Need Help Sizing a Breaker for My Battery Bank

[fopoku2k2]

I have 4 12 v 200 AH batteries connected to give a 24 v system. I need help sizing the required breaker to be connected on the line from the charge controller

Thank you

[Amy@altE]

What is the size of the charge controller? For example, if it is 30A, it would be 30A x 1.25= 37, round up to 40A breaker.

[fopoku2k2]

What is the size of the charge controller? For example, if it is 30A, it would be 30A x 1.25= 37, round up to 40A breaker.

Cool. Thanks. It's a 50A charge controller. So I guess 63A would do?

[Sunking]

Cool. Thanks. It's a 50A charge controller. So I guess 63A would do?

No such thing as 63 amp breakers. Use 70 and make sure you rwire is sized properly to handle 70 amps.

[fopoku2k2]

No such thing as 63 amp breakers. Use 70 and make sure you rwire is sized properly to handle 70 amps.

Oh OK. Great. Thanks

[SunEagle]

Oh OK. Great. Thanks

Actually 63 amp is a standard breaker size over in China. A number of my projects list them as the Main breaker in a lighting panel with 16 Amp branch breakers.

But if you are in the USA as Sunking states the 63a does not exist and you must to with that 70a one.

[Sunking]

Actually 63 amp is a standard breaker size over in China. A number of my projects list them as the Main breaker in a lighting panel with 16 Amp branch breakers.

Does not surprise me one bit.

[SunEagle]

Does not surprise me one bit.

It confuses the heck out of me when I have to review single line diagrams with OC devices that are not US standard.

[Sunking]

It confuses the heck out of me when I have to review single line diagrams with OC devices that are not US standard.

Those are the jobs I over bid so I do not get the contract. Better yet and less expensive, throw the RFQ in the garbage can.

[fopoku2k2]

Actually 63 amp is a standard breaker size over in China. A number of my projects list them as the Main breaker in a lighting panel with 16 Amp branch breakers.

But if you are in the USA as Sunking states the 63a does not exist and you must to with that 70a one.

I'm in Ghana, West Africa and we have 63A breakers on the market here. I think they are also used in the rest of Europe

[Amy@altE]

63A DC is a standard DIN Rail breaker size in the US from Midnite Solar. http://www.midnitesolar.com/productP...Order=18&act=p

[SunEagle]

63A DC is a standard DIN Rail breaker size in the US from Midnite Solar. http://www.midnitesolar.com/productP...Order=18&act=p

Maybe that is the difference. Those are "din rail" mounted where wires are connected to both sides and the other "standard" US breakers have only one wire connection where the Line side is "bus" connected.

I use to use a lot of Allen Bradley din rail mounted CBs in my PLC systems. Although they never got bigger than 10 amps so I never compared them to lighting or distribution panel branch breakers

[fopoku2k2]

So does this mean I was finally right for once? Can I do the victory dance now?

[Sunking]

63A DC is a standard DIN Rail breaker size in the US from Midnite Solar. http://www.midnitesolar.com/productP...Order=18&act=p

Made in ??????

As an engineer I do not see the point is such incremental sizes. If calculations say 63, 60 or 65 works just as good. Electrical Engineering is like this:

We measure our wood to cut with a Micrometer.
We mark the wood measurement with pavement chalk.
We cut the wood with a Lumberjack's axe.

Makes me think some manufactures cannot see the forest for the trees.

[russ]

Makes me think some manufactures cannot see the forest for the trees.

One thing in life is guaranteed - whatever the US does the EU is against and will do differently.