I want to monitor my boats battery voltage when I am away. The boat is connected to the marina wifi but is NOT plugged into shore power. I have a MPPT controller that connects to my phone via BT while I am on the boat. I have read multiple ways of doing this, with a Pi, Home Assistant, ESPY32, Venus…

I have an RPi connected to a MPPT controller and a smart shunt it does need internet access which is provided by a TP link M7350 and a cheap SIM £1.50 for 3gb a month. The whole lots consumes 6watts so not much battery drain. I can switch it all off using a Sonoff remote switch consumption is then…

Then the GlobalLink 520 might be just the thing for you… https://www.victronenergy.com/upload/documents/GlobalLink_520/19329-GlobalLink_520-pdf-en.pdf

Thanks for the quick reply. A few detailed questions: Are you using VenusOS on the Pi? Do I need a cable to connect the MPPT to the Pi, or can it connect wirelessly (I have a Pi 4 with BT) I haven’t used VenusOS, once I am away how do I see what the Pi is getting? I know there is a Victron remote …

Take a Raspberry Pi Zero 2 W with Venus OS , register a VRM Account, 12V /USB DC/DC converter for power supply, connect the mppt with a VE.direct cable. Online connection with build in wlan to marina and/ or cheap LTE modem with sim card. Alarm rule at VRM to get a email if battery has become un…

Yes I’m running Venus OS on an RPi 3B+. Only got 105Ah LFP batter here and so far it’s not been a problem. I turn the Pi off in the winter to save battery only turning it on when I need to check the system. Cable connections from the Victron kit to the usb on the RPi, I started with cheap copy cabl…

So I can’t use BT over wifi to the Pi? I need a victron VE to USB cable (not the VE to VE cable)? My mppt has BT wireless, which is how I connect to my phone.

You can use BT only for VE.Smart Network or your smartphone GX devices for remote management are working only with a cable (VE.direkt for your mppt, Ve.bus, Ve.can, ..) GX and VE.Smart Network are two complete different worlds. For a raspi you need this VE.Direct zu USB-Interface | Vic…

I used to run a system before I went RPi Venus OS that used BT It was an old 4G Android Tablet that connected as normal to the Victron kit over BT. However it also had TeamViewer installed and my machine at home had the same. It meant I could remote access the Tablet from home. Took me a while to …

[grafik] My quick solution for remote management. If you have a Orion XS instead of a mppt you can monitor start and house battery.

Thanks. So you have a 2w with the USB Victron cable going to mppt, what is the white device to the right of the rasp, and I guess from the 12V you goto a switch that then feeds a LCD screen? (can’t see it well). The ‘braided’ black white coming from the pi is video for lcd?

Simplest way to remote monitor battery voltage from afar

DIY

DirkW 29 September 2025 14:04 12

At the top of the picture you see the dc/dc converter 12V → Usb, the white at the right side is a LTE modem.
Uder the Raspi is a USB hub

There is no display cable….GX Wifi Display is greater

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Simplest way to remote monitor battery voltage from afar

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