SigEnergy backup and discharges SoCs

[liambresnahan]

I’m commissioning Predbat with a Sigenergy SigenStor + Gateway and have a question around forced discharge and backup reserve.

My intended setup is:

• Backup SoC: 10%
• Discharge cut-off: 0%
• Predbat minimum SoC: 10%

What I’m trying to confirm is:

1. With Remote EMS in Command Discharging, does Sigenergy still stop at Backup SoC while grid-connected, even if discharge cut-off is 0%?
2. If the grid then fails, does the Gateway allow the battery to continue below Backup SoC down to the discharge cut-off?
3. What happens if the grid fails while Remote EMS is active? Does Sigenergy automatically take over in backup/self-sustaining mode, or can the last Remote EMS settings persist?

This matters especially for Predbat freeze modes, where temporary limits may be applied.

My current plan is to keep a conservative 10% discharge cut-off for initial testing, then test Backup SoC 10% / discharge cut-off 0% under both grid-connected forced discharge and a controlled islanding event.

Has anyone already tested this on SigenStor + Gateway, or seen Sigenergy documentation covering the Remote EMS → islanded transition?