SmartSolar MPPT RS 450|100 External Earth Fault Alarm

Node-RED
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1

I am trying to achieve an external Buzzer/Light for an installed system with a SmartSolar MPPT RS 450|100. In the spec sheet I can see there is a programmable relay, can this be assigned to toggle on Earth Fault to then toggle a contactor coil for an external earth fault buzzer circuit? If not is there another way that this could be achieved.

TLDR: External Earth Fault Buzzer on SmartSolar MPPT RS 450|100 how to achieve this.

2

If you don’t have a 450/100 available, check out the VictronConnect demo to see the relay-on-alarm feature. You can also use Node-RED to monitor for error #41 (panel isolation resistance too low) and automatically trigger alerts or activate a Cerbo GX relay when ground faults occur.

3

Thanks Owen, I have a 450/100 available. Was just wanting to program the relay to toggle on panel isolation fault, so I can run an external buzzer to the building. So as to make people entering aware that the metallic structure could potentially be “live”. I understand the 450/100 is Galvanically Isolated so this issue should never arise but, it’s a safety at request of the end customer.

I Will have a look into the Node-RED suggestion you have said.

Thanks!

5

Hello,

I need to do the same thing. My two Cerbo relays are already being used by other functions. The MPPT RS 450/200 relay is available.

@AzzaD Did you find a solution? If so, could you tell me what it is please ?

There’s no “relay mode” for a ground fault of MPPT RS 450 in Victron Connect.

I’m not a software developer, but if I don’t find another solution, I’ll try programming with Node-RED. :frowning:

Could someone explain to me, in general terms, what needs to be done with Node-RED to achieve the following please ? :

  • In case of a ground fault (pv1, 2, 3, and 4): MPPT RS 450/200 relay: OFF

  • Conversely

6

I tried in VRM, my installation, settings, setting alarms, MPPT450/200, I switch ON these :

#41 - Inverter shutdown (panel isolation resistance too low)

#42 - Inverter shutdown (ground current too high: >30mA)

#43 - Inverter shutdown (voltage over ground relay too high)

I try to wire the ground on negative or positive (during 1hour) but a didn’t receive any alarm.

7

Hi all,

I created a simple program in Node-RED.

It works.

IMG_1175
IMG_11752868×1320 172 KB

But with relay 2 of the Cerbo (Venus device).

Her is my setting :

  • A Stored: MPPT 450/200 MT (3) > /Pv/IsolationResistance :

Custom input => MPPT 450/200 MT

Measurement => /Pv/IsolationResistance

Name => pmasse

Preview => (100000000 < 700000)= X FALSE

Condition 1 :

Operator => < (less than)

Threshold => 700000

Output when TRUE => 0

Output when FALSE => 1

Debounce (ms) => 2000

  • relay control :

Relay => Venus device

Measurement => Venus relay 2 state

Value types

  1. Open

  2. Closed

Initial value => Don’t set initial value

Name => stop relay

Attached, a picture of my NodeRed.

One problem : I can’t control the RS450 relay by the same way :

  • relay control :

Relay => MPPT 450/200 MT

Measurement => Relay on the charger

Does anyone know why?