Lynx Distributors

DIY
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1

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Good day, I am seeking validation for my design around the lynx distributor. I provided a pair of the lynx distributor to our installer and he is only using one. Therefore, I created the design to share with him based on what I read about the distributor and would greatly appreciate any feedback around my understanding of the lynx distributor.

Thanks in advance

2

So if you have:-
3 batteries
3 inverters
1 dc mppt?

That is a 7 connection bus bar if they are individually connected with 1 cable. There fore 2 x lynx distributors.

Its not immediately obvious what you have connected there, or why they are connected like that.

But the basic math is easy. If you share what you components actually are in your system. And basic flow. The wiring digram is not the best way if you are wanting to illustrate something.

3

Thanks for your response,

The MPPT is integrated (1 x MPPT for each inverter) so there are only six connections.

I would like to have all the Batteries in parallel and the recommendations was to use a bus bar. What’s the recommended way to connect 3 batteries in parallel based on Victron best practises?

4

I personally prefer individual connections of everything to the bus bar. All the systems i have done like that have way less issues.

So 3 mppts 3 inverters, 3 batteries. 9 connection.

5

Technically, your battery is 96VDC the way you’ve drawn it. The negative would be 0VDC not -48VDC

Its really confusing to also use black and red for the AC wiring, also since the actual inverters are not drawn. I suggest using the IEC coloring for AC, using light blue for Neutral and Brown for L1, or White and Black if your in the US, Canada or Japan. Or at least something different than what is used on DC.

I personally would also ground the negative side of the DC system, but this could be argued about, whether you want a SELV or PELV system.

I would be cautious about disconnecting both positive and negative conductors. At least they are both switched in the same MCB here. Communication wiring is not always isolated, so the shield of an RJ45 cable could allow for a return current to flow over it should only the negative get disconnected.

Since you plan to use MCBs on every connection as well, you could have also used a Lynx Power-In instead.

I think, alternating the inverters and batteries on the busbar is a good practice. This way, at least in theory, theres no current traveling all the way through the busbar. In reality some compensating current will flow from one inverter/battery pair to another, but thats negligable.

6

Currently, I only have the batteries, so my understanding based on what you said, I would have inverter, battery, and PV array on the bus bar? If that is the case I would need 12 and not 9 because I would have from the array to the bus bar and from the bus bar to the inverter integrated MPPT. But I believe this will be risky because it would exceed the MPPT max VDC. At least this is my understanding

7

Thank you very much for your detailed response, here in the Philippines, at least for the properties the electrician use one colour for every (L/N). The Philippines Electrical Code have red for line and black for neutral but I would change it for more clarity.

Regarding the 96v, I’m glad that I asked because I’m thinking with the use of the busbar the battery would be in parallel and the volts will remain 48v and the current will increase. Would you be able to elaborate on why it would be 96v with the bus bar?

I’m using MCCB for all OCPD as it has better protection for high current.

I did not ground the battery neutral because I would have two bonding points since in already bonding at the service disconnect. Both AC and DC are using a common grounding station. The inverter manages the bonding also when it’s operating from the grid or from the PV array and batteries.

8

No the pv is connected to an mppt. The mppt (if it is dc coupled) is connected to the bus bar (or in your case the dc terminal of the inverter). Which is why i was saying it’s helpful to know what equipment you have. Otherwise confusion and guessing will happen and then disaster.

But if you have an easy solar or a multi rs then it is just the inverters connected to the bus bar as the mppts are already integrated.

Work on the power flow first, then add switchgear etc.

Is it a three phase system? Parallel, ess?

flowchart TD

    %% PV Arrays
    PV1["PV Array 1"]
    PV2["PV Array 2"]
    PV3["PV Array 3"]

    %% EasySolar units
    ES1["MultiRS 1<br/>Integrated MPPT"]
    ES2["MultiRS 2<br/>Integrated MPPT"]
    ES3["MultiRS 3<br/>Integrated MPPT"]

    %% DC Bus
    BUS["48V DC Busbar"]

    %% Batteries
    B1["48V Battery 1"]
    B2["48V Battery 2"]
    B3["48V Battery 3"]

    %% PV to EasySolar
    PV1 --> ES1
    PV2 --> ES2
    PV3 --> ES3

    %% EasySolar to Busbar
    ES1 <--> BUS
    ES2 <--> BUS
    ES3 <--> BUS

    %% Busbar to Batteries
    BUS <--> B1
    BUS <--> B2
    BUS <--> B3
9

Thanks for the details once again, I have 3 x Pan Power inverters and the connection is single phase L+N. The batteries are 15kWh LFP4 and the only product from victron are the pair of lynx distributors. But for my remaining projects will try and import victron inverter/charges and everything else since these are not available in the Philippines.

10

On your drawing for the battery you drew +48V and -48V. The negative terminal is 0V. Your set up will not make 96V, it is your drawing that is wrong.

11

Silly but ok. In this case i would change the colors of the DC side. Different colors are used to differentiate function. Way too easy to mistake a DC wire with an AC wire when everything has the same color.

Its only wrong on the schematic, +48VDC and -48VDC means a total voltage of 96V.

Just change the -48VDC to 0VDC on the schematic and its fine. You battery wont have 96V in reality.

Thats for the AC side i suppose

Only on the AC side. If you dont bond the battery side to ground, then it wont be bonded, not by the inverters, not by the batteries. AC and DC side are fully isolated from eachother. But again, it works fine without, the difference is simply whether the DC side is a SELV or a PELV system

Edit:

So in this case there might be no isolation between AC and DC, or the DC negative is bonded in the inverter, i dont know this type. I assumed you were using Victron inverters, but here things might be different

12

Ah okay, I just used the default battery from QElectroTech for the drawing I have created an element that shows BAT+/Bat

image
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13

Yes, you are right, it is the AC side.

Thanks for the clarification regarding the AC and DC isolation, I will double check with the inverter manufacturer regarding the DC side and bond the DC side from the Lynx Distributor if the inverter is not already doing this to avoid having multiple DC bonds. I have also updated the drawing and decoupled the AC from the battery DC side.