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Grounding

Easysolar II gx: solar array, fusing and grounding

Hi! I’m a bit of a solar energy newbie, trying to install a 5000w off-grid system. I’ve got the Easysolar II gx 5000 which has the MPPT 250/100 inside, 10 Trinasolar Vertex 505w panels and 3 Pylontech US3000c batteries. I thought it would be simple to connect but I’m struggling a little with the following question. Would greatly appreciate your opinion here!!


1. How do I best connect these panels? I now realise with 10 panels I bought a silly number. 2 parallel series of 5 panels exceeds the 250v limit (Vmpp 43,0, Impp 11,75, Voc 51,9 (- 0.25%/°C), Isc 12,35 (0.04%/°C). 5 parallel series of 2 panels leaves me with a very high current, probably needing a quite massive bar to connect them and thick cables (am I right here?). I’ve used the online calculator and it says 5x2 is okay though. What would you do? Or shall I rather put them as 3x3 and leave one panel off or buy 2 more and make 3 parallel series of 4 panels. This would potentially give me over 6kW PV array, whereas the manual says max 5.8kW, nevertheless the online calculator says it’s okay.


2. How do I fuse the system? So far my understanding is that best practices would be:

* One 20amp DC fuse (this is the panel’s max series fuse rating) for each parallel series of panels to avoid too much current flowing in from the other strings in case of short circuit.

* From there I lead the parallel series together and add a DC fuse/switch before going into the Easysolar. Am I correct in understanding it should be a 70amp fuse as the MPPT’s max PV short circuit current is 70A?

* Should I add a DC fuse/switch to the batteries? I’m off grid so I normally won’t want to disconnect the batteries unless I need to replace them. The manual says the recommended fuse is 200A, just for my understanding why would it be this high if the max output current is 100A?

* I will connect de AC out to my small house the house has a regular fuse box in place with a 32A main fuse and after this, several groups for the different areas with 16-20A fuses. I assume I don’t need to change anything here?


3. How do I ground the system? My house is grounded from the main fuse box, so every plug etc has a ground wire coming into the fuse box and one thick wire goes to the pin in the ground.

* Should I add a ground wire from the chassis of the Easysolar directly to the same pin?

* Should I add a ground wire from the chassis of the solar panels to the same pin?

* Should I add the ground wire in the AC out and where does it go? Should this be added to my house’s grounding system or should it replace it (ie instead of my house’s ground wire to the pin, I redirect it into the AC out of the Easysolar (and the Easysolar redirects it via the chassis to the pin??)

* Do I need to add any grounding to the batteries in any way?


Many questions, I know! I hope someone of you is kind enough to spend her/his precious time in writing me an answer and I also hope this may help others who may have similar questions. Thanks so much in advance!!

joeriwa asked
philippem answered ·

4 Answers

Raccordement à la terre Phoenix 1200VA

Bonjour,

Je souhaiterais savoir comment raccorder efficacement à la terre un convertisseur Phoenix 1200VA.

J'ai lu attentivement le mode d'emploi et parcouru pas mal de forums.

Ma maison est raccordée au réseau électrique public (schéma de terre TT) et dispose d'une assez bonne prise de terre (résistance = 6,8 ohm).

Le convertisseur sera utilisé dans une pièce annexe pour alimenter notamment un frigo durant la nuit (les batteries étant rechargées la journée grâce à des panneaux solaires). Je ne souhaite pas que quelqu'un puisse s'électrocuter en touchant un frigo si jamais celui-ci présentait un défaut d'isolation.

Donc, au moment où le convertisseur fonctionnera, le réseau électrique de la maison sera également en fonction et donc connecté au réseau public. D'autres appareils dans la pièce seront eux connectés au réseau.

Le manuel indique : "Cet appareil est un produit de classe de sécurité I (livré avec une borne de mise à la terre de protection). Le châssis doit être mis à la masse.".

Et plus loin, un schéma indique la procédure à suivre.

En suivant le manuel, si j'ai bien compris, je dois connecter le neutre à la masse/terre à l'aide du connecteur FJ2. Je dois ensuite raccorder le châssis du convertisseur à la terre de ma maison à l'aide d'un câble de diamètre approprié.

Et c'est là que tout s'embrouille dans ma tête. Etant raccordé au réseau, la terre de ma maison est liée au neutre du distributeur (via le transfo du quartier). Cela ne va-t-il pas poser un problème si cette même terre est en même temps liée au neutre du convertisseur? Comment vont réagir mes disjoncteurs différentiels en cas de fuite dans cette situation?

Je ne suis pas un expert en électricité. Mais est-ce qu'une même prise de terre peut servir à protéger efficacement deux sources de courant en même temps (le réseau public et le convertisseur)?

D'avance merci pour vos réponses et éclaircissements!

ludowan asked
ludowan answered ·

3 Answers

Fuses and Earth of the DC side of 3-phase system

Hello, how to understand the "It is essential the negative battery terminal between the units is always connected. A fuse or circuit breaker is not allowed" in the Multi II Manual? The interconnection between the units is meant? The BMS in error case disconnects the minus pole of the battery by N-MOSFETs, there is no way to do it in other way. And the DC terminals of the Multis see no difference (except of the stray capacitance) which pole is disconnected. Is it correct to earth the plus pole of the battery and insert the fuse and the DC switch into the minus line which can be interrupted by the BMS anyway? Thanks.

gigavolt asked
Alexandra answered ·

1 Answer

SPD Type II - Where do I put this thing?

I'm so turned around on SPDs. Do I need a breaker before the SPD off my panel (before controller). And 2nd question: My SPD has a ground receptacle. I'm running to earth and could hook it up but Wiring Unlimited states I should only ground my Batter Negative terminal and my controller chassis. (I'm not running an inverter).

adrianp105 asked
Alexandra answered ·

1 Answer

250/100 earth fault monitoring

Hi, Has Victron sorted an option for the earth fault monitoring of a mppt 250/100 ?

Assuming it would send a signal to a GX device for an email/alarm alert, or close the relay on smart versions, to be able to trigger an audible alarm?

Any options appreciated.


Cheers

eyrere asked
eyrere edited ·

0 Answers

DC ground fault protection

Hi guys. I am starting my new off grid solar setup and wanting to discuss safety with respect to DC grounding the array and MPPT.

I am using all Victron MPPT and separate inverter. I understand the requirements for DC grounding but within the USA there is a requirement for a ground fault fuse on the DC ground loop within the inverter.

Now I do not believe Victron has this built in as it will have to disconnect inputs and outputs if a current was detected on the DC ground loop.

So, I am wondering if its something I will install. I am not in USA so not needing to worry about the regulations there, but I do see a good reason for this GFP fuse as we do the same on out DC systems at work, disconnect ground if there is a DC current detected on the ground.

I was thinking a 1A DC MCB would be good but if a fault occurred, I would need to find a way to disconnect the PV from the MPPT. I could use a DC current detector and use a contactor to disconnect if greater than 1A was present.

This seems to be a good protection against a DC ground fault which could potentially cause a solar overheat and fire

What do you think, diagram of the US system attached

[image]

motorhomer asked
motorhomer answered ·

1 Answer

Motorhome earthing

I am installing a Victron Inverter VE Direct 12/800.

Should the inverter chasis earth be connected to the vehicle chasis?

iainr asked
cgogs commented ·

1 Answer

Liaison Terre sur Multi 48/8000

Bonjour,

Sur les Multi 48/8000 et 10000 il y a une barre de terre plus 3 x 2 connecteurs AC au lieu des 3 x 3 connecteurs habituels sur les 3000 et 5000.

Je pensais relier un câble depuis cette barre vers mon tableau mais je vois qu'il y a plusieurs boulons. Cela veut-il dire qu'il faille faire partir plusieurs câbles?

Merci pour votre avis.

Cdt

maa asked
dvb edited ·

11 Answers

Voltage problem between neutral and earth in battery operation.

Hello,


I have an old Phoenix multi 24V/ 1300W that still works. I have a problem with the neutral which generates current. I connected the phoenix to ground as well as the mppt. The phoenix is plugged into an isolated site without a generator or edf....


Should I touch J33 or something else...?


[image]

[image]


thank you very much.


Fabrice

fabrice asked
netrange commented ·

1 Answer

Problème tension entre neutre et terre en fonctionnement sur batterie.

Bonjour,

J'ai un vieux Phoenix multi 24V/ 1300W qui fonctionne encore. J'ai un souci avec le neutre qui génère du courant. J'ai connecté le phoenix à la terre ainsi que le mppt. Le phoenix est branché en site isolé sans groupe electrogene, ni edf....

Faut t'il toucher à J33 ou autre...?


merci beaucoup.

Fabrice

fabrice asked
fabrice answered ·

11 Answers

Multiplus II – Ground relay test failed #8 - Error 11 0x24

Hello everyone,

This device worked perfectly over the past two weeks and today it started dropping the AC loads.

This notification is displayed – “MultiPlus-II 48/5000/70-50 - #8 Ground relay test failed”

The VE.Bus Error report shows – “Last VE.Bus Error 11 report 0x24/Error occurred/GND Relay Error”

When I restart the Multi it produces the error right away. The bulk and absorption LEDs are also on.

Current firmware version is v471 (Multiplus II software version: 2623471)

I have done the following:

-Verified that AC-in GND is properly connected to grid earth.

-Tested for voltage between AC-in GND and AC-in Neutral. Ok - no voltage measured

-Verified that earth and neutral is not connected somewhere. All ok.

-Physically disconnected all cables from AC- out1 and AC-out2 to verify that there is no problems with any of the loads.

-Switched loads directly to grid via change over switches - all loads functions properly.

-Tested RCDs all ok.

Thank you,

Jean

jeanmc asked
energy commented ·

5 Answers

use of ground relay with a fixed installation

Hi.

With a fixed installation, i.e. one where the grid ground connection is never interrupted (unlike on a van or boat), is the use of the ground relay of a multiplus necessary?

Or should it be disabled in that case?

Thanks



jterrag asked
Kevin Windrem answered ·

3 Answers

Position of ground wire on Lynx Distributer.

Is there a good reason not to move the green ground wire from the centre of the distributer as shown on this circuit diagram down to the other side of the smart BMS where I’ve drawn a green arrow?

My Distributer is very congested with connections, and it would make my life a lot easier…

[image]

sweyn asked
sweyn commented ·

1 Answer

Thickness of Lynx Distributer green GND cable.

In this circuit diagram, what gauge cable does the green wire marked “GND” from the Linx distributer need to be relative to the various other cables?


Also, why?

[image]

sweyn asked
sweyn commented ·

1 Answer

Erdung der Inselanlage

Hallo Zusammen,

mein Setup:

- MPPT Smart Solar 100/30

- Phoenix VE.Direkt 800W/1500W

- 4 PV-Module mit Gesamt 600W

- 6 AGM Batterien, 12V, 120Ah. je 2 in Reihe für 24V und davon dann 3 parallel


Zur Frage:

wie relevant ist denn die Erdung? Im WR Manual habe ich gesehen, ich kann im Gerät zwischen Floating und "echtem" Ground umschalten.

Ich habe in der Nähe einen Brunnen, Material ist unbekannt und Tiefe ebenso, allerdings ist ca. 100cm unter der Erdoberfläche bereits der Wasserspiegel des uns umgebenden Sees (4m Abstand von Ufer zum Brunnen). Den hätte ich jetzt benutzt, um mindestens meine Modulhalterungen zu erden. Naja aber wenn das generell eine gute Sache ist und nicht zuviel Overhead bedeutet, dann würde ich das auch gern gleich richtig machen.

Wonach entscheide ich, ob ich das tun sollte (erden) und eigentlich unabhängig von der Antwort: Hat da jemand mal eine Skizze, wie das aussehen müsste in der Verschaltung?

Achso: das ist keine Anlage auf einem Boot oder sowas, lediglich eine Gartenhütte umgeben von See. Es gibt dort kein Versorgernetz und entsprechend auch keine "richtige" Erde.

Danke euch!

nats asked
nats commented ·

1 Answer

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