Sunpack Solar Home PCU
Sunpack Solar Home PCU
Sunpack Solar Home PCU

Home PCU

Sunpack Solar Home PCU

Solar Home PCU (Sunpack) is a solar hybrid inverter which utilizes both the Solar Power and Grid Power to charge the batteries with giving priority to solar power. Solar power is of the first priority while charging. This means that when Solar power is available, the batteries will be charged with it only, irrespective of whether Grid power is available or not. It is designed to give you the maximum advantages from the Sun and thereby reduces your Electricity costs.

Sunpack is very easy to install. It fits your budget and also helps to cut your electricity costs. So, it is double advantage to the user!! Unlike other sources of energy, Home PCU and the Solar Panel do not emit harmful gases and residue in the environment. Thus, it helps in keeping the environment clean and healthy.

Rating Aavailable in 800VA to 3000VA


Sr.No. Problems Indication Possible Cause & Their Solution
1. System not switch on No Indication 1. Check battery terminals & wire.
2. Check the DC fuse at the rear panel of the system.
3. 9 pin display connector may be loose.
4. System On/Off switch (micro switch) may be faulty.
2. No output on iverter mode, sensing low battery. Battery On then Low battery. 1. Check battery voltage on load for a few minutes, it must be
10V per battery all the time.
2. Battery connection at battery terminals should be tight. Check if there is Carbon/sulphation on battery terminals.
 3. No buzzer in Battery low, overload & mains fail condition Bat. On and bat. low or overload Inv mode/ups mode. 1. Transistor Q10 or buzzer may be faulty
 4.  System not Sensing Mains Bat. On in mode/ups mode, No indication of mains  1. Check AC fuse/MCB. It may be blown off or it is not properly tight in the fuse holders before this it should be checked that mains voltage is present at input Mains lead.
2. Mains in UPS mode could be lower than 170V AC. 
 5. Sysem not Charging battery  Mains on Inv mode/ups mode.  1. Charging preset may be faulty.
2. Battery may be faulty.
3. R-79 Resistance value may be shifted.
4. Micro-controller or U9 (4N35) may be faulty, check the Microcontroller Pin N0-1 (2.5V).
5. Check -3V at Pin No -4 OP07.
 6.  AC I/P fuse Blowing repeatedly Mains on Inv. Mode/ups mode.  1. Inverter may have excessive load on it. Remove the extra load. Because in Mains time, current passes through this fuse.
2. Any of the relays could be stuck.
3. Charging current is Uncontrolled. 
 7. Very Low back Up time.  Inv. ON & then Low battery.  1. Duration of Mains supply may not be enough to charge the Battery / Batteries.
2. Battery Terminals may have corrosion on them. Clean with hot water. Shred the end of the wire connected to battery, strip it and re-connect it to the battery terminals. (If there is corrosion on the wires.) After re-connecting apply Vaseline or white Petroleum jelly on the Terminals. Also check battery water level.
3. One or more cells of the battery could be defective.
4. Battery may be dry. 

Faults related to solar charging

Sr.No. Problems Indication Possible Cause & Their Solution
1. Battery is charging through solar. No SPV indication 1. Check ZD7 and F2 fuse. Then check path (including components) from solar panel terminals to SPV LED
2. Battery is not charging when solar power is available SPV indication 1. Battery may be fully charged.
2. Solar Panel voltage is less than charging voltage (15V).
3. MOSFET (MF27) may be faulty or its gate resistor may be open.
3. Battery is charging through solar even when battery is fully charged SPV indication 1. Check Opto-coupler (U10), R91.
2. Micro-controller may be faulty
4. No output Battery low LED blinks 1. Battery has gone in battery high-cut protection. Press the micro-switch to switch ON the system.
1. Connect batteries to the UPS

    • Check the polarity of batteries.
    • Connect the red wire to the positive terminal and the black wire with the negative terminal of the battery.

2. Change the AC fuse

    • At the back of the UPS remove fuse holder cap by rotating it, take the damaged fuse out.
    • Replace the damaged fuse with a new one of the same rating. Extra fuses are provided in the fuse box.
    • Put the fuse holder cap as it was before.

3. Change the DC fuse 

    • At the back of the UPS take the damaged fuse out by pulling it.
    • Replace the damaged fuse with a new one of the same rating. Extra fuses are provided in the fuse box.
    • Put the fuse back as it was before.

4. Connect Mains

    • To connect Mains with the system a 3 Pin Indian lead is provided.
    • Insert the plug of the system in to the socket outlet of the distribution board.

5. Connect Load

    • To connect load to the system, socket is provided at the backside of the system.
    • Use BS 546 (6A, 3 pin plug) receptacle to connect the load to the system.
    • Connect the earth wire of the load to the top terminal of the plug.
    • Connect the neutral wire of the load to the (N) terminal of the plug.
    • Connect the phase wire of the load to the (L) terminal of the plug.
    • Connect the plug to the output socket of the UPS.

6. Connect Solar Panel to the system

    • While connecting solar panel to the system, total solar array voltage must be less than maximum solar panel
      open circuit voltage of the system.
    • Positive terminal (+ve) of solar array must be connected to the positive terminal (+ve) of the SPV terminal block
      and negative terminal (-ve) of solar array must be connected to the negative terminal (-ve) of SPV terminal
    • After verifying connections and checking voltage by multimeter switch ON the MCB.

7. Switch between Narrow Range and Wide Range

    • Turn on UTL Home PCU with the power button given in front of the system.
    • When ON, keep the power button pressed until you hear a beep and the narrow range LED will glow.
    • Repeat the same for switching from narrow range to wide range again.