Batrium BlockMon-8 Voltage & Temperature Issues

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guittal

New member
Joined
Oct 5, 2020
Messages
2
Hello everyone,

I've been running my Batrium system for a couple of years now and have been satisfied, until now. My BlockMon-8s are starting to fail:
  • I recently replaced 2 units due to bad voltage readings (out of specs).
Now, I have:
  • 3 units that show incorrect voltage readings (but are still within specs: -0.7, -0.5V, +0.4V from 3.32V/cell right now). A serious inconvenience.
  • 2 units that show incorrect temperature readings (out of specs: -23C, -10C from 29C right now). Critical issues.
  • All units have passed the: network, synchronization & bypass tests.
I haven't changed any hardware or made any significant adjustments to my system and rarely (but regularly) top balance. Is there any way to correct those incorrect readings or is it a case of having to replace those units? Has anyone else started to see BlockMon or CellMon failures after some time in operation?

Much appreciated!

lg
 

Korishan

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Jan 7, 2017
Messages
6,549
Have you contacted their support email with the issue?
 

guittal

New member
Joined
Oct 5, 2020
Messages
2
Korishan said:
Have you contacted their support email with the issue?
Hi Korishan,

Yes, I have. For the first failure, they offered to RMA the unit. For the second issue, it seems that I'm on my own since the BlockMon is now 2 years old and they told me that my earlier RMA was a good gesture on their part (i.e. not a normal occurrence). On the basis of their answer for my 2nd issue, I haven't yet reached out to them yet (assuming that the answer is likely to be the same... out of warranty).

I wanted to know if anyone had experienced similar issues before reaching out to Batrium.

Thanks!

lg
 

Redpacket

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Feb 28, 2018
Messages
1,302
If you run them bypassing a lot with the temp limits at default 75degC, they're likely to fail earlier.
Have you tried removing power from the affected ones, re-installing & re-syncing?
I have a had a few longmon failures & keep spares on hand.
Bypassing & inherent temp cycling is a stressful job....
 

OffGridInTheCity

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Dec 15, 2018
Messages
1,738
Redpacket said:
If you run them bypassing a lot with the temp limits at default 75degC, they're likely to fail earlier.
Have you tried removing power from the affected ones, re-installing & re-syncing?
I have a had a few longmon failures & keep spares on hand.
Bypassing & inherent temp cycling is a stressful job....
I have 84 longmons and counting... so this is a key topic for me. Appreciate you sharing info on this :)
I do avoid hi-heat (bypass) by setting"Bypass Temp Limit" at 55C on the Hardware -> CellMon page (which appears to work)and I only bypass / balance when needed - literally auto-balance for only 8 days this year when adding new batteries.
 

jtvt

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Mar 5, 2021
Messages
4
Sorry to drag up this old thread, but I seem to be hitting this issue.

I put together a new 16s2p battery early this year. I added another 2 strings in July. In april, I had a blockmon 8 intermittently flash 0v during bypass which triggered a system shutdown. This repeated a few times. Voltmeter indicated this was not a correct voltage. I cleaned battery connections, but the problem continued. I replaced that blockmon and cable and the problem went away.
Now in September a different blockmon on the original strings has flashed 0v. This was again in bypass. I have the default thermal settings for bypass. Other than the 0v flash during, the blockmon seems to work fine. Network, bypass, etc tests all are good. I suspect the issue is due to thermal stress.

Any tips on avoiding future problems? Looks like dropping the bypass temp limit and reduce balancing is a fix.
 

OffGridInTheCity

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Any tips on avoiding future problems? Looks like dropping the bypass temp limit and reduce balancing is a fix.
I have longmons 3yrs old now but I don't balance much. My last balance (of 84 packs) was March 25, 2021 to 40mv-60mv max diff (thru a daily cycle). 6 months later (today) I'm at 50-80mv thru the daily cycle. Since I run between 3.5v/cell and 4.0v/cell.. an 80mv max difference is not really an issue and so I fight my OCD and just let it be. At this rate - I may go a year before 100mv max diff and my next Auto-Level touch up. An Auto-Leve touchup takes 2-4 days.

In other words, I only use the balance feature (heat/stress?) of my mons a few days a year. This might work for you as well going forward.

On the other hand - seems like mons should be hardier due to the $$ :)
 

jtvt

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Mar 5, 2021
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4
Thanks. Yeah, I've been balancing almost every day. I probably don't need to. I use the 280ah prismatic cells and typically they are off by .03v. I may try dropping the bypass temp limit. Other than that, I suppose I can move to manual balancing every couple weeks. Although I would rather the blockmons hold up better.

I sent email to Batrium today regarding this so maybe they have some input.
 

Redpacket

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Feb 28, 2018
Messages
1,302
a blockmon 8 intermittently flash 0v during bypass
This seems to be an issue, I get this when bypassing as well, even with low bypass current & low temp rise.
I have 32 blockmons & 32 longmons in service.
All the wires are twisted to reduce interference.
It seems to be related to the electrical noise the bypassing process generates.

When bypassing each longmon/blockmon is switching on/off it's load resistors quite fast, eg 500Hz - 1kHz, you can hear them buzzing sometimes.
Eg like this
- switch load R off, measure volts & temp
- switch load R on for a bit
- switch load R off, measure volts & temp
- switch load R on for a bit
repeat...
While doing this it is still getting polled by the watchmon & reporting data.
Could also be a s/w or h/w bug where the longmon/blockmon can't switch & reply at the same time (or glitches)

Putting a fan on the longmon/blockmons is a good idea, I have the watchmon turn on an output to run a 12V fan when bypassing - works nicely keeping the temps down.
 
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