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The Outhouse Powerwall
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Thought I'd post my build even though it won't really be ready until this summer. But I figured I'd start posting my progress! Can't remember how I got started, but it was around mid-Oct and looking at Tesla powerwalls, and probably stumbled on hbpowerwall's youtube. My plan is to build an outhouse in the back and house all the batteries in it. My solar panels will be a ground mount but is basically laying on the lawn at the moment. By the summer I'll have the outhouse built and the solar panels mounted.

So far I've managed to build my first 7s60p pack. Here's what I'm using:
  • PIP2424LV from MPPSolar ($550)
  • 9x 245W used solar panels ($50/ea)
  • 420 cells, roughly 3kwh of LG batteries mostly from alarmhookup to speed up the process (roughly $550)
  • Celllog 8M for BMS ($20)
  • 1S balancers (2x) to manually balance as needed. ($40)
My cells are arranged at 60p just because of the batteries I had at hand, but it seems the right way. I followed owitte's build in a way that I like to be able to increase the pack size as necessary by just adding more cells. But then I wanted a denser configuration, so instead I choose a rack style. I also brought both ends of the terminals up front, bringing one of the bus bars on the rear to the front. This allows me to front load the packs and not worry about anything in the back. Right now there's only one layer, but I am imagining at least two or three layers, with a copper bus bar running down each pack, so basically turning a 60p configuration into a 120p or 180p if need be.

Each layer of 7s60p is roughly 3kwh so I am planning to get to at least 12kwh by summer. My progress with the PIP2424LV so far is pretty abysmal. Partly to blame is the poor mounting of the solar panels, or lack thereof. Then there's the winter hours where I spend at least 18 hours on batteries. Combine that with that the PIP takes roughly 1200w to run, giving me roughly 2kwh of power out of my pack. So out of the 3kwh pack, I can barely run 100w continuously. I started with 6x panels, and I just threw another 3x panels this weekend, and it helped extend the running time during early and late day. Extending to 6kwh I expect to have most of these issues to go away as it allows me to be able to buffer at least one day of crappy weather.

I'm using a Celllog 8M as the BMS, and I'm planning on hooking it up to the ABB shunt trip breaker maybe next weekend. I calibrated it to match my multimeter and it seems to do a good job. I'm also using 2 1S balancers like owittes but I only hook up when I need to. Early on Pack 3 had an issue and it kept going out of sync, so the balancer seemed to balance it out pretty well. It balances at around 300ma at 100mv difference and increases with more differential. Then later I found the issue, I forgot to solder two fuses to the bar, so the pack was short 4 cells. After that it was fine.
Wattsup, Kenbat, Korishan And 7 others like this post


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The Outhouse Powerwall - by not2bme - 12-26-2017, 05:20 AM
RE: The Outhouse Powerwall - by wim - 12-26-2017, 07:49 AM
RE: The Outhouse Powerwall - by Stefaan De Ridder - 12-26-2017, 09:03 AM
RE: The Outhouse Powerwall - by Korishan - 12-26-2017, 01:43 PM
RE: The Outhouse Powerwall - by not2bme - 12-26-2017, 02:13 PM
RE: The Outhouse Powerwall - by Wattsup - 12-26-2017, 08:04 PM
RE: The Outhouse Powerwall - by wim - 12-26-2017, 08:09 PM
RE: The Outhouse Powerwall - by not2bme - 01-07-2018, 10:25 PM
RE: The Outhouse Powerwall - by not2bme - 01-20-2018, 04:29 AM
RE: The Outhouse Powerwall - by not2bme - 08-01-2018, 02:57 AM
RE: The Outhouse Powerwall - by rodagaster - 08-01-2018, 08:29 AM
RE: The Outhouse Powerwall - by not2bme - 08-01-2018, 02:13 PM
RE: The Outhouse Powerwall - by Walde - 08-01-2018, 08:18 PM
RE: The Outhouse Powerwall - by not2bme - 08-02-2018, 01:05 AM
RE: The Outhouse Powerwall - by not2bme - 08-11-2018, 08:56 PM
RE: The Outhouse Powerwall - by jesusangel - 08-12-2018, 06:25 AM
RE: The Outhouse Powerwall - by not2bme - 08-12-2018, 11:22 AM
RE: The Outhouse Powerwall - by jesusangel - 08-12-2018, 11:44 AM
RE: The Outhouse Powerwall - by Redpacket - 08-12-2018, 01:36 AM
RE: The Outhouse Powerwall - by Korishan - 08-12-2018, 12:11 PM
RE: The Outhouse Powerwall - by not2bme - 08-12-2018, 03:24 PM
RE: The Outhouse Powerwall - by Korishan - 08-12-2018, 04:38 PM
RE: The Outhouse Powerwall - by not2bme - 08-19-2018, 07:47 PM
RE: The Outhouse Powerwall - by not2bme - 09-04-2018, 11:24 PM
RE: The Outhouse Powerwall - by jdeadman - 09-05-2018, 12:26 AM
RE: The Outhouse Powerwall - by not2bme - 09-05-2018, 02:21 PM
RE: The Outhouse Powerwall - by jdeadman - 09-05-2018, 03:18 PM
RE: The Outhouse Powerwall - by hbpowerwall - 09-06-2018, 03:15 AM
RE: The Outhouse Powerwall - by not2bme - 09-06-2018, 11:26 PM
RE: The Outhouse Powerwall - by hbpowerwall - 09-07-2018, 02:22 AM
RE: The Outhouse Powerwall - by not2bme - 10-08-2018, 05:45 PM
RE: The Outhouse Powerwall - by not2bme - 10-12-2018, 11:28 PM
RE: The Outhouse Powerwall - by Haslero - 10-13-2018, 12:38 PM
RE: The Outhouse Powerwall - by pflicht - 10-20-2018, 03:36 AM
RE: The Outhouse Powerwall - by not2bme - 10-25-2018, 11:10 PM
RE: The Outhouse Powerwall - by not2bme - 11-11-2018, 09:22 PM
RE: The Outhouse Powerwall - by not2bme - 02-02-2019, 10:01 PM
RE: The Outhouse Powerwall - by mike - 02-03-2019, 06:28 PM
RE: The Outhouse Powerwall - by not2bme - 02-04-2019, 09:25 PM
RE: The Outhouse Powerwall - by not2bme - 03-01-2019, 12:16 AM
RE: The Outhouse Powerwall - by kanchana - 04-17-2019, 04:12 PM
RE: The Outhouse Powerwall - by not2bme - 04-18-2019, 01:25 AM
RE: The Outhouse Powerwall - by kanchana - 04-20-2019, 02:15 AM
RE: The Outhouse Powerwall - by not2bme - 04-30-2019, 02:37 AM
RE: The Outhouse Powerwall - by not2bme - 05-06-2019, 04:01 AM

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