Solar Management Unit - PWM

UTL introducing a brand new and unique solar device name ' Solar Management Unit". SMU (solar management unit) is the India’s special and unique device that converts your simple Inverter into Solar Inverter. SMU ensures priority usage of solar power to reduce grid (government electricity) consumption. The same SMU is work for both 12V & 24V inverter.

The charging process has been optimized for long battery life and improved system performance. The comprehensive self-diagnostics and extensive electronic protection can prevent damage against incorrect wiring or system faults.

If the sunlight is full then solar charge controller charge the solar battery with the first priority of solar energy, when the battery is fully charged, it runs the load from the solar and automatically starts running the load on the power back in the evening. Solar management unit gives first priority to solar panel’s power.

In this SMU, you get the in-built PWM Solar Charge Controller, which keeps the efficiency of solar panels and life of solar battery longer.

The best part of UTL SMU (solar management unit) is that it runs on one inverter with one battery or two batteries. It has best features to automatic battery selection. It is available in 12V or 24V with 1 year warranty.

Special Features

High Speed with high Performance

UTL`s solar management unit (SMU) is embed with a high speed microcontroller which increases the performance of the solar system. Solar management unit provide ability to perform its task more reliably and efficiently.

High Reliability with Longer Operational Life

It is highly reliable and it has longer operational life. Solar management unit can be operated in extreme environment conditions and can be operated at temperature range that lies in 0°C to 60°C.

Prioritize Solar Power over Grid Power

SMU ensures priority usage of solar energy over government electricity (grid) to reduce grid consumption. In daytime condition, the system will give priority to solar energy and use grid power only when the solar power is insufficient to sustain the load requirement.

Increase the battery lifetime

SMU utilizes four stage battery charging algorithm that enhances the battery lifespan. In bulk stage SMU feeds the battery installed to it a constant boost charging current until its voltage reaches 14.4V and the float current, then in absorption stage it maintains this voltage above 14.2V for 3 hrs.

Automatic/ Manual Operation

The system can work as a domestic inverter and a solar inverter automatically or manually through a switch except in night condition. In night condition, first it will harvest the stored battery energy then it will work as normal domestic inverter.

Inbuilt Protection to Avoid Battery Undercharge and Over-charge

SMU has the capability to charge a solar battery which goes in deep discharge condition. It can charge the battery if the battery voltage during discharge reaches up to 8V per battery. Solar management unit uses four stages to charge the battery i.e. Boost, Absorption, Float and Equalization. This feature protects the battery for being over charged.

Very Low Consumption in Idle State

It have very low idle consumption, in idle state it consumes less than 20mA current which makes it more efficient than any other solar management unit.

Electronic protection
  • Over charging Voltage
  • Over charging Current
  • Under voltage
  • Battery reverse polarity protection
  • Solar reverse polarity protection
  • Reverse current flow at night from battery to solar array
  • Over temperature
  • Solar Low Voltage
Display Parameter
  • Battery - Voltage, Current, Type
  • Solar- Voltage, Current
  • Mode Selection
  • Solar Status – High, Low, Overload, Overheat.
  • Saving kWh
  • Mains Present – Low, High, Absent Maximum PV Current
There are some special features that given below.
  • High Speed and High-Performance micro-controller
  • High reliability with longer operational life
  • Inbuilt protection to avoid battery undercharge and over-charge
  • Inbuilt PWM Technology Charge Controller
  • Automatic voltage selection for 12V or 24V
  • Solar Prioritization
  • Compact design with wall mounting
  • Eco friendly

Technical Details of SMU

UTL mentioned more and more unique features in SMU also simple features that can operate anyone. All technical details is given below.

Particulars Description
SMU Capacity SMU1224/40
Operating Temperature 0°C to 50°C
Storage Temperature -20° C to 60°C
Battery Type Tubular/SMF, Battery 12V/24V
Battery Capacity AH 100AH – 180AH
Battery charging regulation method Bulk, Absorption, Float, Equalise
Nominal System Voltage 12/24 DC
Charging Current (Solar) 20A-40A
Charge Controller Efficiency >95%
Idle Consumption <20mA
Operating Solar Input Voltage (VOC) 22.5V/45V
Max. Solar Input Voltage (VOC) 25A/45V
Min. Solar Input Voltage (VOC) 15V/30V ± 2%
Solar Panel Recovery Voltage 17V/31V ± 2%
Max. Solar Current 40A
Efficiency >95%
Battery Set Point @25 °C
Absorption voltage Tubular Battery 14.2V/28.4V±2%
Absorption voltage SMF Battery 13.7V/27.4V±2%
Absorption Duration 3hr
Float Voltage Tubular Battery 14V/28±2%
Float Voltage SMF Battery 13.7V/27.0V±2%
Bulk Voltage Tubular Battery 14.6V/29.2V±2%
Equalise Voltage 14.9/29.8V±2%
Equalise Duration 3hr
Equalise Calendar 28days
Mains reconnect when Solar not Present At any Battery 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%
Fixing Wall Mounted
Weight 1.5Kg
Ingress Protection IP-20
Dimension 228X152X76 mm