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My Build
#1
Music 
Well I've been sitting back and taking in all the info available here and its time to introduce myself and share my progress.
My name is Garry.  I am building a 48V system to eventually suppement the load on my house. I have 10k Solar Install to start in a week or so (awaiting final permits).  Solar Edge with 37 280watt panels an no Storage.  The cost was too much for my pocket.  So I decided to add my own and that is how I found you guys.

Because my solar install is being professionally done there are some limitations on what type of Storage I can add to the system.  I was told Solar edge will only permit Tesla or LG brand batteries to be hooked to it.  So I am having them install 3 extra panels totally isolated from the main system.  I will use this setup to perfect my Powerwall and satify my curiosity to Do It Myself.  My hopes is that the restrictions will be lifted an I ca n add my batteries to the main system.  Untill then I will be powering my Garage.

Although most of the Packs see here are all straight parallel I decided to do my packs as 14s 11p or 14s 16p.  This is proving to be very complicated and expensive but I am determined to overcome these challenges.

My Powerwall will be mounted inside Server Cabinets in my Garage
PCM60X Charge Controller
AIMS 2000W Inverter




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#2
Welcome, I fixed your post for you Smile
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#3
(10-11-2017, 02:51 AM)hbpowerwall Wrote: Welcome, I fixed your post for you Smile

Thanks !!!
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#4
Looks Great!!! I really like those server Cabinets!!!
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#5
Thanks Joe!!!

Just curious, is anyone in the community building their packs to meet their actual end voltage?  I would love to see how they addressed some of the issues I am facing.  I initially modeled my pack from Daniels video.  https://www.youtube.com/watch?v=8Xv8B93EoH0&t=14s
1.  BMS Issue -  Mounting Longmons will now require 14 of them for 1 pack.  :-(  Is it possible or feasible to use only 7 longmons by attaching across series string?
2.  Many of the strings are in the middle of the pack and longmons will not have physical contact for Thermal.  I left the space around the edges to help affix Longmons.  Remember my pack will be sitting on a shelf.

The picture below shows Daniels Pack (Pack1)   and my alternative pack (Pack 2).  Pack 2 has no strings internal to the pack.  I can affix a longmon to every parallel cluster.  I have other issues but lets chew on this one for a min.  I would love to get some input.

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#6
If you want full BMS control and monitoring, you'll need one for each series string. So for 48V pack, you'll need 14 of them per pack. However, depending on how you design your packs, you could only use 14 and each successive pack is just directly paralleled to the first pack. Each of the 14 strings are connected to the 14 strings of the next pack.

And for me, yes, I'll be designing my packs to meet voltage requirements. But I'm going to build my own BMS setup. Currently I'm thinking of basing it off of the BQ76940 by TI.

Curious, why did you put all that tape on the one pack?
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#7
(10-13-2017, 11:49 PM)Korishan Wrote: If you want full BMS control and monitoring, you'll need one for each series string. So for 48V pack, you'll need 14 of them per pack.  However, depending on how you design your packs, you could only use 14 and each successive pack is just directly paralleled to the first pack. Each of the 14 strings are connected to the 14 strings of the next pack.

And for me, yes, I'll be designing my packs to meet voltage requirements. But I'm going to build my own BMS setup. Currently I'm thinking of basing it off of the BQ76940 by TI.

Curious, why did you put all that tape on the one pack?
Ok I get it.  This will require some custom wiring.  As for the tape I did it just for safety as I move it around a bit and didn't want all those hot contacts exposed.  I am building the packs in by trailer and it get quite hot during the day so I bring them in the house.

Thanks for the alternate hook up of the BMS.
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#8
(10-10-2017, 09:18 PM)Rahtid27 Wrote: My Powerwall will be mounted inside Server Cabinets in my Garage


Brilliant
    later floyd
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#9
I can fit 4 - 48V Packs per shelf. 168 x 4 = 672 cells At 2000ah I calculate 5kw per shelf
My goal to start will be 10kw. So 2 shelves. (Lets see how that goes) :-)
I am terminating each pack with an XT90 connector.
Each will plug into conduit running directly in front of the shelf.
Here is where things get fuzzy and need some expert advice/opinions.
How to combine all the connections from each pack so I end up with 1 pos 1 neg?
I came across an interesting Combiner box on ebay and curious to hear what you guys think.
I know its pricey but it has some kind of monitoring functions that might be nice to have.
Not sure how it works but at the very least it will keep things Nice and tidy. Right Pete :-)
Is this feasible? If not how would you do it?

http://www.ebay.com/itm/Energy-Recommerc...XQjq5Q~uxX
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#10
You can run a 15wire interconnect between each pack and then just run 14 longmons on a board hooked up to them. You dont get any temperature monitoring of the packs as such but on other hand when the board balance they get hot anyways.

Its a little bit tricky to run it with long mons but it do work. You dont need very thick wires between the pack either since it only will hold balance current.
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