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  1. PeteW

    BMS Questions, unsure which brand to use, thoughts on the Victron 12/200 BMS

    I'm building a 12V, 1,120Ah battery bank using 16 280Ah Keheng cells. I've been strongly considering the Over Kill BMS. Mostly because I know very little about BMSs, and the Overkill BMS is recommended by Will and others in the forums. At the same time I began leaning toward the Overkill BMS I...
  2. PeteW

    Testing - Top Balancing Experiment - 4 cells at a time

    No BMS as yet (More on this below.), so I'm doing some top balancing 4, 280Ah cells at a time (As opposed to building 12V batteries and pre-charging). If you see this I'd be interested in your opinions on this. I began doing some top balancing 4 cells at a time yesterday. I only did them for...
  3. PeteW

    Top Balancing (16), 280AH LiFePO4 cells. Please check my Plan.

    Hi folks, I need to top balance (16), 280AH Keheng prismatic cells. The voltages range between 3.29V and 3.28V with only one cell at 3.27V I do not have them yet but I intend to use OverKill BMS. This battery bank will end up in an Airstream Travel trailer. I've been kind of flipping back an...
  4. PeteW

    Wiring Advice Sought

    I'm rebuilding and therefore rewiring a 29' 1992 Excella Classic Airstream. All of my lighting, including running lights, will be 12VDC and it will all be LED. The running lights will be on their own individual circuits for the 7 pin connector. House lighting will be separate and may also be on...
  5. PeteW

    Question about initially charging LiFePO4 cells before top balancing

    I have (16) 3.2 280AH Kehgen prismatic cells. They arrived from china around the end of September or the beginning of October in 2021. At the time they shipped the testing sheet shows that their voltages ranged from 3.290 - 3.293. I tested them when they arrived and there was slight...
  6. PeteW

    Looking For Some Guidance

    Well, it's happened. All of this learn'n about solar has renewed my interest in Electronics and I've been bitten hard. I've been looking at online sources for beginner friendly simulated circuit building and testing and also a welcoming and beginner friendly electronics forum. I've been...
  7. PeteW

    How do I size bus bars for my LiFePO4 280Ah cells?

    I've received my order of (16) 280 Ah LiFePO4 cells, but the bus bars washers and nuts I expected to be with the cells were not. Now I need to order some bus bars and I need to determine the correct size. Naturally, they need to be long enough to fit cell stud to cell stud, but what about...
  8. PeteW

    Airstreamer looking for some advice on mounting to a curved roof

    I own an 29' Airstream travel trailer. I'm adding 8, 100W PV panels to the roof. I'm still waiting (it's been a year now) on a 15K BTU Heat Pump for the roof, as indicated by the blue tape in the second picture. This is a rebuild project, so the shell interior is still unfinished. That means...
  9. PeteW

    SCC Sizing, What is VOC Temp Coefficient and Pmax Temp Coefficient?

    So, I'm just minding my own business trying to learn all I can about installing a decent solar system on our rig when along comes MPPT sizing and kicks my A**. Okay kidding aside, I can't seem to find understandable answers (for me) to this problem. Nate Yarbrough puts in a college try with...
  10. PeteW

    I love the Learning, but, SO Many Questions?

    I have so many questions, where to begin? I’m doing my best to research and learn this stuff on my own, but as I’m sure many of you will agree, it’s a lot to track down and absorb. I'm super thankful for this forum and all of you. A little about me. I’m an older DIYer who loves learning and...
  11. PeteW

    I'm drowning in Alphabet Soup.

    Newbie here. Hello All, I'm completely rebuilding a 29' Airstream trailer, so new electrical system, new everything. I'm trying to learn from the wisdom and experience of others in this forum, but I'm drowning in Alphabet Soup. Is there a place to look up the meaning for all of the...
  12. PeteW

    Stuck In Solar Limbo

    Hello Out there, So here's the thing. I'm a DIY solar newbie with some book and internet learn'n. I've done quite a bit of reading and youtube research (including Will's book), but I'm kind of stuck. Well, "Paralyzed" is probably a more accurate description. I'm also worried about all of the...
  13. PeteW

    Greetings from Virginia Beach, Virginia

    Greetings From Virginia Beach, VA. My wife and are rebuilding and Airstream and want to add a robust 12V solar system including LiFePo4 batteries. I'm not new, new to solar, but I'm not super knowledgeable either. Recently, I've been watching Will's videos and I've read his book. I love...
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