Typical Features of Solar Charge Controller for 12V, 5A

• Optional Dawn/ Dusk option
• PWM charging for better power transfer from SPV panel to battery.
• Early Low battery alarm when battery voltage is less than 11.3V.
• Low battery cut when battery voltage is less than 11.0V
• Electronic Blocking (To protect against the reverse polarity connection of PV panel and prevent current from battery to panel at night time.)
• Built in microprocessor for efficient PV charge control.
• Temperature compensation for better battery charging for various climate and terrain.
• Battery reverses polarity protection with fuse.
• 3 LED indication systems for system and battery status.
• Efficient Over charge and deep discharge protection.
• Electronic overload protection avoiding blowing of fuse except in reverse battery.
• Short circuit proof on load side.
• Multi level overload protection.
• Overload at 20 sec when load current is greater than 5A and less than 7.5A
• Overload at 4 sec when load is greater than 7.5 A and less than 10A
• Overload at 2 sec when load is greater than 10A and less than 15A
• Instantaneous overload when load current is greater than 15A

What is PWM charging?

Pulse Width Modulation (PWM) charging is the most effective means to achieve constant voltage battery charging by switching the solar system controller’s power devices. When in PWM regulation, the current from the solar array tapers as recharging needs. Charging a battery with a solar system is a unique and difficult challenge. In the “old days,” simple on-off regulators were used to limit battery out gassing when a solar panel produced excess energy. However, as solar systems matured it became clear how much these simple devices interfered with the charging process.

The history for on-off regulators has been early battery failures, increasing load disconnects, and growing user dissatisfaction. PWM has recently surfaced as the first significant advance in solar battery charging. PWM solar chargers use technology similar to other modern high quality battery chargers,. When a battery voltage reaches the regulation set point, the PWM algorithm slowly reduces the charging current to avoid heating and gassing of the battery yet the charging continues to return the maximum amount of energy to the battery in the shortest time. The result is a higher charging efficiency, rapid recharging, and a healthy battery at full capacity. In addition, this new method of solar battery charging promises some very interesting and unique benefits from the PWM pulsing. These include:

• Ability to recover lost battery capacity and de-sulfate a battery.
• Dramatically increase the charge acceptance of the battery.
• Maintain high average battery capacities (90% to 95%) compared to on-off regulated stateof-Charge levels that are typically 55% to 60%.
• Equalize drifting battery cells.
• Reduce battery heating and gassing.
• Automatically adjust for battery aging.
• Self-regulate for voltage drops and temperature effects in solar systems.

What is the benefit of PWM charger over a normal charger?

The benefits noted above are technology driven. The more important question is how the PWM technology benefits the solar system user.

Longer battery life:

• Reducing the costs of the solar system
• Reducing battery disposal problems

• Increasing the reliability of the solar system
• Reducing load disconnects
• Opportunity to reduce battery size to lower the system cost

• Get 20% to 30% more energy from your solar panels for charging
• Stop wasting the solar energy when the battery is only 50% charged
• Opportunity to reduce the size of the solar array to save costs

Greater user satisfaction:

Get more power when you need it for less money

Brief Technical Specification

Operating Voltage : 12, 24, 36, 48 VDC

Load Current : 10A-40A / Charging Current : 10A-40A

Charging Method : CC/Boost (with PWM)/ Float

Temp. Compensation : With built in sensor

Load Terminal : 3 Nos

Standby Current : <5 ma

Charging indication : True charging type with flashing LED indicating Battery status.

a) Short flashing of LED indicates the battery voltage level. Flashing with longer off time indicates low battery voltage and flashing with short interval indicates battery voltage near about the PWM voltage.

b) Equally spaced ON/OFF of the LED indicates PWM charging.

LVD indication: a) Early indication with blinking LED

b) Disconnection Indication with glowing LED