PWM MPPT Controller Charging Boiler Heater for Solar Photovoltaic Panels Controller

Model: ACTii AC7391

EAN: 6931240073919 SKU: 739155867

• 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 regulator 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.
• The controller displays: Voltage (V), Power (W) transferred to the heater, Water temperature in the boiler
• The regulator can be turned off and on (plus and minus buttons)
• Blinking of the OUT diode signals the transfer of current to the heater
• Relay output informing about the heater heating interruption. They can be used to connect external devices
• The device is mounted on a TH35 DIN rail
• The controller has thermal protection and active cooling depending on the temperature of the actuator and power.
• For safety reasons, the high-voltage part is galvanically separated from the power supply.
• Two operating modes: Automatic mode, Mode with the possibility of setting the activation voltage thresholds
• Possibility to connect a wind turbine instead of a photovoltaic panel
• Made in the EU, has a CE certificate

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 heaters for domestic hot water 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.

The regulator is supplemented with a buffer module containing capacitors, choke and diodes, which enables higher efficiency (up to 30%) and reduction of disturbances caused by PWM regulation.

The regulator 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: 11V to 14.4V

Panels voltage: From 10V to 400V DC

Panels current: MAX 10A

Maximum heater power: 2kW

Maximum power of panels: 2kW

The current drawn from the power supply without cooling: 0.08 A

The current drawn from the power supply with cooling: 0.23A

Temperature measurement accuracy of 0.1 degrees

Modes of operation

The regulator has the ability to change the mode to work in the area between min and max voltage. This option is especially useful for wind farms.

Mode one:

It is fully automatic and starts working as soon as it is connected. When the input voltage exceeds the minimum voltage threshold (MINUS button), the controller begins to send current to the heater using the MPPT maximum power point search algorithm.

If the voltage drops below the minimum value, the MPPT search is stopped and the current to the heater stops flowing. Setting the minimum value makes it possible to freely heat water and, at the same time, to charge the batteries.

Second mode:

Possibility to set the activation voltage thresholds (from which the PWM value starts to increase) and the maximum voltage (from which the duty cycle is 100%), i.e. the entire energy of the cells goes directly to the heater.

In addition, the use of this method allows the panels to be kept at the MPPT (highest power point), and is especially useful for wind farms. In this case, it prevents excessive acceleration of the turbine and allows it to start freely.

Additional information

Controller dimensions: 90x54x64mm

Buffer dimensions: 90x36x64mm

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 about 2700W for PV 140V 7.14A panels.

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

Kit contents

Regulator

Buffer

Package

Instruction

Temperature sensor

Cable connectors

Certificates and standards

CE, RoHS

Dimensions, Weight

Product dimensions: 90 x 54 x 64 mm (D x W x H)

Packaging dimensions: 100 x 120 x 60 mm (D x W x H)

Product weight: 330 g

Weight with packaging: 376 g

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