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Chris's Build Thread
#81
I get a lot of questions about my powerwall, so here is an overview video: 

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#82
That's a really thorough overview of your powerwall setup! Thank you for posting it!
Check out my long-term capacity test of 18650s: https://secondlifestorage.com/showthread.php?tid=6868
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#83
(08-24-2019, 07:37 PM)whoinow Wrote: Panels are up! Picture from the front was taken early evening, thus the shading.

 


Now that I have 2 solar chargers, my Batrium to Schneider translator needed to control them both. The translator can now support N chargers and will set charging currents from the Batrium (limited, full, etc).


I have also setup influxdb with Grafana to show data from the Batrium, IotaWatt and the Schneider equipment. Pretty happy with the layout and dataset so far.


How much do the surrounding trees/houses impact your solar?
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#84
(11-26-2019, 12:03 AM)Stingy49 Wrote:
(08-24-2019, 07:37 PM)whoinow Wrote: Panels are up! Picture from the front was taken early evening, thus the shading.

 


Now that I have 2 solar chargers, my Batrium to Schneider translator needed to control them both. The translator can now support N chargers and will set charging currents from the Batrium (limited, full, etc).


I have also setup influxdb with Grafana to show data from the Batrium, IotaWatt and the Schneider equipment. Pretty happy with the layout and dataset so far.


How much do the surrounding trees/houses impact your solar?

Right now my production is awful. Its my first winter with the whole setup. The garage array doesn't produce much. I am used to do doing over 30kWh a day, right now I am under 10kWh. Is what it is though.
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#85
(11-25-2019, 02:02 AM)whoinow Wrote: I get a lot of questions about my powerwall, so here is an overview video: 
Great walk-through! Thank you for sharing the video - that was very thorough.
I've also acquired a large number of these cells and have similar plans. I rather like your rod and spacer approach for module construction. 

Wondering if you could share some of your thoughts regarding these cells in parallel. Given their large discharge capability, I've been a bit worried about the potential for cell failure in a parallel string, leading me to consider designs with a per-pouch fuse.  Are you using any in the 25p stacks, or did you consider them unnecessary? If the latter, due to gentle charge/discharge, aggressive monitoring, something else?
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#86
(11-25-2019, 02:02 AM)whoinow Wrote: I get a lot of questions about my powerwall, so here is an overview video: 


Chris, thanks so much for documenting this build, and all the great information. I too am seriously considering these cells for a RV powerwall in my camper. Your build is the best and most informative that I can find with these cells. 

Not to ask for more, but a final writeup or video on how you built the packs, what parts were used and thoughts after using them for a while would be awesome. I am going to copy your pack design for my own 24v setup. 

Thanks again, Great work!
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#87
(02-21-2020, 01:58 PM)Airstream Wrote:
(11-25-2019, 02:02 AM)whoinow Wrote: I get a lot of questions about my powerwall, so here is an overview video: 


Chris, thanks so much for documenting this build, and all the great information. I too am seriously considering these cells for a RV powerwall in my camper. Your build is the best and most informative that I can find with these cells. 

Not to ask for more, but a final writeup or video on how you built the packs, what parts were used and thoughts after using them for a while would be awesome. I am going to copy your pack design for my own 24v setup. 

Thanks again, Great work!
I ended up using the SPIM08 in my RV as well.  Not with the same pack design, but used grommets and threaded rod to put the packs together in a 7S configuration.  I used cheap chinese bms's that have worked well so far in protection.  One of these days I will start a build thread.  I just want to pretty it up first before I post anything about it.  Haha
I do have to say, Chris, this is one of hell of a build.  We are building a setup in my fathers shed right now, and shares some similarities.
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#88
(02-21-2020, 03:28 PM)boostinsteve Wrote:
(02-21-2020, 01:58 PM)Airstream Wrote:
(11-25-2019, 02:02 AM)whoinow Wrote: I get a lot of questions about my powerwall, so here is an overview video: 


Chris, thanks so much for documenting this build, and all the great information. I too am seriously considering these cells for a RV powerwall in my camper. Your build is the best and most informative that I can find with these cells. 

Not to ask for more, but a final writeup or video on how you built the packs, what parts were used and thoughts after using them for a while would be awesome. I am going to copy your pack design for my own 24v setup. 

Thanks again, Great work!
I ended up using the SPIM08 in my RV as well.  Not with the same pack design, but used grommets and threaded rod to put the packs together in a 7S configuration.  I used cheap chinese bms's that have worked well so far in protection.  One of these days I will start a build thread.  I just want to pretty it up first before I post anything about it.  Haha
I do have to say, Chris, this is one of hell of a build.  We are building a setup in my fathers shed right now, and shares some similarities.

Steve you got share! How many are you putting in parallel? Are you on any Facebook groups where it might be easier to share? How many kwh are you shooting for? I am wanting 3-6kwh total. I am a bit scared honestly though that I am going to screw something up and cook my trailer.
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#89
Not part of any groups. I kind of gave up on a lot of social media. I am building mine out in packs. Each pack is 7S6P, and then each pack has its own bms and I am using active balancers on each pack as well. I had some very specific size requirements (dead space that wouldn't be used for anything) is why I did it in individual packs. Right now I have 9 packs, and building 3 more. It will give me 12 packs in all. Each pack would be about 1240WHr's. I am aiming for 15KWHr, so I will be very, very close. I live in my trailer is the reason I wanted more power. Charging it with 4Kw of solar. I am in the process of buying my land, and then I will move everything there. I plan to be off grid for all of my services, and power is the first way around it. I will try and get some pics of it and start a new thread. I am not home right now, so I won't get it for a while.

Honestly, the only way you are going to get it done is just to start doing it. If you don't just jump in, you won't ever do it. You will learn as you go on the specifics, but you need to understand basic electrical theory to make it happen. Think outside the box, and get it done.
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#90
FYI to Chris and any other spim08hp builders: battery hookup is now selling the cases intended to encase each cell https://batteryhookup.com/products/spim08hp-cell-holder for $1/ea

They sold out quickly the first time, but I'm sure they'll be restocked. They also have cells+case
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