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  • First time DIY case

    I had originally drafted a case design and gave it to a plastic shop to build, but they fell through. Instead, I found plastic cutting boards as a material resource at a local restaurant supply store. They had blue cutting boards :D For this build I felt a bottom would be helpful so I don't drop...
  • Jump starting with LiFePO4

    I was shopping for a jump starter battery for my LR4 so that if the starter battery died, I would have a way out. But it dawned on me that I could physically connect my DIY LiFePO4 to the starter battery via custom Anderson jumper cables. I don't want to break my battery pack and I'm not very...
  • Mounting BMS to case

    The JBD 4S 200A BMS to replace the DOA JK arrived and I noticed there are no mounting holes lol. That makes it hard to mount. The back is a heat sink, so however its mounted that side needs to be out. But when the heat sink is outside then the B- and C- terminals are faced to the case material...
  • JK BMS 4-8S

    I'd like to connect my BMS, but there doesn't seem to be a manual for the device and I'm new. Its the JK BMS 4-8S (12V-24V) - 200A Continuous - 350A Peak - 2A Active Balancing - JK-B2A8S20P It can't be that hard, but I don't read Chinese and I don't know the BMS connections. There is a B- and...
  • 2nd JK BMS dead

    I had the JK 200A 1A BMS working while overlanding but when I got home the BMS won't turn on. I might have disconnected one red wire from the last positive end and reconnected it. Would that kill the entire BMS? I tried disconnecting and reconnecting the wire plugs, pushing the power button...
  • Which charger+inverter?

    I'm looking for help to build a DIY UPS for home that will also be an energy source while overlanding. A generator will be used to recharge the batteries while overlanding. I picked a JK BMS and LIFEPO4 batteries, but they didn't have a charger+inverter or wires for the BMS. For the...
  • Powering a small refer?

    I've been using an ice-chest for a couple years as a full-time overlader and I'm graduating to a portable refer. I run a pure sinewave generator (Yamaha 2200) all day and will use that to power the refer but at night I turn the generator off. Since space is limited (in a car) and so is budget...
  • Drawing power from engine bay

    I have a chevy volt and wanted to use a computer fan in my car powered by the 12V starter battery when the car is off. Since the battery is in the trunk and a PITA to get to, I ran a wire from the engine bay. In the engine bay is a ground bolt and a stud exposed for 12V positive. The same...
  • Battery for jump starting?

    I've been looking for a jump starter to take with my LR4 in case the starter battery dies. The current offerings have more features than I need and are also more money than what I want to pay. The lithiums look interesting, but have big charging limitations. I believe LA or AGM would be better...
  • Sizing battery bank

    I bought the P3 watt meter to measure what I need out of a battery pack. I draw 6 amps at 120V from electronics equipment and would like to supply that for 24 hours from a battery and inverter. I choose Winston brand for the batteries but my constraints are that I need to be able to carry the...
  • Buying 2nd hand sold as new

    In my search for an inverter, I was attracted to Victron and bought their largest 12V unit. Its bigger than I thought but its very portable. Its been putting out 60.1 HZ and its working great, except when I took it out of the box it looked used. It has a paint chip/blemish in the orange stripe...
  • Hertz reading on P3 Kill a Watt

    I noticed the Hz from the P3 meter when plugged into a Victron inverter shows 60.1. When I test my Yamaha generator its a perfect 60.0. Is it normal for the hertz to be off by one tenth or does it matter?
  • Where to put temperature sensors?

    I've got a JK BMS 4-8S and 4 EVE LF304 Grade A Cells. There are temperature sensors with the BMS and I'd like to smash them between the batteries for a good read when I compress the cells together with threaded rod to about 10 ft-lbs. I'm thinking that will break the sensors so how/where do I...
  • Wiring JBD 4S

    I'm looking for some help with a new JBD 4S 200 amp BMS. With a volt meter each cell measures 3.33x volts. The BMS is wired to where the first black 18g lead is on first negative, the first white lead to 1st positive cell, 2nd white lead to 2nd cell positive, 3rd white to 3rd cell positive and...
  • Got the JK 3S-8S 200A 1A today

    I had previously bought a JK but it was used, DOA, missing manual, missing parts and I got ripped off on it. The replacement JK from another vendor arrived today and its working great on first try. The package came with everything and while the device itself was outside the wrapper, it looks a...
  • Direct wiring a phone with a single cell?

    I've got 4 LF304 batteries coming next week, my first ever DIY LiFeP04 and before I even get it now I'm curious about powering an Android phone with a single cell. I have an old LG G6 Android phone and the beauty of it is it runs Android 7 and that is the last version where you can connect an...
  • JBD BMS App and Nominal Capacity

    I'm a newb trying to build a DIY pack. It has a JBD BMS, 4 304AH EVE cells and a Progressive Dynamics 60A charger. When I installed the app, it asked for capacity and I gave it 1216. Then when I go to charge it, the app says its charge load is 59.xA and then it starts dropping rapidly to like...

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