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Solar MPPT Charge Controller and discharge controller



SCM-1220/2420  12V/24V Solar MPPT Charge Controller (Aluminum casing)

solar MPPT charge controller Feature
*12V/24V Solar PV panel input, working current up to 30A
*Use AVR micro-processor to track the MPP, get a higher efficiency than general charger system.
*Designed for kinds of battery type: Lead-Acid, Li-ion, LiFePo4, NIMH and NICD.
*With over-charged and over-discharged warning and cut-off function
*Input and output battery-reversed protection, safe for installation
*Has temperature sensor, auto adjust charging curve according enviromrnt temperature
*With optional I2C or SMBus communication protocol.
*Low power consumed, less than 5mA at stand-by condition.
Note: This family has 200pcs MOQ limitation.
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*How does MPPT (Maximum Power Point Tracking) work?


Maximum Power Point Tracking , called MPPT, is electronic tracking - usually digital. The charge controller looks at the output of the panels, and compares it to the battery voltage. It then figures out what is the best power that the panel can put out to charge the battery. It takes this and converts it to best voltage to get maximum AMPS into the battery. (Remember, it is Amps into the battery that counts). Most modern MPPT's are around 93-97% efficient in the conversion. You typically get a 20 to 45% power gain in winter and 10-15% in summer. Actual gain can vary widely depending weather, temperature, battery state of charge, and other factors.
Please refering above curve, you can understand how the MPPT get more effieincy. Classical charger works at point "Q" in the U-I curve, MPPT charger works at "P" point. The output power at "Q" point is only 50% of "P" power.
MPPT's are most effective under these conditions:Winter, and/or cloudy or hazy days - when the extra power is needed the most.
1.Cold weather - solar panels work better at cold temperatures, but without a MPPT you are losing most of that. Cold weather is most likely in winter - the time when sun hours are low and you need the power to recharge batteries the most.
2.Low battery charge - the lower the state of charge in your battery, the more current a MPPT puts into them - another time when the extra power is needed the most. You can have both of these conditions at the same time.
3.Long wire runs - If you are charging a 12 volt battery, and your panels are 100 feet away, the voltage drop and power loss can be considerable unless you use very large wire. That can be very expensive. But if you have four 12 volt panels wired in series for 48 volts, the power loss is much less, and the controller will convert that high voltage to 12 volts at the battery. That also means that if you have a high voltage panel setup feeding the controller, you can use much smaller wire.

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*What's the basic circuits for general MPPT charge function?

There are many kinds of circuits can achieve MPPT charge function, but the basic power topology of all these circuits can be
concluded as three types: "Buck Convert", "Boost Convert" and "Buck-Boost Convert". For cost and others reason, Buck topology
circuits is more popular than the other two convert.