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The balance current of the JBD is very low (usually only around 150ma) and it's passive balancing. With large cells it simply won't keep up. Maybe you should add an active balancer. These usually have 2 to 5 amps of balance current.

OK, So residential/commercial grid tied solar is fairly popular. There are TONS of solar companies, that do the installation and handle the contract between you and the power company. Depending on where you live exactly, sometimes the power company rejects new solar contracts, because thier...

Unfortunately, I sometimes suspect Will has fallen into the same pot hole as other YTers. I bought some of the tools he recommended, just to be outright disappointed. They don't work like he advertises (makes things look easy, when they are not, and the tools don't work flawlessly like in the...

If anyone has been following my posts lately, I've been complaining on how hard it is to get Lifepo4 cells here in the Middle East. While it's pretty easy to get smaller cells online, like Topband 25Ah, or some no-name 13Ah cells, it's a real hassle trying to get the larger cells. I've been...

I wouldn't do it... It would probably make your cells unbalanced. Most BMS only handle a few tens or maybe a few hundred mA balance capability. You should use a DC-DC step-down (buck) converter. There are some that are adjustable, so you can play with the output voltage. I have this one for...

I can confirm it works with plain JBD (bought from Aliexpress)

My small grid-tied 1.2kwp system, 495 running days: Not much, but still nice to see the environmental benefits.

Yup... The BYD Dolphin ticked all my boxes as my next EV. - 60kWh LFP battery - 3kw (some say 3.6kw) V2L. - OTA updates - 5 star Euro NCAP Just received mine a few weeks ago: Lovely car... It has its own quirks and bugs, but they are fairly minor, so I can live with that. Back to our topic...

I would charge up slowly at first, don't push 10s of amps on a 18v battery. Below 2.5v per cell you can damage them if you charge too quickly. I'm not sure if 2.3v is that bad, but just in case, do it slowly until they reach say 2.8v per cell (22-23v total). Then you can charge them up as usual.

EV battery warranties are usually relevant if SOH drops below 70%. Most modern EVs (excluding Nissan Leaf) have active cooling/thermal management which helps alot with minimizing degradation. I really doubt that Hyundai/Kia EVs from 2019-2020 would have 70% SOH. Just for comparison , my EV...

First, this method has been mentioned/recommended previously. You should really use a BMS when charging as a pack. But yes, it's alot faster.

Looking closely, that's actually a JBD BMS! Nice...

How do you know these aren't defective modules that came off Chevy Bolt EVs (the ones that caused fires and a massive recall) ? I'm mean it's one thing to use second hand Lithium Ion packs, but whenever I hear LG CHEM, it makes me worry... I do have to say that it looks pretty compact for...

The problem is probably that you are leaving your inverter ON while connecting the battery again. This discharges the capacitors immediately. Try turning OFF the inverter first, then connect with a resistor for a few seconds, and then quickly connect the battery. After that, no sparks should...

No, it won't work... The microinverters will up the voltage to try to "pump" as much power out from the PV, but this will make the off-grid inverter blow up, as the current has nowhere to go... This is unless you have a constant load more than the microinverters can produce. But you can't really...

After writing this, I thought about it and got the motivation to fix my pack. I decided that just flipping the cells around would give a neater build, without having to move the BMS. Funny how things work out in your head after you write about them... Here is how it looks like now (with display...

Finally got to connecting everything: Time-delay relay, Tyco Contactor, and a voltage sensing relay for low voltage cutoff. The low voltage cutoff is not mandatory, but it's a feature I added, because I wasn't happy with the LVD of the inverter (at about 20v, which is pretty low for Lifepo4)...

Since when does Ford use LFP ?

I wouldn't use an evaporative cooler in any electronics environment. These put out a light mist of water, which will quickly cause corrosion and possibly shorts. Can your cooler work in fan-only mode? If so, I would try that to see if it's still effective.

What are you using this battery for ? Only DC loads or with an AC inverter? Basically, you should set your inverter's low voltage cutoff to a value higher than what the BMS is set to. That way the BMS won't go into LVD.

You don't need to break apart the pack. Although you can't do a proper top-balance without taking them apart, you can bring them up pretty close in voltage. The method is to take a PSU, set it to 3.6-3.65v, constant current (let's say 1 to 5 amps) and connect via alligator clip cables to the...

Nice build! Gotta love those plastic "ammo" boxes! Here's mine: Mine is a portable Solar 12v power supply. It houses: - 18Ah Lifepo4 12v battery - Win500 20A MPPT SCC with Bluetooth. - JUNTEK Shunt with wireless display (display out of the box) - Fuse box - Circuit breaker I'm currently...

As suggested on this thread and in other EV forums, I was convinced to swap the 12v SLA battery in my EV for a 12v Lifepo4. The advantages are clear: less weight and flat voltage curve should help my EV be more efficient. I thought of doing this as a second stage of my ongoing project, but as...

Not buck, boost! Probably just a typo, but make sure you get the right components. Buck converters are also called step-downs, boost converters are step-up. You need a boost converter (step up), unless your alternator puts out more than say 14.6v.

Seen that too. Probably a typo, but also a scam. Stay away from no-name (esp. Shopxxxx) stores on Aliexpress. Look for many reviews, and a store that's been around for a few years. Many have been scammed here on the forum from these stores, including yours truly.

The problem with these socket inverters, is that they backfeed a socket, not a breaker. A socket is usually just one component on a circuit, there could be more on the same circuit like lights, more sockets etc. This can violate the "circuit branch" rules (look it up). In short, it means that a...

You don't have to configure it, but it's parameters are fixed. I personally prefer BMSs that are configurable, so that I can set the parameters to match my needs. For example setting low/high voltage disconnect values. This is helpful if you want to increase the lifespan of your battery and use...

If these are like most MPP inverters, they usually suck air from the top sides and blow hot air out of the bottom. So you need to space them out a bit to allow airflow from the top sides and and the bottom to exhaust. In your case I would do a jagged mounting: Two at the top, two at the...

OK, so after hunting around Aliexpress, I think I found what I'm looking for: https://www.aliexpress.com/item/1005001570375459.html It's a time delay relay available in 5,12 and 24v. What's special about this one, is that has more programs than the previous one I quoted. Specifically I think...

I would recheck all grounding of your system. Having an additional ground rod could cause ground loops and introduce voltage on various components. Also, SPDs of this type should not be trusted to open the circuit when overheating, see this (video is of an AC SPD, but same applies to DC SPD)...