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Solar-Powered Charger

Solar cell lead-acid charger

Solar-Powered Charger
During the summer months they appear again all over the place: those solar powered garden lights. During the day they store the captured solar energy, which is used at night to provide lighting. If you'd like to use this energy for something different, such as listening to the radio or playing a CD, you'll find this circuit fits the bill.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

R1 = 100mOhm (e.g. Digikey # 12FR100OH-ND)
R2 = 82k
R3 = 10k
P1 = 2k5 preset
C1,C2= 100nF
C3,C4 = 47µF 16V radial
C5 = 47pF
D1 = MBR350 (Digikey # MBR350-ND)
IC1 = MAX1771-CPA (Digikey # MAX1771EPA-ND)
T1 = IRFU3708 (Digikey # IRFU3708-ND)
K1,K2 = 2-way PCB terminal bloc, lead pitch 5mm
L1 = 10 ?H high current (Digikey # M6007-ND)
PCB, ref. 040474-1 from The PCBShop
8 solar cells (e.g., Conrad Electronics # 198056-62)
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