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Which bms to use
#11
I use those bluetooth BMS boards... I have one in 7s and 15s 

That said, for my 15s setup which is for my EV packs, I only really use it for monitoring.  The packs are too big for the BMS to provide any balancing and the packs will far exceed the currency handling of the BMS as well.  Most of my large intermittent loads are connected directly to the batteries though a LVD, and small persistent loads which are always on are connected though the BMS.

Its not perfect, but it works for me, and its cheap.



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#12
Crimp I want one that I can just read the cell voltages in a screen so I don’t have to use Bluetooth due to bluetooths distance not being far enough so I’ll just go to the battery to check the cells voltage.. something like this one in the pic but I’m trying to find one for 16s.. the ev module I am getting has the male plug to connect to the battery then has all the wires there to monitor each cell.

I guess I could use one of those cheap bms like u use for your 15s pack.. problem is why have the bms with Bluetooth if I have to be right up the batteries ass anyways for the Bluetooth to connect.. also do the chinese bms connect to ios, I see it says android.. Ik most things can use both.
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#13
You don't need one that can do 16s, you need two that can 8s, or 3 that can do 6s

I would buy the ISDT BattGo I have in the photo I posted. Its a nice unit.
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#14
your saying get 2 battgos that each read 8s.. I wasn’t going to leave them plugged in all the time.. I’ve read they are generally not supposed to stay installed, that they are more for testing.. so I guess I could just get 1 of the battgos and split my 16 cell wires into two 8s connectors.. do they not make one that I can just plug up the same way but with a 16s connector so I can read them all at once..

Which Lvd would I use that can be adjusted to roughly 58v?
If I knew those Chinese bms could be configured using IOS I would just get one of those, due to them having the LVD and viewing of all 16 cells at once. If I had to Bluetooth my pc to set parameters I’d be ok with that as long as I only had to do it once in the beginning
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#15
I’m not really trying to tell you what to use.  I was primarily responding to your comment about trying to find a 16s cell monitor as you posted a picture to the HobbyKing Cell Medic unit which has a screen but only does 6s.  The point I was trying to make is you don’t need to find a 16s unit because they don’t really exist in that cell monitor format.  You can simply get two 8s cell monitors and accomplish the same thing.

I don’t see the harm in leaving them plugged in all the time either, at least not on large packs like these.  My BattGo unit spends a ton of time attached to my system for monitoring, at least until I need to use them somewhere else for testing. 

Yes, you can and should split up the JST balance leads into two 8s connectors.  That said, why stop at one BattGo or similar?  Moving them from 1 connector to the other sounds pretty lame.  Get 2 and see all 16 cells at once.  I bet it still cost less than some other solutions you might want to consider including that Bluetooth BMS board I like.  At least you get your local screen without need for an Android device, from what I understood this is what you were trying to do in the first place.

For a LVD I would use the Victron BMV-712 Smart battery SoC monitor and the Victron battery protect unit, contactor, or something similar which is rating for the application.
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#16
I want u to tell me crimp.. lol u know more about all this for sure.. thx for letting me know they don’t make a 16s monitor.. I will get a few of the ISDT units to not have to disconnect-where out the connectors.

Yeah I guess u correct about letting them stay connected to a bigger battery, they said on the site not to due to draining battery but that’s probably for smaller packs..

So for the Lvd I could use my charge controllers aux to set off a contactor when battery voltage is to low? My inverter already has a low voltage disconnect aswell.. although it doesn’t actually disconnect
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#17
(10-09-2019, 12:11 AM)Doin it Wrote: I want u to tell me crimp.. lol u know more about all this for sure.. thx for letting me know they don’t make a 16s monitor.. I will get a few of the ISDT units to not have to disconnect-where out the connectors.

Yeah I guess u correct about letting them stay connected to a bigger battery, they said on the site not to due to draining battery but that’s probably for smaller packs..

So for the Lvd I could use my charge controllers aux to set off a contactor when battery voltage is to low? My inverter already has a low voltage disconnect aswell.. although it doesn’t actually disconnect
I don't think you can program the aux relay in an outback MX/FM controller to act as a low voltage disconnect, from memory.
Current system: 9.6kWh wet Nicad batteries, 16S1P Calb LiFePo4 210aH, Batrium WM4, Outback vfx3048 inverter, mx60 mppt controller, flexware 500 mounting hardware, 2.4kW solar array, 6kW lister diesel genset. MY'13 Vauxhall Ampera
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#18
The low voltage disconnect should be connected between the battery bank and the load(s) to protect the battery from over-discharge. There could be multiple ways to do this depending on what you are trying to accomplish…

Dumb loads like lighting would need a LVD, but if you can set your inverter to cut-off at a specific voltage, that may be sufficient if it’s the only load and had a low idle current.

The smaller Victron MPPT controllers with a load output have a programable LVD, unfortunately the larger ones don’t, but the communication port can be used to control the battery protect units from what I understand. This ultimately save you the cost of the BMV monitoring unit in my previous recommendation. I have a Victron 75/15 and I find it to be a very useful feature.

As far as monitoring… I didn’t want to make a blanket statement about cell monitors, but it would be rare, very rare to find anything larger than 10s. At least in those little convenient plug and play models.
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