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The voltage settled down a bit more, I waited for it to finish settling before I turned on a load so I could get an accurate reading. Under load all the cells seem to be matching voltage. Droop is only 0.3v@350w, 0.9v@1300w, and and my draw is sitting at 1650w right now and we're seeing 1.05v of...

Everything is charging. The battery was most definitely dead, but it is indeed 16s. It was down to 48v. Set constant charging to 57.6v (recommended by the inverter book for 16s). The BMS app and inverter screen agree about the battery voltage, but my handheld voltmeter actually claims it is...

It will run fine for a few cycles after the battery is charged, it's just when the battery gets down to around 50 volts. Around that voltage, it will start shutting itself off the second the load kicks in. Keep in mind, yesterday was my first time ever using the system, so I've only had one full...

I will check on that as well. Hopefully I can find some sort of monitoring, and get a bunch of answers for us 😁

Awesome news. I will keep this post updated, app claims 4 hours of charging remaining (can only charge at 25a with my little Honda generator)

Noted. I will look into the app, although I think I need a separate module it did not come with for that. I'll find out. I will also check voltage at the battery terminals, and see if it matches what the inverter is claiming. I will get back to you tomorrow after work, thank you so much!

So the app is stating that after charging for the last 2 hours or so, that I've actually gone down slightly in voltage, but the capacity is up to 45ah remaining. Before it was stating 7ah capacity remaining. How has the voltage actually decreased while it's been charging? Interesting.

Okay, so if that's the case, then my original question; will the battery get damaged if it goes under the minimum recommended voltage while under load, even if it comes back up to an accepted resting voltage?

Awesome. Then I will do some quick minimum checks, because I do suspect something is up (a bad cell causing a low string, or a poor connection inside, or a crappy BMS) and if I find nothing, then I will set my shutoff voltage down to 40 or so for testing. A second battery may be necessary, not...

Hey all! I searched the forum, but didn't find anything that specifically answered my question (although I'm sure one of the 40,000+ posts on here would answer my question, I couldn't find it.) I have a system comprised of a 48v 100ah 15 string LiFeP04 battery, a Renogy 3500w 48v inverter...

I will check tomorrow after work, and find out if the battery is actually experiencing that drop at the terminals. If so, is it actually a bad battery, or could this be normal because of the high current demand? Also, if it is the battery, could it be the internal BMS? Thank you for the quick...

Okay, that was my thinking as well when I purchased it. I believe it's 32-35a of draw depending on factors. I'll see what I can come up with. For reference, it is a smilaxe battery. Amazon special, had good reviews though. If I can get it opened up (if it's "serviceable") I will get pics inside.

I guess I should have said in the original post; it's a Smilaxe battery, purchased on Amazon. I could not find any info on string count, so I called renogy and they claimed to know it was a 15 string. My initial instinct is it was 16 string as well. I will see if it opens up tomorrow, because...

The battery itself is no longer sold anywhere, although there are a few suspiciously similar (same dimensions, case style, built in rope handles etc) batteries under different names for sale on Amazon. It came with a book that has very vague information, but I took Renogy's word for it being 15s...

https://www.amazon.com/gp/aw/d/B0C5MFJP1K/ref=yo_ii_img?ie=UTF8&psc=1

I think there is a misunderstanding. I only have a single 100ah 48 battery. But I will put charging up to 16s, as you recommended, and see how the voltages behave when it's charged fully. I seriously appreciate your help! Also with 1/0 cable I should be seeing no issues, I have run the same size...

Well it decided it's charged. Claiming it has 135ah of capacity, if so that would be very impressive from a 100ah rated Chinese battery. But the low and high string worry me

And now that it's rested for a few minutes, the voltages have landed here. Seems very low to me..