Quick Overview:

A solar charge controller manages the power going into the battery bank from the solar array. It ensures that the batteries are not overcharged during the day and that the power doesn’t run backwards to the solar panels overnight and drains the batteries. Some charge controllers are available with additional capabilities, like lighting and load control, but managing the power is its primary job.

A solar charge controller is available in two different technologies, PWM and MPPT. Potentially increase the charging efficiency by 30% in MPPT based product.

SOLAR Management UNIT (ISIU-12/24V-40Amp)

SMU is independent charge controller that has the capability to interface with any existing inverter of any make to convert it into a solar inverter. It also has the feature to disconnect the mains(only if PV is available) when battery is charged up to the boost voltage (selectable),during this time the load is driven by the battery(s) and then reconnect the mains when battery voltage reaches <11.8V.

The current delivered by ISIU is the additive current to battery given along with the normal charging current given by the inverter to charge the battery.

  • Protection from reverse current flow battery to solar array during night.
  • Self-diagnostics and inbuilt protection features to prevent damages by incorrect terminations, system shorts or connections.
  • MOSFET based series PWM/MPPT charging technology for improved battery life and maximum


  • Automatic detection of system voltage
  • Use of MOSFETs avoids the use of mechanical relays that are prone to failures
  • Can be adapted to different battery types.
  • Inbuilt temperature detection and compensation for the battery to maintain battery life
  • Over charging protection, overheating protection, over discharge protection,overload protection and reverse polarity protection.
  • ISIU saves electrical energy by charging the battery as well as supporting the load using the solar energy. Maximum Solar Power Utilization during charging and backup mode.
  • Automatic 12V/24V Battery Sensing Capability.
  • LED indications for better system information
  • Compatible with any Home Inverter/UPS (12V/24V).
  • Controller based design with absolute and stable operation for managing the solar power and mains with respect to battery voltage.
  • User friendly operation and selector switch control with LED indication on front panel. Selector switch is for selecting the charging mode.
  • Deep discharge battery charging from solar.