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  1. sunrise

    Does Battleborn design their BMSes?

    I came across this post https://diysolarforum.com/threads/wow-inside-my-battleborn.27513/ and the picture shows a BMS inside the battery, it's really not that much different from JBD BMSes, same layout . The supplier model number seems to indicate it's a off-shelf unit. I have always thought...
  2. sunrise

    105ah x 2 and 2000w pure sine wave inverter

    Hey folks, Currently I have 2 LiFePo4 banks (105ah x 2, with 2 120a JBD BMSes) in my small camper trailer and it works very well. I am adding a 2000w (continuous) inverter and wondering if it's safe - The cells are rated 1C, so if I trust that it should be fine, but I am worried the...
  3. sunrise

    Can 280/300ah cells reliably drive 2000w pure sine inverter

    Hi all, I am wondering if these 280/300/310ah cells can reliably power a 2000w inverter continuously (> 10 minutes) in a 12v setup? Let's assume BMS can handle this. I plan to build a 4s 12v system in an RV with a Renogy 2000w pure sine wave inverter, and run some high wattage...
  4. sunrise

    2000w inverter with long wire, will it work (safely)?

    I plan to tackle the under powered inverter (1000w) problem, but due to the constraint of available space (I have a 16-foot trailer, space is very limited), the inverter has to be mounted far from the batteries. about 10 feet of cable run. I have read many posts on similar topics. In most...
  5. sunrise

    Need help adding a inverter and ATS

    Hello all, I plan to add a 2000w pure sine wave inverter to my trailer, my goal is slightly different than most popular installation, and here is a rough design, please let me know if you see problem with this design, I know more details are needed, but I just want to make sure I am not...
  6. sunrise

    Re-balance using BMS with low current?

    My DIY batteries are out of balance (I have top balanced using the guide in this forum before I put them in use), one cell hit 3.65v (overvoltage cutoff) while other cells are around 3.36v. during charging I did see [BLANCING] on the cell with higher voltage, but I think the bms passive...
  7. sunrise

    $10 DC-DC charger for charging LiFePo4 via 7pin trailer cable?

    I need a charger that can regulate input current to be under 20A. that's the fuse size in my TV. I just found this cheap boost/step up converter: https://www.aliexpress.com/item/4001136127521.html?spm=a2g0s.9042311.0.0.384e4c4duHH4r5 I also plan to add a relay so I the charging can be turned...
  8. sunrise

    I was banned yesterday and I want to help investigate the root cause.

    Hello, The day before yesterday I received multiple warnings from site mod @Supervstech about I hitting 'report' link, instead of 'reply'. and a few hours later I was banned. I have tried to message @Supervstech but he/she just sent me a screenshot of the page with report and reply links...
  9. sunrise

    Keep cells balanced

    My 105ah x 2 batteries are already installed in my TT. the problem is that they are no longer well balanced, I have one cell at 3.6v and others are at 3.4. the whole bank would not be able to get much above 14v as the 3.6v cell would quickly trigger overvoltage protection. I have top-balanced...
  10. sunrise

    DC-DC charger current limiting

    Hi folks, I recently installed a Victron Orion-Tr 12/12-18 DC-DC smart charger on my travel trailer. it's connected to TV (SUV) via 7pin trailer cable and the fuse in the TV is 20A - that's why I purchased the 18a charger - I do not want the charger to draw too much current that trip the...
  11. sunrise

    Orion Tr Smart 12/12 18A isolated and 7-way trailer connector

    Hello, On my Orion Tr 18A dc-dc smart charger, there 2 separate negative connector on both input and output. I am about to install it on my travel trailer and I need some help with wiring from the 7-way connector - there are 2 10awg wires, white (ground) and black(starter batt/alternator)...
  12. sunrise

    PV disconnect switch, Victron SCC grounding and more

    In my small trailer solar (240w, in parallel) setup, I have a 20A auto-reset thermal breaker and a 32VDC switch between PV and a Victron SmartSolar 100/20 SCC. I want the switch so I can disconnect PV when it's not needed so it doesn't keep my battery at high SOC. I thought this was fairly...
  13. sunrise

    bus bar thermal breakers - necessary?

    Hi folks, In the 12v panel box of my trailer there is this positive bus bar - see the attached picture, it's the copper one on left side. I am wondering what's the purpose of the thermal breakers built into the positive busbar? more specifically, around what temp would they trip? would it be...
  14. sunrise

    Is Renogy DC-DC with MPPT not designed for travel trailers?

    I was pretty excited after watching Will's video on Renogy's DC-DC charger with MPPT. It solves the last issue I had with my trailer solar setup - charging trailer battery with TV starting battery/alternator, and provide isolation. That's until I read the wire sizing requirement. Unlike van...
  15. sunrise

    My Battery Build Experience, Tools and Supplies

    This is a 210ah (105x2) battery I built for my 16-foot trailer. I purchased most of the components prior to discovering this forum, had I read this forum first, I probably would go with 280ah cells, much cheaper and requires just 1 BMS. With that out of the way. I hope my experience would be...
  16. sunrise

    Do you disconnect solar from battery when your RV is not being used?

    Hello, I am wondering if folks disconnect solar charger(or panel) or lithium battery after each use of your trailer (I am not talking about winter storage)? Asking as per this article, keeping LiFePo4 battery at high SOC isn't good for the battery life...
  17. sunrise

    Would connecting 2 batteries in different SOC in parallel cause damage?

    Hi all, I am almost done with my DIY LiFePo4 batteries (105ah x 2), and they will be connected in parallel, the question is, if I connect them in parallel, and if one of them are fully charged and one is fully discharged, would that cause too high of current flow from one to the other and...
  18. sunrise

    4awg lug terminal too big for 4awg wire ?

    I just purchased 10 feet WindNation 4awg red/black wires and 10pcs WindNation copper lug terminals from amazon, But it loosk like the copper wire core diameter is significantly smaller than the lug tube inner diameter. seems like I can push the entire wire with insulating jacket into the tube...
  19. sunrise

    Foldable panel output voltage & MPPT SCC

    I did some search on amazon for an ~100w foldable solar panel, as an addition to roof top rigid panels. I found most of popular/highly rated ones has 'output voltage' of 18v, does anyone know if this is Voc or Vmp? I am wondering how folks use them to charge their trailer lithium batteries...
  20. sunrise

    Is bypass diodes useful in parallel panel setup?

    The NewPowa 75w high efficiency panels I am interested in might or might not come with bypass diodes, but after I read this excellent post https://diysolarforum.com/threads/crazy-diodes-and-not-useful-videos-on-youtube-make-a-diode-video-will.3994/#post-38695 I think in my setup, 75wx3 in...
  21. sunrise

    17v Vmax NewPowa vs 18v Vmax Renogy with Victron MPPT

    Hi, I am working a RV solar application with very limited roof space, the standard 100W panels won't fit. My goal is to have at least 200w panel on the roof so my panel options are as following. (due to AC unit shading, panels will have to be connected in parallel). (Vmax/Voc) 1. Renogy...
  22. sunrise

    Blue prismatic cells(105ah or 280ah) high current discharge test?

    Has anyone discharged these prismatic cells at or close to 1C? I have these 105ah ones and they have very small machine screws on terminal and thin busbars. I am wondering if they are ok to handle 0.5-1c discharge. Wills video only showed about 15A discharge from them. Thanks!
  23. sunrise

    Fuses/breakers with higher current for MPPT CC?

    Hello, I came across this article https://www.doityourselfrv.com/solar-install-5/ Is this a good practice? I mean if the CC is rated 30A, then 35A could potentially harm it, and Solar CC rarely reach full capacity due to the PV operating conditions anyway. Does Victron have over current...
  24. sunrise

    How is MPPT CC itself powered?

    Just curious how is MPPT charger controller like a Victron powered? Is it powered by just PV input? or combination of PV and battery? I mean when there is no or little sun, will it still be able keep the blue tooth running so we can check the status? Thanks
  25. sunrise

    JBD smart BMS displays wrong cell voltage

    Hello, A while ago I watched Will's youtube video on JBD Smart BMS and it looked nice so I purchase 2 of them (12v 4s 120A) from aliexpress https://www.aliexpress.com/item/4000425316662.html?spm=a2g0s.9042311.0.0.27424c4dTRne5e for 2 LiFePo4 banks. After the prep work (crimping...
  26. sunrise

    Loss by mixing different sizes panels with same voltage (vmp)

    Hi, I am a bit lost with mixing panels in parallel. I have read through this article and it makes sense to me: https://solarpanelsvenue.com/mixing-solar-panels/ However when I watched this video The 2 panels are of same voltage(vmp), connected in parallel, I'd expect...
  27. sunrise

    Ripped Off

    A couple of months ago I ordered 8 105ah prismatic cells from aliexpress (BLS), advertised as new 2020 cells. It arrive after long wait for them to be shipped from China. Today I finally got everything (JBD smart BMS, 20A dc charger, lugs, etc) needed to test them. and I was really disappointed...
  28. sunrise

    BMS drained 40% of 105ah battery in 4 hours!

    I am having a bad feeling about this, any advice would be appreciated. A couple of months ago I purchased 8 105ah (the blue aluminum ones recommended by Will) cells from aliexpress. it arrived a couple of weeks ago. I also purchased 2 JBD BMS with BT modules for the cells. Today I received...
  29. sunrise

    Couple of cells in shade of AC unit on RV roof top

    Hi, I am about to install 2-3 Renogy 100W compact panels on roof top of my 16' travel trailer, due to space constraint, panels will be installed by sides of the AC unit. As you can see the top row of PV2 cells could be entirely in AC's shadow if sun shines from the other side of the AC...
  30. sunrise

    Spacing between Aluminum Shell LiFePo4 Cells

    I recently purchase 8 100A cells (those aluminum cells with blue paint). I plan to make 2 12v banks from them with 2 BMS's. I am wondering what would be the optimal spacing for them? is ventilation necessary? Should I put them against each other without any gap? or maybe a 1/4" inch for some...
  31. sunrise

    Aliexpress lifepo4 battery order scam?

    2 weeks ago I ordered $900 worth of battery cells, but tracking information still shows shipping label created, meaning fedex has not received the package yet. ping’d seller and I was told this is expected. I started to have a bad feeling about this. this is from the seller that sells the...
  32. sunrise

    Please Review/Critique My Plan

    I am very new to this, and this is the first version. I am adding a 200W (I might add one more panel if roof space permits) solar system to my 16' travel trailer 2 4s 100A battery banks will be using JBD smart BMSs each. Note I don't want to draw over 100A from them as I think the existing...
  33. sunrise

    Charge wire in 7-way trailer plug and lithium battery

    Hi, There is a 12v 'charge' connector in a 7-way trailer plug, in my trailer it connects directly to the main battery. My understanding is that while driving this will charge the trailer battery while driving. But this only works well for non-lithium batteries I assume? I am worried due to...
  34. sunrise

    Switch to disconnect battery and SCC

    Hi all, In my to be built system (200-300w panels + Victron SCC + 200ah Lithium battery + JBD BMS) I plan to have a disconnect switch for the battery. With that in the off season (long, wet winter in PNW) I can disconnect the battery and leave the battery in storage mode. This switch also...
  35. sunrise

    R/C LiPo/LiFe Charger for LiFePo4 bank?

    I ordered 8 100A cells and BMS for 2 100A banks, plan to use them in a to-be-delivered RV trailer solar project. I need a solution to charge and test these cells without any solar component. I do have this charger and a 1200W PSU (with 12v output) for R/C LiPo batteries, I have also used it...
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