Victron Energy SmartSolar MPPT 100/20 Solar Charge Regulator 12/24V 20A

MPPT: Ultra-fast Maximum Power Point Tracking.
By continuously monitoring the voltage and current output of your solar (PV) modules, MPPT technology ensures that all available energy is actually being drawn from the modules and stored. The benefit of this is most noticeable when the sky is partially overcast and the light intensity is constantly changing.

Features
Suitable for 12V/24V/48V systems
Short circuit proof load output
Intelligent battery management with Battery Life
Programmable battery charging algorithm
Day/night timing and light dimming option
Intelligent VE.Direct data communication port for connection with auxiliary devices such as Bluetooth Smart Dongle or GX Color Control Panel
Integrated output short circuit / over temperature protection
Remote monitoring and control
You can remotely control and monitor the extensive features of your BlueSolar MPPT charger by attaching a Bluetooth dongle and pairing it with your smartphone or other device via VictronConnect. If your system is connected to the Victron Remote Management Internet portal (VRM) via a GX device, you have full access to your MPPT anytime, anywhere. Both VictronConnect and VRM are available free of charge.

Load output
Too deep discharge of the battery can be prevented by connecting all loads to the load output. The load output disconnects the loads when the battery has been discharged to a preset voltage value. Alternatively, an intelligent battery management algorithm can be selected: see Battery Life.
The load output is short circuit protected. Some loads (especially inverters) are best connected directly to the battery. Inverter remote control is best connected to the load output. A special interface cable may be required, please refer to the manual.

Battery Life: Intelligent battery management
If the solar charge controller is not able to charge the battery to its full capacity within one day, the battery status will constantly alternate between "partially charged" and "end of discharge". This mode of operation (no regular full charging) damages a battery within a few weeks or months.
The Battery Life algorithm monitors the battery's state of charge and, if necessary, raises the load disconnect threshold day by day (i.e., disconnects the load earlier) until the energy gained is sufficient to charge the battery to near 100%. From this point on, the threshold for disconnecting the load is modulated so that charging to nearly 100% is achieved about once a week.