Portable Solar Generator

This is a 20 Watt Mono-crystalline Portable Waterproof Solar Panel in black color (very rare) aluminum frame to charge your 12V battery or to run your science projects. The rare black color frame looks very nice. It is in a factory new package and is 100% brand new. The solar panel is assembled by Suntech, one of the highest quality solar cell makers. It is also waterproof. The working voltage for charging is 18V. If you need to use it to charge a car battery, you may need a charge controller to prevent the battery from overcharging. Connections included: alligator battery clamps. There are three types of Solar Cells on the market. All our Solar chargers use the best - Mono-Crystalline Solar Cells. Amorphous or Dual Junction Solar Glass are the cheapest but are only 7% energy efficient and have 5 years service life. They are big and heavy. Poly-Crystalline have 25 plus years of service life under direct sunlight and are 13% efficient. Mono-Crystalline have 25 plus years service life and are up to 20% efficient. This is the same type used in solar car racing. This type of solar cell is now in a worldwide shortage because only a few companies can manufacture this solar cell.

Amazon Sales Rank: #53185 in Lawn & Patio Brand: Solar Model: 20 Watt Dimensions: 16.00" h x 1.00" w x 17.00" l, 4.85 pounds Assembled professionally with Suntech Mono-crystalline solar cells (in a worldwide shortage TUV certified junction box with cable with MC connector By-pass diode to minimize power drop caused by shade Anti-reflective high transparency tempered glass Class II black color coated aluminum alloy frame

Most helpful customer reviews 19 of 20 people found the following review helpful. Technical review of 20 Watt Solar Panel Model DJ-20D By John Beukers Don't expect 20 Watts from this product. This is the second purchase of the Extreme Power Corp's 20W Solar Panel. The first unit did not meet the specifications defined on the label attached to the rear of the panel so I purchased this second unit to determine if the first unit was faulty. The second unit performed the same way. Here are the details: I tested the two units at 1000W/Sq. Meter in the sun (Calibration by Davis Weather station solar sensor) at 25 degC and 55 degC into a resistive 16 ohm load (VPmax/IPmax). Here are the results, spec. values in parenthesis: Open Circuit Voltage 19.4 volts (21.18V) P Max at 25deg C - 16.5 Watts (20 Watts) P Max at 55deg C - 12.8 Watts (Not specified but usual operating temp) Voltage at Pmax - 14.45 at 55 deg C (17.5 at 25 deg C) Short Circuit Current at 55 deg C 1.0 Amps (1.33 Amps at 25 deg C) I reported these resulte to Extreme Power Corp but there has been no comment. Two points to bear in mind. 1. - There is a tendancy to overspecify solar panel performance and 2. - Specifications are for performance at 25 deg C and no solar panel operates at this temperature. The maximum power output under any load conditions that I can get from these panels when cool (immediately after exposing to the sun) and at 1000 W/Sq. is 16.6 Watts. In operation do not expect more than about 14 Watts from these panels - if that is ok then the product, although misprepresented gets a pass. John Beukers 2009.05.19 16 of 17 people found the following review helpful. Solar PV System Casa de Baja By L. Anderson Location: K55, Baja California, Mexico Purpose: Reduce dependence on buddy's noisy & smelly gas generator during weekend trips to beach shack. Week of rest after every usage. System [June 2008]: -> 60W total [~3.5Amps]. Two 20W [18Vmp] panel & two 10W [18Vmp] panels of the same mono-crystalline construction. [16AWG] -> Morningstar MPPT 15 Amp Charge Controller. [14AWG] -> Two [2] new 12V ~100AH deep cycle batteries [parallel ~200AH, 1/0AWG] -> 700W AC inverter [4AWG] -> 3.5KW gas generator to 6Amp AC batt charger for extra charging capacity when needed Current Load: -> Three [3] 12V x 26W fluorescent fixtures -> Two [2] 12V x 15W fluorescent fixtures -> One [1] 12V x 11W fluorescent fixture -> One [1] 12V x 13W fluorescent fixture -> Yamaha 2.1 speakers, 25W -> Dual-port 12V car cig lighter adapter for mobile phone/iPod chargers. Notes: Panels are fixed @ slight SW & angle of ~35° from horizontal due to wind concerns, more than output, but very close to local latitude of ~32°. I was at the Baja house when the winds started the raging fires in SoCAL [2007], it was bad. Voltage reads 20-24+V @ 3.4-3.6 Amps pre-load between 10:00AM & 3:30PM in June. Current load is lighting- OFF & ON 3-4 hours per night. Usually only one or two is ON at any given time. Lights work very well, almost like normal house. iPod is self-powererd to Yamaha 25W 2.1 speakers on inverter for 2-6 hours during day. Currently, we must use generator for TV/movies/games. Expansion: Another 20W panel for 80W total went in Dec 2008- another 80W will conclude a 160W system. Goal is 3 to 4 times per month...lighting, music, & occasional 26" 60W LCD using 15W DVD player & 25W 2.1 speakers for movies when surf is flat. [~700-800 Watt-Hours/day] 16 of 19 people found the following review helpful. Power point is a little wierd... By William Yerazunis The panel took about a week to arrive; the packing was "wierd" (bubble wrap wrapped around the cardboard! ) but it was intact. The frame is aluminium, however the backing is plastic and the front side is glass (not Tefzel). The whole thing is sealed with copious amounts of silicone rubber. The wierd part of this panel is that it's _not_ exactly a 12-volt panel. In full noonday sun, it puts out 20 volts open-circuit, at 1.03 amperes. This is