Deye inverter 12KW SUN-12K-SG04LP3-EU do not allow batteries to be discharged below 44V.

[kolek]

I should probably disconnect my Deyes from internet

Yes, you should

need remote controlling on them so I just hope Deye won't update them automatically.

Your choice obviously, but given Deye's track record, this is risky. I'd give up the convenience of remote control for stability any day of the week.

 

[shadowmaker]

Yes, you should


Your choice obviously, but given Deye's track record, this is risky. I'd give up the convenience of remote control for stability any day of the week.

Well, I don't like what they did bricking units in countries where Deye shouldn't be. I guess they had to, but still a duck move. Here in Europe that's not a problem. Also never had any problem contacting Deye but maybe that has changed. Two years ago they always answered my questions within 24 hours. Haven't needed to ask anything since then.

I hate computers and they seem to hate me back so I'm stuck with internet connection until I either learn to do it myself (not going to happen) or my nerd friend has time to work on my system. I understand the risks however.

 

[pimpackukas]

My inverter arrived from the factory in April 2024 with firmware MAIN: 2006-1140-1807 and HMI: 1001-C03E. Later, Deye updated the firmware to MAIN: 2006-1144-1807 and HMI: 1001-C037 without my knowledge. Both versions exhibited the same issue: a prolonged startup time of up to 20 minutes.

I contacted the German office for a solution, and they upgraded the inverter firmware to MAIN: 2006-1150-1807 and HMI: 1001-C042. Subsequently, they downgraded it to MAIN: 2006-1148-1150 and HMI: 1001-C042 without informing me. It's possible that the '1150-1807' version is intended specifically for Austria.

Currently, I lack voltage settings for the battery. Instead, settings are displayed as percentages in both deyecloud.com and the Deye Cloud Android app. These settings are as follows:

• Batt Low %: 35
• Batt Shutdown %: 15
• Batt Restart %: 50

Perhaps you could request Support to downgrade your inverter firmware?

 

[cyberdoro]

Hello Rossen-Javor, were you able to solve the problem?
I have the same problem with the Deye SUN-8k.

I've had a Deye SUN 8K, built in 2024, for a week now, with two 1p12S CATL batteries with a nominal voltage of 44V and a recommended voltage range of 38.4V-49.8V.
The connection is established via BMS/CAN bus (Pylon 00), and data is read/processed by the Deye.
Everything works perfectly until the battery reaches 44V, then the discharge drops to zero and stays there until the sun comes out.

I have a friend who has the same system. Only he has a Deye SUN 12K, built in 2023, which can discharge the batteries down to 40V.