TriStar MPPT 600V Installation & Operation Manual

39TriStar MPPT 600V Operator’s Manual
4.2 Battery Charging Information
4-Stage Charging
TheTriStarMPPT600Vhasa4-stagebatterychargingalgorithmforrapid,efcient,andsafe
battery charging. Figure 4-0 shows the sequence of the stages.
NIGHT
NIGHT
BULK
CHARGE
ABSORPTION
FLOAT
EQUALIZE
VOLTAGE
TIME
Figure 4-0. TriStar MPPT Charging Algorithm
Bulk Charge Stage
During Bulk charging, the battery is not at 100% state of charge and battery voltage has not yet
charged to the Absorption voltage set-point. The controller will deliver 100% of available solar
power to recharge the battery.
Absorption Stage
When the battery has recharged to the Absorption voltage set-point, constant-voltage regulation
is used to maintain battery voltage at the Absorption set-point. This prevents heating and exces-
sive battery gassing. The battery is allowed to come to full state of charge at the Absorption volt-
age set-point. The green SOC LED will blink once per second during Absorption charging.
The battery must remain in the Absorption charging stage for a cumulative 120 - 150 minutes,
dependingonbatterytype,beforetransitiontotheFloatstagewilloccur.However,Absorption
time will be extended by 30 minutes if the battery discharges below 50 Volts the previous night.
The Absorption set-point is temperature compensated if the RTS is connected.