Hi, I have 2 x 12kw 3ph Deye inverters linked in parallel. I also have 3x Dyness 10.4kw powerwall batteries. 
 

When in parallel mode the inverters does not take power from the batteries, although the battery BMS is working and showing percentage available on both inverters but when I only run the master ( not in parallel mode) everything works fine. 
 

is there a setting I am missing?

11 minutes ago, riaanp34 said:

Hi, I have 2 x 12kw 3ph Deye inverters linked in parallel. I also have 3x Dyness 10.4kw powerwall batteries. 
 

When in parallel mode the inverters does not take power from the batteries, although the battery BMS is working and showing percentage available on both inverters but when I only run the master ( not in parallel mode) everything works fine. 
 

is there a setting I am missing?

Parallel operation is a bit tricky but here is a quick checklist:

1. Same inverter software - both inverters should be on the same firmware as closely as possible
2. Turn on the master battery first
3. Ensure the master battery is connected to the master inverter for comms purposes - then ensure that all other batteries are connected to the master appropriately
4. Ensure any and all dip switches are set accordingly
5. Follow the appropriate turn-on process to Inverter, DC and AC
6. Ensure that the breakers are set properly and not tripped

 

Thanks, software is the same. Do the dip switches in the two inverters need to change? And also in terms of the comms cables between the inverters is it from A to A or from A to B

On 2023/06/14 at 10:20 PM, mzezman said:

Parallel operation is a bit tricky but here is a quick checklist:

1. Same inverter software - both inverters should be on the same firmware as closely as possible
2. Turn on the master battery first
3. Ensure the master battery is connected to the master inverter for comms purposes - then ensure that all other batteries are connected to the master appropriately
4. Ensure any and all dip switches are set accordingly
5. Follow the appropriate turn-on process to Inverter, DC and AC
6. Ensure that the breakers are set properly and not tripped

 

Hi , is it possible to have paralel connection between 2 devices Deye  12 kw WITHOUT battery?

Thanks

20 hours ago, ico said:

Hi , is it possible to have paralel connection between 2 devices Deye  12 kw WITHOUT battery?

Thanks

It should be possible yes … I suggest contacting an authorised installer for the details though 

21 hours ago, ico said:

Hi , is it possible to have paralel connection between 2 devices Deye  12 kw WITHOUT battery?

Thanks

I also don't see it as a problem. It's is the grid to both that must synchronize and that is taken care of but may be a novice like me is missing something. 

@TaliaB

On 2023/12/06 at 7:46 PM, Scorp007 said:

I also don't see it as a problem. It's is the grid to both that must synchronize and that is taken care of but may be a novice like me is missing something. 

@TaliaB

Hi. Was this problem finally resolved. I have two units (12-kW) that were commissioned in early 2023, and now suddenly have a parallel problem. They are also linked to a 30-kWh battery bank. Recently, I commissioned two 5-kW parallel, and the newer unit has an f29 fault. It worked for two weeks. The Deye people are saying it's parallel chip failure and both pairs (12 and 5-kW) must be taken to the workshop to replace the defective chips. So far I havent done that as I suspect there's more to this than just chip failures. Any advice/opinion?

On 2023/06/14 at 9:05 PM, riaanp34 said:

Ahoj, mám paralelne zapojené 2 x 12kw 3ph Deye meniče. Mám aj 3x batérie Dyness 10,4kw powerwall. 
 

V paralelnom režime striedače neberú energiu z batérií, aj keď batériový BMS funguje a zobrazuje dostupné percentá na oboch striedačoch, ale keď spustím iba master (nie v paralelnom režime), všetko funguje dobre. 
 

chýba mi nejaké nastavenie?

How did you fix this problem? I have some too. The battery is 100% and does not use battery power in parallel mode.

I seem to be having the same issue:

Upgraded to 2x Deye 5kW inverters, old one Master (01), new one Slave (02). Batteries are connected to Master using CAN cable. PV is charging the batteries fine and also supplying to the loads (essential and non-essential), but the batteries are not being used for loads. When PV is gone the batteries discharge at around 100W (I assume powering the inverter(s)), but Grid is used for loads:

Master inverter is reporting BMS values correctly, but slave not. I assume that is since it is not directly connected to the batteries? Or should I expect the Slave inverter to report the same values from the parallel connection?
There are no (parallel) errors reported by either of the inverters. The batteries are set to discharge down to 20%.

The slave inverter has newer firmware since it is 2 years newer, and it is the Deye 5kW "SA version" while the older one is not. Should the master inverter's FW be updated somehow?

43 minutes ago, Karnallie said:

I seem to be having the same issue:

Upgraded to 2x Deye 5kW inverters, old one Master (01), new one Slave (02). Batteries are connected to Master using CAN cable. PV is charging the batteries fine and also supplying to the loads (essential and non-essential), but the batteries are not being used for loads. When PV is gone the batteries discharge at around 100W (I assume powering the inverter(s)), but Grid is used for loads:

Master inverter is reporting BMS values correctly, but slave not. I assume that is since it is not directly connected to the batteries? Or should I expect the Slave inverter to report the same values from the parallel connection?
There are no (parallel) errors reported by either of the inverters. The batteries are set to discharge down to 20%.

The slave inverter has newer firmware since it is 2 years newer, and it is the Deye 5kW "SA version" while the older one is not. Should the master inverter's FW be updated somehow?

It is the norm to always have the same version firmware and only then run in parallel.

Yeah the Firmware needs and upgrade on the primary inverter. The BMS screen on the secondary inverter wont show any usable values - only the primary inverter will show usable values. Ideally once everything is in sync a change on the primary will cascade / apply on the secondary as well within a second or so

16 minutes ago, mzezman said:

Yeah the Firmware needs and upgrade on the primary inverter. The BMS screen on the secondary inverter wont show any usable values - only the primary inverter will show usable values. Ideally once everything is in sync a change on the primary will cascade / apply on the secondary as well within a second or so

So I was mistaken - enabling time of use the battery does get discharged to the loads down to the % specified. Without time of use enabled the batteries do not discharge other than to the inverter or with grid off. I seemed to recall that with time of use off and grid charge disabled the batteries would discharge down to the values specified, but my system was offline for a few months (construction) so I forgot. Parallel setup is working fine now with time of use setup, even with different firmware.

I used to use Solar Assistant to toggle on/off the time of use depending on immenent load shedding and the battery soc, but that would have depended on the batteries actually discharging with ToU off. So not sure how that used to work anymore.

Thanks for the info about the Bms data on the secondary inverter - that is reassuring. I am not seeing other settings explicitly syncing to the slave inverter though, eg ToU enable/disable, grid charge, battery charge/discharge currents, zero export. Should I expect those to be the same on the slave inverter when changed master side, or do you still configure them explicitly on the slave as well? That might be where exactly matching FW comes into play.

2 hours ago, haudevbe said:

It sounds like you're experiencing issues with Deye inverters when operating them in parallel. Parallel operation of inverters can sometimes be tricky, but with the right setup, it can be very effective for scaling up your solar power system.

Here are some common issues and solutions when running Deye inverters in parallel:

1. Inverter Synchronization:

• Issue: Deye inverters in parallel need to be properly synchronized to work together. If the inverters are not correctly configured, they may cause phase mismatches, overloading, or system shutdowns.

• Solution: Ensure that all inverters are configured to operate in parallel mode (check the settings in the inverter’s configuration menu). You may need to enable the parallel function through the inverter's communication setup or by using a master-slave configuration where one inverter serves as the master and others as slaves.

2. Communication Between Inverters:

• Issue: Deye inverters often use communication cables or a CAN bus to link the inverters together. If the communication between inverters is faulty, it can lead to problems such as uneven load sharing, inverters not working together, or even system failure.

• Solution: Check that the communication cables are correctly connected and that the inverters are using the correct communication protocol. If you're using a communication gateway or Modbus controller, ensure it's properly configured.

3. Inverter Overload:

• Issue: When inverters are connected in parallel, they share the total system load. If one inverter is overloaded, it can shut down or cause the entire system to underperform.

• Solution: Monitor the load distribution across the inverters. Ideally, you want each inverter to handle an equal share of the load. You may need to adjust the settings to limit the output of each inverter to prevent overload.

4. Inverter Software or Firmware:

• Issue: Sometimes, the issue can be related to outdated firmware or software in the inverters, leading to instability in parallel operation.

• Solution: Check for firmware updates from Deye’s official support or website. Update the firmware on all inverters to ensure they are running the most stable version of the software.

5. Voltage Imbalance:

• Issue: When inverters are operating in parallel, they must share the same DC input voltage from the solar panels. If there’s a voltage imbalance, one or more inverters may not work as expected.

• Solution: Verify that the solar panel strings connected to each inverter have the same output voltage. If you are using multiple strings of panels, ensure that the total voltage from each string is within the inverter’s operational range.

6. Battery Bank Configuration (if hybrid system):

• Issue: If you have battery storage integrated with the Deye inverters, the parallel operation may also involve issues with the battery bank configuration, such as voltage differences or charging inconsistencies between inverters.

• Solution: Make sure that the battery voltage and charge/discharge parameters are configured correctly across all inverters. Verify that the inverters are correctly linked to the battery management system (BMS) and are set up to share the load efficiently.

7. Inverter Monitoring and Performance:

• Issue: Parallel systems can sometimes experience issues with monitoring, where the performance or status of one inverter might not be visible on the monitoring system, leading to confusion or incorrect readings.

• Solution: Make sure the monitoring system (if using one) is properly configured to read data from all inverters in parallel. Check the app or web portal for any error codes or diagnostic tools.

8. Proper Sizing of System:

• Issue: If you're adding more inverters to your system, system sizing might become an issue. Each inverter in parallel needs to be properly sized to handle its share of the load and potential peaks.

• Solution: Ensure that your solar array and battery bank are correctly sized to match the number of inverters in parallel. You might need to recheck the total system capacity to avoid overloading.

What You Can Do:

• Check all connections between the inverters to ensure that they are securely installed and communicating.

• Consult the manual of your specific Deye inverter model for any specific parallel configuration instructions.

• Contact Deye’s technical support for troubleshooting assistance or if you suspect hardware or software issues.

Would you be able to provide more specifics about the issues you're facing, such as error codes or symptoms you're noticing with the parallel setup? That could help pinpoint the problem more accurately.

No thanks to your AI response