🏷️ Are export_power_limit and grid_charge_current stored in EEPROM or RAM?

[user239018]

Hi @kellerza 👋

I'm working on a dynamic control system using a Deye/Sunsynk inverter (SUN-50K-SG01HP3-EU-BM4). For grid services (balancing energy), I need to frequently write to the following registers:

• export_power_limit (Register 1405)
• grid_charge_current (Register 754)

Can you confirm if these values are stored in volatile memory (RAM) or if they are written to non-volatile memory (EEPROM/Flash)?

We need to update them every 5–10 seconds, and frequent EEPROM writes could wear out the memory. If these are RAM-based, we plan to purchase 10 inverters for deployment.

Also, since our use case requires both positive and negative balancing power, we cannot rely on CT/meter-based regulation – we need direct and precise external control over battery charging and export limits.

Any insights or documentation references would be highly appreciated!

Thanks a lot 🙏

[kellerza]

Ideally you should ask Sunsynk.

These settings are persistent, so it won’t be RAM.
In the past I have asked about changing setting a couple of times a day, they had no concern.

I doubt the design intention was that this is a real-time control channel

[user239018]

Hi @kellerza, thanks so much for the quick reply!

Yes, that makes sense — and your confirmation that these registers are persistent is very helpful.
You're absolutely right: these were likely never intended as a real-time control channel.

Our use case is a bit unusual: we're participating in a project to provide balancing (regulation) energy, which requires us to adjust power targets every few seconds dynamically — both positive and negative. So unfortunately, the CT/meter-based feedback loop isn’t an option for us, since we need precise external control over both export and battery charging.

I’ll reach out to Sunsynk or Deye directly to see if there’s a RAM-based or temporary control register for this use case.
If any such registers exist or if you happen to come across alternative approaches, I’d love to hear about them!

Thanks again for your amazing work on this integration — it’s really enabling next-level energy control setups. 🙏

Best regards,
Christian