Solar cell phone charger efficiency can be described technically as the ratio of the useful work performed by the total solar energy can absorb from the sunlight. The talk time or standby time (electrical energy) is the amount need to count to know the efficiency of the solar cell phone charger either it can be stand for the desirable period time or vice verse.

The major consideration of solar cell phone charger efficiency is based on the characteristic of solar panel and battery used. The solar panel is from semiconductor material that usually used on the computer and memory chips. The most commercial solar panel today makes screen printed poly-crystalline silicon solar cells and the most of used this material.

The reason of this poly-crystalline silicon used because of it can be made into excellent high efficiency solar cell and more light compare to typical silicon. In the easy words, this poly-crystalline silicon can absorb coupled of solar energy from the sun more than usual.

Beside the good characteristic of solar panel, the efficiency also increased by using the lithium ion battery. Lithium ion battery used mostly on the all mobile phone products today due to the ability of this battery can put the huge capacity of electricity energy and rechargeable by the sunlight.

The efficiency of solar cell phone charger also can stated as the quality of being efficient like a practical, ideal power supply, portable, convenient, durable and compatible device at the future. Moreover, it is the best way to support the green issue where is how beneficial the sun to the earth's life.