How to Build a Partial Home Backup System with BLUETTI AC500+B300S
User Manual V2.0
Thank you for making BLUETTI a part of your family. From the very beginning, BLUETTI has strived to stay true to a sustainable future through green energy storage solutions for both indoor and outdoor use, delivering an exceptional eco-friendly experience for our homes and our world. That's why BLUETTI has a presence in 70+ countries and is trusted by millions of customers across the globe.
1. 120 Volts AC500+B300S Backup System
The AC500+B300S Machine Type is set to "Single Phase" by default. Do not change this setting if you are operating a single AC500+B300S set.
Required Accessories for 120V System
| Accessories | Qty. |
|---|---|
| Transfer switch: Reliance TRK0505BR | 1 |
| NEMA 14-50P to SS2-50R cord | 1 |
| AC charging cable | 1 |
Diagram: 120V Single-Phase Backup System Installation
This diagram illustrates the connection of the AC500+B300S backup system to a main panel and sub panel. It shows the 'Main Panel' and 'Sub Panel' with circuit breakers, connected to 'Normal Load' and 'Essential Load'. The AC500+B300S units are connected via an 'AC500 Input Cable' and 'AC500 Output Cable' to a 'NEMA 14-50 Outlet' and 'NEMA SS2-50 Power Inlet Box' respectively. The diagram labels the components: 1. NEMA 14-50 Outlet, 2. NEMA SS2-50 Power Inlet Box, 3. AC500 Input Cable, 4. AC500 Output Cable.
2. 240 Volts AC500+B300S Backup System
You can build the 240V Split Phase System by pairing two sets of AC500+B300S together. The system also has double the available output power and capacity. Besides TWO sets of AC500+B300S, you also need the following:
Required Accessories for 240V System
| Accessories | Qty. |
|---|---|
| Transfer switch: Reliance TRK0505BR | 1 |
| AC500 split-phase output cable | 1 |
| NEMA 14-50 socket | 1 |
| AC500 split phase AC charging cable | 1 |
Before installing the Reliance Controls transfer switch system, please make an emergency energy plan that includes which appliances you need during a power outage. It is highly recommended to "balance the load" between the two phases of the transfer switch, meaning do not connect high-wattage appliances centrally to a single AC500+B300S set.
Diagram: 240V Split Phase Backup System
This diagram shows two AC500+B300S units configured for a split-phase backup system. They are connected to a 'Main Panel' and a 'Sub Panel' which in turn supply power to 'Normal Load' and 'Essential Load'. The diagram illustrates the 'Split Phase Backup System' setup, indicating connections via NEMA 14-50 and SS2-50 ports.
Configuration Steps for Split Phase System
- Turn off both AC500+B300S sets.
- Connect AC500+B300S sets to the transfer switch via the AC500 split-phase output cable. One NEMA 14-50 plug goes to a set.
- Connect two AC500 units via the communication cable.
- Turn on either AC500+B300S set.
- Go to “Settings” and tap “Next”.
- Tap "Single Phase", the machine type option pops up and select "Split phase".
- Select the “Master” in the Machine Address pop up.
- Turn on the other AC500+B300S set. Repeat step 5 and 6 to set its machine type to "Split phase".
- Select the “Slave” in the Machine Address pop up.
If the connection fails, clear the alarm history, wait for a moment, or try again.
Please watch the video for guidance: YouTube Video Link
Connecting AC500+B300S Sets to the Main Panel
Charge the 240V split phase system with the AC500 split-phase AC charging cable. Plug the cable to a NEMA 14-50 socket (240V) and the other two connectors into the AC500s' AC input ports. The AC input ports should be connected to L1/N/PE and L2/N/PE, respectively. The current capacity of the AC input plug shall be ≥ 50A.
The diagram shows the AC500 split-phase AC charging cable with its connectors labeled for L1, N, PE and L2, N, PE, illustrating the correct wiring for the AC500 units.
WRONG CONNECTION Warning: DO NOT charge AC500+B300S with a standard AC charging cable in the split phase system, as this may cause damage to the batteries inside B300s and invalidate your warranty.
System Diagram with Solar Charging Capability
This diagram shows the 240V utility power connection to the Main Panel and Sub Panel, supplying 'Normal Load' and 'Backup Load'. It reiterates the split-phase setup with NEMA 14-50 Socket and SS2-50 Inlet. A note indicates that the split phase system supports charging via solar panels simultaneously with the AC500 split-phase AC charging cable. (AC input only through the AC500 split-phase AC charging cable but not the standard AC charging cable).
3. Accessories
3.1 Transfer switch
Recommendation: Reliance Controls TRK0505BR transfer switch.
Link: BLUETTI Accessories
3.2 50A AC Charging Cable
Link: BLUETTI Accessories
Image shows a 50A AC Charging Cable with a standard plug and two connectors.
3.3 BLUETTI AC500 split-phase output cable
Link: BLUETTI Accessories
Diagram shows a split-phase output cable with NEMA 14-50P connectors on one end and an SS2-50R connector on the other.
3.4 BLUETTI AC500 split-phase AC charging cable
Link: BLUETTI Accessories
Image shows a 50A AC Charging Cable with a standard plug and two connectors.
3.5 Communication cable for split-phase function
Please buy it from BLUETTI official store.
Link: BLUETTI Communication Cable
Image shows a communication cable with blue circular connectors.
3.6 NEMA 14-50R socket
For charging the 240V AC500+B300S split phase system.
Link: BLUETTI Accessories
Image shows a NEMA 14-50R socket installed in a weather-resistant outdoor box.
3.7 NEMA 14-50P to SS2-50R extension cord
For connecting AC500+B300S to the sub panel.
Link: BLUETTI Accessories
Diagram shows an extension cord with a NEMA 14-50P plug on one end and an SS2-50R connector on the other.
4. How to Install Reliance Controls
Please refer to Reliance Controls website: www.reliancecontrols.com
5. More Information
Website: www.bluettipower.com
Email: service@bluettipower.com
Declaration and Safety Information
- The installation should be performed by a licensed electrician. Improper installation may result in death or serious injury and property damage.
- This document is provided for reference purpose ONLY and does not constitute legal advice. Please consult the local licensed electrician for details.
- BLUETTI shall not be liable for any damage or injury caused by improper installation of the backup system.
- Please check the voltage at outlets before plugging in your household appliances.
- It is an electrical schematic. For the actual wiring diagram, please refer to Reliance PRO/TRAN2 installation instructions.
- In the main panel, two Neutral/Ground bus bars have been connected together with copper strips.
