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About UTL’s SMU

A solar management unit (SMU) is a small and latest technology interconnecting device that allows its user to connect their existing inverter with a solar photovoltaic system. It converts an existing/normal inverter into a solar inverter so that you will not have to buy solar inverter separately. For this, just install the SMU between the solar panels and your existing inverter.

UTL’s solar management unit (SMU) is much smarter and efficient than other SMUs. It is more than 95% efficient and extracts all the available energy from the solar panels. The SMU will charge the solar battery automatically by using solar power. The UTL SMU has several plug-in and plug-out slots which allow it to connect with solar panel and solar inverter. SMU ensures the priority usage of solar power to reduce grid power consumption. The comprehensive self-diagnostics and extensive electronic protection can prevent damage against incorrect wiring or system faults.

UTL SMU is available in a 12 volt/24 volt power rating with 20 Amp and 40 Amp charging current capacity. It also has a wide operating range from 0°C to 50°C. The specialty of this device is that it can be installed with a 12-volt system and also with a 24-volt system. This solar management unit will automatically detect whether it is a single battery-based system or it is a system with a double battery. For this, you do not have to choose any switch or any other option.

UTL SMU Specifications

Particulars Description
Model SMU122440
Operating Temperature 0°C to 50°C
Storage Temperature -20°C to 60°C
Battery Type Tubular/SMF Battery (12V/24V)
Battery (Ah) 100Ah-180Ah
Battery Charging Regulation Method 4 Stage PWM (Bulk/Absorption/Float/Equalize)
Solar Module Size (Max.) 12V, 20A: Up to 300W

24V, 20A: Up to 500W

12V, 40A: Up to 500W

24V, 40A: Up to 1000W

Nominal  System Voltage 12V/24V DC
Charging Current (Solar) 20A/40A
Charge Controller Efficiency >95%
Idle Consumption <20mA
Operating Solar Input Voltage (Voc) 22.5V/45V
Maximum Solar Input Voltage (Voc) ±2V 25V/45V
Minimum Solar Input Voltage (Voc) @ start-up 15V/30V ± 2%
Solar Panel Recovery Voltage 17V/31V ±2%
Max. Solar Current 40A
Efficiency >95%
Absorption Voltage Tubular Battery 14.2V/28.4V ± 2%
Absorption Voltage SMF Battery 13.7V/27.4V ± 2%
Absorption Duration 3 Hours
Float Voltage Tubular Battery 14V/28V ± 2%
Float Voltage SMF Battery 13.5V/27.0V ± 2%
Bulk Voltage Tubular Battery 14.6V/29.2V ± 2%
Equalize Voltage 14.9V/29.0V ± 2%
Equalize Duration 3 Hours
Mains reconnect when Solar not Present At any Batt. Voltage
Mains reconnect when insufficient Solar Power ≤ 11.8V/23.6V ± 2%
Mains disconnect when sufficient Solar Power For Tubular ≥ 13.8V/27.6V ± 2%
Mains disconnect when sufficient Solar Power For SMF 13.7V/27.4V ± 2%
Display Parameters Batt. Voltage, Batt. Current, Batt. Type

Solar Voltage, Solar Current

Mode Selection

Solar status: Low, High, Absent

Max. PV Current

Protections Battery Reverse Polarity

Battery Reverse Current

Over Current of SPV

Solar High Voltage

SPV Reverse Polarity

Load Short Circuit through AC Fuse

Solar Low Voltage

Over Temperature

Ingress Protection IP-20
Fixing Wall Mounted
Weight 1.5kG
Dimensions (LxWxH) 9-Inch x 6-Inch x 3-Inch
Selling Price Rs.2,307


Features of UTL SMU

  • High speed and high-performance micro-controller.
  • Prioritize solar power over grid power.
  • High reliability with long operational life.
  • Inbuilt protection to avoid battery undercharge and over-charge.
  • Automatic /Manual operation through a switch.
  • Inbuilt PWM Technology Charge Controller.
  • Very low consumption in idle state.
  • Automatic voltage selection for 12V or 24V.
  • Compact design with wall mounting.
  • Eco-friendly solar product.


What is the operating temperature of the UTL solar management unit?

The operating temperature of the UTL solar management unit is 0°C to 50°C.


Why SMUs are used in a solar system?

SMUs are used only with existing or non-solar inverters. It is used to converts a normal inverter into a solar inverter.


Is there any warranty for this device?

Yes, there is 1 year’s complete warranty by UTL solar.


What is the price of SMU?

The price of UTL SMU is only Rs.2,307.


Can I install it with a double battery-based solar system?

Yes, you can connect UTL SMU with a double battery-based system.


What is the efficiency of UTL SMU?

UTL SMUs are more than 95% efficient.


Is it suitable for a Tubular solar battery?

Yes, UTL’s solar management unit is suitable for all types of solar battery including tubular solar batteries.

Top Solar Brands in India

We deal in all type of solar products like solar panelsolar batterysolar inverter, all types of solar systemsolar water heatersolar air conditioner, solar lights and solar pump.

We also deal in all reputed solar brands such as Tata SolarUTL SolarLuminous SolarSukam SolarHavells SolarMicrotek SolarExide Solar,  Waaree SolarVikram SolarLubi Solar etc. [logoshowcase]

Author: Bhanwar Chauhan

Updated On: 24/07/2021