Yeah that's what you should expect. The cell block voltage variations won't vary too much until you get up to top balancing voltages. If you can get each cell up to 3.45 without any cell going over 3.8 on the first try it means they were pretty much balanced already. If you find it takes days or weeks then they were out of balance.
Equalizing starts at 13.44 and continues up through 14.6. but isn't really that effective until it gets above 13.8.
Hey Manny....I'm still making my way through this thread so I'm not sure if anyone else has responded to you re your battery wiring. You will achieve better battery performance and balancing by moving your feeder cables to opposite ends of your battery bank.....i.e. Positive from top right battery, Negative from lower left battery. Even better would be to use separate cables for each battery and run them to a common bus.....be sure to keep all cables the same size and length and use a little dielectric grease on the connections to ensure a good low-resistance connection. You may find this link useful: http://www.smartgauge.co.uk/batt_con.html
on the version 2 you can reset the board by disconnecting the power cable to it. It doesn't forget the flags but for some reason the light goes green after it boots back up. I don't remember which one supplies power to the board but you can probably figure that out pretty simply with a multimeter.
I think the reset count literally means how many times the board has been power cycled. I've seen people run their battery down so low that no lights were flashing not red or green but it did not trigger a reset count when recharged. It's possible the board was still keeping memory though because it may have had a little bit of power but not enough to light the LED any longer. But seeing how high your reset count is I think you're onto something with your thinking that it resets whenever the battery gets to dead.
Correct I've seen no battery failure flags yet
I have a Thunderstruck VC1 BMS and it does activate the internal Cell balancing. You will notice the blinking light go from 20 seconds to 5 seconds. I have also hooked up the USB connection and can read the cells voltages. I have also used the USB connections I built and connect to the Valance software and checked out the Cell voltages and temps. Read this entire thread and you will have all the answers you need. Thanks to Travis for all the work and posting answers. I have two of the U27 - 12xp batteries in my 5th wheel. Works great!(Had this posted in the beginners section, but it was mentioned that I should repost it here)
Hi all, I've been really appreciating reading this forum and have gotten lots of useful information from it so far. I have a few questions that I couldn't find the answers to on the Valence super thread post (maybe I just missed it?)
I've bought 2 of the U27-12xp batteries thinking they were like the smaller ones Will broke down on youtube with the internal BMS. (yes I know, should have done my homework better.) I'm planning to use them for an off-grid van build. I want to run the 2 Batteries in parallel and have them charge off of solar, the vehicles alternator via a DC-DC charger, and shore power when needed. My question is this: Do I need to worry about actively balancing the batteries, or will being in parallel do that for me? If not, will the Thunderstruck VC1 BMS activate the internal module to module cell balancing? ( I apologize if I am not using correct terminology, I'm very much a beginner). I know that the Thunderstruck needs to be hooked up to a contactor or relay to be able to disconnect the battery, but will it provide the 5v necessary to "wake up" the batteries internal balancing function? And finally, does anyone know if the Thunderstruck will trigger a contactor on low/high temperature based on the internal temp sensors in the batteries?
Thanks so much for taking the time to read my post! I'm very new to all this, so I really appreciate this wealth of information here!
Tried to upload manual but didn’t work out.
Awesome! I am going to pick one up for sure. I'm very grateful of all the information here, it's been super useful!
Thanks for sharing that email, that's good to know that you can set a high/low temp cut off with it. If it only balances the cells in the individual modules, do I need to worry about the modules being out of balance with each other with two of them in parallel? (assuming I've done a good job balancing them before connecting them together)
No prob.
