALL batteries, whether they are rechargeable or not.

Go here for SoCal battery-recycling centers. Go here to mail in your batteries to be properly recycled. Visit Call2Recycle.org for all your recycling needs.

A Final Thought

We would love to give you a definite answer of “rechargeables YES, single-use NO!” But much depends on where you’ll use the battery and how much power the device uses.

Jennifer Berry, over at Earth911.com says this:

So, what are you going to use? Is it a high-tech gadget that needs portable power on a regular basis? Then rechargeables are for you…

[But] rechargeable batteries aren’t necessary for low-cost products that don’t use much power. For example, TV remote controls can sometimes last for years on a single-use battery, so it doesn’t make sense to purchase more expensive rechargeable batteries for such a low maintenance device.”

In sum, when choosing which battery is a better choice, it all depends. Yes, rechargeables may seem cheaper in the long-run, but it all depends on what type of gadget the battery is for.

And in all things, please recycle your batteries correctly. Our future will thank you for that one small gesture.

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