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I bought this charge controller from china some months ago. I read about mppt and went for it. Well, it was only $60 but at the time I thought that was a lot for a charge controller. I've come a long way since then and have ordered an outback mppt charge controller. So I don't think this is an mppt because when I measure 6.xx amps at the pv terminals, it only reads 4.xx on the lcd. It has a MPPT Demo button which, when pressed, shows you that 4.20 amps is being converted to about 4 amps. I wrote to the seller a couple times and they swear by their product and say I should take it to a professional to verify it's an mppt cc.
Here are the specs from them.
20A MPPT( Max Power Point Tracking) solar charge controller, solar regulator
the efficiency increased by 15-30%
Features：
l High technology MPPT, the efficiency > 98%
l Adopt DC converting circuit、convert efficiency > 96%
l With LCD display, display the efficiency by this controller,
l Function as a power meter，LCD show the battery voltage, charging current, charging power, output status, output mode, time, and accumulate power saving.
l Suitable for wide range battery. Volta
l Max charge and discharge current 10A
l Five output modes：Manual、standard、timer、 light sensor、light sensor on+timer off
l Built in timer , suitable for periodicity discharge system, such as solar street light ,solar pump, etc
l Over charge, over discharge, overload, short circuit protect function
l 3-stage charging algorithm, impulse, bulk,and float
l Total Aluminium housing for good heat sinking,
l Low stand-by power consumption
Specification:
l Rated voltage 12V DC/24VDC
l Max voltage: 40V DC
l Max solar panel 360W
★(1) Max input current 20A
★(2) Max output current 22A
l Max discharging current 20A
l Over discharging voltage 10.2—12.5V (±0.2)
l Restart charging voltage 10.3—13.5V (±0.2)
l Constant charging voltage 13.0—15.5V (±0.2)
l Float charging voltage 12.5—14.5V (±0.2)
l Adaptor Buck
l timer precision ±50S/Month
l Control mode for charging PWM
l stand by power consumption <15mA
l operating temperature -20 to +50℃
l Protecting IP22
l Size 140(L) × 147(W) × 42(H) （mm）
l Weight 550g
Here are the specs from them.
20A MPPT( Max Power Point Tracking) solar charge controller, solar regulator
the efficiency increased by 15-30%
Features：
l High technology MPPT, the efficiency > 98%
l Adopt DC converting circuit、convert efficiency > 96%
l With LCD display, display the efficiency by this controller,
l Function as a power meter，LCD show the battery voltage, charging current, charging power, output status, output mode, time, and accumulate power saving.
l Suitable for wide range battery. Volta
l Max charge and discharge current 10A
l Five output modes：Manual、standard、timer、 light sensor、light sensor on+timer off
l Built in timer , suitable for periodicity discharge system, such as solar street light ,solar pump, etc
l Over charge, over discharge, overload, short circuit protect function
l 3-stage charging algorithm, impulse, bulk,and float
l Total Aluminium housing for good heat sinking,
l Low stand-by power consumption
Specification:
l Rated voltage 12V DC/24VDC
l Max voltage: 40V DC
l Max solar panel 360W
★(1) Max input current 20A
★(2) Max output current 22A
l Max discharging current 20A
l Over discharging voltage 10.2—12.5V (±0.2)
l Restart charging voltage 10.3—13.5V (±0.2)
l Constant charging voltage 13.0—15.5V (±0.2)
l Float charging voltage 12.5—14.5V (±0.2)
l Adaptor Buck
l timer precision ±50S/Month
l Control mode for charging PWM
l stand by power consumption <15mA
l operating temperature -20 to +50℃
l Protecting IP22
l Size 140(L) × 147(W) × 42(H) （mm）
l Weight 550g
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