PWM MPPT 3KW Heater Charging Controller for Solar Solar Panels

Model: ACTii AC7392

EAN: 6931240073926 SKU: 739260731

• PWM controller for heaters with the algorithm of searching for the maximum MPPT power point from photovoltaic panels. The controller enables the supply of standard DHW electric boilers from solar panels
• The controller is equipped with a temperature sensor, which allows you to stop heating the boiler above the set temperature. It is possible to change the set temperature.
• Two displays - one displays the current DHW temperature, the other shows the current power by default or, after switching, the voltage from the panels and the peak power.
• Built-in payload buffer. It enables higher efficiency (up to 30%) and reduction of disturbances caused by PWM regulation. Transistors with a large margin (ensure long, trouble-free operation)
• The regulator is powered from PV panels. There is no need to connect an external power supply. (RJ45 socket can also be used to power the controller when there is no voltage from the panels)
• Large heat sink for passive cooling, eliminating the need for a driver fan
• The controller has thermal protection and active cooling depending on the temperature of the actuator and power.
• RS485 communication port for reading operating parameters from a computer.
• Temperature control of the heat sink and the inside of the housing. Built-in acoustic alarm
• The regulator can be turned off and on (plus and minus buttons)
• Relay output informing about the heater heating interruption. They can be used to connect external devices
• Made in the EU

Description

PWM controller for heaters with the algorithm of searching for the maximum MPPT power point from photovoltaic panels.

The controller enables the supply of standard DHW electric boilers from solar panels

The solar panel works at maximum power only at optimal voltage. Connecting the heater directly to the photovoltaic panel causes too high a load on it and, as a result, a voltage drop. At reduced operating voltage, the panel produces even several times less current than at optimal voltage. The use of a charge regulator eliminates this problem. Even on cloudy days, it will be possible to heat the water in the boiler.

Built-in charge buffer, which enables higher efficiency (up to 30%) and reduction of disturbances caused by PWM regulation.

The controller is equipped with a temperature sensor, which allows you to stop heating the boiler above the set temperature.

The device has been equipped with an additional relay output (potential-free), which allows external devices to be notified that water heating has been completed (the set temperature has been reached) or that there has been a device failure. This output allows you to connect additional devices.

Specification

Parameters

Supply voltage: power supply to the controller from PV panels

Panels voltage: From 10V to 350V DC

Panels current: MAX 13A

Maximum heater power: 3kW

Maximum power of panels: 3kW

Current consumption: 0.08 A.

Temperature measurement accuracy of 0.1 degrees

Mode of action

Configuration consists in setting the desired temperature to be achieved by utility water. This is done by pressing the MENU button until is displayed

intermittent sound from the driver. Then, the inscription "S.tE" appears on the upper display, which means setting the preset temperature. It is possible to reduce the voltage starting the operation of the regulator, but this option is recommended when an external power source is used. The starting voltage can be reduced by holding down the minus button until an intermittent signal from the buzzer appears. The default start voltage is 150V.

Switching the regulator on and off:

The regulator can be turned off by briefly pressing the MINUS button (voltage is no longer supplied to the heater)

Switching on is done by briefly pressing the PLUS button. By default, after turning on the power, the controller automatically starts to work (feeding current to the heater using the algorithm of searching for the maximum power point MPPT.) If the voltage exceeds the minimum value. The regulator can work only with photovoltaic installations, it cannot be used with wind turbines. The regulator, apart from the settings described above, does not require additional maintenance. Adjustment of operating parameters is automatic and depends on the capabilities of the panels and the load. The regulator must be loaded ONLY with heaters used in boilers. Air resistance heaters or other electronic devices must not be used.

Additional information

Temperature sensor cable length: approx. 100 cm

What heater should I use AC or DC and what power?

As the resistance is the only parameter that describes the heater, you can use an AC or DC heater.

The heater should be matched to the photovoltaic panels.

If your PV panels are rated at 140V DC 7.14A 1000W, a 140V DC heater with 1000W will be the most appropriate.

but you can also use a 230V AC or 110V AC heater. You only need to adjust the heater's power to the PV panels. (we provide an online calculator to calculate the correct heater).

Accordingly, (because the heater's resistance and current intensity are the only parameters of the heater), it is possible to adjust the 230V heater to work with PV panels with a different voltage, using Ohm's law. 140V / 7.14A = 19.61 Ohm. Our heater is to have 19.61 Ohm. For the 230V heater, P = U * U / RP = 230 * 230 / 19.61 = 2697W. We can therefore use a 230V AC heater with a power of approximately 2700W for PV panels of 140V 7.14A.

The heaters can have two independent coils. One spiral can be used to heat water from PV panels and the other from 230V mains.

During normal operation, the display shows the following parameters, the current power and the DHW temperature. Blinking OUT diode signals that power is being supplied to the heater.

The device has been equipped with an additional relay output (potential-free), which allows external devices to be notified that

water heating has been completed (the set temperature has been reached) or the emergency mode has been entered (failure of the actuator).

Kit contents

Regulator with load buffer

Package

Instruction

Temperature sensor

Cable connectors

Certificates and standards

CE, RoHS

Dimensions, Weight

Product dimensions: 130 x 140 x 120 mm (D x W x H)

Packaging dimensions: 140 x 150 x 140 mm (D x W x H)

Product weight: 1130 g

Weight with packaging: 1200 g

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