Solar Management Unit (SMU)

UTL introducing a brand new and unique solar device name “Solar Management Unit”. The SMU (Solar Management Unit) is a unique device developed in India that converts your standard inverter into a solar inverter. SMU ensures priority usage of solar power to reduce grid (government electricity) consumption. The same SMU works with both 12V & 24V inverters.

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.

When sufficient sunlight is available, the solar charge controller charges the battery using solar energy as the first priority. when the battery is fully charged, it powers the load using solar energy and automatically switches the load to grid power in the evening.The Solar Management Unit gives priority to solar power. In this SMU, you get the in-built PWM Solar Charge Controller, which improves solar panel efficiency and extends battery life..

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

Technical Details of Solar Management Unit (SMU)

UTL has included several unique and user-friendly features in the SMU. All technical details are given below.

Particulars	Description
General
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
Electrical
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%
Physical
Fixing	Wall Mounted
Weight	1.5Kg
Ingress Protection	IP-20
Dimension	228X152X76 mm
Rate
Discounted Price ( Inclusive of all Taxes )	Rs. 5,624.00

Special Features

High Speed with high Performance

UTL’s Solar Management Unit (SMU) is equipped with a high-speed microcontroller which increases the performance of the solar system. The Solar Management Unit provides the ability to perform its task more reliably and efficiently.

High Reliability with Longer Operational Life

It is highly reliable and has longer operational life. Solar management unit can be operated in extreme environment conditions and can be operated within temperature range of 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. During the daytime, 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 battery life

SMU utilizes four stage battery charging algorithm that enhances the battery lifespan. In bulk stage SMU supplies the connected battery with 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 harvests 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 from overcharging.

Very Low Consumption in Idle State

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

Electronic protection

Overcharging Voltage
Overcharging 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

FAQs about Solar Management Unit (SMU)

Q. Is this based on MPPT charge control?

Answer: No, it’s based on PWM (Pulse Width Modulation).

Q. Can I connect 180w two panels and 125w two panels 12v with 12v single solar battery with UTL SMU?

Answer: Yes you can use but there will be a voltage drop because you are using two different watt panels.

Q. My inverter is in 12 volt and solar battery also in 12v, can I connect 24 volt panel to SMU?

Answer: No, it supports only 12V.

Q. Can I connect 330watt *6 panels? It means total 1980 watt?

Answer: You can connect maximum 4 solar panels of 330watt.

Q. Can I connect SMU with Inverter?

Answer: Yes.

Q. Can I connect 180watt 4nos solar panel of voc this panel is 23.26 volt with 12v battery?

Answer: Yes. You can connect 180 watt 4 solar panels with this UTL SMU. We can provide you installation support on call at the time of connection.

Q.How much watts and Amp solar panels will support this controller?

Answer: It can support three solar panels of 330 watt and six solar panel of 160watt, it support 12V and 24V systems.

Q. Can I connect 4nos solar panel with 315w 24v rating?

Answer: It means four 315w panels i.e. 315*4 = 1260 watt at 24v is not possible, the panel can supply nearly 300A while the solar charger is designed for 40A.

Q. I have one 160ah*12v and four 12v*180watt solar panels (voc 23.5v and 9.5a). Please tell me which way I can connect series or parallel?

Answer: Yes, you can connect solar panels in parallel.

Q. Can I use it directly 1hp submersible pump with UTL SMU?

Answer: No, it can’t run without Inverter and battery.

Q. When does it connect the grid connection during the day time? How many amps from solar panel does need in the morning to start it?

Answer: When the panel voltage goes below 25V it goes to grid and amp is not the parameter for starting.

Q. Is UTL a Chinese company?

Answer: No. UTL is a 28 year old Indian company, has three manufacturing units in Himachal Pradesh, Noida, Haryana and head office in Delhi.

Q. May I use 150 watt single solar panel, is it possible?

Answer: Yes, no issue.

Q. Can I use it without inverter for DC load only?

Answer: No.

To receive the UTL dealer’s contact number on your phone, please fill out the form.

Client Details

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SMU Rating	MRP ( Inclusive of all taxes )	Discounted Price
1224/40	Rs. ~~8,720.00~~	Rs. 5,624.00

Solar Management Unit