MPPT MC2440N10 User Manual

05 06
U
(
V
)
I
(
A
)
P
(
W
)
VP curve
VI
94. 5
81. 0
67. 5
54. 0
27. 0
40. 5
13. 5
0. 0
19. 616. 814. 011. 28. 45. 62. 80. 0
0. 5
1. 0
1. 5
2. 0
2. 5
3. 0
3. 5
4. 0
4. 5
5. 0
MPPT point
In addition, due to the difference in ambient temperature and light conditions, the maximum power
point often changes. The MPPT controller can adjust parameters according to different conditions from
time to time to keep the system near to its maximum working point. The whole process is fully automatic
and does not require any adjustments by users.
curve
PWM
charge
Figure 1-2 Solar panel output characteristics curve
Figure 1-3 Relationship between solar panel
output characteristics and light
U
(
V
)
Light decreases, current decreases
Light decreases and open circuit voltage decreases
Figure 1-4 Relationship between solar panel
output characteristics and temperature
20 ℃
50 ℃
70 ℃
60 ℃
40 ℃
30 ℃
I(A)
U( V)
Temperature decreases,
current does not change,
but power increases:
Temperature rises, the open circuit voltage decreases:
Solar panel temperature
Figure 1-5 Battery charging stages curve graph
A B
C
Bo os t
Bu
l
k
Equalizing charge voltage
Boost charge voltage
Floating charge voltage
Charge return voltage
Quick charge
Holding charge
Floating charge
Max. current
Holding time: 2h
(Range: 10 to 600min)
Cumulative time: 3h
Charge current
Time
Battery voltage
Time
a) Quick charge
In quick charge stage, the battery voltage has not yet reached the set value of full charge voltage (i.e.
equalizing/boost charge voltage) and the controller will perform MPPT charging, which will provide
maximum solar energy to charge the battery. When the battery voltage reaches the pre-set value,
constant voltage charge will start.
b) Holding charge
When the battery voltage reaches the set value of holding voltage, the controller will perform constant
voltage charging. This process will no longer include MPPT charging, and the charging current will
gradually decrease with time. Holding charge comes in two stages, i.e. equalizing charge and boost
charge. The two stages are conducted without repetition, in which equalizing charge is started once
every 30 days.
Boost charging
The default duration of boost charge is 2 hours. The customer can also adjust the holding time and the
pre-set value of boost voltage point according to actual needs. When the duration reaches the set value,
the system will switch to floating charge.
Equalizing charging
Warning: Risk of explosion!
Equalizing vented lead-acid battery may generate explosive gases. So, the battery compartment must be
well ventilated.
Caution: Damage of device!
Equalization can increase the battery voltage to levels that may damage sensitive DC loads. It is
necessary to verify that the allowable input voltage of all system loads is greater than the equalizing
charge set value.
Caution: Damage of device!
Over charge and excessive gas evolution may damage the battery plates and cause active substances on
the battery plate to come off. Equalizing charge may cause damage if voltage is too high or time is too
long. Please carefully check the specific requirements of battery used in the system.
P(W)
I(A)
I(A)
As one of the charging stages, MPPT cannot be used alone. It is usually required to combine boost
charge, floating charge, equalizing charge and other charging methods to complete the battery charging
process. A complete charging process includes: Quick charge, holding charge and floating charge.
Charging curve is shown below:
1.5 Charging Stage Introductions
!
!

MPPT MC2440N10 Specifications

General

Brand	MPPT
Model	MC2440N10
Category	Inverter
Language	English