Juta MPPT-20 User manual

MPPT(Maximum Power Point Tracking) Solar Charge Controller
User’s manual
JUTA MPPT-20（30）
Model
Feature: The most important feature of this
controller is intelligent tracking input voltage
from solar panel, which could let solar panel
always working at Maximum Power Point of
V-A curve. Compared with normal solar
charge controller, this MPPT controller could
increase 10%-30%electrical power using
efficiency from solar panel.
Picture 1
Function: This MPPT controller is not only have above mentioned special function, at the
same time including completely Protecting and Controlling functions:
Overcharge protection
Overdischarge protection
Battery Reverse Current Protection
Overloading Protection
Short Circuit Protection
Reverse Polarity Connection Protection
Schematic Diagram: Picture 2 shows typical 12V battery solar charge system V-A curve.
Normal Solar Charge Controller: Solar Panel works at point A state, the solar panel
working voltage is a little higher than battery voltage.
Charge Voltage: UA=13.2V
Charge Current:: IA=9.8A
Charge Power: PA=13.2*9.8=129.36w
Area in drawing: ①＋③
MPPT Solar Charge Controller: Solar Panel works at
point B state, the solar panel working voltage much
higher than battery voltage.
Charge Voltage: UB=18.4V,
Charge Current:: IB=9.3A
Charge Power: PB=18.4*9.3=171.12w
Area in drawing: ①＋② Picture 2
Comparison: The power B is more than power A..

P/ PA=（PB— PA）/ PA＝32..3%
As a result of different manufacture of solar panels, different solar illumination intensity, different
temperature, different efficiency of solar charge controller and so on. The effective power
increase rate is 10-30%.
Form a complete set:
Solar Panel: 12V solar system should use 40pcs cells laminated solar panel. The maximum
power pointvoltage is18V above. 24V solar system should use 2pcs above mentioned solar
panels. 48V solar system should use 4pcs above mentioned solar panels.
Conductor: The cable between solar panel with MPPT solar charge controller should be better
calculated by 1Ampere per 1mm².
Solar Charge Controller: JUTA brand MPPT-10 Model solar charge controller Rated input
Ampere is 20A（30A）. We have 12V, 24V and 48V three kinds of MPPT solar charge
controllers (other specifications could be designed as customer special request). Fit for
power of solar panels:
12V ：20—400Wp（600Wp）24V：40—800Wp（1200Wp）48V：80-1600Wp (2400Wp)
Connection: ( As Picture 3 according to
below process)
1. Connected the “+”, “-” poles of the
battery to the controller ( 3, 4 from left)
firmly and correctly. At this time the
LOAD green LED is bright. If the LOAD
green LED is not bright, it is indicate
there is battery reverse polarity
connection. Only LOAD green LED is
bright, we could continue next step
operation.
2. Connected the “+”, “-” poles of the solar
panel to the controller (1,2 from the left)
firmly and correctly.
3. Connected the “+”, “-” poles of the LOAD to
the controller (5,6 from the left) firmly and correctly. Picture 3
Simply Measure Methord: For 12V system, measure the input voltage from solar panel
with multimeter (terminal 1, 2 of controller), it is normal if the voltage of solar panel more
than battery voltage 0.5-6V. Generally, the higher input voltage, the better charge
efficiency. For 24v and 48V system, the input voltage will be much more higher than
battery voltage
(Note: It is normal phenomenon the controller can not find Maximum Power Point within
10 minutes from system start.)
Indicator: (Picture 1)
1. Load indicator, green, bright indicate there is output, Load could work, “off” indicate
there is not output, Load can not work.

2. Low Voltage Indicator, red, bright indicate the voltage of the battery is low. Load
could not normal working. This is normal phenomenon. When the battery voltage
recover to 12.6V or (25.2v), the Load will be automatically working, at this time the
indicator is off.
3. Charge Indicator, green, bright indicate the battery need to charge, flickering means
float charging, off means charge has stop.
RESET Button: The rated output current of this MPPT solar charge controller is 20A
（30A）, if there is short circuit or overload happened, the MPPT controller will close
output. ( Load indicator off, Low voltage indicator off.)
If you need the MPPT controller recover work, please check the reasons and clear out the
fault firstly. Then put a small stick such as toothpick, ball-pen tip inside the RESET hole,
and press RESET button will be OK.
Attention:
1. Please check the rated voltage of the solar panel, battery, load are all the same
with 12V or 24V or 48V.
2. Please pay attention to connection, do not connect the “+” “-” poles of solar
panels and load wrong.( Wrong connection will be burn your MPPT controller)
3. Battery must be connected earlier than solar panels and load. When take off the
system, Solar Panels must be take down first, then cut off battery.
4. The rated current of solar panel and load must be less than MPPT controller’s
rated current.