12V DC Battery Charging Station Complete Technical Specifications

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Battery and Appliance Sizing

Batteries used with this charging station should be 12V lead-acid batteries with a capacity of at least 3 amp-hours (the charging rate would be too high for anything smaller). The maximum size battery for which this system can counteract self discharge is about 550 amp-hours. 

12V DC Appliances connected to this system should generally draw less than 3 amps of current. If the appliance is only used for a few minutes a day (e.g. a gate opener), you may be able to use higher current appliances. To prevent wearing out your battery prematurely, make sure the appliance will draw less than half the battery's capacity in an average day. 

 Parts

The Solar Panel

Description: Solar panels are a clean way to generate electricity, and use a widely abundant resource (sunlight).
Specifications: 20 Watts; tempered glass front; weather-resistant anodized aluminum frame; mounting hinges and bracket attached; 20 feet of 16-2 AWG stranded tinned copper, water blocking, sunlight resistant, indoor/outdoor cable with click connects for quick installation.
Dimensions: 19.3 inches by 13.8 inches by 1 inch


The Charge Controller

Description: A charge controller charges and maintains the battery, and keeps the solar panel from overcharging it. It also prevents the LEDs or other loads from over-discharging the battery and damaging it. Yeti Solar pre-installs it in the light fixture, with color coded click-connects to connect solar panel, battery, LEDs and (optional) Exclamation Light.
Specifications: Charges using boost, equalize, and float stages; uses Pulse Width Modulation (PWM); red light indicates charging; green light indicates battery connected; low standby power consumption (<0.001 miliAmps)

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Summary Specifications

Solar Panel
Peak Power: 20 Watts
Mounting: Attached hinges and bracket
Mounting Angle: ~35 degrees (adjustable)
Cable: 20 feet, 16-2 AWG, indoor/outdoor
Charge Controller
Charging Method: PWM
Standby Power Consumption: <0.001 mAmp
Protection: Overvoltage, Reverse Polarity, Low Voltage, and Short Circuit