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AS 4509.2-2010
What an MPPT Charge Controller Does
A Maximum Power Point Tracking (MPPT) charge controller converts the variable high voltage from the PV array into the correct charging voltage and current for the battery bank, while continuously tracking the array's maximum power point. It is the critical link between the solar array and the battery in a standalone power system.
Key Selection Parameters
Parameter | What to Check |
|---|---|
Maximum input voltage | Must exceed the array VOC at minimum site temperature — typically 150 V or 250 V for 48 V systems |
Maximum input current | Must exceed the array ISC — typically array ISC × 1.25 for safety margin |
Maximum charge current | Determines how quickly the battery can be charged — must match battery maximum charge rate |
Battery voltage range | 12 V, 24 V, 48 V, or auto-detect. Confirm compatibility with your battery bank voltage |
Operating temperature range | For remote outback applications, ensure controller operates at >50°C without derating |
Communication | Modbus, CANBUS, or proprietary for monitoring integration |
Charge Profile Programming — Lead-Acid
For flooded lead-acid batteries, the charge controller must be programmed with the correct charge voltages per the battery manufacturer's datasheet:
Bulk voltage: Maintain until battery reaches 80% SoC (current-limited at bulk current setting)
Absorption voltage: Held constant while current decays to typically C/20. For 12 V FLA: 14.4–14.8 V
Float voltage: Maintenance charge to offset self-discharge. For 12 V FLA: 13.2–13.6 V
Equalisation voltage: Periodic overcharge. For 12 V FLA: 15.5–16.0 V
Charge Profile Programming — LiFePO4
LiFePO4 batteries must have a lithium-specific profile — using a lead-acid profile on a lithium battery will either undercharge (lead-acid float voltage is too low for lithium) or overcharge (lead-acid absorption voltage may exceed lithium cell maximum). Use the battery manufacturer's specified voltages, which are typically managed automatically when the BMS communicates with a compatible MPPT controller via CAN bus.
Engr. Jason Morales — Founder, SolarEnergyPH
