Showing posts with label solar. Show all posts
Showing posts with label solar. Show all posts

11/18/2011

Kaito Electronics Inc. KA500BLK Voyager Solar/Dynamo Emergency Radio - Black Review

Kaito Electronics Inc. KA500BLK Voyager Solar/Dynamo Emergency Radio - Black
Average Reviews:

(More customer reviews)
I tested the KA500 along with several other self-powered radios for a project I'm working on in rural Sub-Saharan Africa.I found that the KA500 is a very capable shortwave receiver it's just not nearly as rugged as its competitors. Here are my thoughts:

What I like about the KA500:
- Solar Panel--the KA500 is one of the only portable shortwave receivers out there with a built-in solar panel. The panel is effective enough that it will power the radio (if in direct sunlight) without batteries and produce a reasonable amount of volume through its built-in speaker.

- The 5 LED reading lamp -- This reading lamp is impressive. If the batteries are fully charged, the lamp works for VERY long periods of time. I'm also an amateur radio operator and found that the reading lamp is bright enough that it lit up my large radio table.

- Good shortwave sensitivity -- For a self-powered analog radio, I was impressed with the shortwave sensitivity. I also found the AM broadcast and FM bands adequate/average.

- Good selectivity -- When a station is tuned-in well, you don't often hear adjacent signals.

- Good frequency coverage -- I like the fact that KA500 covers the NOAA weather frequencies, FM, AM and a very large portion of the SW spectrum (from 3.2 MHZ to 22MHz, missing only a little used piece between 8 & 9 MHz)

What I didn't like:
- Quality -- Though the radio feels solid in your hand, I found through my testing that the quality of the KA500 is actually quite poor. More than once, the tuning mechanism would slip and the needle would get stuck in the middle of the dial. The worst part, though, is the poor quality of the hand-crank mechanism. The dynamo and crank arm feel cheap. Well, they are cheap.After only a month of occasional testing--and with me being very careful with the hand crank--the dynamo started showing signs of failing. The crank became less fluid to turn and would rub the side of the radio chassis. One day, while slowly cranking, the crank arm just snapped in half. No more crank power.

- No Fine Tune control -- Kaito fits the whole SW1 and SW2 spectrum on a small dial. There were a few times I wish this radio had a fine tune control like the Grundig FR200.

BOTTOM LINE:
I sent my KA500 back and did not get it replaced. It's a shame, really. I loved the radio's features and overall performance, but was very disappointed with quality.

I could only recommend this radio to someone who plans on tucking it away and using it on rare occasions or someone who wants a basic full-featured radio but never plans on using the hand-crank.I'd also keep the receipt handy for the return (and buy from an authorized dealer like Amazon or Universal Radio).

For my purposes, I will be using the Grundig/Et

7/22/2011

Sakar ECOtrends CH-4632-ECO-BLK - Battery charger (solar) 4xAA/AAA - included batteries: 4 x AA NiMH 2300 mAh Review

Sakar ECOtrends CH-4632-ECO-BLK - Battery charger 4xAA/AAA - included batteries: 4 x AA NiMH 2300 mAh
Average Reviews:

(More customer reviews)
This is an interesting gadget.

It's really a wall charger that can also slowly recharge batteries with the photovoltaic cells. It's nice that this item is a wall charges because you can get a good complete first charge for new NiMh batteries before charging with solar. (It's also good if you are short on time and can charge them from the outlet in much less time than only solar charging.)

The downside to this product is that the batteries take a really long time to charge on solar power alone. There is no meter showing the strength of the current provided by the solar cells and there is no information in the product manual to give any idea as to how long it would take to recharge batteries using solar power only. (Charging from an outlet takes 4-6 hours.)

I estimate that 2 to 3 days of good sun was enough to charge 2 high capacity AAA batteries. (900 mah) Since high capacity AA batteries have a much higher mah of 2300, it would take a very long time to fully charge the four AA batteries with solar power. (I'm guessing over a week) Although a full charge will take a long time, you can always use the solar charger for a partial recharge of your batteries.

The other drawback of this device is that the battery compartment is not enclosed, making the device more vulnerable to moisture. Since you get much more current from the solar cells when they are outside, you have to be really careful about moisture from weather. (You probably want to put the charger in a clear plastic bag.)

Overall I think this is a cool gadget, but if you are looking to charge batteries with solar power alone, other chargers can do the job better.

Click Here to see more reviews about: Sakar ECOtrends CH-4632-ECO-BLK - Battery charger (solar) 4xAA/AAA - included batteries: 4 x AA NiMH 2300 mAh

Product Description:
SOLAR AA/AAA CHARGER ECO TRENDS

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6/11/2011

IceTech Eco-Friendly Foldable Solar Charger For Mobile Devices Review

IceTech Eco-Friendly Foldable Solar Charger For Mobile Devices
Average Reviews:

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This is really good. The only complaint i have is that it feels a little cheap when you hold it, and you can feel stuff rattling around inside, but otherwise a really great product. This also includes a little led flash light. You can get your device to charge off of this for a while if it is in the sun. It has saved me a few times.

Click Here to see more reviews about: IceTech Eco-Friendly Foldable Solar Charger For Mobile Devices

Product Description:
The Solar charger i101 series from iceTECH USA, is capable of charging 99% of all mobile phones or USB interface digital products (MP3/MP4 players, portable GPS, etc..) which have operational voltage of 3.5-5 Volts.The Solar battery itself can be charged two ways, either by using direct sunlight (8-10hrs) or by plugging it directly into an electrical outlet (3-4hrs).Once the Solar Battery is charged you may use it to charge other devices such as your cell phone or any MP3/MP4 device. It will charge them at the same time frame as your conventional charger.You can also charge your device on the go by plugging it into the battery and leaving the battery under direct sunlight.- One hour of charging from direct sunlight provides about 1hour of mp3 playback.- When charging a cell phone directly from the sun, 60 minutes of sunlight will provide approximately 25 minutes of talk time and ten hours of standby time.- A fully charged SOLAR i101 will completely charge an average cell phone and many of them - even twice. *ATTN: Due to appearance of weak and potentially hazardous copies on the market, make sure to buy from our licensed vendors:Beach Camera , Buydig.com ,BTM, Datavision, Sears, HSN, Target, Endless Variety, BatteryStuff, SmartHome, J&R and Edmund Scientific.Features:- High (18%+) solar-to-electric power transforming rate;- Safe fast-charging of your mobile electronic devices;- Professional overcharge protection circuit;- High temperature protection when charging from sunlight;- 1 hour of charging your cellphone from the Sun on the go will give you ~20 minutes of talking time / 6hours of standby;- Built-in Li-ion battery charging time 0 to full via solar energy: 10-15hrs. via DC: 5hrs.- Charging time for your device to power up from a built in i101 Li- Ion battery is equal to charging it from the AC. Specifications:Solar Panel: Peak photocell power: 5.5V/80mA Operating voltage: 5.5V (max) Solar Charger:Battery capacity: 1350m...

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1/09/2011

Solar Powered Battery Charger with Meter Charges 2 "D" - "C" - "AA" - "AAA" Batteries Review

Solar Powered Battery Charger with Meter Charges 2 'D' - 'C' - 'AA' - 'AAA' Batteries
Average Reviews:

(More customer reviews)
This solar powered battery charger is a terrific item for camping or just around the house. It's a terrific energy saver, as it powers rechargeable batteries of any size in a matter of hours, and the charge lasts and lasts.

The item also charges 9 volt batteries, and we have been very happy with the unit. It is well constructed and sturdy, and will hold up to standard use. In other words, the plastic is industrial grade, much more sturdy your average Chinese battery operated toy.

Click Here to see more reviews about: Solar Powered Battery Charger with Meter Charges 2 D - C - AA - AAA Batteries

Product Description:
Brand New Universal Solar 11-in-One Battery Charger with MeterCharges 2 "D" - "C" - "AA" - "AAA" BatteriesDesigned for charging most popular types of rechargeable batteries: D size (UM-1), C size (UM-2), AA size (UM-3), AAA size (UM-4) and 7 different size GUM (Prismatic) Batteries!Description: This is the most versatile battery charger available on the market today. The solar panel is incorperated into the hinged cover which can be angled for maximum sun exposure. It goes beyond ordinarily employing the sunlight strength to charge your Ni-Cad batteries. Its in-built meter shows you the following conditions: -The strength of the sun -The strength of the current out-put from the solar panel -The time required to fully charge the different types of batteries This battery charger incorporates a built-in blocking diode to prevent reverse flow of electricity from charged batteries during storage. It is environmentally safe, cost efficient and trouble free. The polycarbornate transparent cover makes the charger weather resistant. This charger is an ideal gadget for camping, fishing, boating, and picnics. It is equally suitable for home use. It is designed to charge 11 different types of batteries: 7 different thickness "GUM" (prismatic) rechargeable batteries and the 4 more common batteries: "D," "C," "AA," and "AAA" size batteries. The table below shows more detailRegular Batteries GUM (Prismatic) Batteries D-Size (UM-1) 1500mA 5.6x16.4x66.2mm 600mA C-Size (UM-2) 1000mA 5.6x16.4x66.2mm 720mA AA-Size (UM-3) 500mA 6.1x17x67mm 650mA AAA-Size(UM4) 180mA 7.8x16.4xx66.5mm 850mA 8.3x17x67mm 900mA 10.5x17x67mm 1200mA 10.7x17x67mm 1750mA SpecsVoltage (VOC): 5V (maximum in full sunlight) Current (Isc): 140 mA (maximum in full sunlight)Dimension: 19 x 8.7 x 4cm Weight: 260 Grams

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1/04/2011

4 Battery Solar Charger Review

4 Battery Solar Charger
Average Reviews:

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I use this unit to charge C-cell batteries (4 at a time)
It does charge them but....I never know when they are done charging.
the unit does not come with a charge indicator.
The unit does not give them a full charge. only about 90% charged.
close but could be better.

Click Here to see more reviews about: 4 Battery Solar Charger

Product Description:
This unit will charge four equivalent D C AA AAA sized batteries at any one time. It includes an adjustable stand to assist in positioning for the best angle toward the sun. Can also be used indoors when placed in direct sunlight through a south-facing window. Bright sunlight is not necessary for this unit to work properly, but it obviously works faster when available. Overcast days are fine but it increases the time necessary to recharge the batteries completely.

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12/15/2010

Scosche SolBAT II Solar Powered Backup Battery and Charger Review

Scosche SolBAT II Solar Powered Backup Battery and Charger
Average Reviews:

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Purchased here on Amazon, it charges via the included ipod cable and also has a USB out port for charging anything else that has a USB enabled charger.Charged my droid from 30% to 100% in about an hour and that was even in cloudy conditions.Status lights show when it is receiving enough light to create charge and another status light shows when it is charging the connected device.It will even hold a charge like a battery so you can leave it in the sun to charge up then bring it in and connect it to your device.I may buy another!

Click Here to see more reviews about: Scosche SolBAT II Solar Powered Backup Battery and Charger

Product Description:
Use your existing USB cable to charge most devices including iPod iPhone MP3 Blackberry and more Internal 1500ma Lithium-Ion battery stores power for whenever you need it and recharges from the sun or the included USB cable Includes windshield mount cradle & universal carbineer mount Output: 5v 500ma

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