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Over the past several months I spent some time porting an earlier github project called NodeJBD to support the JK BMS. This is a node.js written application which polls active data parameters from the JK BMS and displays on command line, or the data can be published to MQTT and read by other...

I think this is a question @Steve_S or @upnorthandpersonal may be able to answer. I'm trying to write a python script that can write data to the JK BMS via USB-TTL. I found the documents here, specifically "Communication protocol between monitoring platform and BMS.pdf". There is also a...

Is there such a thing as a normal, or acceptable range, for the cell voltage differential at top of charge? Strictly as an example, if a 230ah 8s pack stops charging at 27.8v, leaving it’s cells with a [min, avg, max] of [3.440, 3.475, 3.498] and thus a 58mV cell voltage delta/differential...

Since installing my 8s2p 498ah LiFePO4 setup, I've had recurring issues with so called "runners". By that I mean, 1 or 2 cells in the pack will go to a much higher voltage than the rest of the cells whilst under charge voltage. For instance, when charging my pack to 28.00v, at 27.9v or higher...

One thing I haven't been able to find much in the way of recommendations for, is how you should go about the initial charge and syncing of two batteries prior to cycling them in parallel. Is there a step by step process you follow to do it? I know some of the basics, like pre-charging both to...

I have heard its recommended to use scotch brite or very fine grit sandpaper on bus bars, terminals, lugs and battery studs. What about tin plated copper surfaces like a Blue Sea Class T fuse holder, a battery switch terminal stud, etc. When sanding - at what point do you stop sanding? When...

I have a 498Ah 8s2p setup where the two packs were recently installed in parallel. I top balanced both packs and charged both individually to 28.00v before connecting them together. As expected the voltages are identical as measured by my dual JBD BMS's and current flow between them at idle is...

Probably a long shot, but wondering if anyone has been able to identify the connector in the photos. This is the 4-pin Bluetooth module cable that connects into the UART port on my JBD 8s 100a smart BMS (SP16S020). I want to make some longer cables because my batteries are in a steel cage which...

I'm in the process of building an 8s2p LiFePO4 12.8 KWh DIY Powerwall and I have assembled my 230Ah prismatic cells first in parallel, and top balanced them to 3.65v with a bench power supply. After assembling in series I'm seeing good balance between cells of around .003, never over .01 while...

I have an 8kw system with enphase microinverters installed about 2016. It is under a 20 year PPA agreement so I really cant modify the system. The system ties into my main panel via a 2 pole 40 amp breaker. The main problem Im trying to solve is I want to add a battery backup to the system that...

I'm searching for an inverter that increasingly seems like a unicorn. After trialing a few I just cant seem to find the one. Anyone have any recommendation on an inverter that would meet these specs? - 24v/2000-3000w - NO low frequency transformer hum (its going in an occupied space) - Hard...

Looking for a recommendation on a solar project Im thinking about. I have 600 watts of solar on a shed that has been converted into an office and have 12s lifepo4 230ah of storage as well. Ideally Im looking for an inverter/solar charge controller that can power the shed during normal...