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Just finished my second LiFePO4 battery build. Actually this one is my fourth one, but two the previous two were not for me and so I didn't have as much latitude for the design. My previous build (discussed here) is for our mountain cabin, and had lots of emphasis on insulation, heating...

SFK has posted their own video now. I don't think they mention @RayfromTX but they try and make some bogus claims: He claims that the Ah measurements from the EBC-A40L is not accurate because there is some loss in the alligator clips. Wrong. The current is the current. All of the current is...

So I realized that I never updated this. The battery survived the winter and has performed great all summer. In fact, we decided to upgrade our loads a bit (added a fridge), so I decided to build a build a second battery. I didn't document the whole build as much, but may post a few pics of it...

I’ve looked / searched a bit and didn’t find anyone addressing this specifically, so I thought I would put down some thoughts and results of my computations and hopefully others will correct and/or contribute to a better picture. We all know that LFP batteries need to be kept above 32°F/0°C for...

To answer your first question, I believe that the risk of harm to your cells is by going below 2.5V. I know the real lower "knee" in the discharge curve is closer to 3.15V, but if you go to 3.0V you are still plenty above the danger zone. Let me give you some no kidding real data. I spent way...

I've said this to you before, and I feel pretty certain of this: There is no "Real Grade A" or "Grade B". The manufacturers don't use that term, and neither do their "real" customers. ALL the cells we have available to us are those that the EV/Automotive customers (that probably buy 98% of the...

Our family cabin was built in the 1970's, at about 9,000 feet elevation in the mountains of Colorado. It was wired (by teenage me) for 120VAC even though there was no possibility of grid power. We had a generator that we ran when needed, such as to run the well pump or for lights. By 2017, my...

Most politicians don't break the law until AFTER they are elected. :unsure:

Yes I tend to agree. I have a 8S 24v pack, and 2 12V, 12W heaters in series, so a total of 24W, drawing a bit over an amp from my battery when on. I have another two of the same heaters, and was thinking if I had to I would add them in parallel to the other two, for a total of 48W. I'm...

E-Panel usually refers to a separate box with all the breakers and bus bars to tie all the DC (and potentially AC) stuff in one place. I use the Midnite Solar E-Panel that was specifically designed to work with my Schneider SW4024 Inverter. In the photo below it is the box in the middle...

The main negative that I have heard / read about the Pylontech batteries is that they are 15 cell rather than 16 cell. So they are cutting corners and to give you what they are calling a "nominal" 48V battery, but it's charge and discharge will be one-cell short of what everyone else in the...

@curiouscarbon, I have to say that you seem to be one of the kindest people on this board, and I don't just mean in this thread. I really appreciate your "glass is 99% full" attitude. No kidding. Thanks for being you. Here's the reason that so much of what @Goboatingnow has posted bothers me...

Easy there cowboy. I'm not here to say your girlfriend Victron is ugly. ;) I think I saw one of your posts where you said you have inappropriate dreams about Victron equipment. (I loved that comment! ?) I in fact already have a Victron SmartShunt and am happy with it, and I really like...

After the early adopters complained about how easy it was to strip the threads on their prismatic LiFePO4 terminal pads, the market seemed to have responded by offering studs welded onto the original pad, rather than drilling and threading a hole for a bolt. That certainly sounded good to those...

What @Ampster said is correct. The float stage of charging is beneficial to a lead acid battery, but it is not beneficial to a LiFePO4 battery. However, most people use the float setting on their charge controller to allow the solar to power loads while there is sun available. If you disable...

@Michael B Caro - As one of your satisfied customers (230Ah cells x 8 that were great!) I hope you can take this suggestion / criticism in stride: Don't refuse to post here on a regular basis, and don't tell people they need to do something that doesn't help. Complaining to UPS (which wasn't the...

No offense Richard, but this sounds like you are saying there is nothing wrong with the batteries. I don't think you know whether there is something wrong with the batteries or not. Reading about the problems on now multiple inverters, I'd say it seems very likely that there is a problem. You...

By the way, in case anyone needs to get ahold of Jenny Wu here's her email address: jennywu896@gmail.com I highly recommend Jenny and Docan.

Maybe my skimming through the video missed it, but I don't see how this video has ANYTHING to do with Ray. It seems like he is saying the extra money to get stuff from Sun Fun Kits doesn't get you any more capacity. I don't think he ever says anything about Docan, just about Alibaba in...

On the left side of the box I ran the positive / red #2 cable out and ran through a disconnect switch and fuse, ending on a a 5/16" terminal post. I also ran the negative / black cable out the back of the box to another terminal post (no photo -sorry). Here's shots after I completed wiring...

I also use the EBC-40L. Yes, it does report watts, but anytime you insert voltage into a test of a battery (which you must to get Wh) you introduce some nuances because the sense leads may have a better contact in one case than another. A higher discharge current will result in a lower voltage...

I really do think highly of Amy Wan of Shenzhen Luyuan. I bought a batch of 280Ah Eves in 2021, and they were great. The only problem was shipping from China. The shipment was delayed quite a bit from what she had estimated, and at one point it seemed the logistics company just quit giving her...

I've actually purchased several different pads of the years, all 12V and either 10W or 12W. For the 24V batteries I've built, I just used two in series under the aluminum plates. For the two Trophy batteries, I used four in series, with one on each side (left and right) of each battery. I know...

I'm with @upnorthandpersonal on this. When a cell is tested it is measuring the current every second, and summing this up over time to give an Ah measurement. If the tester is also measuring Wh, it is calculating that ever second as well. That all is accurate. But to get to Wh by taking this...

I started to type in a response but @smoothJoey beat me to it. So I'm starting over. Tying in to what @smoothJoey said: If you are setting your charge controller to charge at 3.5V per cell, the charger will be in constant current mode until the voltage of the battery gets up to 3.5V per cell...