u/Rocketman500000

Hi Guys,

I think as has happened with many in the past, I’m struggling to confidently spec my MultiPlus cabling

In in the UK btw

As you can see in my detailed schematics, my MP is in my shed and connected with 6mm2 cables

In only planning to use the AC-In terminal so a simple set up.

I had thought that using 6mm2 cables protected with suitable Bi-Directional RCDs was ok, however when you search the web I often come back with AI search results labeled as coming from a Victron origin dating that 10mm2 or even 16mm2 is the necessary AC connection cabling…. That has made me concerned that my 6mm2 is under sized.

Anyone able to assure me a 6mm2 feed on a 20a breaker is ok?

And my second question, and I suspect the harder one….. My Chinese Mason Seplos battery is 16kwh… what size earth cable (see the “?” on the drawing) is needed between battery and MP (I’m happy to match the DC cable size if necessary, I just need a firm answer as again AI says different things daily)

And my final question - Is the earth running (as seen in the beautiful schematic) from the MP to shed CU, then shed CU back to the main house CU sufficient… Again, Some AI suggests I need to match the DC battery cables for this too, which is crazy since that would be a 70mm2 earth cable about 20m long!! $$$

Any help much appreciated

I know I’m gonna get blasted for asking this… feel free to hammer my question with a response like “get an electrician etc”, but in addition to those reply’s I usually get really helpfully responses from a few awesome dudes so fingers crossed they’re reading 🤞 🙏

I’ve pretty much finished my 8 panel, 1 x 3.68kw Inverter and 16kwh battery install…

I’m just struggling to get a solid / trustworthy answer on how to earth the kit in the image safely

All the gear mentioned above inc the solar panels are in/on my garden room which has a new (professionally installed) secondly consumer unit on a 6mm2 cable from the main house CU.

The inverter shown at the top, has a 6mm feed from the shed CU and is on a bi-directional RCBO, so does have an earth via that cable.

I’m now trying to work out if it’s safe, to fit an earth block near the inverter and run separate 6mm earth cables to the Solar panels on the roof, the MPPT controller and the 16kwh battery case.

If I need a thicker than 6mm earth cable from the solar kit back to the main house CU it’s a massive job, so hoping 6mm earth is ok but obviously not gonna risk anything dangerous…

🙏 Cheers guys

Hey Guys,

I’m planning to fit 8x panels to my garden room in the UK…. Similar to the image here.

I’m just trying to work out how to block off the open edges (the 2 sides where I do t have the frame rails), since these will be big enough to let birds etc in..

A nice and neat solution would be great….

I’m aiming to mount the panels tight to the rubber roof, so only 30mm gap under the panels if that affects what I use to block the gaps…

I think whatever I use to block the holes should allow air through since it’ll be the main ventilation points

Any suggestions very welcome

Many thanks 🙏

Hey Guys,

I’m getting close to finishing off my Grid-Tied 4kw Victron Solar and 16kwh Battery system..

Apart from the Inverter connection to the house distribution board I’ve DIY’d it all.

I think I’m sorted generally cabling-wise as had assistance specifying bits from my solar equipment seller, only thing they aren’t happy helping with is the earth/grounding side of things..

I’m looking for clarity on how the Inverter/ MPPT/ Lynx Distributer and the battery unit get safely grounded.

Also, which gauge of cable to use for those earth links

From my research I believe it’s pretty straight forward, with all the devices earth terminals needing to be bonded together to share a common ground…with the overall grounding coming from the inverters earth cable running back to my mains electrics distribution board.

That same earthing link also connects to the negative DC bus bar on the Lynx Distributer… PLEASE DO TELL ME IF IM WRONG! ?

But… the cable gauge mentioned in some info is suggesting using cable slightly thinner than the main battery DC cables (mine are 70mm2), so for the earth use something like 50mm2.

I don’t mind spending the money of using 50mm2, but all the images I see of this kind of kit installed it looks like people are using a much smaller gauge like a 6mm2 or similar so I’m a bit confused.

Any help much appreciated

Hey guys,

Trying to safely link a Multiplus 48/5000 to a Mason Seplos 16kwh 48v battery via a Lynx Distributor…

Multiplus manaul says 70mm2 DC cable, but the Mason says 50mm2

Seems best to go with the larger, so 70mm2 from Multiplus to Lynx, then 79mm2 again from Multiplus to Mason right?

Only issue is the Mason DC terminal can only accept max cable gauge of 50mm2!

So now I’m going round in circles on what to do.

(1m runs from Multiplus to Lynx, and another 1m from Lynx to Mason)

Any advice much appreciated