HQST 100A MPPT Solar Charge Controller 12–48V — Bluetooth, LCD Monitoring, LiFePO4 Protection

Designed for residential and off-grid solar systems, the HQST 100A MPPT controller combines advanced maximum power point tracking with user-friendly monitoring to squeeze more usable energy from PV arrays. It supports 12V/24V/36V/48V battery banks, offers adjustable battery profiles, and includes temperature-aware safeguards—helpful for protecting lithium iron phosphate (LiFePO4) and various lead-acid chemistries.

How does this controller increase solar charging efficiency?

The HQST 100A uses modern MPPT algorithms to continuously optimize the voltage-to-current conversion from solar panels to batteries, delivering higher harvest than PWM controllers. Peak conversion efficiency reaches about 98.7% with tracking efficiencies up to 99%, reducing wasted generation across changing light conditions.

• MPPT tracking adapted to variable irradiance for steady power capture
• Supports wide input ranges for larger PV arrays and higher Voc
• Selectable battery types to match charge profiles for maximum retention

What monitoring and controls can I access from a phone or locally?

Built-in Bluetooth lets you pair the controller with HQST’s mobile apps (ChargePro 2.0 or PVChargePro) to view real-time data and historical logs. The unit’s front LCD and control buttons provide local status, parameter adjustment, and quick diagnostics without a smartphone.

• Bluetooth connectivity for remote monitoring within about 10 m (33 ft)
• App stores up to 300 days of operation history for trend review
• On-device LCD shows key metrics and allows direct parameter changes

How does it protect batteries, especially LiFePO4 types?

The controller includes multiple protections tailored to battery chemistry, including low-temperature cut-off settings for LiFePO4 to prevent charging or discharging at unsafe temperatures. Users can enable or disable low-temp cut-off and can use the controller to revive over-discharged LiFePO4 packs.

• Low-temp charge cut-off below 32°F and discharge cut-off below 5°F for LiFePO4
• Manual switch to activate or deactivate low-temperature protections
• Safety suite: overcharge, overcurrent, over-voltage, reverse polarity, overheating protections

Can I scale the charging current for larger systems?

If you need more charging current for a single battery bank, multiple HQST MPPT controllers can run in parallel so they feed the same battery pack. This lets you expand system capacity without reworking the PV array layout.

• Parallel support up to nine compatible MPPT controllers for higher aggregate current
• Requires parallel charge cabling (not included) and matching battery voltage settings
• Useful for staged upgrades—add controllers instead of replacing the entire inverter/charger

Who is this for? The HQST 100A MPPT Charge Controller is aimed at DIYers, van/RV and marine users, small off-grid homeowners, and installers who need a robust, expandable controller with modern monitoring. It fits systems that require flexible voltage support (12/24/36/48V), chemistry-specific charging (LiFePO4 and lead-acid variants), and those planning future capacity growth using parallel controllers. Choose this unit if you want high MPPT efficiency, Bluetooth/LCD oversight, and built-in safety features without complicated setup demands.