Double pole disconnect DIY battery box?

[andyP]

I'm looking for a 48v DIY battery box which has a double pole isolation switch built in.

According to regs and inverter instruction, there should be a switch and fuse on both positive and negative between the inverter and the battery. I've seen most have a single pole switch, and Yixiang has a double pole switch but from what I've seen, inexplicably both poles are connected to the negative. Weird!

But is there another DIY kit out there with a double pole disconnect switch that will save on the ugliness and expense of a bulky isolator switch. Seems like an obvious thing to include.

 

[OzSolar]

It does seem like an obvious thing but I also don't think you're the only one that struggles with this. Hopefully now that I've bumped this post others will be along with better replies.

I've seen some things like what you are asking about on Alibaba and AliExpress.

Ignoring that you asked about a 2-pole breaker and that the AIC rating may be insufficient something like this is starting point for just the breaker.

187-Series - Blue Sea Systems

Thermal circuit breakers provide heavy duty circuit protection for 25 to 200 Amp loads when switching and circuit protection are both required.

www.bluesea.com

 

[wpns]

Yixiang has a double pole switch but from what I've seen, inexplicably both poles are connected to the negative.

Conceptually putting switch contacts in parallel doubles the current rating.

I suppose you could use a high-current breaker (dunno, 1000 amps?) as a switch and let the fuses take care of the OCP function.

 

[xoxlol]

You mean halves the current requirement, right?

 

[ocular]

A good quality 2 pole MCCB (BENY, NOARK) costs AUD $200+ and are physically bulky. The cost and physical size are probably the reasons we don't see them in the DIY box kits.
These are the Beny specs, but is an AIC of 15kA adequate for a 16S 15kWhr 51.2V LiFeP04 pack?