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I planned to parallel E & W sides through a single MPPT. Theoretically, they are working at different times of the day.

In June 2021 there was a news article about Longi achieving the best bifaciality factor of any panel. I believe this was related to commercially available panels, not laboratory achievements. At that time, I had some professional calculations done. I anticipated the bifaciality factor would...

Even at 200A it will take some time to trip. If you can manually operate the switch successfully in both directions at 30A, it is bi-directional and you have done due diligence. A uni-directional MCCB/MCB will not survive that. As for establishing the current threshold tolerance, well do you do...

Stick a knife or hacksaw blade alongside it. If there is a magnet inside it, there is no need to test, it isn't bi-directional. You won't need 160A to test it if it isn't bi-directional. It won't be able to break much less than that ( in the wrong direction) if you just manually switch it. Just...

BMS capacity aside, and assuming all cells are healthy. I think you would get away with paralleling an old cell with a new cell at a cell level, as opposed to parallel strings. ( with a single adequately rated BMS). If you were to run things as parallel strings then a second BMS would be needed...

Maybe, maybe not. It depends on several factors; it is a risky assumption. Indeed dangerous with a directional DC MCB.

So is that just a bunch of huge capacitors across the battery? They look like they are series instead of parallel; what was the rationale behind that?

Sorry gents, I have missed this lively discussion for a while. The MCBs I tested were from a company called YRO. I tested them actually to trip for overcurrent conditions, and they don't have any magnetic attractions or repulsions. Other than that, I have no affiliations and make no guarantees...

I have also considered using a DC generator as a solution. This is what I may try when I get around to it. A 96V DC generator through an MPPT. I think that way, the DC voltage can vary, and the MPPT can fine-tune the voltage to the desired charging stage. I haven't shopped around particularly...

My system has expanded over the years, but if I recall correctly, once I got a Venus device and a BMV shunt, that VRM even reported the total DC from the Outbacks. I had to enable the "has DC system" setting in VRM or something like that. As I said, there have been various expansion stages, and...

I ran 4 x Outbacks Mppts without any shunt or Venus device in the system on a Victron Phoenix for at least two years. There was also no comms between the Outbacks. I just used the same settings on each of them and all worked away independently.

You'd do well to notice these symbols on your switchgear: They are important to identify what equipment is rated for what purpose. Note: Not all switches are rated to break load current and not all circuit breakers provide adequate isolation.

There will be no current in the circuit to start a fire if the first half does its job. But like I said prove it by testing, don't take some random guy's opinion over the internet when your house could burn down.

I am in Ireland, but my self-installed scheme is in another country. I don't have any personal knowledge of Irish installers, other than the general knowledge that if you choose to avail of a grant they must be SEAI-approved.

Yes, half the unit will do the job regardless of the current direction. A different half depending on the direction of the current.

As much as I like Victron I don't think it is approved on the SEAI Triple E register.

A non-polarized MCB doesn't use a magnet as far as I know.

Two things: There will be regulations and approved inverters that you will have to comply with. Think about having twice or more as many panels for the same output as people talk about in sunnier climes.

I'll relate my experience... I bought sample MCBs from China also with the same non-polarized description, but also with the same + and - markings. A 32A and a 125A sample. I corresponded with the salesperson about my suspicions and we came to an understanding that I would test them and if they...

Yes, using the same principle 1 leg has to be unconventionally wired. But test it, you don't want to be second-guessing a manufacturer who has already second-guessed the consumer and made a non-polarized MCB.

No, you are still giving it conventional current directions. Take it out of the bottom left pole terminal and loop it into the top right pole terminal.

How do you wire it right as a 2 leg ( + & -) MCB bi-directional current setting?

Yes, you have ample voltage capability. Technically, so long as the wiring is adjusted accordingly it doesn't matter which leg the break is in. From a conventional point of view, the break will be expected in the positive leg.

Watch the video, which is only at 10 Amps.

Yes, what I am saying is that one magnet will always be correctly orientated to break the arc regardless of the current direction. The caveat is that the voltage rating of the MCB ( which usually has two breaks) should be at least twice the circuit voltage. So that one break can still withstand...

A polarized MCN contains permanent magnets. As you know like poles repel. In a nutshell, the DC arc current also represents a magnet. If it is a like pole it is repelled into plates which stretch it longer until the arc breaks and is extinguished. If the DC arc current is in the wrong direction...

Not all, but a lot of them.

Fuses offer bi-directional protection and can be withdrawn and used as points of isolation once there is no load current flowing. A polarized DC MCB cannot be used to even break load current in an application where current can flow in either direction wired as shown. So it is unsuitable for your...

There are 3 discrete labelled contactors on your posted diagram. I think you should reconsider whether or not you are out of your depth.

Yes, you need suitably rated contactors ( like the Kilovac EV200 range for the charge and discharge contactor circuits resp.) and a smaller contactor (or SSR) in series with say a 200ohm 20W resistor for the precharge circuit.

@ko6kL "2x44v in series for the morning" Unless I am mistaken the FAZ-B6/1 MCB is only rated at 60Vdc/pole.

I think the photo is a bit misleading, it looks like the negative is going into the Earth, but looking closely it isn't.

Your surge arrestors seem to be going to negative and not earth?