Not usually, they'll go into an open circuit mode, where measuring the voltage with a high-impedance voltmeter with no other loads may indicate something, but without proper documentation it's hard to tell. Some batteries have separate charge and discharge FETs, so you can still discharge them (in which case a low-temperature disconnect will just prevent charging, but discharging will work OK, and the voltage will remain sane, but less expensive BMS may just disconnect them entirely). Low voltage will not hold at the low-voltage disconnect voltage, but will drop to zero with any kind of load.
Yes with no battery voltage nothing moves. Need to check in the early evening to have a full battery and see where the amps are flowing.
Yes with only 40A of charging current available on a 500ah bank and batteries deeply discharged. He likely doesn't spend enough time charging above 27v
sure I can. that would be when my non existent indivudal battery disconnects would make that an easy job.
That's not what he said, use an AMMETER to determine current flow, so you know if you batteries are discharging. Deterimining SOC from battery voltage (except at the knees) is second only in inaccuracy to weighing the batteries.
most days they are at 28-29ish at mid day sun. the close of the day they are usually around 27
ya kinda lost me there, that's what I did, A clamp on amp meter no flow.
That should be enough, unless some of the batteries have taken themselves offline due to cell {over, under}protection. I really think you need to isolate the batteries to determine if all of them are working.
OK, but then you lost me at "notta, no voltage." on your clamp-on ammeter.
not till it's back above 60 degrees
I can do that. however see ^^^ post above. haha
yes I have done balance and charge testing before, about 6 month ago when the batteries were replaced (and upgraded from 4 to 6)
Fluke clamp on meter set to amps,,, I said it wrong . my brain said amps but my fingers types volts. I just washed them and can't do a thing with them.
Does your Fluke clamp-on ammeter read AC and DC amps? Fluke has a whole lot of test equipment available...
Indeed. Select and order the breakers and carefully remove the battery positive leads once, and then reassemble safely, there's a lot of potential energy there...
you got that right. I can weld with 2 batteries on a golfcart.
wife saw your post here stopped waking up at 2am to use the hair dryer while you sleep. I had a similar issue a few months ago.
now I'm embarrassed, yes coach. I will need to do some math to speck out there breaker load.
well crap, I was hoping one of you would have chimed in and told me what the best size is by now.
These are a waste of money, with zero benefits.
no, I'm experiencing batteries that have had so many of my free range electrons pulled out if them over night with no more load than the inverter and controller's idle draw that the BMS has turned the bank off and then it stops the draw. . but only if the array is connected. with the array disconnected there is no draw and the next morning the bank's voltage is where is is on any other morning before this started 4 days ago
Sounds like a faulty charge controller.
