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
|0°C to 50°C
|-20°C to 60°C
|Tubular/SMF Battery (12V/24V)
|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
|Charging Current (Solar)
|Charge Controller Efficiency
|Operating Solar Input Voltage (Voc)
|Maximum Solar Input Voltage (Voc) ±2V
|Minimum Solar Input Voltage (Voc) @ start-up
|15V/30V ± 2%
|Solar Panel Recovery Voltage
|Max. Solar Current
|Absorption Voltage Tubular Battery
|14.2V/28.4V ± 2%
|Absorption Voltage SMF Battery
|13.7V/27.4V ± 2%
|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%
|14.9V/29.0V ± 2%
|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%
|Batt. Voltage, Batt. Current, Batt. Type
Solar Voltage, Solar Current
Solar status: Low, High, Absent
Max. PV Current
|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
|9-Inch x 6-Inch x 3-Inch
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.
UTL SMU – FAQs
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.
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Author: Bhanwar Chauhan
Updated On: 24/07/2021