FlexBoss and GridBoss Monitoring Settings for a Single Inverter + GridBoss Combo

If you have a FlexBoss inverter paired with a GridBoss and batteries, these settings will help you get reliable monitoring, correct behavior during grid events, and safe grid sellback. The steps below assume a single FlexBoss (master inverter), one GridBoss, and any number of batteries. Follow hardware wiring and safety instructions first, then apply the software settings.

Quick setup checklist

Create a unique station name in your monitoring account so your system is easy to identify.
Connect the Wi‑Fi dongle to the FlexBoss (use a 2.4 GHz network).
Confirm all hardware connections — FlexBoss to GridBoss communication cables, battery connections, AC meter wiring, and inverter DIP switch positions. Fix hardware before changing software settings to avoid commissioning errors.
Have manuals and installer contact info handy if you are unsure about wiring or permits.

Basic monitoring and maintenance tab

Once the dongle is online, open the maintenance section of the monitoring portal and press Read to pull current values and make sure the inverter time zone is correct for your location.

Operation mode

Normal — standard grid‑connected operation (recommended for most systems).
Standby — low‑power sleep mode; use only if intentionally needed.
Off‑grid — absolute zero export to the grid when AC is present. This prevents grid assistance for loads and disables AC charging unless AC charge is enabled. Only use this if you want the system to operate as isolated from the grid.

For a typical grid‑tied system with battery backup, leave operation on Normal and keep off‑grid mode disabled unless you have a specific reason to isolate the system.

EPS outputs and power backup

EPS or backup output settings control how the inverter provides power during a grid outage. Enable Power Backup only if you have relocated critical loads to a separate subpanel (a critical loads panel) and installed the system per local permit requirements. This setting allows the inverter to power the backup panel after the grid is lost, without energizing the main grid.

Grid sellback vs fast zero export — safety first

Choosing how the system interacts with the grid is both a regulatory and a safety issue:

Grid Sellback Enabled — the system is allowed to export excess solar to the grid. Only enable this if your utility has issued a Permission to Operate (PTO) or equivalent authorization.
Fast Zero Export — prevents export to the grid (keeps generation to meet loads and battery charging but blocks sending power back). Use this if you do not have PTO or your utility requires zero export.

Never enable grid sellback without authorization. Exporting to the grid during an outage can endanger utility workers and violate regulations.

Battery settings

Correct battery configuration ensures proper charging behavior and accurate monitoring.

Battery type: set to Lithium for lithium ion batteries (EG4 and most modern batteries). For lead acid or other chemistries, change accordingly.
Protocol / COM number: select the correct brand/protocol (for EG4 choose the EG4 protocol option).
Battery Share: enable when batteries are connected to multiple inverters in parallel so charge/discharge and state of charge are managed across the system.

There is a compatibility list for supported batteries and protocols. Use the correct protocol for your battery brand to maintain closed‑loop communication and accurate control.

Advanced settings and commissioning

These settings are important for a one FlexBoss + one GridBoss configuration and should be applied in this order:

Enable GridBoss in the FlexBoss settings before bringing the GridBoss online — this avoids communication errors.
Set system type on the FlexBoss to Master. Additional inverters are set as Slave or configured for three‑phase where applicable.
Firmware updates: update the FlexBoss firmware first, then the GridBoss. Firmware updates fix bugs and improve commissioning stability, especially after long storage or delayed installs.

If updating the GridBoss, you may need to briefly power down or flip the appropriate breakers (follow the installation manual and electrical safety procedures) so the update can complete cleanly.

Communication wiring and DIP switches

Correct comm cable orientation and DIP switch positions determine which inverter acts as master and which are slaves:

Master inverter — set two DIP switches to the up/on position.
All slave inverters and GridBoss units — set the two DIP switches to the down/off position.

This wiring and DIP switch pattern is important when multiple inverters or multiple GridBoss units are used. For a single FlexBoss + GridBoss setup, the FlexBoss is the master and will control sellback, backup, and battery communication once configured.

Final checklist for a one FlexBoss + one GridBoss grid‑tie system

Unique station name and monitoring account configured
Wi‑Fi dongle connected to a 2.4 GHz network
Hardware wiring verified: communication cable, AC meter, battery cabling, and breakers
General operation mode set to Normal
EPS power backup enabled only if critical loads are relocated and permitted
Grid sellback enabled only with utility permission; otherwise use Fast Zero Export
Battery type set to Lithium and correct protocol selected (EG4 if applicable)
Battery Share enabled if batteries connect across multiple inverters
GridBoss enabled in the FlexBoss before bringing GridBoss online
FlexBoss firmware updated first, GridBoss updated second
DIP switches set: master up/up, slaves/grid boss down/down

Need help?

If you are unsure about wiring, permits, or the proper settings for your specific scenario, consult the product manuals or contact your installer or support team. Proper configuration protects utility workers, ensures compliance, and gives you the most reliable backup and export behavior.

Accessing Helpful Resources for Your EG4 6000XP Setup

To further assist you in setting up and maintaining your EG4 6000XP system, we’ve compiled a list of helpful resources:

EG4 FlexBoss21 User Manual – This comprehensive manual provides detailed instructions on the installation, operation, and maintenance of the EG4 Flexboss 21 inverter.
EG4 FlexBoss 18 User Manual – This comprehensive manual provides detailed instructions on the installation, operation, and maintenance of the EG4 Flexboss 18 inverter.
EG4 GridBoss V3.1 User Manual – This comprehensive manual provides detailed instructions on the installation, operation, and maintenance of the EG4 GridBoss 200A MID.
Wi-Fi Dongle Setup Video – If you want to remotely monitor your system’s performance, this video guide will walk you through the process of setting up the Wi-Fi dongle.

Purchasing the Components Featured in This Guide

If you’re ready to set up your own EG4 6000XP battery system, you can find the products featured in this guide on the SanTan Solar website:

Remember, if you need any assistance with choosing the right equipment or troubleshooting your solar setup, the team at SanTan Solar is always here to help. Visit SanTanSolar.com for more information.

Happy solar powering!