Thank you. Found here in same boat...Great point to show ac has a zero point vs. Dc. Great video.

Thanks COOP ...

I was looking for a video like this! Thank you I needed to understand when I heard the word polarity on DC breakers, had no idea glad I know now!! PEACE!

So if I want to use this as both a fuse and a cutoff on the output of my battery charger to my battery, the red wire on the charger goes in the ++ and then comes out the - - to continue on to the positive terminal of my LiFePO4 battery. I hate polarized DC breakers but the non-polarized breakers are both difficult to find and expensive when you do find them.

The polarity is important when wiring these. However, the second and fourth breakers in that collection are the same as the first and the third. This means that the current when it’s looped around the top is now going through the breaker backwards as compared to number one and number three. This is in the direction that it’s supposedly not meant to stop. And more importantly, can cause a fire. No I’m not saying that happens. I’m saying that I don’t understand it.

Did I miss the part where you talk about the two brown wires?

@dusthavendotcom

2 жыл бұрын

I didn't mention them because I'm not using them. From the research I did they are remote trippable switches. I *think* some degree of current is supplied which will trip the circuit for remote purposes and allow it to be used for a shutdown of sorts. MidNite Solar really anticipated these to be used in side of their hardware so there's not a better documentation source that I've been able to find.

@callmeburton

Жыл бұрын

@@dusthavendotcom Thanks I had a thought that is what they would be used for as well ... MN does have several products which would allow for this. We have three of these 600's going into one of their 12 slot boxes with 3 SPD's to feed our SMA SB 7.7 so wanted to figure out the extra wires before commissioning it :D

I miss the double break . Or. 2 polar most seen in off grid installation. So for the negative you will go from + polairy from load end to -for battery side. Just saying you are going more negative whwn following the circuit

So how to use this between the inverter and the battery where they both are high potential and low potential in the same time/day/night

@dusthavendotcom

2 жыл бұрын

I don't think the inverter would ever be higher voltage than the battery; it's a load that (without the batteries) is consuming amperage not producing it at all. I don't think there would be a source of current on the DC circuit from the inverter to the batteries.

@arafetkanso1405

2 жыл бұрын

@@dusthavendotcom So what do you call "charging" ? higher potential from inverter to lower potential in batteries ... then at at night the current runs in reverse so the batteries become the higher potential , sorry i am still confused

@dusthavendotcom

2 жыл бұрын

@@arafetkanso1405 No worries! Your solar panels should never become a load, using electricity. In a solarinverter/charger situation there should never be appreciable current going back towards the panels. You can see it yourself if you look at the voltage at the terminals of the inverter/charger at night time; there's likely to be next to nothing (except star or moonlight).

Hello my friend and thank you very much for your very informative video. I watched it all with caution but then at some point i lost it. Its many days now im trying to find out how to connect my one pole polarity sensitive dc circuit breaker (Kripal UKB7Z-50/1/C20) between my Victron Mppt charge controller output and the battery on the positive wire (since its one pole). The Mppt controller has a max output of 15amps when is in bulk charging. Should i consider the battery as a load and put the plus (+) symbol on the side of the controller and minus (-) symbol on the side of battery ? I dont think that the battery (12v 150ah) can return voltage back to the charge controller even when solar panels are not producing energy at night but again i need to be 110% sure how to connect this braker because im not expert and as you already know nasty things may happen if i do it wrong. So any help from your side would be really helpfull for me. Thank you .

@dusthavendotcom

2 жыл бұрын

Hey Peter. If I'm understanding you correctly, the only way current should be traveling between a charge controller and a battery is from the charge controller into the batteries. The batteries should not be pushing current into the charge controller. I would put the ++ side of your breaker on the charge controller's output, and the -- side on the batteries. Your victron charge controller, and probably your panels, should have diodes in them that would prevent current from going backwards (from the batteries to the charge controller).

@petertomas3665

2 жыл бұрын

@@dusthavendotcom Thank you very much for your opinion. I have some second thoughts thou because maybe the controller has diodes but as i red to some solar forums some people mentioned that in case the battery create a shortcut inside the battery or if controller gets damaged by some reason then many thousands of amperes will return to the controller. So they say that in the battery circuit with controller we put always the ++ at the battery side to prevent the huge amps return to the controler in case of failure. So yeah, and after all that i red somewhere else that specifically in the circuit of the battery and controler we put a circuit breaker that is non polarity sensitive. So, guess what i will do. I will install just a simple fuse lol. Thanks again !

@petertomas3665

2 жыл бұрын

@@dusthavendotcom Hey mate check this out what i found ! Watch at 4:25. I think it gives good answer since they are the makers of those circuit brakes. Cheers. kzread.info/dash/bejne/f6illcWsaarbk8Y.html

Thank God I saw this video. Bought 8 of these things to use as switches in lieu of isolators, to be able to shut off my 8 solar arrays when working on the system. By system I mean a bunch of equipment that I haven't installed yet. Do you know if anybody is selling the "polarity insensitive" ones yet that you mentioned coming out? I could use two more of these between my inverter/chargers and my battery bus, but since the inverters can pull from the batteries or charge them, I'm assuming that would be a textbook case of fire hazard due to the polarity sensitivity.

@dusthavendotcom

Жыл бұрын

I haven't checked the market in a bit so I can't say in regards to new availability. But your read on the situation sounds accurate. Between the combo inverter/charger and the batteries the flow can go either way.

@fauxque5057

4 ай бұрын

I was going to install a single DC breaker in the positive line from the inverter to the battery bank but have the same question. Since it charges and discharges, at some point wouldn't that be reversing polarity? Maybe I would be better off with a disconnect that doesn't have a breaker.

High freq All-in-One inverters and 'transformer-less' GT inverters do not isolate their PV inputs from AC output so both PV pos and neg terminals are riding on top of AC output. You need to have the double pole DC breakers, breaking both pos and neg lines, to remove AC from panels.

@dusthavendotcom

2 жыл бұрын

For sure. I think single pole breakers like this are really for between a solar array and a controller where you can be sure of the current direction unless something very bad is going on.

To be honest i tired to listen. It is possible to fir everything in few minutes.