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I found a new paper. It took me a while to get access. Message me if you'd like the PDF. This paper built a model to predict the degradation at various temperatures, charge rates and state of charge. Then they tested cells at various conditions to fit and validate the model. They didn't talk...

Finally finished my 75hr capacity test! 100.7Ah, 1283Wh I'd say this battery has passed all my testing so far. Aside from opening it up which I don't plan to do, I'd say it's a steal at $200.

I have an epever tracer1206AN (10A 60V). It was purchased February 2022. I have not updated the firmware. It has low temperature charging protection and it came with a temperature sensor installed that looks like a germanium diode. Protection turns on automatically when you switch to the...

I just discovered this post from a few months ago which discusses using "BS88" style fuses in the LET and LMT series including the idea of bolting directly to the battery terminal. This forum is great. There are actually lots of options in the BS88 Style and all have at least 40kA interrupt...

I would yes, but I certainly understand why things might be different for others. I live in a climate where we often have lows around 30F and it rarely gets below 25F. My batteries so far are all cheap Chinese 12V 100Ah batteries so I'm not expecting to have any manufacturer support anyway. You...

I've had mine for a few days. Looks pretty good. Came with M8 bolts and lock washers. Ran it to dead through my Victron Phoenix 500. It ran my 500W food dehydrator for about 40minutes until the voltage got down to about 9.7V and the low voltage cutoff worked. It's charging up now. The heater...

Supercaps are about 50 times more expensive per Watt-hour than lithium batteries so maybe it would help, but you're probably better off just buying more battery. The cheapest supercap I could find is this one 2.7V 500F for $5.87 each. That works out to about $11.50 per Wh. That generously...

Good Info! To put some example numbers to this, assume you have a 12V 1200W inverter during a max power surge from an AC compressor starting up. That surge might peak at 15A 120V. Which is 15A*120V=1800W. To attempt to supply that load, the inverter is drawing a lot of current from it's 12V...

Nominal capacity: 500Ah Maximum charging current: 50A Instantaneous discharge current: 200A Continuous discharge current: 100A

This topic has been discussed many times here and I'm well aware that standard practice is that you should not attempt to charge below 32°F but I found the previous discussions lacking in rigor and specifics. Actual tests are difficult to do without access to electron microscopes and lots of...

Yes I tested that on accident with the metal bottom of my victron phoenix 500. Made a spark but then went back to normal. I'm real thankful these have short circuit protection.

I was also a little confused by that paper, and I'm not sure exactly what they mean here. I'm not an expert in this field so some of the jargon and chemistry are over my head. That said, I'm confused why they say a "some partial recovery". If you look at the chart I posted (the blue dots) you...

Just ordered an Ogreen 12V 100Ah for $166.55 + free shipping. That's the cheapest by far that I've ever seen at $0.126/Wh. I'll do a capacity test with my DL24P when the battery arrives in a few months. I've had good luck with Aliexpress for the most part. Except one order in the past I got...

So I did some "lab" testing in my shed on a little 120V R600a Wine Fridge I picked up at a garage sale for $20. I didn't really mind if I killed it but so far it's still fine. I hooked a 0.5ohm power resistor in series with the neutral wire and measured the voltage across that resistor with my...

I was getting sketched out tightening and loosening the bolts on my 12V 100Ah Amazon batteries with an uninsulated box end wrench. I have some that are M8 bolts and use a 13mm wrench and some that are 5/16" bolts and use a 1/2" wrench. But thankfully those sizes are so close that a 1/2" wrench...

The dobelay 12V 100Ah batteries weigh 22.3lb each. Strangely the "Copper*" terminals on the batteries are not M8 threaded. (According to the picture: "*Ordinary battery use iron, we use copper") Two black 5/16"-18TPI bolts are included loose in the cardboard box and they thread in nicely but M8...

I agree 1-2Nm is not that tight. It seems like they are warning you against overtightening it. Your electric screw driver is probably not accurate or calibrated to anything but probably in the right ballpark. 2Nm is equivalent to 20.4kg*cm. So if you applied a 1.6kg weight to the end of your...

The Weize 12V 100Ah batteries are up to $310 after coupon. CHINS seems to be the best deal now at $285. The DJLBERMPW that was $259 last week isn't listed anymore. It's interesting how much the prices on these fluctuate day to day. I think if you can watch the prices for a few weeks you can get...

This community understands Volts, Amps, Watts and Watt*hours. Stick to those terms if you want to convince anyone here. It only takes about 5-10W to make a LED lightbulb bright. A large box fan only uses about 25W on high. You are talking about getting around 100W out of your solar system in low...

I looked for any sign of this in the waveform and couldn't see it. I think this is a synchronous motor which runs at whole number ratios of the mains frequency so 60Hz*60s/2poles=1800RPM so that would explain why you cant see any motor noise on top of the 60Hz wave. Yeah agreed, but there may...

I mean that's one reason. It provides a small amount of protection from putting a wildly wrong sized fuse on a system, but you can still put a 400A fuse on a system designed for 225A. And there are actually 5 sizes in the Class T fuse lineup catalog. Blue sea systems only carries 2 of the sizes...

It's usually OK to connect the outputs of two chargers together as long as they both have similar output/float voltages. These batteries shouldn't be charged over 14.4V so as long as both chargers put out somewhere in the range of 13.5-14.4V It should be fine. A benchtop power supply is helpful...

There are some unbelievable deals on amazon right now. I just picked up 2 of these Dobelay 12V 100Ah lithium batteries for $210 each! There is a 65% off coupon at checkout. It says you can only use one coupon per order but it let me make two orders within 10 minutes on the same account, to the...

After much delay I finally tested the fridge with various NTC thermistors. The results are pretty underwhelming and I don't think using a thermistor to reduce the inrush current of fridge compressors is that great of an idea, but I wanted to report what I found nonetheless. Again I'll mention...

Lithium iron phosphate comes to America Companies are planning the first large-scale factories in North America for the inexpensive battery raw material

No I haven't tried to open any of my batteries. Based on videos of other people doing it there's not a way to do it without destroying the case.

It's no problem to charge a 100A battery with lower charge rates like 8A but the output voltage of the ecoflow is 13.6V which might not get the battery all the way to 100% charge or activate the balancing circuit. But that's not a big deal, it should be fine.

This is very interesting and clear data. Thanks for doing this test. It seems to be roughly what we expected. Very little loss at the transformers. The efficiency through this AC path is mainly determined by the inverter. I agree with @octal_ip here, since the voltage is also changing, we cant...

Its really pretty easy. Put it in a freezer for long enough to get cold all the way through. I'd say at least 8 hrs. Then immediately try to charge it with a low charge current (around 1A or less is fine). If it allows current to flow in, then it doesn't have protection. Often solar charge...

I agree if it can't put out 100A continuously then it's not meeting it's spec, but I looked through that video again and I don't see him test the maximum output current at all. Where does it fail to put out 50A? I think we would have seen a problem in the reviews if it couldn't put out 50A...