BM16LP Monitor

Batteries, Chargers, and Battery Management Systems.
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major   10 kW

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BM16LP Monitor

Post by major » Nov 30 2013 5:48pm

Has anybody experience with this? I just got one.
Image
Here is a short first report:

I use the Cell log8s as a comparison. The new thing is a BM16LP. The instructions are here: http://www.chargery.com/doc/Chargery%20 ... 20V3.0.pdf Not too bad for a Chinese product and it appeared to operate and function per the instructions so I won't repeat. It is also available in a BM16LF version for LiFePO4 cells. I have not tested it to the limits on either charge or discharge so I do not know first hand how the alarm works.

All I did was to connect to a 12S LiNCM module (EnerDel) and compare to the CellLog8s and Fluke multimeter measurements. I'll compile those measurements in a spreadsheet and post later. Both the CellLoggers and BM16 had cell voltage deviations of 10, maybe 15 milliVolts from the Fluke readings. The CellLog has a set-up calibration which I never bothered doing; the BM16 has no calibration.

As you can see, the BM16 is a simple circuit board and small screen which is shrink wrapped (in clear as it comes out of the box). The first screen is a multicolor fuel gauge (SOC), not available with CellLog8s. The BM16 comes with 2 temperature sensors, and a plug for the alarm output. Temps appeared to read correctly.

On the 12S EnerDel module I split the monitor leads into 2 separate JST 7 pole plugs. I use one each for 6 channels of the 8 available on the CellLog8s. Using these for the BM16LP, the first 6 cells display as cells 1 thru 6 and the second 6 cells as cells 9 thru 14. Works for me that way and no sparks

I like the plastic case on the CellLog over the shrinkwrap BM16. The CellLog has a data recording capability which I really like and use whereas the BM16 does not.

Nice about the BM16LP is:
Smaller footprint.
You can turn it off with a button push as opposed to unplugging it. I have yet to verify it has no parasitic drain.
Easy to read SOC gauge.
Less costly. (Maybe 20% less delivered than two CellLog8s. I hate to post actual prices on products from others)

I kinda like the little thing and will put it to use and maybe get a couple more. My eTractor would take 2 of these instead of 4 CellLoggers and look a little cleaner on the dashboard and easier to read.
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cwah   10 GW

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Re: BM16LP Monitor

Post by cwah » Nov 30 2013 6:30pm

aren't them super expensive? I'm using celllog because it's way cheaper
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major   10 kW

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Re: BM16LP Monitor

Post by major » Nov 30 2013 7:58pm

cwah wrote:aren't them super expensive? I'm using celllog because it's way cheaper
major wrote: Less costly. (Maybe 20% less delivered than two CellLog8s. I hate to post actual prices on products from others)
See my previous statement (above). I haven't seen a suggested retail price anywhere. I emailed the the place and got a reasonable price.

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Re: BM16LP Monitor

Post by recumbent » Dec 02 2013 3:20am

I like it so far as the demo page you posted. But... if you have a Cycle Analyst like most of us ebikers do, then the SOC , LVC and other parameters are monitored as a whole pack already. The CellLog8 bleeds current from two cells if powered-up and plugged-in all the time, and unbalance the battery packs, so I use them only as a battery checker.

Please let us know how the new "BM16" works in real-life conditions because the two 8 series cells plug is perfect for my set-up. But nervous about bleed current that the CellLog8 has and perhaps this new monitor might also. Thanks for posting.
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major   10 kW

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Re: BM16LP Monitor

Post by major » Dec 02 2013 8:55am

I had some 14S batteries where I used two CellLog8s, 7 cells each. When left connected, cells 7 and 14 would drift higher than the other 12 cells. Investigation indicated the CL drew from cells 1 - 6. There was a fix (hack) but I never did it. I started having problems with the CLs going blank screen or weird when left on too long anyway. So I just resign to disconnecting them when not in use. I heard rumor on other forum that CellLog8 has been changed by manufacturer to even the parasitic drain. Anybody else heard that?

I like the feature where you can turn off the BM16 without unplugging it. I am looking to see if I have a uA meter meter around to measure what it draws. Otherwise I can leave it connected to a battery and track the cell V over a number of days. I don't have a daily use real-life application in the winter around here to give it a test.

Here's a shot of it on my 12S.

Image
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izeman   10 GW

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Re: BM16LP Monitor

Post by izeman » Dec 02 2013 2:05pm

i will never understand that CHINA seems to know only ONE font. ALL of their products use this awful "times new roman" font.
it may not be essential but you buy with your eyes as well, and this looks bad. they have a graphic display - why not use it to produce something GOOD looking :( other than that i thought of buying on before, but as i have 5 celllogs i refrained from spending more money on the very same thing.

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agniusm   10 MW

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Re: BM16LP Monitor

Post by agniusm » Dec 02 2013 2:56pm

Hi. I think it's a grate find. How much were they?

major   10 kW

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Re: BM16LP Monitor

Post by major » Dec 02 2013 2:58pm

I left the BM16LP connected to a 12S battery overnight. I checked on it this morning. GOOD news: The alarm works. BAD news: The alarm was working.

Channel #10 indicated a low cell by about 200mV which was enough deviation to trigger the alarm. The unit had turned its screen off. The unit was beeping fairly loudly and the big LED was flashing quite brightly. I pushed a button and the screen lit up. I could scroll and read cell voltage.

So I proceeded to investigate. Connected CellLoggers. Used different battery. Different wires. Problem is with the BM16LP device as far as I can tell. It follows on channel #10 regardless of the battery or wires. The second battery was balanced to 8mV. Channel #10 still showed way low, about 150mV. And channel #11 reads a tad high, about 50mV. Looks like a problem with the BM16LP.

I sent a report to the source, Jason. We'll see how they handle it. But for now, I'd suggest you hold off on these things.

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agniusm   10 MW

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Re: BM16LP Monitor

Post by agniusm » Dec 02 2013 3:02pm

Unless u can wire it to switch off with ignition.

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izeman   10 GW

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Re: BM16LP Monitor

Post by izeman » Dec 03 2013 5:17am

agniusm wrote:Hi. I think it's a grate find. How much were they?
you can find them for ~$50. not that bad if you think what you get for the price. i wish they would sell it in a plastic hardcase with proper wire ducts and not this flimsy heat shrink.

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agniusm   10 MW

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Re: BM16LP Monitor

Post by agniusm » Dec 03 2013 7:39am

I think they can in aluminium enclosure at least thats whats on their website

vehiculeselectriques   10 mW

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Re: BM16LP Monitor

Post by vehiculeselectriques » Dec 04 2013 9:46am

Hi

I tested a BM16LF on 16 cells pack assembly, cost is arround 50$.
functionnalities as 2 temperature reading, alarms, % SOC gauge etc. make it a very interesting BMS at first glance >>>BUT <<<
unfortunately after testing i found:
the tiny black SOC digital needle is impossible to be seen other than inside house (useless for bike dashboard under sunlight)
and the final "don't loose your time on it as is" for me was when i measured N°16 cell which is always reading about 0,2V too low (compared to cell log and fluke 189)
so i send an email about this problem and some functionnality request (sunlight reading LCD, SOC as a BIG visible bar not a tiny needle, bigger Fonts for using this as dashboard monitor)
to the company seller.... he was very responsive for ordering but ........... had not given any reponse since delivery and faulty unit indications !
not even for taking care of the faulty unit :roll:

So take care about where you put your money in,
50$ for a monitoring device is very good though if it gives some false data indication it's 50$ wasted imho.

whereswally606   100 kW

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Re: BM16LP Monitor

Post by whereswally606 » Dec 05 2013 8:04am

Was wondering whether any of you in the UK wanted to come into a group buy on these. I have contacted the supplier direct and he has sent me a break down.

Hi Andrew,
The quotation is as the following, it is based on FOB Shenzhen.
1, 60USD
5, 55USD
10, 50USD
50, 39USD
100, 32.9USD

on top of this i will add postage to your address but if i have ten orders it might be worth doing. Otherwise ill just buy my own. please PM me if interested.
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izeman   10 GW

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Re: BM16LP Monitor

Post by izeman » Dec 05 2013 8:50am

whereswally606 wrote:Was wondering whether any of you in the UK wanted to come into a group buy on these. I have contacted the supplier direct and he has sent me a break down.

Hi Andrew,
The quotation is as the following, it is based on FOB Shenzhen.
1, 60USD
5, 55USD
10, 50USD
50, 39USD
100, 32.9USD

on top of this i will add postage to your address but if i have ten orders it might be worth doing. Otherwise ill just buy my own. please PM me if interested.
prices are quite high. here you can get the 12s version for €29 - no beepers and leds included though.
http://www.rc-helistuff.at/mttec-lipo-w ... t1813.html
can be important in case you need them. can be quite costly shipping from switzerland. but if someone sells them for €29.- there might be some selling it from europe for €40.- p&p included. so it may not be worth the troubles. of course this is 12s as i said - don't know about 16s pricing.

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Re: BM16LP Monitor

Post by whereswally606 » Dec 07 2013 4:21am

izeman wrote: prices are quite high. here you can get the 12s version for €29 - no beepers and leds included though.
http://www.rc-helistuff.at/mttec-lipo-w ... t1813.html
can be important in case you need them. can be quite costly shipping from switzerland. but if someone sells them for €29.- there might be some selling it from europe for €40.- p&p included. so it may not be worth the troubles. of course this is 12s as i said - don't know about 16s pricing.
I dont agree, for us in the UK having investigated that link the postage would be €22 on top of the €29 so in total €51 which is way more than $60. anyway i take the point on the 16s versus 12s so i have asked the contact for a quote on those too. Hopefully i will not have alienated him with too many awkward questions. any before anyone in the uk want into this bulk buy id like at the very least 5 better 10 units to do the bulk order and make it worth while. this is for a bm16lp still, when i get the first order ill start a thread with names so its completely open. thanks.
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cwah   10 GW

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Re: BM16LP Monitor

Post by cwah » Dec 07 2013 4:40am

can we plug them permanently to cells? and do they have 24s?
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Gregory   100 kW

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Re: BM16LP Monitor

Post by Gregory » Dec 07 2013 5:46am

whereswally606 wrote: I dont agree, for us in the UK having investigated that link the postage would be €22 on top of the €29 so in total €51 which is way more than $60.
Did they specifically say that $60 included shipping?
FOB Shenzhen would normally mean buyer pays shipping.


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major   10 kW

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Re: BM16LP Monitor

Post by major » Dec 07 2013 10:38am

whereswally606 wrote: ... Hopefully i will not have alienated him with too many awkward questions. any before anyone in the uk want into this bulk buy id like at the very least 5 better 10 units to do the bulk order and make it worth while....
So when you speak with the seller ask about warranty and after-sale support. You see in this thread the only two hands-on experiences with the product and both have calibration/quality issues and report of the SOC gauge unreadable in daylight, yet you want to buy a bunch of these. Let us know how that works out for you.

whereswally606   100 kW

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Re: BM16LP Monitor

Post by whereswally606 » Dec 07 2013 12:42pm

yeah I see your point, a bit unnecessarily sarcastic but each to your own. 0.2 volts out is not great but better than no idea of individual voltages.I dont have the luxury of a fluke meter to calibrate but I have got a cell log 8s and 4x bvm8s I would just like it clearly on one screen without unequally draw (such as what you get from an unmodded cell log). This seems to do all that for up to 16s so i figure you pay you money you take your chance. Likely hood is not enough call for it here so ill have to settle for the highest price.
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major   10 kW

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Re: BM16LP Monitor

Post by major » Dec 07 2013 3:03pm

I was serious, with some sarcasm. Please do get one, or more, and let us know how they work. And please inquire about warranty. I'd really like these little buggers to work; I mean work well. Maybe they will address the package, display, calibration, quality and customer service issues or another place will bring a good replacement to market.

whereswally606   100 kW

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Re: BM16LP Monitor

Post by whereswally606 » Dec 10 2013 7:50am

When I double checked with the contact at the chargery. He said shipping to the UK is $25 so in total $85 for one and they dont have any of the 12s ones to sell
Some quick excell magic tells me the cost of the following in a group buy in dollars is

$85 one on its own
$60 each in group buy of 5
$52.5 each in group buy of 10

but i have had no pms about this at all so i will have to wait.
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