HQST 100A MPPT Solar Charge Controller – 12-48V Negative Ground, Bluetooth App, LCD Display

HQST 100A MPPT Solar Charge Controller

Designed for flexible off‑grid and mobile setups, the HQST 100A MPPT controller supports 12V to 48V systems and a wide range of battery chemistries, including LiFePO4, sealed, AGM, GEL, and flooded options. The negative grounding design adds installation versatility for vehicles, cabins, sheds, and marine use.

Negative grounding provides broader compatibility with different installations, while the built‑in Bluetooth module pairs with the ChargePro 2.0 or PVChargePro apps for real‑time monitoring. An LCD display on the unit lets you view operating data and adjust parameters on the spot, with effective use within a roughly 10m (33ft) range in open space.

Smart monitoring and on‑device control

Track voltages, currents, temperatures, and charging status in real time. The app stores up to 300 days of historical data, helping you analyze trends and plan maintenance without guesswork.

Low‑temperature protection for LiFePO4

Low‑temp cut‑off prevents charging below 32°F and discharging below 5°F for LiFePO4 batteries. The function can be toggled, and it also helps wake dormant LiFePO4 cells that have turned off after deep discharge.

High‑efficiency MPPT charging

MPPT tracking efficiency can reach up to 99%, with a peak conversion rate up to 98.7%. This can help maximize energy from solar panels across 12/24/36/48V systems and is compatible with LiFePO4, sealed, AGM, GEL, and flooded batteries.

Expandability and scalability

Use the parallel charge extension feature to connect up to 9 controllers to charge the same battery bank, ideal for higher power needs. Ensure all controllers share the same battery voltage setting for safe operation.

Reliability and safety features

Two active cooling fans engage when power rises or temperatures climb, maintaining performance. Ten protections guard against overcharging, over‑voltage, over‑current, overheating, reverse polarity, and more for dependable operation.

Real‑world use cases

• RVs, boats, or off‑grid cabins needing compact, reliable power management with easy app monitoring.
• Growing solar setups that benefit from scalable parallel charging without reworking the entire system.

Key benefits at a glance

• Bluetooth connectivity and LCD display for convenient monitoring and adjustments.
• Broad battery compatibility, including LiFePO4, with cold-weather options.
• High MPPT efficiency to maximize energy capture from solar panels.
• Expandable architecture with parallel controllers for bigger charging needs.
• Active cooling and robust protections for safer, longer operation.