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Battery disconnect

C

ChillnGrill

Solar Enthusiast
Joined
Dec 11, 2022
Messages
228
Location
Sopchoppy, Fl
Having trouble finding a disconnect that will fit 4/0 lug for my system.
2 sets of batteries, 6 lifepower4, 3 more lifepower4 with 4/0 cable to each set.
1 power wall outdoor this one has 2/0 cables. this one is not the problem.
Need any recommendation. Thanks
 
I just bought two of these for my project -- still in execution, so no real world experience yet My 4/0 lugs fit fine. And Peter Kennedy has great prices and great service. My understanding (I hope I'm right!) is that these can be remotely controlled, both on and off, by my BMS. However, a major plus for me, they can also be manually overridden in both directions -- so I can turn it on even if the BMS says "no" and I can turn it off for service.
 
Normally I stay away from Chinese breaker but I have found these to be fairly good.

Single pole 250A model I bought four of measured 0.43 to 0.45 milliohms series resistance. Cable terminal lug hole bolt is 8 mm (5/16") diameter with Allen head for bolt.

They are quite beefy, and toggling takes a bit of strength.



You get them on Amazon with quite a markup in price.

1735259603381.png1735260034228.png
 
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RCinFLA said:
Normally I stay away from Chinese breaker but I have found these to be fairly good.

Single pole 250A model I bought four of measured 0.43 to 0.45 milliohms series resistance. Cable terminal lug hole bolt is 8 mm (5/16") diameter with Allen head for bolt.

They are quite beefy, and toggling takes a bit of strength.



You get them on Amazon with quite a markup in price.

View attachment 265720View attachment 265726
Click to expand...
I looked at those but they won’t fit a 4/0 lug. Wish they did.
 
If you will NOT be switching under load:
www.homedepot.com

Siemens 200 Amp Lever-Bypass Overhead/Underground Meter Socket Stainless Steel Hasp RH173CRF - The Home Depot

Visit the Home Depot to buy 200 amp Lever-Bypass Overhead/Underground Meter Socket RH173CRF
www.homedepot.com

Rated for 120/240v, which is more than enough to handle 60v dc. But, the 200a breaking ability assumes AC, which goes to 0v 120 times a second. If you will not break under load (few amps ok), then it will work. I would not trust it for an emergency cutoff.
 
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This question gets asked with some frequency and from what I've seen it always plays out pretty much the way it's playing out here. There just isn't that many options, particularly when you start looking at the AIC ratings required when LFP is involved.

I use CarlingSwitch and Heinemann breakers but I've also seen mention of using Kilovac relays.

batteryhookup.com

TE Connectivity EV200AAANA 500a 0-900vdc Tyco 12/24v

These were recovered from EV battery modules. These are VERY EXPENSIVE online. If you have any project that needs a high current relay this is your chance to save some money. Make a cheap 30a BMS into a 500a BMS. This will work for batteries in the 9-36v range so perfect for Lifepo4 and Lithium...
batteryhookup.com batteryhookup.com
 
Last edited:
RCinFLA said:
Normally I stay away from Chinese breaker but I have found these to be fairly good.

Single pole 250A model I bought four of measured 0.43 to 0.45 milliohms series resistance. Cable terminal lug hole bolt is 8 mm (5/16") diameter with Allen head for bolt.

They are quite beefy, and toggling takes a bit of strength.



You get them on Amazon with quite a markup in price.

View attachment 265720View attachment 265726
Click to expand...
I was also eyeing this one , the nanque does have a electromagnetic disconnect @B curve , unlike the others with only thermal disconnect @C Curve. and CE certification and provided warranty.
 
Check ebay for those too - I got my boxes for cheaper from a seller there a while back.
 
perfect! I'm not about to spend $425 for the midnite enclosure!

I'm assuming you just cut/drilled the box to fit the breaker mount
 
x98myers7 said:
perfect! I'm not about to spend $425 for the midnite enclosure!

I'm assuming you just cut/drilled the box to fit the breaker mount
Click to expand...
Was that the 500A combiner box?

The midnite dc disconnect enclosures include one ot two mnedc breakers so that's part of the reason they get up there in price.
 
x98myers7 said:
perfect! I'm not about to spend $425 for the midnite enclosure!

I'm assuming you just cut/drilled the box to fit the breaker mount
Click to expand...
I felt the same way and yep I just cut out a slot with my dremel tool for the breaker. Thing is built like a tank and heavy.
 
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