How to Build a Partial Home Backup System with BLUETTI EP500Pro

User Manual

Thank you for making BLUETTI a part of your family. BLUETTI is committed to sustainable green energy storage solutions for both indoor and outdoor use, delivering an eco-friendly experience.

1. 120 Volts EP500Pro Backup System

Declaration:

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.

The EP500Pro's Machine Type is set to "Single Phase" by default. DO NOT change this setting if you are operating a single EP500Pro.

To build the backup system, you need the following:

Accessories	Qty.
Transfer switch: Reliance 310A Pro/Tran 2	1
30A AC Charging cable	1
NEMA L14-30 extension cord	1

Note: Please read the Reliance 310A Pro/Tran2 manual before installation. [Link to Reliance Controls Manual: https://www.reliancecontrols.com/Documents/PT2%20Loadside%20Installation%20and%20Operating%20Instructions.pdf]

Wiring Diagram Description (120V System)

This diagram illustrates the connection of the EP500Pro backup system. It shows the main electrical panel receiving 240V utility power. From the main panel, power is routed through a transfer switch (Reliance Pro/TRAN-2). The transfer switch directs power to either a "Normal Load" or an "Essential Load". The EP500Pro unit is connected to the system via a NEMA L14-30 socket/inlet and AC charging cables. The diagram details the wiring paths for Live (L1), Neutral (N), and Ground (PE) connections between the utility, main panel, transfer switch, and the loads.

2. 240 Volts EP500Pro Backup System

You can build the 240V Split Phase System by pairing two EP500Pro units together. The system also has double the available output power and capacity.

Besides Two EP500Pro units, you also need the following:

Accessories	Qty.
Transfer switch: Reliance 310A Pro/Tran 2	1
EP500 Pro split-phase output cable (from BLUETTI)	1
NEMA L14-30R outlet	1
BLUETTI 30A AC charging cable	1
Communication cable for split-phase function	1

Note: Please read the Reliance 310A Pro/Tran 2 manual before installation. [Link to Reliance Controls Manual: https://www.reliancecontrols.com/Documents/PT2%20Loadside%20Installation%20and%20Operating%20Instructions.pdf]

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, that's to say, do not connect high-wattage appliances centrally to a single EP500Pro.

Wiring Diagram Description (240V Split-Phase System)

This diagram illustrates the 240V split-phase backup system. It shows two EP500Pro units connected to a main panel via NEMA L14-30 outlets/inlets and split-phase AC charging cables. The main panel is connected to 240V utility power. A Reliance Pro/TRAN-2 transfer switch receives power from the main panel and distributes it to a "Normal Load" and an "Essential Load". The diagram details the wiring for L1, L2, Neutral (N), and Ground (PE) connections for both EP500Pro units and the transfer switch.

Configuring the EP500Pro Units for Split-Phase

Caution: The backup split phase system must be properly installed by a licensed electrician.

How to configure the EP500Pro units:

Turn off both of the EP500Pro units.
Connect the EP500Pro units to transfer switch via the EP500Pro split-phase output cable. One L14-30 plug goes to a unit.
Connect the two EP500Pro units via the communication cable.
Turn on either EP500Pro unit.
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 EP500Pro. 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 and wait a moment.

Video Guide: Please watch the video from: [https://www.youtube.com/watch?v=aDLxv5oM5kg]

Important Notes:

Disconnect the AC charging cables from EP500Pro units before connecting to the transfer switch.
The split phase system can be controlled ONLY on the “Master” set.
If one of the EP500Pro units is out of power, the split phase system fails automatically.
The backup system must be properly installed by a licensed electrician.
Please check the voltage at outlets before plugging in your household appliances.
It is a electrical schematic. For the actual wiring diagram, please refer to Reliance 310A PRO/TRAN2 installation instructions.
In the main panel, two Neutral/Ground bus bars have been connected together with copper strips.

Connecting EP500Pro Units to the Main Panel

Charge the 240V split phase system with EP500Pro 30A split phase AC charging cable. Plug the cable to a NEMA L14-30 socket (240V) and the other two connectors into the AC input ports of the EP500Pro units. The AC input ports should be connected to L1/N/PE and L2/N/PE, respectively. The current capacity of AC input plug shall be ≥ 30A.

Diagram Description: This shows the connection of the 30A split-phase AC charging cable to a NEMA L14-30 socket and then to the EP500Pro units' AC input ports (L1 N PE and L2 N PE).

Wrong Connection Warning

Warning: DO NOT charge EP500 Pro with standard AC charging cable in the split phase system, as this may cause damage to the batteries inside and invalidate your warranty.

Key: L: Live wire, N: Neutral wire

Diagram Description: Diagrams illustrate incorrect connections using standard AC charging cables, showing the wrong wiring paths for live, neutral, and ground wires.

Charging Capabilities

The split phase system supports charging via solar panels. You can charge it by PV and the EP500Pro 30A split-phase AC charging cable simultaneously. (AC input only through the EP500Pro 30A split-phase AC charging cable but not the standard AC charging cable).

Diagram Description: This diagram is similar to the 240V split-phase wiring diagram but includes an input labeled "Solar Power" alongside "240V Utility Power", indicating simultaneous charging is possible.

3. Accessories

3.1 Transfer Switch

Recommendation: Reliance Controls 310A PRO/TRAN 2 transfer switch.

3.2 BLUETTI 30A AC Charging Cable

Please buy it from BLUETTI official store: [https://www.bluettipower.com/products/ac300-30a-ac-charging-cable?variant=42518515876059]

3.3 BLUETTI EP500Pro Split-Phase Output Cable

Purchase from BLUETTI: [https://www.bluettipower.com]

Diagram Description: Shows the split-phase output cable with NEMA L14-30 and NEMA L14-30R connectors.

3.4 BLUETTI EP500Pro 30A Split-Phase AC Charging Cable

Please buy it from BLUETTI official store: [https://www.bluettipower.com/products/30a-ac-charging-cable-for-split-phase-function]

3.5 Communication Cable for Split-Phase Function

Please buy it from BLUETTI official store: [https://www.bluettipower.com/products/communication-cable-for-split-phase-function]

3.6 NEMA L14-30R Socket

For charging the 240V EP500Pro split phase system. Recommendation: Journeyman-Pro HJP 2710 NEMA L14-30R socket.

3.7 NEMA L14-30 Extension Cord

If you want to get 10 FT NEMA L14 extension cord, the referenced purchase address as following.

3.8 Circuit Breaker & Protection Box

If you have a residential solar array with a voltage of 12V-150V, you're strongly recommended to use a DC circuit breaker panel to enable or disable solar charging. NOTE: If there are two solar panel arrays with a total open circuit voltage of 12-150V, you also need two 2P 16A DC circuit breakers.

4. How to Install Reliance Controls

Please refer to Reliance Controls website: [www.reliancecontrols.com]

4.1 How to install Reliance Controls ProTran2 - Part1, Tools and Planning

[YouTube Video: https://www.youtube.com/watch?v=xTqjwt6WJ7o&list=PLpYCE0n7d22iDNwpVnOF9HULSUYBBRY86]

4.2 How to install Reliance Controls ProTran2 - Part2, Mounting

[YouTube Video: https://www.youtube.com/watch?v=wNbBHVHgwOY&list=PLpYCE0n7d22iDNwpVnOF9HULSUYBBRY86&index=2]

4.3 How to install Reliance Controls ProTran2 - Part3, Wiring

[YouTube Video: https://www.youtube.com/watch?v=TKruj9BpZM8&list=PLpYCE0n7d22iDNwpVnOF9HULSUYBBRY86&index=3]

4.4 How to install Reliance Controls ProTran2 - Part4, Replacing Circuit Breakers

[YouTube Video: https://www.youtube.com/watch?v=IkOuauT-YP8&list=PLpYCE0n7d22iDNwpVnOF9HULSUYBBRY86&index=4]

4.5 How to install Reliance Controls ProTran2 - Part5, Installing The Power Inlet Box

[YouTube Video: https://www.youtube.com/watch?v=0M8sYRhEVPY&list=PLpYCE0n7d22iDNwpVnOF9HULSUYBBRY86&index=5]

4.6 How to install dd Controls ProTran2 - Part6, How To Operate

[YouTube Video: https://www.youtube.com/watch?v=O4GA9AK8Tmo&list=PLpYCE0n7d22iDNwpVnOF9HULSUYBBRY86&index=6]

5. More Information

Website: [www.bluettipower.com]

Email: [service@bluettipower.com]

	How to Build a Partial Home Backup System with BLUETTI EP500Pro A comprehensive user manual detailing the process of building a partial home backup system using the BLUETTI EP500Pro. It covers setup for both 120V and 240V systems, lists necessary accessories, and provides step-by-step installation guidance, including wiring diagrams and configuration instructions.
	BLUETTI EP500Pro User Manual: Building a Home Backup Power System Comprehensive user manual for the BLUETTI EP500Pro, detailing how to set up a partial home backup power system. Includes installation guides, accessories, and configuration steps for single-phase and split-phase setups.
	BLUETTI AC500+B300S User Manual: Building a Partial Home Backup System Comprehensive user manual for setting up a partial home backup power system using BLUETTI AC500 and B300S battery packs. Covers 120V and 240V configurations, accessories, and installation guidance.
	BLUETTI AC500+B300S User Manual: Building a Home Backup Power System Comprehensive user manual for setting up a BLUETTI AC500 and B300S home backup power system. Learn about 120V and 240V configurations, accessories, and installation procedures.
	How to Build a Partial Home Backup System with BLUETTI AC300+B300 A comprehensive user manual detailing the setup and installation of a partial home backup power system using BLUETTI AC300 and B300 units. This guide covers both 120V and 240V configurations, including necessary accessories, wiring diagrams, and step-by-step instructions for a safe and efficient installation.
	BLUETTI AC300+B300 User Manual: How to Build a Partial Home Backup System Comprehensive user manual for the BLUETTI AC300+B300 system, guiding users on building a partial home backup power solution. Covers 120V and 240V configurations, accessories, installation, and setup for reliable home energy backup.
	BLUETTI EP500 Pro: Connecting to US Utility Power (120V & 240V) A comprehensive guide on connecting the BLUETTI EP500 Pro portable power station to US utility power for 120V single-phase and 240V split-phase configurations. This guide covers essential accessories, wiring diagrams, and setup steps.
	BLUETTI EP500 Power Station User Manual - Reliable Home Energy Storage Explore the BLUETTI EP500 Power Station user manual. Learn about its features, installation, operation, safety, and troubleshooting for a portable, plug-and-play home energy storage and backup power solution.