PWM MPPT 3KW Heater Charge Controller for Solar Photovoltaic Panels

Model: ACTii AC7392

EAN: 6931240073926 SKU: 739260731

• PWM regulator for heaters with MPPT maximum power point tracking algorithm from photovoltaic panels. The regulator allows powering standard electric DHW boilers from solar panels
• The regulator is equipped with a temperature sensor, which allows for interrupting the boiler heating above the set temperature. It is possible to change the set temperature.
• Two displays - one displays the current DHW temperature, the other by default the current power or after switching the voltage from the panels and peak power.
• Built-in charge buffer. It allows for higher efficiency (up to 30%) and a reduction in interference 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. (The RJ45 socket can also be used to power the controller when there is no voltage from the panels)
• Large radiator ensuring passive cooling, so there is no need for a controller fan
• The regulator has thermal protection and active cooling depending on the temperature of the executive element and power.
• RS485 communication port allowing for reading operation parameters from a computer.
• Control of the radiator and housing interior temperature. Built-in acoustic alarm
• The regulator can be turned off and on (plus and minus button)
• Relay output informing about the interruption of heater heating. It can be used to connect external devices
• Made in EU

Description

PWM regulator for heaters with an MPPT maximum power point searching algorithm from photovoltaic panels.

The regulator allows powering standard electric DHW boilers from solar panels

A photovoltaic panel works at maximum power only at optimal voltage. Connecting the heater directly to the Photovoltaic Panel causes too much load on it and as a result a voltage drop. At a 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 water in the boiler.

Built-in charge buffer, which allows for higher efficiency (up to 30%) and a reduction in interference caused by PWM regulation.

The regulator has been equipped with a temperature sensor, which allows for interrupting the boiler heating above the set temperature.

The device has been equipped with an additional relay output (potential-free) allowing for notification of external devices that the water heating has been completed (reaching the set temperature) or that a device failure has occurred. This output allows for connecting additional devices.

Specification

Parameters

Supply voltage: controller powered from PV Panels

Panel voltage: From 10V to 350V DC

Panel current: MAX 13A

Maximum heater power: 3kW

Maximum panel power: 3kW

Current consumption: 0,08 A

Temperature measurement accuracy 0.1 degree

Method of operation

Configuration consists of setting the target temperature to be reached by the domestic water. This is done by pressing the MENU button until an intermittent sound is heard from the controller. Then "S.tE" appears on the upper display, which means setting the target temperature. It is possible to reduce the starting voltage of the regulator, however, this option is recommended when using an external power source. The start voltage can be reduced by holding the minus button until an intermittent signal is heard from the buzzer. The default starting voltage is 150V.

Turning the regulator on and off:

The regulator can be turned off by briefly pressing the MINUS button (voltage stops being supplied to the heater)

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

Additional information

Temperature sensor cable length: about 100cm

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

Since the only parameter describing the heater is resistance, you can use an AC or DC heater.

The heater should be matched to the photovoltaic panels.

If your photovoltaic panels nominally give 140V DC 7.14A 1000W, it will be most appropriate to use a 140V DC heater with 1000W power, but you can also use a 230V AC or 110V AC heater. You only need to match the heater power to the PV panels. (we provide an online calculator for calculating the correct heater).

According to the above, (since the only parameter of the heater is its resistance, and also the current intensity) it is possible to adapt a 230V heater to work with PV panels of a different voltage, using Ohm's law. 140V / 7.14A = 19.61 Ohm. Our heater is to have 19.61 Ohm. For a 230V heater P=U*U/R. P=230*230/19.61=2697W. For 140V 7.14A PV panels, we can therefore use a 230V AC heater with a power of about 2700W.

Heaters can have two independent spirals. One spiral can be used to heat water from PV panels and the other from the 230V grid.

During normal operation, the following parameters are displayed on the display: current power and DHW temperature. Flashing of the OUT LED indicates that power is being supplied to the heater.

The device has been equipped with an additional relay output (potential-free), allowing for notification of external devices that water heating has been completed (reaching the set temperature) or entering emergency mode (failure of the executive element).

Set contents

Regulator with charge buffer

Packaging

Manual

Temperature sensor

Cable connectors

Certificates and norms

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: 930 g

Weight with packaging: 950 g

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