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Flexboss21 and Gridboss with Ruixu Lithi2-16 Com Error W004 - Battery Status Check

EatonPV

Solar Nube!
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Dec 4, 2024
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The Last Best Place, MT
I recently installed the Gridboss and Flexboss21 with the ruixu Lithi2-16 wallmount battery. This is my first solar install. Any tips, troubleshooting or support resources would be greatly appreciated. I've been working on this for over a week and I am out of ideas. Here is the issue:

I get an error when I try to enable closed communication. I set the inverter type on the battery to "Luxpower" and the lithium brand to type 6 (also tried types 0 and 4) on the Flexboss. When I restart the battery and inverter I immediately get a warning light on the inverter and see an open "W004: Battery status check" notice listed in the EG4 monitor event history. According to Signature Solar tech support this message indicates a battery status check failure caused by BMS fault or the inverter receiving unexpected information. The error disables charge and discharge of the battery so nothing works, it's basically in standby mode. I do not see any warnings or messages on the battery display screens. The inverter settings have been checked by S2 support and I tried new com cables but the same issue persists.

It is currently working in lead acid mode with no communication. I'm not sure if the problem is an EG4 software bug, incorrect inverter setting(s), or something on the battery/BMS side. Signature Solar support has forwarded the case to EG4 engineers but since this is not an officially supported battery brand I'm not sure how much effort they will put into diagnosing the issue. I was planning on adding two more of these battery banks but I need to figure out the coms issue first.

As a test I tried setting the battery inverter type to PYLON and the lithium brand to type 2 on the Flexboss. This actually worked for a couple of hours without error but when it switched from battery to grid I got a W000: Communication failure with battery notification and it stoped working.

Has anyone successfully installed the Gridboss/Flexboss and the Lithi2-16 using closed communications? I emailed techsupport@ruixubattery.com but have not heard back yet. Hopefully I have not been cut by the bleading edge of technology that I tend to constantly gravitate toward! Please help...

System:
- FlexBoss 21 inverter
- GridBoss MID
- RUiXU Lithi2-16 wallmount battery bank
- 22 Vicram PREXOS SERIES 6 375w bifacial panels in 2 11 pannel strings
- Ground mounted with IntegraRack IR-30 BallastRack and IR AnchorSpikes
- https://signaturesolar.com/content/...ikram Prexos 375W Solar Panel - Datasheet.pdf
 
Last edited:
Have you seen this video? There’s an example setup 7min in. I have the Riuxu 16kwh wall mount battery and will have the Eg4 8k all in one hybrid shipped soon. Similar situation to your setup and I hope I can get successful Bms connection.

 
I recently installed the Gridboss and Flexboss21 with the ruixu Lithi2-16 wallmount battery. This is my first solar install. Any tips, troubleshooting or support resources would be greatly appreciated. I've been working on this for over a week and I am out of ideas. Here is the issue:

I get an error when I try to enable closed communication. I set the inverter type on the battery to "Luxpower" and the lithium brand to type 6 (also tried types 0 and 4) on the Flexboss. When I restart the battery and inverter I immediately get a warning light on the inverter and see an open "W004: Battery status check" notice listed in the EG4 monitor event history. According to Signature Solar tech support this message indicates a battery status check failure caused by BMS fault or the inverter receiving unexpected information. The error disables charge and discharge of the battery so nothing works, it's basically in standby mode. I do not see any warnings or messages on the battery display screens. The inverter settings have been checked by S2 support and I tried new com cables but the same issue persists.

It is currently working in lead acid mode with no communication. I'm not sure if the problem is an EG4 software bug, incorrect inverter setting(s), or something on the battery/BMS side. Signature Solar support has forwarded the case to EG4 engineers but since this is not an officially supported battery brand I'm not sure how much effort they will put into diagnosing the issue. I was planning on adding two more of these battery banks but I need to figure out the coms issue first.

As a test I tried setting the battery inverter type to PYLON and the lithium brand to type 2 on the Flexboss. This actually worked for a couple of hours without error but when it switched from battery to grid I got a W000: Communication failure with battery notification and it stoped working.

Has anyone successfully installed the Gridboss/Flexboss and the Lithi2-16 using closed communications? I emailed techsupport@ruixubattery.com but have not heard back yet. Hopefully I have not been cut by the bleading edge of technology that I tend to constantly gravitate toward! Please help...

System:
- FlexBoss 21 inverter
- GridBoss MID
- RUiXU Lithi2-16 wallmount battery bank
- 22 Vicram PREXOS SERIES 6 375w bifacial panels in 2 11 pannel strings
- Ground mounted with IntegraRack IR-30 BallastRack and IR AnchorSpikes
- https://signaturesolar.com/content/downloads/Spec sheets/Vikram Prexos 375W Solar Panel - Datasheet.pdf
You can go to lead acid battery mode then advanced settings where you can set all the charging parameters and it should work.
 
You can go to lead acid battery mode then advanced settings where you can set all the charging parameters and it should work.
That makes some sense. Are you referring to the float and absorb voltages under the "old settings". I'll need to do some more research on this. I have it set to 56.8 and 54.6 as indicated in the battery doc.

This is my first experience with solar and energy storage so forgive my ignorance. I am having a hard time charging the battery to 100% using pv. When the battery is charging at a high rate it seems to increase the voltage reading in relation to the state of charge listed on the battery.

I set the "System Charge Volt Limit" to 55.5 and if I'm charging with lots of pv it will shut down charging and the soc on the battery may indicate less than 90%. The voltage settles on the battery but it does not start charging again that I can tell. It would be nice if the inverter would know the battery was getting full and reduce the amps to minimize the voltage spike associated with high charge rates.

I am having a similar issue trying to fully discharge my battery. If I get a big load when the battery is a bit low, the voltage drops below my on-grid shut off voltage of 48v (which I thought would indicate empty?) Any advice would be appreciated. I have had a few emails with Ruixu support but haven't heard back in a few days after sending my firmware version. We will see I guess. It's just frustrating that this seems to work for others using various EG4 inverters but I can't find anyone with the flexboss and this battery that is sharing...

Thank you for your response.
 
Have you seen this video? There’s an example setup 7min in. I have the Riuxu 16kwh wall mount battery and will have the Eg4 8k all in one hybrid shipped soon. Similar situation to your setup and I hope I can get successful Bms connection.

Yes, I have seen this, several times actually, trying to glean a new idea to try (thanks Will for showing how it SHOULD work). I have tried setting it as Luxpower on the battery and lithium type 6 in the inverter settings but I get this error. I also tried as type 4 per S2 support and type 0 just for shits.

The closest I have gotten to making this work was setting the battery and inverter to a 3rd party vendor that they both support. I set the battery inverter type to PYLON and the lithium brand to type 2 on the Flexboss. This actually worked for over an hour without error but when it switched from battery to grid I got a "W000: Communication failure with battery" notification and the inverter stopped working and went into standby mode with a notice light. The fact that it worked without error for some time could indicate there is not a BMS fault in the battery as suggested by the error. I hope this is a simple EG4 or Ruixu software bug but I guess I need to prove that somehow before I will get any help from "corporate".
 
Have you tried battery type #1 on the inverter with the batteries set to Luxpower or pylontech?
That is one combo that I have not tried. I will give it a go and let you know. The changeover outage kills my internet so it may take a min....

Should I totally disconnect power and battery to the flexboss after making the change or does going from standby to lithium with the automatic restart that happens do the trick. It seems to totally reset after changing from lead acid to lithium even if set to standby first. Takes the power down for 5+ seconds as well.

Thank you so much for the post and something to try. Fingers crossed!!!!
 
Have you tried battery type #1 on the inverter with the batteries set to Luxpower or pylontech?
All hail the Emperor Of Solar!!! You are a goddamn genius! Type 1 on the inverter and PYLON on the battery seems to have done the trick. I can't tell you how happy that makes me ;) It did not work at all when the battery was set to luxpower btw regardless of the brand type.

I will update if anything changes but so far so good!
 
Added note: we have it working too (FlexBoss21 and 4xRUiXU batteries). The trick was to ALSO make sure the batteries are on rev 3 of the firmware, which came out in late October or early November. Our batteries were delivered in November and were on rev 2.
 
All hail the Emperor Of Solar!!! You are a goddamn genius! Type 1 on the inverter and PYLON on the battery seems to have done the trick. I can't tell you how happy that makes me ;) It did not work at all when the battery was set to luxpower btw regardless of the brand type.

I will update if anything changes but so far so good!
Post in thread 'Flexboss21 and Gridboss with Ruixu Lithi2-16 Com Error W004 - Battery Status Check' https://diysolarforum.com/threads/f...-w004-battery-status-check.97594/post-1323475
 

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