Field Impact Notice – 314Ah WallMount Charge Rate Suppression

Field Impact Notice – 314Ah WallMount Charge Rate Suppression

Summary
The firmware shipped on the initial batch of EG4 314Ah Indoor WallMount batteries (FW Version Z03T13) features a bug in which the charge rate of the battery is reduced to 15A (~750W) at temperatures above 65 °F.

Customer Impact
Batteries with FW Version Z03T13 active will experience a significant reduction in allowable charge rate, impacting the system’s ability to reliably recharge the batteries in a reasonable amount of time independent of the power availability on site. Depending on the system configuration, excess solar will be sold to the utility or curtailed to zero.

Resolution
A new firmware (FW Version Z03T17) has been made available which resolves this issue and allows the full charge rate of the battery in line with the temperature ranges indicated on the specification sheet for the battery.

This new firmware can be found on EG4Electronics.com under the 314Ah Indoor WallMount product page: EG4 WallMount 314Ah Indoor Battery - EG4 Electronics.

314Ah WallMounts deployed with an EG4 hybrid inverter (kPV or FlexBOSS) and with an internet connection can be updated over-the-air (OTA) by your installer. Batteries deployed with an off-grid (XP) inverter or without an internet connection will require an RS485 adapter (EG4 USB Read/Write Cable - Signature Solar) and a Windows computer. The write up on how to update using an RS485 adapter can be found in the .zip file containing the most up to date firmware.

Please call EG4 Support at 903-609-1988 for additional support with your system.