#48 VOLTS SOLAR BATTERY FULL#

The 48V solar battery charger circuit with high, low cut-off is now set, however the value of the 100k resistor which can be seen connected between the input/output pins of the upper opamp actually decides at what lower threshold the relay must deactivate again, and switch ON the buzzer. When this happens the buzzer should shut off. Next, adjust the upper 10k preset very slowly and carefully until the relay just clicks. Now increase the input voltage to the desired high cut off level.

The A3 stage could also be replaced with an identical window comparator as discussed above for controlling the charging of the battery by setting up the presets appropriately, this would allow using all the four opamps from the IC LM324 and also make the operations much accurate and sophisticated. Once the thresholds are crossed, the BC546 is forced to conduct by the relevant opamp shutting down the mosfet and the load. Similarly A2 preset is set to make the relevant output go high at the higher threshold of 56V.Īt voltages between these 'windows', the BC546 remains shut off allowing the associated mosfet to conduct and feed the load with the required supply from the battery. The 100k preset is for adjusting the hysteresis level so that the situation gets latched until 48V is reached. The window comparator is made by two of the 4 opamps inside the LM324.Ī1 preset is set such that its output becomes high at the lower threshold level of 42V. Here the opamps are replaced by three op amps from the IC LM324. Once the discussed set up is implemented and power switched ON, the discharge level of the battery drags the supply to around 48V forcing pin2 of the IC to go below pin3 potential. It should adjusted such the the MOSFET just initiates and switches ON at the preferred low battery voltage threshold. The 22k preset is the hysteresis control for the circuit and also serves as the lower threshold adjustment preset.

#48 VOLTS SOLAR BATTERY FULL#

The 10k preset is adjusted such that the power mosfet cuts off when the connected battery reaches the full charge level. The IC 741 is configured as a comparator and is appropriately stabilized from the high 48V input using zener diodes and potential divider networks across its supply and input pins.Īs requested, the input voltage which may be in excess of 50v is acquired from a solar panel and applied to the circuit.

The functioning of the circuit may be understood with the following points: The proposed 48V solar battery charger circuit with high/low cut off feature can be witnessed in the following diagram.

48 volts solar battery