Solar System Battery Monitoring Relay & Auto Start

DC UNDERVOLTAGE MONITORING RELAY -  AUTO START & STOP PROGRAMMABLE DELAYS 0 SEC UP TO 24 HOURS

HIGH PRECISION 0/400Vdc - QUARTZ TIMING ACCURACY  - STATIC OUTPUT  - RAIL MOUNT  - 8/30V SUPPLY

When the battery voltage drops below the [VT-] setting, the BE48 energizes the output. You can connect a 12V small relay or you can directly connect the output to the generator AUTO START module. In this way, the engine will start. Once the battery voltage will rise above the [VT+] setting, the output will de-energize. Consequently, the engine will stop. You can set timers to delay the start [T1] or to delay the stop [T2]. These timers can be adjusted from zero second up to 24 hours. By adjusting these 4 parameters ([VT-], [VT+], [T1], and [T2]) you can get a great system flexibility. A software that allows you to setup the parameters is provided free of charge. If necessary (for example the battery is not able to reach the [VT+] level) you can set up a TIME-OUT timer that shutdown the system. In this case a manual reset, by removing the DC supply, is necessary to restart the module.

Be48 Battery Monitoring Auto Start Relay Wiring Diagram

The connections of the Be42 module are really simple to understand and easy to make. The supply is usually connected to the battery of the power generator. It could be 12V or 24V. The output is 'STATIC' via a NPN transistor and voltage regulator. Output rating is 12V 100mA. You can connect a small automotive relay or you can directly connect the output to the REMOTE START input of your engine AUTO START module. The RS232 port is used to configure the settings of the module. To allow Battery Voltage measurement, you are required to connect the terminals 40-400 for high voltage battery or 0-60 for low voltage battery. The module can support reverse polarity for unlimited time. We always recommend to protect the wires using a 1-AMP fuse 5X20mm size for low volatge and a 4 Amp 10x38mm size for high voltage battery. The BE48 allows floating or "grounded" batteries.

Battery Monitoring Relay Mechanical Details

The Be48 Battery Monitoring Relay is intended for DIN rail mount inside a control panel. We recommend that you choose the vertical position. The Be48 works in wide operating temperature range of about -25 up to 70 degrees Celsius. Total weight is about 240 gr.

How to configure the Battery Monitoring Relay

We provide a free of charge software that allows you setting up the module. You can set Voltage thresholds and various timings. When the precision is mandatory, you can calibrate down to zero the measurement error. This will compensate ground loop errors, noise and miscellaneous error sources. The software provides accurate reading of the power supply as well. We recommend that you write the settings on the right side of the Be48 module. Normally, the power supply voltage is connected to the battery of the generator. Battery System is usually a backup battery pack of a solar system. This could be in the range 0 up to 400V.You can connect the computer at anytime without affecting the system. When you set up the system you can test the output by using the ON-SCREEN test button.

VOLTAGE MONITORING RELAY OVERVIEW

After connecting cables and power supply, you are required to run the BE48 VOLTAGE MONITORING configuration software. The software automatically search for a USB serial connection. A green message 'CONNECTED' will indicate the communication between BE48 and your computer. The software provides measurements of the power supply voltage and battery system voltage.

VOLTAGE MONITORING RELAY SETTINGS

The basic available commands are SAVE (to store a parameter, DEFAULT (to use factory settings) and RELAOD (it cancels a modification and restore the previous setting). If you modify a parameters, a yellow backgroud will warn you. Once stored in the memory the yellow background wll disappear. Low Voltage Start is the voltage level of the battery that triggers the timer T1 (once T1 expires, the engine starts). High Voltage Stop is the voltage level of the battery that triggers the timer T2 (Once T2 expires, the engine stops).

VOLTAGE MONITORING RELAY TIMIMG SETTINGS

START & STOP delay timers are extremely usefull to provide flexibility to your application. You can use these two timer to avoid false start and stop commands. As a matter of fact the voltage comparator itself has no response delay. It works immediately. This may cause a system instability. You can put, anyway, the timers to zero at anytime. This can be usefull in particualr applications in which you need an extreme fast respomse of the voltage comapator. Or you need to carry out a test of the system without delays.

VOLTAGE MONITORING RELAY SHUTDOWN SETTING

This additional timer is extremely important when you want to add security to your system. If there is a failure on the charger, you will never be able to charge the battery. The generator will run for hours without benefit in return. This timers limits the run time of the engine. One the BE48 triggers the alarm, you are required to remove the power supply for a few seconds to restart the module.

CALIBRATING THE MONITORING VOLTAGE RELAY

Factory precision of the measurements is about 2%. If this error is not accettable, we recommend that you carry out the calibration. This is really simple. You will put a precise measurement instrument on the battery and yu will take note of the measurement. Then, you will type on the screen the value. After pushing the button 'SAVE', the Be48 will calculate the correction factor. You will get in a few seconds the reading with approximately 'NO ERROR'. A good calibration will allow you a 0,1% accuracy. The calibration is stored in a NON VOLATILE memory.

VOLTAGE MONITORING LOG HISTORY

If you want to carry out really accurate testing of the system, the BE48 provides real time data logger. By analyzing the TIME STAMP you can find out if the sysem works as you expect.