VEVOR ML Series User manual

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Technical Support and E-Warranty Certificate www.vevor.com/support
ML MAXIMUM POWER POINT TRACKING
(MPPT) SERIES
ML2420
SOLAR CHARGE AND DISCHARGE CONTROLLER
USER MANUAL
We continue to be committed to provide you tools with competitive price.
"Save Half", "Half Price" or any other similar expressions used by us only represents an
estimate of savings you might benefit from buying certain tools with us compared to the major
top brands and doses not necessarily mean to cover all categories of tools offered by us. You
are kindly reminded to verify carefully when you are placing an order with us if you are
actually saving half in comparison with the top major brands.

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MODEL:ML2420
Have product questions? Need technical support? Please feel free to
contact us:
Technical Support and E-Warranty Certificate
www.vevor.com/support
NEED HELP? CONTACT US!
This is the original instruction, please read all manual instructions
carefully before operating. VEVOR reserves a clear interpretation of our
user manual. The appearance of the product shall be subject to the
product you received. Please forgive us that we won't inform you again if
there are any technology or software updates on our product.
ML MAXIMUM POWER
POINT TRACKING (MPPT)
SERIES

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Warning-To reduce the risk of injury, user must read
instructions manual carefully.
This device complies with Part 15 of the FCC Rules. Operation is
subject to the following two conditions:(1)This device may not cause
harmful interference, and (2)this device must accept any interference
received, including interference that may cause undesired operation.
This product is subject to the provision of European Directive
2012/19/EC. The symbol showing a wheelie bin crossed
through indicates that the product requires separate refuse
collection in the European Union. This applies to the product
and all accessories marked with this symbol. Products marked
as such may not be discarded with normal domestic waste, but
must be taken to a collection point for recycling electrical and
electronic devices
Model
ML2420
Battery voltage
12V/24V
Max. PV open circuit voltage
100V(25℃)，90V( -25℃)
Charge current
20A
Max. PV input power
20A

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Dear users, Thank you very much for choosing our products!
SAFETY INSTRUCTIONS
1. As this controller deals with voltages that exceed the top limit for
human safety, do not operate it before reading this manual carefully and
completing safety operation training.
2. The controller has no internal components that need maintenance or
service, thus do not attempt to disassemble or repair the controller.
3. Install the controller indoors, and avoid component exposure and
water intrusion.
4. During operation, the radiator may reach a very high temperature,
therefore install the controller at a place with good ventilation conditions.
5. It's recommended that a fuse or breaker be installed outside the
controller.
6. Before installing and wiring the controller, make sure to disconnect the
photovoltaic array and the fuse or breaker close to the battery terminals.
7. After installation, check if all connections are solid and reliable so as to
avoid loose connections that may give rise to dangers caused by heat
accumulation.
Warning: means the operation in question is dangerous, and you
should get properly prepared before proceeding.
!
Note: means the operation in question may cause damage.
Tips: means advice or instruction for the operator.

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Table of Contents
1. Product Introduction ............................................................................05
2. Product Installation ..............................................................................14
3. Product Operation and Display.............................................................20
4. Product Protection and System Maintenance......................................26
5. Product Specification Parameters........................................................31
6. Conversion Efficiency Curve................................................................33
7. Product Dimensions.............................................................................34

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1. PRODUCT INTRODUCTION
1 .1 Pr o du c t Ov e r v ie w
This product can keep monitoring the solar panel's generating power
and tracking the highest voltage and current values(VI)in real time,
enabling the system to charge the battery at maximum power. It's
designed to be used in off-grid solar photovoltaic systems to
coordinate operation of the solar panel, battery and load, functioning
as the core control unit in off-grid photovoltaic systems.
This product features an LCD screen that can dynamically display the
operating status, operating parameters, controller logs, control
parameters, etc. Users can conveniently check parameters by the
keys, and modify control parameters to cater to different system
requirements.
The controller utilizes standard Modbus communication protocol,
making it easy for users to check and modify system parameters on
their own.Besides, by providing free monitoring software, we give
users the maximum convenience to satisfy their varied needs for
remote monitoring.
With comprehensive electronic fault self-detecting functions and
powerful electronic protection functions built inside the controller,
component damage caused by installation errors or system failures
can be avoided to the greatest extent possible.
1 .2 P r o du c t Fe a t ur e s
With the advanced dual-peak or multi-peak tracking technology, when
the solar panel is shadowed or part of the panel fails resulting in
multiple peaks on the I-V curve, the controller is still able to accurately
track the maximum power point.
A built-in maximum power point tracking algorithm can
significantly improve the energy utilization efficiency of photovoltaic
systems, and raise the charging efficiency by 15% to 20% compared
with the conventional PWM method.

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A combination of multiple tracking algorithms enables accurate
tracking of the optimum working point on the I-V curve in an extremely
short time.
The product boasts an optimum MPPT tracking efficiency of up to
99.9%.
Advanced digital power supply technologies raise the circuit's energy
conversion efficiency to as high as 98%.
Charging program options are available for different types of batteries
including gel batteries, sealed batteries, open batteries, lithium
batteries, etc.
The controller features a limited current charging mode. When the
solar panel power exceeds a certain level and the charging current is
larger than the rated current, the controller will automatically lower the
charging power and bring the charging current to the rated level.
Instantaneous large current startup of capacitive loads is supported.
Automatic recognition of battery voltage is supported.
LED fault indicators and an LCD screen which can display
abnormality information help users to quickly identify system faults.
Historical data storage function is available, and data can be stored for
up to a year.
The controller is equipped with an LCD screen with which users can
not only check device operating data and statuses, but also modify
controller parameters.
The controller supports standard Modbus protocol, fulfilling the
communication needs of various occasions.
The controller employs a built-in over-temperature protection
mechanism. When temperature surpasses the set value, the charging
current will decline in linear proportion to the temperature so as to curb
the temperature rise of the controller, effectively keeping the controller
from being damaged by overheating.
Featuring a temperature compensation function, the controller can
automatically adjust charging and discharging parameters in order to
extend the battery's service life.
TVS lighting protection.

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1 .3 E x t er i o r an d I n t e rf a c es
Fig. 1-1 Product appearance and interfaces
No.
Item
No.
Item
①
Charging indicator
⑩
Battery "+" interface
②
Battery indicator
⑪
Battery "-" interface
③
Load indicator
@
Load "+" interface
④
Abnormality indicator
⑬
Load "-" interface
⑤
LCD screen
⑭
External temperature sampling interface
⑥
Operating keys
⑮
RS232/RS485 communication interface
⑦
Installation hole
⑧
Solar panel "+" interface
⑨
Solar panel "-" interface

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1 .4 I n tr o d u ct i o n t o M a x i mu m Po w e r P o in t Tr a c k i n g Te c h n o l og y
Maximum Power Point Tracking (MPPT) is an advanced charging
technology that enables the solar panel to output more power by adjusting
the electric module's operating status. Due to the nonlinearity of solar
arrays, there exists a maximum energy output point (maximum power point)
on their curves. Unable to continuously lock onto this point to charge the
battery, conventional controllers (employing switching and PWM charging
technologies) can't get most of the power from the solar panel. But a solar
charge controller featuring MPPT technology can continuously track arrays'
maximum power point so as to get the maximum amount of power to
charge the battery.
Take a 12V system as an example. As the solar panel's peak voltage (Vpp)
is approximately 17V while the battery's voltage is around 12V, when
charging with a conventional charge controller, the solar panel's voltage
will stay at around 12V, failing to deliver the maximum power. However, the
MPPT controller can overcome the problem by adjusting the solar panel's
input voltage and current in real time, realizing a maximum input power.
Compared with conventional PWM controllers, the MPPT controller can
make the most of the solar panel's max. power and therefore provide a
larger charging current. Generally speaking, the latter can raise the energy
utilization ratio by 15% to 20% in contrast with the
former.

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Meanwhile, due to changing ambient temperature and illumination
conditions, the max. power point varies frequently, and our MPPT
controller can adjust parameter settings according to the environmental
conditions in real time, so as to always keep the system close to the max.
operating point. The whole process is entirely automatic without the need
for human intervention.