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Hi all, A few months ago I made a post about my 3D printed battery design based on EVE 304ah cells. The project was completed a month ago but I have been very busy with work since then. I just managed to find some time to push the design to Github...

OK, just finished designing of this battery case, I named it '300', as it's 300ah and fairly spartan :) Waiting for a couple of components to arrive before I kick off printing. If all works well, I will put the design on github. Wish me luck :) Cells: EVE 304ah BMS: JBD 200A

The 304ah cells and BMS both arrived so I will start to assemble my 2nd LiFePo4 battery soon. One question - where should I place the temp sensor? After watching Will's battery review videos seems making them in direct contact with the cells is not recommended? One year ago I built a 105ah...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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)...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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!

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...

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

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...

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...

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...

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...

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...

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...

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...

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...