Help Needed: Powland SMG-III Inverter Input Voltage Issue and Possible Firmware Update

[rgabor]

Hello everyone,

I’m experiencing an issue with my Powland SMG-III inverter, and I’m hoping someone here can help.

The Problem:​

The AC icon on the inverter starts flashing intermittently, and when it does, I cannot manually or automatically switch the mode to SUB. This prevents the scheduler function from switching to Utility mode during the night to recharge the battery.

Observations:​

• The issue seems directly related to the input voltage.
• When the grid voltage reaches or exceeds 240V, the AC icon starts flashing. Once the voltage drops below 240V, the problem resolves itself.
• I noticed that adding a load to the grid temporarily drops the voltage to acceptable levels, and the inverter functions normally again.

Context:​

• I understand that EU power regulations allow voltage levels up to 253V, so the grid voltage is technically within the allowed range.
• Unfortunately, the inverter has no settings to adjust the input voltage range, so I can't configure it to handle higher voltages.

Questions:​

1. Firmware Update: Does anyone know if there’s a firmware update available that might expand the acceptable input voltage range or address this issue?
2. DIY Firmware Mod: Has anyone successfully edited the firmware of this inverter or a similar model to increase the input voltage limit? If so, I’d appreciate guidance or resources to explore this option.
3. Alternative Solutions: Apart from adding load or using a voltage stabilizer, are there any other practical solutions for handling this issue?

Additional Details:​

• The issue occurs most frequently when the grid voltage approaches 240–253V.
• I don’t have any other known issues with the inverter.

I’d be grateful for any advice, insights, or resources you can share. Thanks in advance for your help!