Popular Science (1-year auto-renewal)

Popular Science (1-year auto-renewal)

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Post Date : Apr 21, 2012 05:57:12 | Usually ships in 4 to 6 weeks

Popular Science (1-year auto-renewal)

The 'What's New'" magazine of science and technology. Covering the latest developments in cars, electronics, communications, tools, energy, aviation, science, space exploration and much more.

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National Geographic

!±8± National Geographic

Brand : | Rate : | Price : $15.00
Post Date : Mar 16, 2012 10:45:12 | Usually ships in 1 to 3 months

NATIONAL GEOGRAPHIC, the flagship magazine of the National Geographic Society, chronicles exploration and adventure, as well as changes that impact life on Earth. Editorial coverage encompasses people and places of the world, with an emphasis on human involvement in a changing universe. Major topics include culture, nature, geography, ecology, science and technology.

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Popular Mechanics (1-year auto-renewal)

!±8± Popular Mechanics (1-year auto-renewal)

Brand : | Rate : | Price : $7.00
Post Date : Feb 19, 2012 02:57:04 | Usually ships in 4 to 6 weeks

Popular Mechanics (1-year auto-renewal)

Popular Mechanics is for people who have a passion to know how things work. It's about how the latest advances in science and technology will impact your home, your car, consumer electronics, computers, even your health. Popular Mechanics - answers for curious minds.

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HQRP 20 Amp 12V / 24V Solar Charge Power Controller / Regulator 20A 300W with Battery Charge Monitor plus HQRP UV Chain / UV Radiation Health Tester

!±8±HQRP 20 Amp 12V / 24V Solar Charge Power Controller / Regulator 20A 300W with Battery Charge Monitor plus HQRP UV Chain / UV Radiation Health Tester

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Post Date : Jan 27, 2012 02:21:29
Usually ships in 24 hours

HQRP Solar Charge Controllers are high quality, efficient and reliable Solar Power Regulators. They are perfect for rural electrification system. They offer a lot of possibilities and benefits. Regulations point: 14.4 Volts; Low voltage Disconnect: 11.1V Volts; Low voltage Reconnect: 13.1 Volts; Microcontroller digital accuracy; Type of Charging: Series PWM & stat of charge(SOC); 4 Stages: equalization, PWM, Boost and Float, temperature compensated charging; Electronic protections: Short circuit and over current-solar and load; Reverse current at night; Limits high voltage to protect loads; Lighting protection; Tropicalization: Conformal coated printed circuit board; Self-consumption: 6mA maximum. Solar Controller supports up to 300W of 12V Solar panels and up to 600W of 24V Solar panels. For 12V solar panels, please, use battery and load for 12V solar systems (For 24V solar panels, please, use battery and load for 24V solar systems). HQRP UV Chain / UV Radiation Tester: To know the Solar UV Index, it is enough to compare the colorchange with the 4 standard colors around. Very light purple: low intensity, UV index 1-2. Sun-protection not necessary. Light purple: medium intensity, UV index 3-5. Sun-protection is recommended. Purple: strong intensity, UV index 6-7. Sun-protection is necessary. Dark purple: very strong intensity, UV index 8-11. This tester shows you the level of UV radiation and helps you protect your eyes and skin from negative sunlight effect, but this meter doesn't show sunlight intensity for solar panels.

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