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My son just picked up a wrecked Prius Hybrid. He said it is totaled. Are the battery packs worth anything?

https://www.digikey.com/en/products/detail/te-connectivity-aerospace-defense-and-marine/5-1618388-8/2362831 The contactor runs directly off of 48v pack. Max voltage is about 54v. Spec says 60v is max input. I noticed the contactor was running very warm. I let it go and after 3 months the...

I read in NEC that grounded array systems use white for the negative. I can't seem to find that clause. Anybody know where it is?

I am picking out wire for underground run. I think either one of these would fly. The stuff is a little pricy - glad it's only 150' run. I just want to get some more eyes on it before I pull out the credit card. I will probably go with nassaunationalcable.com as they are close. Comments are...

Do the smaller passive balancers work ok? I have to wonder if a few hundred ma of balance current is enough to do the job.

Here in New Hampshire (The Granite state) we have a lot of ledge to deal with so running wires underground may be difficult/impossible. To complicate matters I have a large stone wall between point A and point B. I am thinking a combination of underground and overhead. I have two panel...

Is anyone stocking the EVE 280 cells or comparable here in USA?

I would like to be able to monitor my battery array remotely. I have a flip phone and have no plans to upgrade to smart phone. Is there some kind of bluetooth device that will pair with my BMS that is reasonable price? I am using the Overkill Solar BMS. My battery pack is in a corner of the...

Most switched mode power supplies (smps) exhibit what is called negative resistance. Many motors pull less current when loaded than when unloaded. Any more?

Is there any reason to use 3 stage charging profile?

I heard it was McCain that launched the rocket.

I have BMS from Overkill. I was putting about 40amps into pack and state of charged jumped from 33% to over 90%. I have no idea why it would do something like this. I have not email them yet. Thought I would throw it out here first.

I am looking for a document that might explain how to set up BMS. Manual I have is vague or does not address some settings at all - to be fair I do like the BMS though.

I have just received a Meanwell DBU-3200-48 charger. I am using to charge the EVE280 cells. The default programming curve is 57.6v boost and 55.2v float. 57.6v/16=3.60v Are these good numbers? I can purchase the programmer and program a custom curve if I need to. thanks Roswell Bob

I have 4 stancions for lead-acid battery racks. Each pair has held 16 Die Hard deep cycle batteries - about 1000 pounds worth of cells. Shelves will accomodate about 11" tall batteries. Stancions weigh about 60 pounds each. These are rugged uprights. Free to you for shipping from New...

Charge relay circuit uses digikey parts A122275-ND & 570-1393-ND

I received a Meanwell NPB-1700-12 charger on Monday. The unit was supposed to have been cancelled as I ordered a larger 3200W charger. I spoke to the salesperson at TRC and she was very apologetic. She said her fault and no problem they will send me a shipping sticker to send back. I told...

I am curious as to the variability in same design batteries over time. If you smoked a battery and had to replace one in a string then what have you observed? Has new cell performed ok? Did the cell balancing mechanism do it's job? I expect as processes matures and recipes are tweaked the...

I will be receiving a Meanwell NPB-1700-12 charger on Monday. The unit was supposed to have been cancelled as I ordered a larger 3200W charger. I spoke to the salesperson at TRC and she was very apologetic. She said her fault and no problem they will send me a shipping sticker to send back...

I am curious if the bargain cells (that many seem to be happy with) have any problems staying balanced? Are there some balancers which do a better job than others?

CONTACTOR will not switch any current. I will load up to 125A or so. Is Gigavac contactor any better?

I have completed a board design for a pre-charge circuit. I then decided I could do autiomatic inrush limiter with 2 or 3 parts. I have attached picture of 2 component design. With a 0.1ohm NTC the inverter bus is up in a couple of ms. The charge contactor will take a few ms more to switch...

I am about to bring a good size 48v LiFePO4 array on line with new Midnite Classic 200 charge controllers. I have been using some Make Sky Blue controllers on my existing Lead Acid array. I have not had such good luck with these controllers. I get these big fat sparks when I connect them up...

Warner New Hampshire is here for me.

I am familiar with circuits that switch resistors in and out to balance cells. I am curious to know of any balancers exist where a mosfet is used in the active region. A mosfet can dissipate as much power as a similar size resistor and the power can be varied as necessary to balance the pack...

I am looking for a half-dozen or so boards fabbed. 2 layers through hole 3"x5" solder mask and silk one side. Looking for local USA source with 1-2 week spin.

Since this forum is living advice I would bring up tractor. It is good investment. When figuring out what your going to do you might want to consider tractor. Wife and I bought 40 primitive acres. It is on a snow mobile trail above a lake and so on. Driveway is near 1500' of hardpack...

My 48v Sears Die Hard lead-acid pack is about dead. I am doing a 48v LiFePO4 pack to replace it. But first I am doing a 12v LiFePO4 battery pack to run lights and small TV at night. I want to get some experience with the LiFePO4 with a smaller 12v pack before I put the 48V pack together. So...

I am laying out a simple board for inrush limiter. Board is automatic so that BMS never has to start into an empty capacitor bank. While charge resistor will be on board there will be connections for an external contactor for the main current. There is also hooks for an external on/off...

When connecting up a solar charger is there an order to follow? It seems to me that the panel side should be connected first and then the battery side. I am concerned that the diode in the upper transistor might fail from surge current. I think there is probably a good sized capacitor on the...

I am buying a small inverter to run TV and Refer off of 12v. I am thinking that I should get UL1741 listed inverter. I am off grid and aware that I have not paid enough attention to NEC and so forth. Is UL1741 listed inverter what I want? I would entertain suggestions for 12v/1kW pure...

(EDIT) I just want to mention that these NTC inrush limiters are HOT. Keep them away from flammable shit and don't get burned. I have used NTC thermisters to limit inrush current on large industrial inverters. It is actually a very old idea as we used them in the 1970s. The idea is when...

https://www.amazon.com/ARES-4-inch-Visibility-Markings-Readings/dp/B07BFGN53Y

I need to know the gauge of the balance wires. Documentation calls out #16-22, but connector on board end of wires calls out #22 - #30. thank you.

Does anyone know how the bus capacitance of an inverter is chosen? I have been told that a 6kW inverter should have 0.1F from one source, and 0.028F from another source.