New Multiplus RS Solar + Pylontech --> all in one 19" rack

[PaoloBn]

Thanks to the high integration level of the new Multiplus RS Solar, this is a fully off-grid power system designed to fit a single 19-inch, 42U rack tower.

Main components

• N.1 Victron Multi Rs Solar 48| 6000 |100
• N.2 Pylontech US5000
• N.1 Victron Cerbo GX
• N.1 Victron GX Touch 70

Key Features

• Minimal wiring thanks to the integrated architecture of the new Multiplus RS Solar (no external DC bus bar required).
• All in one system with DC string box and protection, AC box and generator input
• Touchscreen lock control via a pulse button installed near the Cerbo GX.
• Rack temperature monitoring through a dedicated sensor connected to the Cerbo GX.
• Roof-level connection for both solar input and generator interface.
• Clean and secure cabling layout: the rack tower allows neat cable management, separating AC, DC, and signal paths on different sections of the tower.
• Easy transport and maintenance — system can be moved easily by removing the batteries.
• Dust protection: four filtered ventilation grids on side panels ensure proper cooling and air quality inside the rack.

[alexpescaru]

Nice integration !!

It would have look much better with the Multi RS19 Solar.
But we are still waiting for it… Was Q2-2025, now it’s Q1-2026

[B51-technician (SunMachinist)]

Any DC fuse between PylonTech US5000 and the Multi RS?

[PaoloBn]

totally agree with you about RS19, may be in a next project

[PaoloBn]

I know that is a good practice to put a fuse between battery pack and inverter, in this project at the moment no fuse are present.

Personal risk analysis

Regarding the Pylontech US5000, there are internal protections, including short-circuit protection (certified according to IEC 62619).
This is beneficial for parallel stacking, since all batteries are connected in parallel.
In many installations I have seen, the interconnections between batteries are not fused — internal faults are expected to be managed by the battery’s own protection system (BMS).

The main point of concern, therefore, is the connection between the battery pack and the inverter.
What is the probability of a short circuit occurring at the DC terminals of the inverter? Possible causes include inverter internal faults, accidental short circuits, others…

A fuse would reduce the risk by interrupting the energy flow, but it is not always clear whether it can effectively protect the internal electronics of the battery or the inverter.
The fuse must be fast enough to operate before damage occurs.
From my past experience on another project involving supercapacitor storage, a short-circuit fault did not save the supercapacitors — standard fuses were not fast enough to prevent damage.

If you have any suggestions regarding fast-acting fuses, please let me know.
In previous research, I found that Mersen offers high-speed semiconductor protection fuses, which may be suitable for this kind of DC application.
Just for curiosity this is the supercap 5.5 KHwh modules

here fuse are mandatory for absence of internal protections (electronic fault but fuse stop energy flow)

[alexpescaru]

You’re right, the fuse is not by far quick enough to disconnect the circuit.
The FETs from the H-bridge inside inverter or the PCB traces will blow way sooner than the breaker will disconnect the circuit.
The fuse in these cases will be more like an isolation switch than a protection device.

[maa (Pattaclop Pénélope)]

Good job, Nice integration !!

[PaoloBn]

Thanks for the appreciation!

[Frisianstar]

Neat and tidy, I like that.

Has the pylon a fuse or a breaker?

My system with the rs also will have only a fuse on the battery

[PaoloBn]

Thanks a lot!
At the monent no fuse is present, look at some consideration on previous messages.
as in your system, I’m going to select a fast fuse for battery to rs connection, first selection is Mersen A70QS100-4 (100 A High Speed)