High capacity DC breakers

[Sea Change]

I'm soon going to be re-organising my lithium system, as I double it from two to four 280Ah batteries.
This seems like a good time to revisit a few things. At the moment, I have MRBF fuses on each battery, then a class T master fuse.

A few weeks ago WIll Prowse was singing the praises of DC breakers. This is the sort of thing he was talking about:
https://www.amazon.com/DIHOOL-Circuit-Breaker-Disconnect-Switch/dp/B0CJBB6J5D?ref_=ast_sto_dp&th=1

If the specs are to be believed, they could function as both a fuse and an isolator. I would maybe keep my class T master fuse in place as well.

These things are very chunky, but otherwise I'm not sure I see a reason not to use them? Unless they're actually Chinese rubbish and not to be trusted, of course.

 

[Boater Sam]

Chinese but how would we know if they were rubbish? Dihool is a big company making lifts and lots of sophisticated engineering products established in 2019 from its parent company, a taxi firm!

 

[Alex_Blackwood]

I'm soon going to be re-organising my lithium system, as I double it from two to four 280Ah batteries.
This seems like a good time to revisit a few things. At the moment, I have MRBF fuses on each battery, then a class T master fuse.

A few weeks ago WIll Prowse was singing the praises of DC breakers. This is the sort of thing he was talking about:
https://www.amazon.com/DIHOOL-Circuit-Breaker-Disconnect-Switch/dp/B0CJBB6J5D?ref_=ast_sto_dp&th=1

If the specs are to be believed, they could function as both a fuse and an isolator. I would maybe keep my class T master fuse in place as well.

These things are very chunky, but otherwise I'm not sure I see a reason not to use them? Unless they're actually Chinese rubbish and not to be trusted, of course.

How much current are you going to be taking through each breaker? Do you really need a 200 amp breaker(s)? Maybe have a lok at what's available in the solar worled. Look for PV circuit breakers, then if worried about reliability of the units, purchase from a good solar firm.

 

[Sea Change]

How much current are you going to be taking through each breaker? Do you really need a 200 amp breaker(s)? Maybe have a lok at what's available in the solar worled. Look for PV circuit breakers, then if worried about reliability of the units, purchase from a good solar firm.

Each battery has a 200A BMS. I run a 300A master fuse.
The main load is the 3kvA inverter.

 

[Boater Sam]

Each battery has a 200A BMS. I run a 300A master fuse.
The main load is the 3kvA inverter.

Well there is your 300A including surge.

 

[PaulRainbow]

And people wonder why insurance companies are insisting on pro installs only.

 

[Sea Change]

And people wonder why insurance companies are insisting on pro installs only.

I take it you think these are unsuitable. That's all you had to say.