Ohio Powerwall

JustJim

New member
Joined
Jan 6, 2017
Messages
28
View attachment 7

Have opened a lot of packs over the past few weeks. I have enough of the grey Panasonic cells for the full build. Hopefully by using all the same chemistry and manufacturer, things will work better and make balancing less of a challenge. Still a long way to go! That's about 800 cells in the picture.

image_uootel.jpg
 

hbpowerwall

Administrator
Staff member
Joined
Oct 7, 2016
Messages
1,913
I just experienced mangasm... *typing on new keyboard*
 

JustJim

New member
Joined
Jan 6, 2017
Messages
28
My newest acquisition from the local e-cycle warehouse. I plan to mount Powerwall inside. This way, if cells vent or start spewing flames, hopefully the enclosure will keep the mess inside. Of course I had to go with a "Sun" model since this will be solar powered. :)

image_quyjqq.jpg
 

Korishan

Moderator
Staff member
Joined
Jan 7, 2017
Messages
6,445
LOL, but of course! :p
 

daromer

Moderator
Staff member
Joined
Oct 8, 2016
Messages
5,636
Those sun cases are solid :) I have 1/2 left of the 2 i got last year. Nice solid stuff!
 

hbpowerwall

Administrator
Staff member
Joined
Oct 7, 2016
Messages
1,913
Good work !
 

JustJim

New member
Joined
Jan 6, 2017
Messages
28
mike said:
Nice, is that a full sized rack?

Yes. Plenty of room inside. My plan is to mount two shelves in the bottom for my LiFeMgPo batteries and then hang my Powerwall packs at the top. But, I still have a long way to go! :D
 

JustJim

New member
Joined
Jan 6, 2017
Messages
28
Looking for some advice before moving forward....

I have finished charging and testing the Valence LiFeMgPh batteries I picked up at the local recycler and they are all good. My plan is to use those batteries in one 48v bank and then use the 18650 powerwall as a second 48v bank. However, at the rate I'm moving with the powerwall, it's going to be a while! Therefore, I would like to move forward with the Valence bank. Since there are MANY really great minds in here, I'd like to get some opinions of the best way to set things up.

Here is a diagram of how I would like to configure the 20 batteries. My questions are:
1. What size fuses should I install for each of the strings?
2. What diameter cables would be best?
3. Can anyone recommend a good switch that would allow for me to manually select between Bank1 - Bank 2 - Both Banks for feeding the inverter. Note: I will most likely be going with the PIP 4048MS....but I'm open to suggestions!


image_ykczrd.jpg


image_dumdtx.jpg

image_vvgdbi.jpg
 

daromer

Moderator
Staff member
Joined
Oct 8, 2016
Messages
5,636
1. Max cont load on them are 80A. So max fuse size is 80A! Dont go above it if you going to fuse.

They do have built in protection though:
https://www.valence.com/resources/ds-download/

2. Depends. If you only using 1 pip4048 you dont need much.
From the batteries i would go with 16 or 30mm2. From distribution board to switch -> inverter i would go with 30 or 50mm2.

Depends on distances you going to go. But 30mm3 is more than enough for a single pip.


3. Here you have some damn good switches:
http://www.outbackmarine.com.au/power-distribution/battery-switches/manual-battery-switches/
I use: BSS.6007
 

hbpowerwall

Administrator
Staff member
Joined
Oct 7, 2016
Messages
1,913
Have you tested all your cells yet so I can verify your cells on the cell count ?
 

JustJim

New member
Joined
Jan 6, 2017
Messages
28
hbpowerwall said:
Have you tested all your cells yet so I can verify your cells on the cell count ?

All are tested and good, but I just got another 150 laptop batteries to open and process for a couple spare packs to have on-hand.
Would like to begin the actual build process but other work projects have taken priority. I hope to get things moving again soon!
 

egam

Member
Joined
Mar 9, 2017
Messages
109
What battery packs had the gray cells and where did you get them?
Are they new old stock? Or failed batteries from a recycler?
I need ideas to get Good cells cheaper. I have gotten a lot of Junk lately.
 
Top