EG4 FlexBOSS18 + OutBack Power EnergyCell 5 48V 100Ah

What you'll set up yourself

1. Ask OutBack Power whether this battery can run without communication. Their documents don't say.
2. Enter the battery's charge settings on the inverter by hand, in the battery settings described in the inverter's manual.
   • Max charge current: no more than 100 A per battery, from the battery's spec sheet.
   • Charge voltage, float voltage, and low-voltage cutoff: from the OutBack Power EnergyCell 5 48V 100Ah spec sheet.

Published limits, side by side

Values come from each maker's documents. "Not published" means the maker doesn't state it.

Confirm with the makers before you buy

• Whether one battery can take the inverter's full current. The inverter's max battery current is 208 A. This battery is rated for 100 A charging and 100 A output. Ask how many batteries to run in parallel.
• Which firmware versions support this pairing. We don't track firmware.
• That your cable lugs fit the inverter's battery studs (Not published) and the battery's terminals (Quick Connects).
• How to install both safely, from each maker's manual and your local code.

This result checks two things: the battery's voltage suits the inverter, and the inverter maker lists this battery for closed-loop communication (the battery tells the inverter how to charge it). It doesn't check current limits, charge settings, firmware, cable sizes, or safe installation. Confirm those with both makers before you buy.

Sources

This result comes from the documents below. We haven't yet found an outside source that confirms it, such as a forum report or a video of a real install.

• EG4 FlexBOSS18 spec sheet · manual
• OutBack Power EnergyCell 5 48V 100Ah spec sheet