Recent content by Skypower

I’m sure our well prepared government has hundreds of thousands of transformers and switchgear standing by just for situations like this 😝

Yeah, I think I’m opening the breaker to the grid before I go to work in the morning. Probably the best thing to do. I’ve got one big house surge arrestor for what ever that’s worth.

When you lubricate the threads you increase the tension in the threads of the older terminals. The welded stud type is actually a captivated stud within a welded on aluminum puck. I’ve heard of both types pulling out when exceeding the torque specs for that cell model.

I know that smoldering and a burning fire emit different substances into the air, having a combination ion and photoelectric will give you the very earliest warning possible . Add a carbon monoxide detector for hydrogen detection you would have the ultimate system. I have a heat detector but by...

Before you panic see how hot it gets. If it needs some help a tiny fan can help a ton.

Happens to be my today’s project. Air blows in the plenum area, then across the tops of the batteries and out the top rear of the cover (seen in background). My bms’s are never much above ambient but my cells are getting warm in summer. I found that if I remove heat when it’s cooler 3AM to 10AM...

lol!!!!!

Check out RCinFLA’s chart post #9 https://diysolarforum.com/threads/lifespan-of-fet-based-bms.41223/

No, I mean at a full state of charge, the point where your voltage hits a wall and stays there a bit. The algorithm in my inverters doesn’t give me access to absorb time, usually between 15 or 45 minutes. Once that’s done it the inverter won’t pick back up until it reaches the float voltage of...

One thing about the JK. If it is rated for continuous discharge 200 amps, I’d believe that if it was in the open with a fan blowing on it. If it’s on the side of a box and it can do convection cooling I say 150 continuous. Enclosed 100 or less. There’s very little loss through the bms and it’s...

I think the new “inverter” JK has pre charge and many NEW built batteries now have it. I just don’t need closed loop when a 2 amp balancer can do it. Just one less thing to go wrong. It’s been a year and two months since the first two started and have zero balance issues even with a week or so...

Get in line about bad luck. I have proof that there is a god, because this much bad luck is statistically impossible. Just haven’t figured out what I did to tick him off.

Yes that’ll work but think about getting a disconnect/breaker rated for better than just 48vdc in the future.

Not using pre charge resistor (no pre charge circuit in bms) is very hard on the system. Many people have fried FETs ( shorted closed ) blown fuses, blown capacitors and damaged contacts. The inrush is incredible. The only time we don’t do it is with a charger, but there’s a sequence. My son...

Yeah. I’d open a mechanical disconnect, then enable the discharge in the bms, pre charge the inverter, now you can close the disconnect.