Most reacted posts

I'm pretty sure either the welded studs or the threaded holes are done by the sellers, not the manufacturers. For last set of Eve 280Ah cells that I bought from Amy Wan @ Luyuan, I asked about switching from the welded studs to the threaded holes (my first batch had studs), and she said that...

The resistance of say AWG 24 stranded wire is about 26 ohms per thousand feet. So the resistance difference between a 28" run and a 4" run (2 ft) is 2 x 26/1000 = 0.052 ohms. If you have 2A running through that wire, the voltage drop difference is 2 x 0.052 = ~0.1V. That's enough to make a...

Thanks @BarkingSpider. Our current fridge is 8cf and I'm told by the foodies that it is too small. So a 3.1cf won't do. It does look like a good one though. By the way: Your forum name was the subject of lots of my dad jokes when my kids were growing up. :ROFLMAO:

I've been out of the country for a couple of weeks and missed seeing this thread. Sounds like there is some progress being made! I'm glad I sent my broken BMS to @upnorthandpersonal, and I'm especially appreciative for him volunteering to diagnose what's going on and help us all. I told him...

Since this got a sad face response from @smoothJoey, and I personally hate to make him sad, I want to emphasize that I really don't know. My comment was to encourage the OP to look into it. Please don't be sad smoothJoey. ;)

No. You still haven't been clear. It is NOT possible that one cell was at 3.7V and the others were not if they were connected in parallel. You said the "DC display" showed 3.7V. Do you mean your multimeter? Or the display on the power supply? If you set the power supply to 3.5V before it...

Everyone is talking about all the things someone needs to pay attention to when setting up a pack, except - as @Supervstech pointed out - this person had a fundamental flaw in understanding parallel connections. He/she had 6 5p "cells" and 2 1p "cells" with the 1p being on the most positive and...

Never, ever, ever trust the voltage displayed on the power supply. When you set up to top balance your cells, hopefully you adjusted the voltage with the power supply disconnected from the cells, measuring the voltage with the Fluke and adjusting it to the desired charge voltage. Ignore what the...

Right, but he has the max boost time set to 10 hours (600 minutes). So as the battery reaches full charge the current drops, so the voltage lost on the connections is decreased, so the battery reaches over 15.2V, no matter how much loss he has on the wire. So he will ALWAYS have a BMS HVCO.

If Wh is actually measured, it's fine. If the device is measuring Ah and Wh, both are fine (but neither is more accurate than the other). However, getting to Wh by simply taking measured Ah and multiplying by 3.2V is very inaccurate. The only way it would be accurate is if the voltage of the...

Yep, I agree this guy must be a troll. I'm out. @Will Prowse or @upnorthandpersonal or @Supervstech - I think this guy is wasting your bandwidth. I suggest you can this thread, and maybe the OP too.

Motorola - part of Lenovo - is a good example because their phones are great. Besides, opinions on Lenovo ebb and flow. I'm currently using a Lenovo laptop that I've been very happy with.

The key items to consider are the Vmp and Imp of the panels. When put in parallel, you want the voltages to be about the same (maybe within 5%). So 5x the 355W Vmp should be within 5% 5x the 365W Vmp to avoid losses. When put in series, you want the currents to be about the same (within 5%)...

Spot on @Steve_S - I actually did have a hobby of electrical and electronics, so did already have 3 different multimeters, a heat gun, and a hydraulic crimper. And yet, somehow I spent at least twice what I spent on cells for the other stuff. Of course, now that I have this stuff, it is...

This. I really wish there was a way to have the SCC - which already has the BTS temperature info - control the charge rate based on the temperature. Maybe there is one that does, but my trusty Schneider doesn't.

@robby - Have you actually looked at the graph you posted? The three blue lines are showing the capacity over time at 30°C, with SoC at 30%, 65%, and - you guessed it - 100%. So yeah, if you STORE LFP cells at 60°C or even 45°C your capacity is going to drop off, and it will drop off more if...

Lithium Iron Phosphate batteries are a subset of all the possible Lithium Ion batteries. There are lots of battery chemistries that are Lithium Ion, and LFP is one of them.

In my experience, once you get to a bit under 3.4V it will accelerate quite a bit.

I have a couple of thoughts that maybe are really questions. First, regarding batteries talking to inverters. I understand that there are a few things that communications between batteries and inverters can help with. The battery (or rather, the BMS) can provide more accurate voltage and state...

I find it pretty entertaining to find a thread started by @snoobler over two years ago has just be replied to by @sunshine_eggo. I guess I've got a strange sense of humor.

A note of warning: Most clamp meters - especially the cheaper ones - will measure AC amps only. For most purposes mentioned on this forum, DC is critical, so keep an eye out for that. Years ago I bought this one from Harbor Freight...

I'm betting that was a typo @Gazoo, or at least I hope it is. :oops:

Yes, it does, and more than I had realized. I had 8 cells that I got from Amy Wan last November. They came with capacity test results (I assume from Eve), but I decided to test them anyway. It was in the 50°s in my garage, and I figured that was warm enough it would not effect the capacity. All...

I guess they don't show up in the photos, but there are 2" casters on all four bottom corners. The two front casters have locking brakes.

It may be more personal philosophy, but I think you should always consider the BMS as the last ditch protection of the battery cells. I think putting in a LVD at 3.1V per cell (or even as low as 3.0V per cell) on your inverter is a good idea. I wouldn't use the BMS to do the LVD for your inverter.

Disconnecting the balance-lead connector from the BMS effectively powers it down. In my experience with the JBD / Overkill, doing this resets some stuff (like any faults that have accumulated), but keeps the same parameter settings. So unplug the balance lead connector, let it sit for a few...

Ok, so I understand the idea of not using the battery power to heat. It's probably just me, but I think that the various cut-offs of the BMS (low voltage, high voltage, over-current, low/high temperature, etc.) are the last line of defense. If you trigger one of them, you have something wrong...

I use the Victron Smart Shunt as my primary SoC indicator, although my JBD BMS is always within 1% of the Victron. So those two are good for that. The Thornwave Labs Powermon 5s has a cool relay control pin and from the app you can define rules for how it is triggered (timers, pack voltage...

I realized I didn't post the pic of the board holding the BMS and the Active Balancer. As discussed earlier, this board was not attached, but is held in place by some window screen latches. I have a ton of little plastic offsets that I used for the BMS and the Active Balancer, as well as the...

Since my battery box and heating system will mostly be unattended while it is doing its job, I'll be testing it through this winter here at my home in Denver. I bought three loggers. Two temperature loggers. I'll put one at the bottom of the box, near the aluminum heat sink, and one resting on...

I'm not sure how I didn't see this post when you posted it. Sorry for coming in late. First off: My nickname became "Solar Steve" in my family when I was put in charge of doing the design and most of the install of our Schneider-based system. Anyway, I like you handle @Solar Steve. In 2016 I...

I don't think he's still around, but a forum member by the name of Bill Taylor posted (in a thread I started in 2021) that he did an experiment and found that LFP cells did warm when discharging at 0.25C, but didn't see much warming when charging. His post his here...

If I understand correctly, he has 12VDC available in the caravan, and he has a router that runs off of 12VDC (but normally uses a wall wart to convert from ~230VAC to the 12VDC). If that is true, I think he should be able to just skip the transformer / wall wart and power it directly from the DC...

I get what you are saying, and you may not be far off. So I was jumping to conclusions. Let's look at the math... 22AWG stranded wire has a resistance of 16.14 ohms per thousand feet. So let's say we have 1 ft of such wire, so the resistance on that wire would be 0.01614 ohms. Now let's be...

If it were me, I'd have to shrug and ignore the extra couple of parts I had laying there after I had put it all back together. (Speaking from experience)

Oh. I never would have guessed that was what had you stumped. The app can connect to one of any number of the BMS's that are in range, so it wants you to pick which one to look at.

@Will Prowse - I seemed to have touched a nerve, and I didn't intend to. I'm really sorry for that. I certainly don't want a different message board. Like I said, I am fine with your policy. I really do appreciate that you have set this forum up and keep it going. This is - by far - the best...

You need to scale up. Here's a solar crypto mining operation in the little town I grew up in. 10MW of solar. https://coloradosun.com/2022/06/28/olathe-colorado-crypto-mine-solar/...

I'm going to wander into a bit of speculation here. Bear with me. First: I've purchased from both Jenny Wu at Docan and Amy Wan at Luyuan. They both are very trustworthy and I would recommend either of them. However, the prices you are comparing seem oddly far apart. I just bought 8 of the...

Oh man... That is so awesome. ? Yeah, but I'm lazy. So I was hoping someone else would do it. ;)

I have a pretty complete explanation of my heated battery box for our cabin: https://diysolarforum.com/threads/horseflys-cabin-solar-lifepo4-upgrade.27472/ No microcontroller or custom software required. Our cabin is about 9,000 ft elevation, and I keep the cells between 50°F and 60°F all...

You are not doing anything wrong @Vanhandler. You can try some of the shortcuts @BenQ and @S Davis have suggested, as those are fine too. But what you are already doing works. You just have to be patient. Once the cells get up to 3.4V, it will accelerate and you will be up to 3.65V before you...

Good point. Mine were the EVE 160's from Docan in Houston, and they were perfect.

Most of the capacity measuring devices measure Ah. The relatively cheap little boards with a big heat sink and fan do, and the more expensive ZKE EBC-A40L does too. They both may also show an estimate of Wh, but I've never even looked at that because I wouldn't trust it for the reasons I've...

I should correct myself. Although it seems like everyone is named Amy:ROFLMAO:, I meant to say Jenny. I have not communicated with Amy Zheng.

Maybe it's overkill, but for most of what we talk about here with LFP cells the discussions go to 3 decimal points of precision. 3.65 is not the same as 3.646, but if you only have 2 digits of precision they both could display as 3.65, or one might display as 3.64. Edit to add: My Fluke 175...

While I don't like hooking a fuse directly to wires hanging loose, I think putting a Class T fuse across a couple of appropriately spaced terminal blocks like these is perfectly fine, as long as nothing will touch the fuse (since there is no cover for it). Saves a few bucks off of buying a Class...