Solar Products

PRISM PWM solar charge controller is a system with advanced MOSFET based microprocessor technology. The term “charge controller means either to a stand-alone device or a control circuit integrated a battery bank, solar pv module and a solar device. The PWM charge controller is for off-grid solar systems. This protects the battery from getting over charged using the solar module and over discharged by the loads. The charging process has been optimized for long battery life and improved system performance. The comprehensive self-diagnostics and electronic protections prevent damage from installation mistakes or system faults These chargers are called 'PRISM PWM solar chargers' as they do not have any diode drop of 0.7V. This is a MOSFET based design which has very negligible voltage drop of 0.05V Since the drop is less, the losses are negligible so the efficiency achieved is > 99.5%.
This is a micro-controller based charger, the micro-controller will sense the battery full charge voltage and will cut-off the battery when it reaches full charge. It will reconnect the battery if the battery drops to a preset level. The charger will also disconnect the panel from the battery, this is to avoid the reverse current flow from the battery to the panel during night. Moreover, if you connect the panel reverse, the micro-controller will not switch on the charger, similarly if you connect the battery reverse, the charger will not function. Battery reverse and panel reverse protections are incorporated in the design. If you connect both panel and battery reverse at the same time, the micro-controller will not switch on the charger. In all the above cases, the circuit will not damage and there will not be any current flow from the panel or battery. The design has opto-coupler based signal sensing which makes it completely isolated and there will be no grounding issues. Two stage higher voltage regulator is incorporated in this design to withstand open circuit voltage of the panel.

Priority Solar Charging

Our solar charger along with our inverter will have first priority solar charging. i.e, when it is charging from solar, it will not charge from the mains. Also, when it is charging from solar and battery is nearly full charged , the inverter will start working by disconnecting the mains bypass. So the solar power will go to the load through inverter and also charge the battery (online function) if the solar current is more than the inverter current. If solar current is less than the inverter current, inverter will take the balance current from the battery. When the battery reaches the reserve charge, inverter will stop and mains will bypass, and the battery will be charged by solar. During nights, if the battery is not charged from the solar, battery will charge from the mains but only to a certain percent . so the next day the battery can be charged from solar. If the battery is fully charged using mains the previous night then the solar energy during the next day will be wasted. This way the first priority is always given to solar.

Specification of PRISM PWM Solar Charger




10A - 80A


> 99.5%

PROTECTIONS AGAINST                 

Battery reverse

Panel reverse

Battery Overcharge (full charge cut-off level is settable)

Battery current reverse flow to panel (during nights)


Battery reverse

Panel reverse


Opto-Coupler output for Charging Live indication

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