cheap CellLog with alarm port for additional level of safty

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Christian

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May 6, 2017
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I've been looking into a backup solution in case of failure of the BMS, solar regulator, grid charger or alternator in my RV
The CellLog is a monitoring device for up to 8s with programmable alarms for
low V and over V, per cell,
low V and over V, total
cell unbalance

It has an alarm output and my plan is to use this output to trip all my circuit breakers if something goes wrong, using a din rail mountable remote triper. Similar to this

For example: If the SBMS is set to end charge at 3,95V per cell, I would set the CellLog to 4V

The alarm output is 500ma open collector 50V max, and the tripper uses 6W so in 24V it should work without relays.

CellLog 8M is around 18$ (http://www.progressiverc.com/media/CellLog 8M.pdf)
Din rail remote triper is around 50$ (for example: http://www.legrand.sk/sites/default/files/userfiles/files/Vypinacia spust [EN].pdf)


What do you think?
 
I will report back after testing, I'm still waiting for the remote shunt tripper and dc circuit breaker. I already played around with the cellLoger, seems (surprisingly) reliable and accurate.

I lately lost so much time with ripoff fake chinisiumtp4056 clones an XH-M604 battery destroyer...
 
Christian said:
I lately lost so much time with ripoff fake chinisiumtp4056 clones
Click to expand...

????? I haven't had any issues with these boards. What happened?
 
One thing to note with the celllog monitors. I saw a youtube video and read somewhere that they can drain your pack unevenly.
 
Wattsup said:
One thing to note with the celllog monitors. I saw a youtube video and read somewhere that they can drain your pack unevenly.
Click to expand...

I'm using the celllog as part of my <$100 BMS system that I'm still tinkering with.

Saw that youtube video too and that guy didn't do any research. He even thinks that it's a balancer (which it is not). The manufacturer is active on the rcgroups and they provided a fix for it. For some reason they designed it to drain from cells 1-6 but not 7-8. So after a while if you are not running a balancer (or especially if you think the celllog is balancing your packs) you will find that cells 7 and 8 will be higher than the others.

The fix is simple, just jumper a connection.
https://www.rcgroups.com/forums/sho...ellLog-and-PowerLog-have-been-released!/page9
 
not2bme said:
Wattsup said:
One thing to note with the celllog monitors. I saw a youtube video and read somewhere that they can drain your pack unevenly.
Click to expand...

I'm using the celllog as part of my <$100 BMS system that I'm still tinkering with.

Saw that youtube video too and that guy didn't do any research. He even thinks that it's a balancer (which it is not). The manufacturer is active on the rcgroups and they provided a fix for it. For some reason they designed it to drain from cells 1-6 but not 7-8. So after a while if you are not running a balancer (or especially if you think the celllog is balancing your packs) you will find that cells 7 and 8 will be higher than the others.

The fix is simple, just jumper a connection.
https://www.rcgroups.com/forums/sho...ellLog-and-PowerLog-have-been-released!/page9
Click to expand...
You're aware of it. Cool, carry on as you were ;)

I'll be following, I'm interested to see your results
 
Korishan said:
Christian said:
I lately lost so much time with ripoff fake chinisiumtp4056 clones
Click to expand...

????? I haven't had any issues with these boards. What happened?
Click to expand...

I connect 5 v from the power-supply, and in the next 20sec 4 of 20 let the smoke out (one of the passives on the output side starts smoking). Next I disconnect the fried boards, and check the output from my power-supply with a different voltmeter. My power-supply is not very stable but I am sure I stayed within +/-10% range. I reconnect and 5minutes later 5 more where fried. 2 h later I measured 4,25V on a cell, and decided to dump all all the boards.
There are some clones of the TP4056chip itself out there, and for everyclone there are some circuit board variations.
On a endless sphere, somebody was saying that only the chip with the big F is genuine. I guess I was just unlucky when picking a seller.
Anyway, playing with lithium cells we should always, plan for the worst case and not keep flamable or valuable stuff around the battery testing area.

Wattsup said:
One thing to note with the celllog monitors. I saw a youtube video and read somewhere that they can drain your pack unevenly.
Click to expand...

I'm aware of it, but since I be using a BMS, the pack is going to stay balanced... as long as it uses less than the balancing current of the BMS
... actually I'm just realising I dont know the current draw of the cellLog... and I'm off to my workshop
 
That stinks. (both in the general unfortunate, and the smell). Sorry to hear you had a bad batch. The only time mine blew up was when I put cell in backwards. So far I've used probably over 25 boards or so and haven't had any issues with charging. They shut off when they are supposed to and put up quite a fight against those red hot tamale's.

Which seller did you buy from? This way other can steer clear of them.
 
not2bme said:
Wattsup said:
One thing to note with the celllog monitors. I saw a youtube video and read somewhere that they can drain your pack unevenly.
Click to expand...

I'm using the celllog as part of my <$100 BMS system that I'm still tinkering with.

Saw that youtube video too and that guy didn't do any research. He even thinks that it's a balancer (which it is not). The manufacturer is active on the rcgroups and they provided a fix for it. For some reason they designed it to drain from cells 1-6 but not 7-8. So after a while if you are not running a balancer (or especially if you think the celllog is balancing your packs) you will find that cells 7 and 8 will be higher than the others.

The fix is simple, just jumper a connection.
https://www.rcgroups.com/forums/sho...ellLog-and-PowerLog-have-been-released!/page9
Click to expand...
Has the manufacturer corrected this or do you still need to do the fix yourself?
 
Korishan said:
That stinks. (both in the general unfortunate, and the smell). Sorry to hear you had a bad batch. The only time mine blew up was when I put cell in backwards. So far I've used probably over 25 boards or so and haven't had any issues with charging. They shut off when they are supposed to and put up quite a fight against those red hot tamale's.

Which seller did you buy from? This way other can steer clear of them.
Click to expand...

I bought it from muhrmedia on german ebay.
Acording to varius discussions on other forms the geniune ones have en F logo like the one on the right:

image_sdwyin.jpg


Mine looks like this (yes with the burn marks on the IC:



image_cssych.jpg



there are at least 3 clones out there, and i assume some even copy the original logo, so the best advice would probably be to connect a multimeter, and test that the circuit does what it is supposed to do and check temperature before letting it charge unsupervised.
 
Hmm, interesting. 1 of mine just says TP4056, the other says TPower TP4056. And the other one says 4056 and under it SN2N1P (which this doesn't pull up much on google; <1page of entries).

*ponders*
 
Wattsup said:
not2bme said:
Wattsup said:
One thing to note with the celllog monitors. I saw a youtube video and read somewhere that they can drain your pack unevenly.
Click to expand...

I'm using the celllog as part of my <$100 BMS system that I'm still tinkering with.

Saw that youtube video too and that guy didn't do any research. He even thinks that it's a balancer (which it is not). The manufacturer is active on the rcgroups and they provided a fix for it. For some reason they designed it to drain from cells 1-6 but not 7-8. So after a while if you are not running a balancer (or especially if you think the celllog is balancing your packs) you will find that cells 7 and 8 will be higher than the others.

The fix is simple, just jumper a connection.
https://www.rcgroups.com/forums/sho...ellLog-and-PowerLog-have-been-released!/page9
Click to expand...
Has the manufacturer corrected this or do you still need to do the fix yourself?
Click to expand...

I just measured the current draw of the cellLog 0,05mA during few minutes, and 0,03mA after the screen went off.
mesured with just 1 cell conected, so 0,03*3,7=0,111mW
So anyone using a bms can just not worry about (my bms for example has 200mA balancing current.)


The confusion about the cellLog doing balancing might come from a cellLog copy named cellmeter8 that claims doing balancing, but i cant find any specs or data sheet for it.
 
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