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Also, if anyone else is tired of having their computer reserved for battery monitoring- I found a small Nextbook on eBay for $20 running windows 7 and it makes a really cheap/effective way to run the valence software 24/7.

As a buyer of the eBay lv ubms, don’t do it. After waiting months for it to arrive from China, the seller wasn’t sure about which of a variety of schematic it used to connect. After another month of trouble shooting why it didn’t work, the seller reluctantly allowed a return. I got stuck with...

One more shameless plug for Travis... I ordered one of those imitation U-BMS from China and it finally arrived months later, and didn't work. Travis hooked me up with a high voltage version of the U-BMS being powered by a simple $20 step-up transformer taking 12v up to 60v, and it's...

Yes, windows xp, 7,8, 10... android devices running windows... the software is very flexible. I found a 4 tab version somewhere online. I can try to post it somewhere if anyone is interested.

Travis responded to my post back on page 4 about this issue, and despite my trying I couldn't get them to balance. I owe Travis a huge Kudos on this topic because he took my two problem batteries and he did exactly what he recommended in his reply and viola! got those two problem cells back...

Try a charger like this so you can precisely control volts and amps. Each cell Negative (-) uses the adjacent cell's positive (+). In the photo below, black wire/arrow is cell 1 (-), blue wire/arrow is cell 1 (+) AND cell 2 (-). Yellow wire/arrow is cell 3 (+) AND cell 4 (-). Brown...

I have not but please share if you are able to deconstruct.

Hey Mitch. Regarding your Q - #3, probably the easiest way to protect your batteries from over-discharge would be using something like the Victron Battery Protect (BP-100, 100AMP - 6-35v). It's a pretty inexpensive insurance policy for pricey batteries.

The usb communication dongle that I linked does indeed have the labels reversed on their diagram. The voltage out seems reliable and I’ve not had any problems with it yet or been required to use another battery for communication power.

No, that makes total sense. I’m still confused because my electrician designed the addition of 6 of my 9 panels and calculated ~20 ish amps with “a lot of headroom to expand”. What it sounds like from you and from what I observe from the system’s performance I could probably get away with 6...

I ordered the U-bms from China or us... wherever it comes from. They said it shipped weeks ago. This virus is making my overall system install take for ever. Thanks again for the help, Travis. After reading your follow-up and the battery manual I’m left with the impression that there’s no way...

If anyone has interest in a non-working low voltage BMS (Chinese valence version) PM me.

Why not just use one of the high voltage Valence BMS? Travis got me one with a simple step-up to supply the higher voltage and it's working like a dream.

The panels will output over 100 amps at full power in a 3x3 string? I always get confused on series/parallel combinations but I thought a 3x3 configuration would be putting out closer to 21.8 amps and 115.5v?

Thanks for the help, Craig. I hope it is just the breaker b/c this is my third charge controller in as many years. Can you elaborate on your math a little more? Using online tools (the Renogy website) with three series of three panels parallel panels I don't get how you come up with those...

No. Leave it connected. Attach a small wire hook from your charger output to where the colored wire in the photograph enters the connector. If the hook is small it will hang right there and make contact.

I got my XPs hooked up yesterday and monitored closely throughout the day. My U-BMS has not arrived yet but so far so good. I'm using an Outback Flexmax 80 charge controller and wired up my XPs in the following format: Except, all of the 24v (-) are equal length cables going directly from (-)...

I got my communication cable configured and connected my batteries to the valence software. No matter what I set my logging path to when I hit "Start Read" I get the message "Access to the path 'C:\Program Files (x86)\Valence Technology Inc\Valence U-Charge CP Module Diagnostics Software\Module...

Can you elaborate? I thought the battery protect is intended to protect the battery?

I do not have any red boxes on the Valence software, just the pink “communication error” box. Like you said, when I first reconnected this morning it didn’t show the error but then after a few minutes shows again. I’ll ignore it. Otherwise things seem fine.

Gotcha. Good to know. Yes, reading the instruction manual is always a sound practice.

I’ve had my laptop connected about a month now nonstop and two of my batteries won’t balance. They both have one cell bank that won’t go above 3.3v. I’m guessing this is why the batteries were retired. Has anyone else experienced this?

Got my new adapter today (https://www.amazon.com/gp/product/B077ZM1PSG/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1) and after going through the driver installation process it connected right up with no issues. I have a couple questions- my apologies if the answers are in the battery manual-...

Would I be correct in thinking that the SCC was never exceeding the breaker voltage then, just running in float mode, until we ran the battery bank down with the washer and dryer, and when it had to start really cranking out the juice to recharge the batteries that's why it exceeding the breaker...

So that gets me a step further. Running as an administrator definitely gets me the three tabs and no path error. However, it still won’t communicate. It just says check the com port and battery ID, which I know are both correct. I’m wondering if it’s not my cable. I ordered a different usb...

Thanks for the help, Travis. I’ve read and re-read the thread but it seems like a month of nonstop balancing should be sufficient to balance? I’ll leave them to balance for one more week and if they don’t come together I’ll take you up on your offer. I appreciate it.

I had one for my off grid home and it lasted a year. It started sounding an alarm and saying the batteries were low while reading 0 volts on the battery bank. When I would connect to my battery bank (8- Valence U27-12xp) they would read fully charged (27.6v). If I cycle the inverter on and...

So if my laptop is connected all the time is that $600 u-bms doing anything?

Thanks for all the replies, but as I said in my original post I’m confident about the comport and settings. My 485 converter cable is probably 4 years old, and has spent a lot of time at sea connecting sonar and gps for bathymetric survey. When my new cable arrives I’ll try again. This one is...

Right. I'm not trying to use the program folder as a path, that's just the error the program is throwing. I've got the program loaded to my documents folder.