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WatchMon Network Issue
#1
Hi DIYers,

I have doubled my Leaf modules. 14S14P. Now I'm having failed communication between LeafMons and WatchMon. The LED Device Identifier function works and correctly identifies all 14 LeafMons but the network test fails. Nothing received. I had to extend the last set of wires by a couple feet due to battery pack configuration and continuity tests as good. I have a message into Batrium, but I was wondering if anyone here had some suggestions. Thanks.
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#2
(09-17-2020, 06:20 PM)ZimInSeattle Wrote: Hi DIYers,

I have doubled my Leaf modules. 14S14P. Now I'm having failed communication between LeafMons and WatchMon. The LED Device Identifier function works and correctly identifies all 14 LeafMons but the network test fails. Nothing received. I had to extend the last set of wires by a couple feet due to battery pack configuration and continuity tests as good. I have a message into Batrium, but I was wondering if anyone here had some suggestions. Thanks.
I've struggled with this myself.   Initially, it was because I didn't twist my extender wire (about 6 feet).  Once I twisted the wire pairs appropriately - it worked (polled/tested OK).

Since then....  I'm up to 84 longmons with 30-40ft total path and it works most of the time.

I had a failed longmon that caused trouble - and once it was replaced things worked again.   If found this by unplugging/plugging in each longmon...  they do that self test when you put power to them.   The bad one didn't do a proper power-up test - e.g. green led and then red (if I recall correctly).

I also had a case where it was running fine, didn't touch anything and it 'just stopped' polling - happened twice this year within a week of each other.   I reboot the WM4 and it makes no difference - multiple network tests failed...  even though visually it looked like it was polling (e.g. green lights rippling thru the packs).  Then, out of desperation, I unplugged one of the longmons in the chain,  plugged it back in / rebooted and it resumed polling/working again - not sure what that was all about.    
But since then its been running OK again. 

I look forward to hearing what you find out Smile
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#3
(09-17-2020, 08:17 PM)OffGridInTheCity Wrote:
(09-17-2020, 06:20 PM)ZimInSeattle Wrote: Hi DIYers,

I have doubled my Leaf modules. 14S14P. Now I'm having failed communication between LeafMons and WatchMon. The LED Device Identifier function works and correctly identifies all 14 LeafMons but the network test fails. Nothing received. I had to extend the last set of wires by a couple feet due to battery pack configuration and continuity tests as good. I have a message into Batrium, but I was wondering if anyone here had some suggestions. Thanks.
I've struggled with this myself.   Initially, it was because I didn't twist my extender wire (about 6 feet).  Once I twisted the wire pairs appropriately - it worked (polled/tested OK).

Since then....  I'm up to 84 longmons with 30-40ft total path and it works most of the time.

I had a failed longmon that caused trouble - and once it was replaced things worked again.   If found this by unplugging/plugging in each longmon...  they do that self test when you put power to them.   The bad one didn't do a proper power-up test - e.g. green led and then red (if I recall correctly).

I also had a case where it was running fine, didn't touch anything and it 'just stopped' polling - happened twice this year within a week of each other.   I reboot the WM4 and it makes no difference - multiple network tests failed...  even though visually it looked like it was polling (e.g. green lights rippling thru the packs).  Then, out of desperation, I unplugged one of the longmons in the chain,  plugged it back in / rebooted and it resumed polling/working again - not sure what that was all about.    
But since then its been running OK again. 

I look forward to hearing what you find out Smile
Thanks for the tips Offgrid. I can get the first 3 Leafmons to work. When I plug into any of the 4 in the left cabinet, it flashes red LED and shuts off. Verified all my wires on the right packs. Thought it might be that I hadn't installed ground strap on left cabinet. Did that and the Leafmons didn't shut off one time, but wouldn't communicate either. Now they just shut off again. I'm stumped. Not sure I want to charge up without seeing temps and voltages of the 4 packs in the new configuration.

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#4
(09-18-2020, 12:45 AM)ZimInSeattle Wrote: Thanks for the tips Offgrid. I can get the first 3 Leafmons to work. When I plug into any of the 4 in the left cabinet, it flashes red LED and shuts off. Verified all my wires on the right packs. Thought it might be that I hadn't installed ground strap on left cabinet. Did that and the Leafmons didn't shut off one time, but wouldn't communicate either. Now they just shut off again. I'm stumped. Not sure I want to charge up without seeing temps and voltages of the 4 packs in the new configuration.
Not understanding your process.   Grounding doesn't have anything to do with Longmons - and I don't imagine Leafmons care about grounding either.  They simply get power from + and - of the cell and then are added to a communication loop/chain so a WM4 can read them. 

To debug this - suggest you start with something that works (e.g. you say 4 of them work?) and then add a 5th one.  If that work, then add a 6th one, etc....

To add one to a working chain:
1) First test the Leafmon in isolation.  Disconnect it from the chain...  and the cell...  and then reconnect it to the cell (e.g. power it up) and verify that the green led comes on, and then the red for a moment.   If this doesn't work, then maybe you have them hooked at 8.4v? instead of 4.2v?  (I know leaf units have 2s inside) OR maybe they are shorted/broken somehow? - I think Batrium should be able to clarify this point.   

2) If it passes the boot test in #1 - then plug it into the chain and see if the chain continues to work.     
2a) If it doesn't work, then instead of adding it as 5th one, plug it in in place of one of the 4 that do work...   this should eliminate 'wiring' as the issue.
2b) If it still doesn't work...  then something is really wrong.

3) If it works.. Smile  them move on to the next one and repeat till you isolate the bad one(s). 

That's my best advice at this point - do some kind of methodical process.
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#5
Also beware that the black coating on the longmons is not electrically isolating & you could easily get a short to the cabinet metalwork (especially if grounded).
If your leads allow, you can move the comms cable to "jump over" one longmon.

I wired my longmon chain (total 64 longmons in 4x LiFePo4 battery banks) via a Cat6 data patch strip.
Each battery has a Cat6 cable running to it for the 16 longmons there.
I can swap the Cat6 cables positions to test any one battery to see if those 16 are working.
I have had a few fail & was able to quickly isolate to which battery & use the "jumper over" trick to locate within the 16.
 
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#6
(09-18-2020, 01:07 AM)OffGridInTheCity Wrote: Not understanding your process.   Grounding doesn't have anything to do with Longmons - and I don't imagine Leafmons care about grounding either.  They simply get power from + and - of the cell and then are added to a communication loop/chain so a WM4 can read them. 

To debug this - suggest you start with something that works (e.g. you say 4 of them work?) and then add a 5th one.  If that work, then add a 6th one, etc....

To add one to a working chain:
1) First test the Leafmon in isolation.  Disconnect it from the chain...  and the cell...  and then reconnect it to the cell (e.g. power it up) and verify that the green led comes on, and then the red for a moment.   If this doesn't work, then maybe you have them hooked at 8.4v? instead of 4.2v?  (I know leaf units have 2s inside) OR maybe they are shorted/broken somehow? - I think Batrium should be able to clarify this point.   

2) If it passes the boot test in #1 - then plug it into the chain and see if the chain continues to work.     
2a) If it doesn't work, then instead of adding it as 5th one, plug it in in place of one of the 4 that do work...   this should eliminate 'wiring' as the issue.
2b) If it still doesn't work...  then something is really wrong.

3) If it works.. Smile  them move on to the next one and repeat till you isolate the bad one(s). 

That's my best advice at this point - do some kind of methodical process.
Hi OffGrid, I've done all the debugging you describe. The 3 Leafmons in R/H cabinet work. The reason I ground the cabinets is for AC noise. Car charger and XW+ really close by. The twisting of the wires is to cancel noise. The 4 Leafmons in the L/H cabinet boot up properly but when I try to add any one of them to the daisy chain, red LED flashes and it shuts off. Too weird.

(09-18-2020, 08:24 AM)Redpacket Wrote: Also beware that the black coating on the longmons is not electrically isolating & you could easily get a short to the cabinet metalwork (especially if grounded).
If your leads allow, you can move the comms cable to "jump over" one longmon.

I wired my longmon chain (total 64 longmons in 4x LiFePo4 battery banks) via a Cat6 data patch strip.
Each battery has a Cat6 cable running to it for the 16 longmons there.
I can swap the Cat6 cables positions to test any one battery to see if those 16 are working.
I have had a few fail & was able to quickly isolate to which battery & use the "jumper over" trick to locate within the 16.
 
Hi Redpacket, thanks for the info. I'll try to make sure my Leafmons are isolated from metal framework.
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#7
Have you synced the mons with correct number of cells? (Perhaps you mentioned it but it happen people forget that when changing the chain)

Ie common mistake Smile
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#8
(09-18-2020, 03:14 PM)daromer Wrote: Have you synced the mons with correct number of cells? (Perhaps you mentioned it but it happen people forget that when changing the chain)

Ie common mistake Smile
Can't get the last 4 Leafmons to remain powered up when I try to connect. Thus no network connectivity or opportunity to sync.
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#9
They are powered up. They dont have to be lid for that to work.

The network con or sync will not show untill they are synced...

So when you run the sync look at all that blinks. the ones NOT blinking are the ones not getting the sync-signal. Check the cable before the node that aint blinking at all!

The only reason a mon will shut down is if the cell in question is dead low.
NOTE! My links supplied in this message may be affiliated with Ebay and by clicking on them you agree on the terms.
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 100kWh LiFePo4 | 20kWh 14s 18650 |  66*260W Poly | ABB S3 and S5 Trip breakers
Upcoming: 14S 18650~30kWh
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#10
I've noted that the 4 Leafmons I'm having problems with all power up normally and the green LED's remain on for a while, but then they turn off. Is this normal behavior when they aren't connected to the daisy chain? Thanks.
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