DESCRIPTION

        The SD series devices have been developed by Soluciones Energéticas to cover the control and regulation necessities of small/medium power range stand alone photovoltaic systems. Their main technical characteristics are the following:

- Series type regulation with microprocessor control and solid state relays.

- One input stage and one output stage, 30A in each.

- Nominal voltage: 12 or 24 Volts

- Regulation system using deep charge and flotation, allowing periodic equalizing charges in automatic and manual modes

- The battery voltage control lines are independent from the power lines, thereby avoiding errors in voltage measurement caused by the high currents that can flow through the battery line. If this line fails, it has a redundant internal connection  so that correct operation may continue until the problem is solved.

- Load disconnection due to low battery voltage, with automatic reconnection.

- Load operation threshold compensation due to temperature fluctuations with the temperature measured using an incorporated temperature sensor.

- Alphanumeric LCD display (4 rows x 16 characters) showing the following parameters: system voltage, current in the generation stage, current in the load stage, Ah generated and consumed, Wh generated and consumed, total accumulated and partials, temperature, charge balance, etc.

- Indication of the state of charge and local alarm warnings of low and high battery state of charge using LEDs and the display.

- Alarms for: low and high battery voltage, PV module generation fault, general system fault and starting of the auxiliary generator.

- Predefined battery voltage table in the software with the option of password protected value modification

- Waterproof box with transparent front panel.

- Protection against overvoltage in the power input and control lines.

- Self protection against excess current and temperature.

- Protection against battery disconnection.

- Protection against polarity inversion in the power and control lines.

- Protection against disconnection and short circuit of the temperature sensor.

- Two languages of the displayed information: Spanish and English. French and German coming soon.

- Tropicalization of the circuits.

- RS-232 line. This line allows the adquisition of system information via modem and even remote parameter modification.

- ISPRA reports generation through the RS-232 line, with a user defined interval.
 
- Remote signalling of the alarms using isolated relay contacts.
 

        DISPLAYED INFORMATION

        When the device is switched on, the version and serial number will be displayed for a few seconds; another screen will then appear showing the address and the phone number of the manufacturer (Soluciones Energéticas) or the distributor (in the OEM version). This screen will be shown for a few seconds and will reappear every four information cycles. If the screens are changed manually, this information is not shown.

        Once these first screens disappear, the charge controller will start its normal operation and information will be displayed in the screen in a cycle of a predefined interval, this cycle will show information about the temperature, currents, instantaneous powers, energy generated, etc. Each of these screens is briefly described below:

        Battery state: shows the battery voltage and state of charge, the charge phase of the controller is also shown (gassing charge, floating, etc).

        Storage: shows the instantaneous value of the total generation current, the Ah/day accumulated at the time of consultation and the balance (Ah generated - Ah consumed). This last parameter provides a relative indication of the state of charge of the battery.

        Load current: provides information about the instantaneous and maximum load current.

        Generation current: provides information about the instantaneous and the maximum generation current.

        Load power: shows the instantaneous and maximum load power.

        Generation power: shows the instantaneous and maximum generation power.

        Energy (Wh): shows the energy generated and the energy consumed since the device started operation or the counters where last reset.

        Alarms: inform about the state of the device alarms. The alarms screen has two rows in which the remote alarmas of the device are shown (K1-K4) followed by the message "SI" ("YES") if the alarm is activated or "NO" ("NO") if the alarm is not activated.

        System: provides information about the device: serial number and software version.

        Temperatures: shows the instantaneous, minimum and maximum temperatures since the device started operation or since the registers where last reset.
 

        LIGHTING INDICATORS

        The charge controller has five indicators (LEDs) that allow the user to obtain direct, visual information about the state of charge of the batteries. From top to bottom:

        - Red LED: overcurrent.

        - Yellow LED: activates when the battery voltage is higher than or equal to the maximum battery voltage value allowed for more than 10 seconds. The High Battery Voltage alarm switches off when the battery voltage drops below the End of High Battery Voltage threshold.

        - Green LED: shows the state of the solid state relays of the generation circuit. No light means closed relay (conducting).

        - Yellow LED: activates when the battery voltage is lower than the minimum battery voltage value allowed for more than 10 seconds. The Low Battery Voltage alarm switches off when the battery voltage rises above the End of Low Battery Voltage threshold.

        - Red LED: output disconnected.

    During charge controller operation in flotation or equalizing phases, the green LED will blink, indicating that the charge controller is connect and disconnecting the generation stages to maintain the battery within the predefined voltage thresholds.