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It's a JK b2a8s20p - I didn't cheap out, but did get a pretty good deal on Cyber Monday. Seems highly regarded, and I'm pretty sure the off grid garage fellow tested it and confirmed it's a real 2A discharge current. Anyhow, sounds like I've found my combination, thanks again for all your...

Thanks. Slow charging from this converter is fine - most renters run from campground to campground (and often stay for 2-5+ days on shore power anyways) so getting charged super fast isn't a high priority - just having it simple "plug and go" is. And renters aren't using the inverter and...

@upnorthandpersonal I see while I was replying to this thread you were busy replying to my other request in the other thread - you're awesome! I'll sort through the new versions you just posted (I just refreshed the page on your server and boom, they're all there) and work my way up until I...

I'll wait first and see if anybody else reports having the same issue before deciding to narrow it down to being a device level thing versus an App level thing. ;)

Frig. Glad I turned off auto-update. Someone let me know when they've fixed this please lol.

Sorry, should have mentioned, it has a high end BMS, so I just need a supply. It's a 4s pack.

So far as I can tell you're not missing out on anything, aside from the settings page being broken I detect absolutely no difference in the app itself.

Hey all! I'll try to get what I'm hoping to accomplish across here without writing a novel. But it'll probably be a novel, I'm overly thorough LOL. I'm looking to build a DIY 200AH Lifepo4 system for our tiny camper. We travel extensively with it and upwards of 90% of our camping and...

Will get the model details when I'm over at the camper next. Can't find a single image of the unit online at Amazon, eBay or even via Google image search despite a rather exhaustive hunt to find it without physically looking at it.

Hey all. We have a small RV that I have converted from a 100AH lead acid to a 280ah Lifepo4. The trailer has a simply and mostly dumb Elixir ELX-30 converter/charger designed for lead acid, of course. I have a small Lifepo4 specific charger that I've been using with the battery at home, but...

So, my understanding (and based on how many others who use PSU's for charging, including lots here) is that you set the BMS accordingly to disconnect once the SOC you desire is reached. So in my case, being a bit conservative, I'd set the BMS to disconnect charging at 3.35v (90% SOC) and not...

Existing converter is absolutely 100% lead-acid only - the RV preexists the point manufacturers started putting switchable units in RV's. I know a lot of newer RV's are coming with SLA converters that can be switched into a lithium mode, and some others have the ability to add a module to...

Excellent, thanks for the info. I've been reading a lot about the importance of the absorption phase with lfp's to achieve and maintain proper cell balancing, and if I'm understanding things correctly it seems that without 14.4v it may not reach absorption, but with a BMS with a full 2A...

Is putting a solar charge controller between the charge source and the pack an option to *ensure* that charging is turned off before overcharging a viable solution? That's my biggest concern especially since this unit is occasionally used by family and friends, so a long drawn out "Turn this...

Hey all...just bumping this thread as it seemed to be inline with what I'm looking for. Just finished assembling a 280ah Lifepo4 pack for our RV but a 120v charging solution is the next hump. I've seen a lot of discussion about server power supplies but there's so many rabbit holes when...

Hey all - does anyone have the JK BMS app APK that was functional on at least Android 9 that they could provide me? I am primarily an iPhone user and have only a few older Android devices for a few simple tasks, but my newest device is still running Android 9. Long story short I want to...

I'm in the final stages of building a 280ah LIfepo4 system. BMS is a JK 200A with all the goodies, high and low temp cutoff, full programable, 2a balancing, etc. I'm still a bit foggy on the technicalities of charging, and it's the last piece of the puzzle. Can someone answer the...

iPhone JK BMS users, do not update the app to the version that was released today - it has a major bug where the entire settings page is now blank, at least for me. I've killled the app a few times and reset etc etc, but still no settings - it's just a blank page now. If you don't have...

I want an extension for this cable and am not super familiar with JST's. This is the small display option for a newer (silver style) JK BMS. I'd rather not get into cutting and splicing (not sure how easy it will be to strip back that sheath and there's not enough existing bare cable) so...

Pack is together and working well. Testing is going well. Looking for more advice on charging. I'm getting mixed info on the necessity for a "special" Lifepo4 charger versus just using a power supply that can be dialed to ~14-14.4v. Some are saying to never use anything except a...

Unfortunately that version gives me an "unsupported hardware" popup when I try to connect. It sees the BMS but as soon as it tries to go to the menus it craps out. Ugh why does JK make this so hard?

Alrighty, on further consideration I think I'm opting to shy away from the PSU charger option. Big amps for a low price is alluring, but not if it means a potentially fried battery - penny wise, pound foolish. I found a local fellow selling a Wfco 50A purpose built Lifepo4 charger. More...

I am reluctant to try that in case it does end up borking something up as I need the battery this weekend. All of my settings are long ago configured and I can get away without accessing them until they fix things, however it may be a bigger concern for others.

Hey all. I've done some searching and reading here on the topic before posting, FWIW. Fresh 4s 280ah build. 200A JK BMS. The pack is performing well and with conservative settings is showing around 271AH in and out. I cannot for the life of me get the amp-hours/SOC to calibrate properly...

Thx. Converter already has a built in output breaker and appropriate sized wire will be utilized. House loads already have a separate fuse panel so putting a breaker/fuse on what will be basically a 12" run of wire headed directly to an existing fuse panel would be unnecessary, I would think...

So I went to my friends place last night to use his current android phone with the latest app version installed and can now confirm that the factory reset option was missing from it as well. I guess next stop is emailing JK and hoping for some sort of support follow up? Am I pissing into the...

I posted this in another thread but will post it here as well - long story short I need to do a factory reset of my JK200A unit as the columb counter seems to have lost it's mind and I'm giving up with trying to calibrate anything any more and just want to start over. Only the android app...

After a lot of very exhaustive reading here a few months ago I pieced together a good configuration for my 4S 280ah pack and had my BMS dialed in. Earlier today while I had my JKBMS app open I accidentally hit the stupid "Lifepo4" button that overwrote all those settings with the terrible...

So, @upnorthandpersonal, 4.9.2 seems to be the last version that will install on my old android tablet, but still no factory reset option in there unfortunately. I guess I'll have to ask one of my android phone friends to come over and install the app/reset for me. Can anyone running the...

Thanks! Followed up in the other thread on the topic of older versions so we're not replying in 2 places.