Solis S5-EH1P3K-L – forcing low-power state / exiting “Bypass / Inverting / Running”?

[Alf-Tupper]

I'm trying to understand and possibly manually trigger a low-power state on my Solis S5-EH1P3K-L hybrid inverter.

At night, with no PV and no load, the inverter normally remains in the status:

Bypass / Inverting / Running

In this state, the inverter appears to consume around 80–90 W.

However, when my lead-acid battery bank reaches the configured Over-discharge Voltage, the inverter changes status to:

Normal operation

At the same time, its power consumption drops dramatically to around 9 W.

This behaviour is repeatable and appears to be directly triggered by reaching the configured Over-discharge Voltage. My system uses lead-acid batteries with no communicating BMS, so the trigger is voltage-based rather than SOC-based.

From the Solis Modbus information I've found, register 33095 appears to map these operating states, with status 4 corresponding to “Bypass inverting Running” and status 0 corresponding to “Normal operation”.

What I'm trying to achieve is to force the inverter into the same ~9 W low-power state overnight while the battery is still around 51–52 V, rather than having to discharge the battery all the way to the Over-discharge Voltage first.

I have already tried temporarily increasing the Over-discharge Voltage via Modbus. The inverter accepts values up to roughly 47–48 V, but higher values such as 49–52 V are rejected/reset to 44.5 V, so using the voltage threshold as a workaround isn't viable.

Has anyone successfully:

• Forced a Solis S5/RHI hybrid out of “Bypass / Inverting / Running” and into the lower-power “Normal operation” state?
• Triggered the same low-power behaviour via Modbus, an undocumented register, installer setting, or operating-mode change?
• Found a way to invoke the inverter's ECO/sleep/low-power logic without reaching the battery Over-discharge Voltage?

I'm specifically interested in actual tested workarounds or register-level findings rather than general Self-Use or Time-of-Use settings.

Any register captures or comparisons between status 4 and status 0 would also be very useful.