45A MPPT Solar Charge Controller Model:SUN-MPPT-4515A

Features of MPPT Charge Controller

1 - Battery Status LED Indicator

An LED indicator that shows battery status or system errors.

2 - Charging Status LED Insdicator

An LED indicator that shows charging status and overvoltage of pv.

3 - Setting Button1

Set load work mode,battery type and max charge current.

4 - Setting Button2

Set load work mode,battery type and max charge current(in manual mode used for

load ON/OFF).

5 - LCD Digital Display

Dispaly the system status

6 - Wiring Box Cover

Sheet metal wiring box cover protects power connections

7 - FAN

FAN to dissipate Internal circuit heat

8 - Heatsink

Aluminum heatsink to dissipate controller heat

9 - Mounting Hanger

Keyhole slot for mounting

10 - Solar Module Terminals

Connect solar modules

11 - Battery Terminals

Connect batteries

12 - Load Terminals

Connect loads

13 - RJ45 Communication Interface(This feature is still in development,.Cannot use yet, )

Communicate with personal computer

4-Stage Charging

Bulk Charge Stage

In Bulk charging stage, the battery is not at 100% state of charge and battery voltage has not yet charged to the Absorption voltage setpoint. The controller will deliver 100% of available solar power to recharge the battery.

Absorption Stage

When the battery has recharged to the Absorption voltage setpoint, constant-voltage regulation is used to maintain battery voltage at the Absorption setpoint. This prevents heating and excessive battery gassing. The battery is allowed to come to full state of charge at the Absorption voltage setpoint. The Absorption setpoint is temperature compensated if the RTS is connected.

Float Stage

After the battery is fully charged in the Absorption stage, the MPPT reduces the battery voltage to the Float voltage setpoint. When the battery is fully recharged, there can be no more chemical reactions and all the charging current is turned into heat and gassing. The float stage provides a very low rate of maintenance charging while reducing the heating and gassing of afully charged battery. The purpose of float is to protect the battery from long-term overcharge.

Equalize Stage

The equalization stage will work 2 hours per month,this will extend the lifespan of the battery a lot.