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I'm ready to wire up my battery packs with JK BMSs and have a logistical question on most effective and easy way to do it. The battery packs were EV modules with each 6s13p unit having it's own onboard BMS. I removed the control boards but left the wiring harnesses on for now because I wondering...

I'm trying to finalize documents to submit for a permit in my city (Hayward, CA) but am trying to figure out what exactly I need to include when it comes to disconnects and stuff. I am NOT interested in a grid-tie system but simply want to reduce my grid consumption by eliminating EV charger and...

2'x4' Shelving Unit Just bought one myself!

Trying to figure out the best shelving system for my DIY ESS. I've seen plenty of metal racks and server racks and wooden racks. Metal would want to be grounded. Wood catches fire easier. Is one substantially more safe/better than the other?

Finally have compiled all the necessary parts to begin install of my PV + ESS system. Added rooftop solar to my homeowners insurance policy ($20/yr) and getting ready to submit for a permit. Permit application requires "cut sheets for each product and install according to the manufacture’s...

Decided to take a peek on eBay to see if I could find a deal on this final part to my PV setup -- and found a great one! Class T 300a Fuse + Block

As posted in other threads I've got a total of 10 415w 48v QCells panels I'm going to integrate into my (2) LV6548 + ESS setup. In previous posts (thanks to tons of helpful replies) it's pretty clear I'm either going to go with 4S2P with a string into each inverter or 3S3P with a couple strings...

New to the solar game and cleaning out a bunch of old components from coffee roaster builds from a few years back. I have a bunch of Solid State Relays (40-50a 240VAC) and contactors rated to similar amperage and voltage. I also have a handful of DIN Rail Mount Breakers that I'm pretty sure are...

Just bought (2) of these from this seller. They are FEEO not Aims like the one on the left in the photo. $67 shipped. Brand new in box. Pretty good deal from what I was looking around at. PV Disconnect

I'm hoping to make the final couple of purchases of equipment to get my system installed. I'm down to fuses, cables\wiring, and disconnects. I have been reading through different build threads and there seem to be a ton of OV disconnect options and I really would love some advice on which one(s)...

JK BMS If you're looking to snag a JK BMS for only $108 from a known (reliable) seller of these on AliExpress check out the link above. It's a promotion that only allows you to purchase one at a time. I just bought 4 via separate transactions. Not sure if they will catch that or shut it down...

I know the forum is going ??? over the release of the EG4 6000xp right now so I'll add to the cacophany! I have been slowly assembling components for a 48v battery system. A while ago I snatched up a couple of LV6548s from Current Connected that were overstock (unreturnable). I was about to...

Anyone ever purchased from this company? Looks too good to be true $45 JK BMS? JK BMS

I'm having a hard time determining which BMS will be the best option for these battery packs I just purchased and plan to configure into 16s 48v banks. Of course, I was encouraged by Will's video a while ago offering high praise for Overkill but 100ah is max. I'm also considering a 200a JK BMS...

My battery modules have arrived and I am preparing to (trying to at least) get the rest of the initial components necessary for my 48v bank. I'll have a total of (4) 48v battery banks and understand that best practice would be to have a separate BMS for each one. I have been looking at getting a...

In preparation of submitting a permit application for the PV system I'm constructing I will need a rapid shutdown switch of some kind -OR- "IF ANOTHER MEANS OF RAPID SHUTDOWN IS NOT PRESENT, PROVIDE A ROOFTOP DC DISCONNECT * @ ROOF WITHIN 3’ OF PV ARRAY ALONG ACCESS PATHWAY PER HAYWARD FIRE...

I'm finishing the planning of my PV build and one thing I am unsure about is roof strength to handle the weight of my panels. I would like to install 10 400w panels on my carport/garage roof @ 55lbs each. The house was built in 1927 with old growth redwood. The rafters are actual 2x4s (measuring...

I'm sure the answer to this is obvious but I haven't found an answer here for it yet so I'll ask anyway. Many repurposed battery modules have on board BMS such as those pulled from EVs or other applications. My question is why can't we use those already installed and compatible BMS with a DIY...

Been saving this in my cart for when my PV build was more immanent (which it is now) and right now on Amazon there is a $13 off coupon and 10% off promo. Dropped the brand new price down $20+ KAIWEETS HT208D Inrush Clamp Meter

I'm about to place an order for the initial supplies to build my first DIY batter bank. My goal is to build two banks of 16s 48v packs to hit a goal of ~29kWh (connected to (2) LV6548s (32) Envision Grade B 305ah Cells (2) JK-BMS 200A Continuous/350a Peak - 2A active balancing Zketech EBC-A40L...

I'm going to luck out and be able to install my (10) 400w panels in a single series along my carport/garage roof. It's the max sunlight/day and can drop right through the roof to my (2) LV6548's and future battery bank. Probably a dumb question as a beginner but since I'm installing in a...

Found this seller on eBay with some "lightly" used CALB cells ( here ). I have read boatloads of posts about Grade A vs B, new vs used, EVE vs. CALB vs. CATL vs. ???, etc. I will be traveling down by their area this weekend and they offered to sell me either 32 or 48 cells at $48/ea for my DIY...

I came across a potential good deal on some EG4 LL Server rack batteries. They're 48v 100ah. I've also been very tempted lately to go the DIY route and build a 2x system for the same price using 304ah cells in a 16s setup. Obviously, the build out, BMS,etc is a determining factor but is the...

I'm finalizing my battery solution before setting up and installing my PV system at my house. I live in the SF Bay Area (Hayward) and they have a streamlined self-permit option for residential solar installs. I downloaded the application with all the info and it... well it seems too simple and...

I'm having a hard time finding a diagram that meets what I think I want/need for the system I'm building out. Essentially, I am looking to charge a battery bank using PV and use energy stored in the bank first and once that is drained for the AC from the grid to kick in. I am in CA and not...

I'm not sure if this is being posted in the correct forum so if mods need to move it I apologize. I am in process of installing (3) EG4 mini-splits (1 12kBTU and 2 9kBTU) to eventually be run by my PV system. For now, we have no HVAC in our house so this will solve that particular issue. I went...

I've been wavering between purchasing server rack batteries or going the DIY route. Yesterday I was casually searching up cells on CL in my area and came across what seems to be a stellar deal on (44) CATL 280Ah LiFePo4 Cells manufactured in Fall of 2022. The seller has these leftover from an...

Any particular feedback about BatteryEVO and their cells? I found this listing for some 48v cells on sale (listed as Grade B but 95% capacity). Have found reviews of bad suppliers of their cells but not of the cells themselves. Thanks in advance! BatteryEVO 48v 70ah Grade B Cells

LG 51.8v 252ah 14kWh Creepin around eBay for a battery deal and came across these refurbished LG power wall units. Obviously, I'm familiar with LG as a company but don't hear much about their solar/battery offerings. At $0.19/kWh seems like a decent deal based on what I've been reading. If...

I am slowly purchasing equipment in order to build out an off grid system for my house. We just moved to CA and missed out on NEMA 2. So far I've purchased these as the main components for my system: (10) 48v 415W Q.PEAK DUO L-G6.3 / BGT 415 [ used panels ] (2) LV6548 MPPTs As I think about...

Hi Everyone -- first post on the forum after many hours of researching, watching videos about off-grid setups, and combing the internet for deals to make our solar dreams a reality on a limited budget. I'm new to the solar world and was able to snag some QCells 480w 48v panels for $50/piece in...