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LG ESS 189AH 48V 9.8kwh from BatteryHookup
#1
Hi All,

Newbie and first time poster here.  I know a bunch of the LG ESS 189AH 48V batteries were sold, but I haven't seen many people posted about them.  I know w0ss on this forum is working on one.     Has anyone had luck communicating with the LG BMS?   How are these batteires being deployed, please share!.

My plan:

Fully Off Grid system in my garage for charging my 30kwh Nissan Leaf (just bought a 2016 SL with 37k miles and 85% battery capacity for 11k.  Great deal in my book.  I just use primarily for intercity commuting.)

I can fit up to 12 - 60 cell panels on the roof of my garage.      So figuring 300watt panels I can have up to a 3.6kw array.   

The LG ESS is 9.8 kwh nominal.         I would like to charge my leaf during the day when sun is out when possible from panels, but I get home when it is dark most days, so will have to charge the leaf off of the LG battery.

The MPP inverter/chargers look pretty good for this application.     I can charge LEAF at 110v or 220v, I guess 220 would be ideal for speed but 110 would preserve Leaf batteries longer.   

Questions:

1) Best way to connect LG ESS to BMS and then to inverter/charger.
2) Best inverter/charger setup for this application.
3) If grid ever does go down in my house I would run extension cord from garage to plug in critical load such as my refrigerator. 
4) Other things I should consider?

Thanks all!
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#2
Hey,
Just saw this post. Let me give you my thoughts.

The "BMS" is not really a BMS. It looks like it has some bleeding resisters and monitoring circuitry but no way to stop current. It probably had a management board that talked to all the separate battery modules. I didn't spend much time trying to talk to it but if it's like other LG battery systems it probably just uses CAN.

I am using Batrium with the 2 modules I have. Just ordered the MM8. Right now the cells are paralleled via the BMS leads via a custom board I designed(so I have fusing between cells)

The Sunny Island were going for pretty cheap a few months ago so I used that. I never had any issues with the MPP inverters and I think many use them as well.

I had the same issue with finding info on what people were doing with these modules. Not sure how many they sold but maybe they didn't have many.
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#3
(04-08-2020, 03:56 PM)Can you describe the batrium setup you are using. I am about to buy an LG and am trying to figure how I am going to apply a bms to this system., The LG is set up like the Valence in that they have an information system set up on each module locally and use an external bms to monitor/control several systems. I have two sunny islands - how did you connect - did you use their Li-on connection directly?thanks Evan Wrote: Hey,
Just saw this post. Let me give you my thoughts.

The "BMS" is not really a BMS. It looks like it has some bleeding resisters and monitoring circuitry but no way to stop current. It probably had a management board that talked to all the separate battery modules. I didn't spend much time trying to talk to it but if it's like other LG battery systems it probably just uses CAN.

I am using Batrium with the 2 modules I have. Just ordered the MM8. Right now the cells are paralleled via the BMS leads via a custom board I designed(so I have fusing between cells)

The Sunny Island were going for pretty cheap a few months ago so I used that. I never had any issues with the MPP inverters and I think many use them as well.

I had the same issue with finding info on what people were doing with these modules. Not sure how many they sold but maybe they didn't have many.
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#4
I have a batrium watchmon5 connected to both modules. I connected them in parallel. I bought a multimon8 and am just waiting to get it. Once I do then each will have their own board.

I used the Canbus connection on the Batrium connected to my sunny islands. The sunny island is setup to slave off the Batrium. I am also using the SoC feature on the Sunny Island. If it gets below 20% SoC it switches back to grid and charges.
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#5
(04-21-2020, 06:17 PM)w0ss Wrote: I have a batrium watchmon5 connected to both modules. I connected them in parallel. I bought a multimon8 and am just waiting to get it. Once I do then each will have their own board.

I used the Canbus connection on the Batrium connected to my sunny islands. The sunny island is setup to slave off the Batrium. I am also using the SoC feature on the Sunny Island. If it gets below 20% SoC it switches back to grid and charges.
Sorry for many questions:
I am basically a solar/batterytech newbie

Did you wire your own canbus cable.. per batriums published instructions?

what settings permitted sunny slaving to batrium ?

thanks

evan
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#6
Yes Batrium has a great document on cabling it to the sunny island. I followed it and had no issues. When you first power on the Sunny Island and configure the Battery you select LiIon_Ext-BMS and it automatically syncs to the batrium.
evangarber likes this post
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#7
There are 24 leads on the battery. Did you map out the 15 ..1 neg and 14 positives. I am curious what the other 9 do. Wonder if some are temperature sensors. If you mapped the bms leads it would be of great help to the 60 or so new users of these batteries.

Batrium is telling me to get the watchman 5.. so i am about to order.

Thanks for the info, I wish I had ordered two but got there too,late. It will be 6 months before another set appear at battery hookup.
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#8
check out my build thread. i only mapped out the voltage sense leads. its setup like 2x 7s into the monitoring board.
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#9
(04-22-2020, 12:00 PM)w0ss Wrote: check out my build thread. i only mapped out the voltage sense leads. its setup like 2x 7s into the monitoring board.

Hello again:

I assembled the breakout board you designed and have your photo of he leads in to thboard. I just received my watchmon 5.

There are a total of 15 leads going into the breakout board. You skipped number 8 and proceed to use 4 of the connectors on the rear connector for a total of 15 leads going in. If you wire this to the  Watchmon 5  as a 14s, you are instructed to insert a single jumper at position jc1. 


Some questions I hope you can answer before i attempt to wire this guy.


1. Is this actually being wired as a 15s - meaning all of the 15 of the leads you have on the breakout board connect to the 15 positions on the high and low boards (thereby requiring no jumper)?

2. When I measured the voltage of each of the leads after connecting the board to the LG yoke, the first lead on teh left of the lower jumper was high (+52.5V)  and it progressed downward with voltage at about 3.7v per jumper - except for 4 and 5 which read the same and 8 and 9 which read the same... this continued onto the 4 leads on the back connector. IS there something I am supposed to do different with the positions 4 and  which read the same voltage? I am skipping 8 as you have done.
   

Thanks in advance for clarification.



Evan
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