not2bme
Member
- Joined
- Oct 16, 2017
- Messages
- 517
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:
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.
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)
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.