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Solar Cell Trickle Charger (12V/1.5W)
perhaps a stupid question can you charge a cellll phone with this?
It is possible, but you would need to know what your cell phone's charger is rated at in terms of VDC output. Most smartphones today charge over USB, so saying 5 VDC is a safe bet.The most power hungry of the newer smart phones can draw up to 1.5 amperes from a 5 VDC supply (7.5 watts consumption), so it will consume all of the current available from the solar panel; which is rated at 1.5 watts (or 125 mA). Finally we have to factor for maximum VDC output of the panel, which is 14.5 VDC.Now we need to determine the voltage dropping resistor to be wired in series from the positive output from the solar panel to your cell phone's charging connector positive.The formula for finding the resistor is R = (VS - VL) / I, where R = the resistor, VS = supply voltage, VL = the voltage that the cell phone wants to see, and I = the current consumed by the cell phone.R = (14.5 - 5)/0.125, R = 9.5/0.125, R = 76 ohms.Keep in mind that this would trickle charge only, but should be enough to keep your cell phone at a stable level while in use. Micro USB is most common today, with pin 1 as the V+ and pin 5 as the ground.
Date published: 2011-09-08
It says in the product details above;"The solar cell produces up to 1-1/2 watts of power, so there is no worry of overcharging and battery damage. A built-in protection circuit guards against current reversal."How exactly does it protect form over charging? Will the panel shut itself down or disconnect the current to when the battery reaches a full charge?I want to use this solar panel to charge a battery about the size of a lawn tractor battery, about 7-10 Ah (12v). The battery would power an amplifier (15w amp to be exact) and speakers so that I will have quality, portable music. I then would invert off of the battery to charge cell phones, Ipds, maybe a light, etc.
12V lead acid batteries can be safely float charged at 14.5V, which is the maximum output voltage of this solar charger. Once the battery charges to the same voltage as the charger, it stops drawing current and stops charging.
Date published: 2012-10-31