Growatt N-G confusion

[MT off grid]

When you disconnect DC, there's an arc that must be quenched. The breaker is only designed to do this in one direction. (Battery is line)

 

[timselectric]

That's good to know, really wish the breaker had the DC info listed, seems lots of companies sell this but not a bit skeptical since never seem a AC/DC breaker

Several breakers are dual rated. You just have to verify the ratings for your use.

 

[MT off grid]

I have read through the spec sheet that signature solar has posted under this breaker and I don't see anything that says DC, lots of info I don't understand so I guess it could be listed somewhere.

Nader DC Circuit Breaker | 48V 125 Amp

Signature Solar provides solar panels, off-grid solar systems, grid-tie, and hybrid systems. Quality solar inverters, bifacial solar panels, complete solar kits, solar batteries. Featuring brands such as EG4 Electronics with their solar battery, LifePower4 and EG4 LLifePower4 and EG4 LL

signaturesolar.com

 

[MT off grid]

Several breakers are dual rated. You just have to verify the ratings for your use.

 

[MT off grid]

So I just did some reading, seems that ppolarized breakers are only safe in one direction, if using an all in one inverter like growatt then this breaker should not be used because When charging the breaker will not extinguish a spark/flame. Now not am I more confused but also frustrated that I can't seem to find a good breaker for my AC in

 

[timselectric]

So I just did some reading, seems that ppolarized breakers are only safe in one direction, if using an all in one inverter like growatt then this breaker should not be used because When charging the breaker will not extinguish a spark/flame. Now not am I more confused but also frustrated that I can't seem to find a good breaker for my AC in

Charging amps are far lower than fault amps available from the battery. And that isn't a polarized breaker.

 

[MT off grid]

Charging amps are far lower than fault amps available from the battery. And that isn't a polarized breaker.

 

[MT off grid]

OH it's not? I thought the line and load markings meant polarized

 

[timselectric]

Line and load identified is directional.
Positive and negative identified is polarized.

 

[MT off grid]

Line and load identified is directional.
Positive and negative identified is polarized.

 

[MT off grid]

So this nader breaker should be safe to use? I have a midnight solar breaker for my solar in, guessing it is polarized

 

[timselectric]

Yes
And
Correct

 

[MT off grid]

Yes
And
Correct

 

[MT off grid]

Okay, I will wire it in, I really appreciate all of your help, your good at getting confused people straightened out, thought I knew basic electrical but then I started into DC stuff and it's a nutty world

 

[MT off grid]

I cant mount the breakers properly and keep my positive and negative cables the same length, unfortunately I can't mount the breakers horizontal so probably need to go with fuses like my original plan was, I liked the option of multiple trips but looking like a 110 amp gopower class T os my only option if I want to keep my wires the same, so frustrating and irritated right now

 

[MT off grid]

Yes
And
Correct

 

[MT off grid]

If I go with class T fuses would I go with 110 amp? Go power has the best prices but the literature says to use a 200 amp for inverters ranging from 3000-5000 at 48 volts, I'm thinking the 100 amp class T is more then enough. Am I missing something on the 200 amp that go power says?

 

[timselectric]

I cant mount the breakers properly and keep my positive and negative cables the same length, unfortunately I can't mount the breakers horizontal so probably need to go with fuses like my original plan was, I liked the option of multiple trips but looking like a 110 amp gopower class T os my only option if I want to keep my wires the same, so frustrating and irritated right now

Positive and negative cables don't need to be the same length. Same length only matters with parallel cables.

 

[MT off grid]

Positive and negative cables don't need to be the same length. Same length only matters with parallel cables.

 

[MT off grid]

I thought the battery cables needed to be the same length when you use 2 inverters , something about current sharing, I will read the annual again but it says something about keeping all battery cables the same length