Auto UPS Wiring for Partial Load – The Rest Load Depends on Main Power
Automatic UPS Wiring for Partial Load – Remaining Load Supplied by Main Power
Suppose you have two light bulbs, one ceiling fan, and a 2 or 3-pin socket in the first room, and one light bulb, two ceiling fans, and a 3-pin 2-gang socket outlet in another room. In a second scenario, you may have all the above-mentioned electrical appliances either in a single room or distributed across different rooms, as shown in Figure 1.
Now, the electrical wiring needs to be arranged in such a way that two light bulbs, one ceiling fan, and a 2-pin socket are powered by the UPS/Inverter (using backup power stored in the batteries) without interruption during a power failure.
The remaining load will continue to rely on the main utility supply or an alternate source such as a generator or wind power. This arrangement is especially useful in cases where uninterrupted power is required for critical equipment such as a personal computer or project work.
In the following UPS/Inverter wiring diagram, it is clearly shown that when the utility power is unavailable, the connected ceiling fan, two light bulbs, and a 2-pin socket operate through the batteries and UPS. This is because the UPS output Live (Phase) wire is connected only to these appliances, while the rest remain off during a power outage.
When the main utility power is restored, all appliances and devices in the wiring system (such as refrigerator, TV, computer, fans, lights, washing machine, etc.) resume normal operation as they are supplied directly by the main source. At the same time, the inverter also recharges the batteries from the utility supply.
Keep in mind that in this wiring method, only the Live (Phase) output from the UPS is connected to the selected appliances that require continuous power, since the Neutral wire is already common and connected to all sockets and appliances in the system.
However, you may also connect both Line (Live) and Neutral from the UPS to the backup appliances if required, as discussed in our earlier UPS/Inverter wiring diagrams.
- Related Wiring Tutorial: How to Connect Automatic UPS / Inverter to the Home Supply System?
Click image or open in a new tab to enlarge
- Related Posts: Automatic UPS / Inverter Wiring Diagram using One Live Wire
Wiring Color Code:
We have used Red for Live or Phase , Black for Neutral and Green for Earth Wire in single phase. You may use the specific area codes i.e. IEC – International Electrotechnical Commission (UK, EU etc) or NEC (National Electrical Code [US & Canada] where;
NEC:
Single Phase 120V AC:
Black = Phase or Line, White = Neutral and Green/Yellow = EGC Grounding conductor
IEC:
Single Phase 230V AC:
Brown = Phase or Line, Blue = Neutral and Green = Earth Conductor.
- Related Wiring Tutorial: UPS / Inverter Wiring Diagram With Auto & Manual Changeover Switch System.
General Precautions
You can find more step-by-step tutorials about UPS/Inverter wiring diagrams and connections, along with detailed descriptions and operating instructions. If you are still experiencing difficulties, feel free to leave a comment in the box below.
Resources and Related Electrical Wiring Installation Tutorials.
- How to Connect a Portable Generator to the Home Supply – 4 Methods
- How Many Panels, Batteries, Charge Controller and Inverter Do I Need?
- How to Wire Solar Panels in Series, Parallel and Series-Parallel?
- How to Wire Batteries in Series, Parallel and Series-Parallel?
- How to Wire Wire a Single-Phase Distribution Board [Consumer Unit]?
- How to Wire a Distribution Board with RCD – Single Phase ?
- How to Wire 120V & 240V Main Panel? Breaker Box Installation
- Single Phase & Three Phase Wiring Diagrams (1-Phase & 3-Phase Wiring)
- Home Electrical Wiring Installation Diagrams & Tutorials
- Single Phase Electrical Wiring Installation in Home – NEC & IEC
- Three Phase Electrical Wiring Installation in Home – NEC & IEC
- How To Wire a Single Phase Energy meter?
- How To Wire a 3 Phase kWh meter?
- How to Control One Lamp From Three Different Places?
- Staircase Wiring Diagram – How to Control a Lamp from Two Places?
- Difference Between Inverter & UPS (Uninterruptible Power Supply)
- Difference Between Voltage Stabilizer and Voltage Regulator (AVR)
- How to Determine the Suitable Size of Inverter for Home Appliances?
- How to Wire Solar Panel to 120-230V AC Load and Inverter?
Its not my first time to pay a visit this website,i am browsing this web page dailly and obtain nice information from here everyday.
Hi Boss, I need some wiring diagrams of multiple ups with 5kva to 10kva transformers to backup my office complex only essential items will stay on ups…Need a bit explanation too please..
Your respond would be ready appreciated
Hi Boss ! i need some solution for my house circuitry . I have to cover 2 floors both having 2 different main supply and both are of single phase .i have 1 950 kv UPS which i want to use for both floors . now issue is as both have different main, when i connect the ups with ground floor and main switch off main. 1st floor get double phase/voltage . as first floor is already getting main from other phase and also getting supply from the ups too. can you suggest me how can i rectify this , should i have to use RELAY for the 1st floor before connecting the ups phase to 1st floor phase.kindly suggest some measure ..i am bit of confused …waiting for your suggestion and help
sir, can I connect both solar and electric power supply in automatic ups system. plz show with diagram
Hello sir, I want to fix inverter in my house I have 10Amps breaker which cover fane , 25Amps which cover Air condiction and 10Amps which cover socket . Now can I join fane and socket and light together? In one breaker and if so which Amps?
Please help me
sir, can I connect 700Watts / 1.0kVA apc ups to 24 volt 150 ah battery