MPPT 20A With LCD Display Solar Power 12V/24V Solar Charge Controller Tools

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20A MPPT With LCD Display Solar Regulator 12V/24V Solar Charge Controller
Product Description
What is the different from PWM and MPPT Solar Controller?
PWM Solar Controller:
Quite a few charge controls have a PWM mode. PWM stands for Pulse Width Modulation. PWM is often used as one method of float charging. Instead of a steady output from the controller, it sends out a series of short charging pulses to the battery ? a very rapidon-off switch. The controller constantly checks the state of the battery to determine how fast to send pulses, and how long (wide) the pulses will be. In a fully charged battery with no load, it may justick every few seconds and send a short pulse to the battery. In a discharged battery, the pulses would be very long and almost continuous, or the controller may go intofull on? mode. The controller checks the state of charge on the battery between pulses and adjusts itself each time.
MPPT Solar Controller:
MPPT Solar Controller schematic
A maximum power point tracker (or MPPT) is a high efficiency DC to DC converter which functions as an optimal electrical load for a photovoltaic (PV) cell, most commonly for a solar panel or array, and converts the power to a voltage or current level which is more suitable to whatever load the system is designed to drive.
The most basic Solar Controller simply monitors the battery voltage and opens the circuit, stopping the charging, when the battery voltage rises to a certain level. Older charge controllers used a mechanical relay to open or close the circuit, stopping or starting power going to the batteries.
More modern charge controllers use pulse width modulation (PWM) to slowly lower the amount of power applied to the batteries as the batteries get closer and closer to fully charged. This type of controller allows the batteries to be more fully charged with less stress on the battery, extending battery life. It can also keep batteries in a fully charged state (calledfloat) indefinitely. PWM is more complex, but doesn?t have any mechanical connections to break.
The most recent and best type of Solar Controller is called maximum power point tracking or MPPT. MPPT solar controllers are basically able to convert excess voltage into amperage. This has advantages in a couple of different areas.
Most solar power systems use 12 volt batteries, like you find in cars. (Some use other voltages and the same advantages apply to these systems as well.) Solar panels can deliver far more voltage than is required to charge the batteries. By, in essence, converting the excess voltage into amps, the charge voltage can be kept at an optimal level while the time required to fully charge the batteries is reduced. This allows the solar power system to operate optimally at all times.
Another area that is enhanced by an MPPT charge controller is power loss. Lower voltage in the wires running from the solar panels to the charge controller results in higher energy loss in the wires than higher voltage. With a PWM charge controller used with 12v batteries, the voltage from the solar panel to the charge controller typically has to be 18v. Using an MPPT controller allows much higher voltages in the wires from the panels to the Solar Controller. The MPPT controller then converts the excess voltage into additional amps. By running higher voltage in the wires from the solar panels to the charge controller, power loss in the wires is reduced significantly.
MPPT charge controllers are more expensive that PWM charge controllers, but the advantages are worth the cost. If you can afford it, you should definitely use an MPPT Solar Controller.
The final function of modern Solar Controllers is preventing reverse-current flow. At night, when solar panels aren?t generating electricity, electricity can actually flow backwards from the batteries through the solar panels, draining the batteries. You?ve worked hard all day using solar power to charge the batteries, you don?t want to waste all that power! The charge controller can detect when no energy is coming from the solar panels and open the circuit, disconnecting the solar panels from the batteries.
Why we
recommend buy MPPT Solar Controller?
MPPT circuit solar controllers are considerably more elaborate than PWM. The voltage of the solar panel changes with time of day and temperature. The optimum voltage for battery charging changes as the state of charge of the battery. The MPPT charge controller matches these voltages and can result in 30% more efficient transfer of power. This means good MPPT solar charge controllers can reduce the number of solar panels needed by up to 30%- a tremendous benefit. Even if the excess panels are purchased, benefits are realized in a Grid Tie system because more electricity can be sold back to the grid. While only a small part of system price, a MPPT solar panel charge controller can leverage the rest of the system to better performance.
Specification:
Rated system voltage
12V/24VDC
Max open circuit voltage of solar
panel
15-42V DC
Max solar panel power
275W 12V/550W 24V
Max output current
20A
Max discharge current
20A
Over discharge current
10.2-12.5V(±0.2)12V/20.4-25.0V(±0.2)24V
Restart voltage
10.3-13.5V(±0.2)12V/20.5-27.0V(±0.2)24V
Constant voltage(Over charge)voltage
13.0-15.5V(±0.2)12V/26.0-31.0V(±0.2)24V
Float voltage
12.5-14.5V(±0.2)12V/25.0-29.0V(±0.2)24V
Converter type
Buck
Converter efficiency
>96%
Max increase efficiency
>43%
Tracking efficiency
>98%
Precision of clock
±50S/Month
Charging algorithm
PWM 3 stage:impulse,bulk and float
Five output modes
Manual,Standard;Timer;Light sensor;
Light sensor on +Timer off
Main body
Fully aluminum housing
Standby power consumption
<15mA 12V / <25mA 24V
Operating temperature
-20
℃
+50
℃
Protect class
IP22
Weight
0.51kg
Package includes:
1PCS 20A MPPT
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About us
We are manufacturers and wholesalers of the mechanical and electronic products.
The business has been established since 2005.
Our engineers are experienced in mechanical and electronic products and related accessories, if you buy from us you deal with not just a seller, the whole keep on going technical team is behind you and your business. OEM and ODM services are both available. We would like to be your best supplier in China.
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