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But therein lies the problem. Your inverter is on the battery buss. It happily draws power until the inverter low voltage shutoff kicks in. Perhaps your inverter is smarter than mine and that voltage can be adjusted. The fail mode I am concerned about here is relying on the humans to monitor the...

I thought that may be the case - (low voltage disconnect) I too am concerned with that aspect. The possible solution that I came up with to get around over-discharging my cells is to use the SCC Load Output as a control signal to relays. Thus allowing the SCC to shut off loads without needing to...

Using chassis ground is exactly the reason that trailer lights never work. When I replaced the lights on my utility trailer I searched until I found LED tail lights and marker lights for boat trailers that had a ground wire brought out of the housing. For the cost of an extra ground wire the...

Today was a slow charging day, but the batteries were all within 0.01 volts of each other, so I went ahead and put them all in. I built 3 battery trays that hold 2S5P sets. Hammered flat copper pipe bus bars. Each of the three trays (at about 40 pounds each) slides into a tower that holds the...

Sorry, that would have been helpful... Windows 10 64 bit.

Does anyone have the appropriate drivers that allow the USB connection to a PC? I got a DPS5012 with the USB board, but get error messages when I tried to load the app.

I'm reviving this thread since I have made some progress over quarantine. I did some successful charging with my DC-DC power supply for a while until I made the rookie mistake of connecting the output of a tray of 7S2P 12 volt UPS batteries to the power supply with reverse polarity. (Be sure...

I'm super interested in these. Even more so now that I know they are local to me.

Nothing like a good shower/bath after not being able to make a person feel human again.

I'm still learning, so take my input with teaspoon of salt. The BMS does other things besides monitoring cell balance. A good BMS also monitors temperatures to prevent charging at low temps, prevents overcharging, prevents over-discharge, and can shut off the battery if there is an over-current...

Will has already done a video and a chart on this. Note that there are caveats: loads or chargers connected to the batteries will skew the readings, and 'voltage as a state of charge' is an estimate. I would use: 13.4V (open circuit) as 100% 13.25VOC as 80% 12.9VOC as 20% (double for 24v...

You have clearly shown that you have large usage. I agree with most everyone else, find out where your power is going before you try to generate your own. I'm pretty new here myself, but most everyone seems nice, I don't think anyone is going to run you out of town. There may be a bunch of...

Interestingly enough I was reading this article earlier today from the "Most useful article I've ever read" thread. In that article is this passage: Internal resistance of each cell can be calculated prior to assembling them into a pack by charging them individually with an accurate...

3D printers have bed heaters that can run on 12vdc, 24vdc, or even 120vac. A little bit of smarts with a thermostat and Bob's your aunty. We've already decided that we can't CHARGE the batteries at a low temp, my understanding is that they CAN be discharged, so using a little bit of charge to...

My personal preference would be to number from negative. Thus the nominal voltage for each is the cell number times the nominal voltage. Cell 1 - expected reading = 1 x 3.2v = 3.2 Cell 2 - expected reading = 2 x 3.2v = 6.4 This also works well for the way you usually connect the bms monitor...

Did any of your grounding change? Size of wires from battery to inverter?

Dude, that looks great! Very compact and well executed. Is this for a camping setup or home backup?

I don't have a good answer to point 3: Shut off when charging is complete. But I own and am very happy with a DPS5015 DC-DC power supply purchased from Aliexpress. they even have an available serial interface (Bluetooth or USB) to do remote monitoring. You still need a DC source to start from...

UltraFire batteries are a well known joke in the Performance Flashlight community. Almost certainly not 3800 mAH either.

That's the one, thanks! I'm thinking the cheap one should be fine for me, most of the balancing should be done by a BMS, I just want to see the numbers.

I keep seeing @Will Prowse use this meter to check and apparently balance his cells. I've looked on the website and attempted a search on Amazon. anyone have a link? <edit> added link</edit>

I'm new to solar, but have been doing electronics for years. Most relays are available as both NO & NC together. They are often called form C relays. A single pole would have 3 pins, a normally open, a common, and a normally closed. You simply wire in on the terminals that work for your...

I have no Apple hardware, but I do know that the USB C specification is very picky about negotiating power delivery. It may be that Apple is following the spec and the supplies are getting confused because ethey are not as strict as the spec. Isn't the Apple lightening cord at least related to...

A little background to start with. I'm an electrical engineer by training, tinkerer by nature, and a cheap pack rat by upbringing. I also mentor an FRC Robotics team in what normal people would call spare time. So I'm used to experimenting and prototyping and failing carefully. I've been...

Well now. Camelcamelcamel just sent me a notice that the same panels are now on sale for $65. I just placed an order for 2 more. I don't know if I will keep all 4 or return the more expensive ones, but I could not pass that price up.

try it now.

I've had these panels in my watch list for a while and just got an alert that they are on sale for Cyber Monday 72 bucks a piece. I hope these are a good place to start. https://www.amazon.com/gp/product/B07GF5JY35/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 I think I fixed the URL