Performing a System Check and Basic Troubleshooting

This is a general document to assist with troubleshooting various Victron Equipment. It is intended to be used in conjunction with specific individual product manuals, and the Victron Service Manuals.

Basic system troubleshooting is safe and easy - even for the novice system-owner.

Not only that - it’s a great way to get to know your system, and to be able to describe problems if you need to get help from a more knowledgeable technician who isn’t on site.

If you don’t have the confidence to undertake these tests yourself, find someone who does. Ideally someone who has a bit of power system experience - or some experience of DIY electronics in a boat or vehicle. They’ll help you to be able to do it yourself.

You’ll need a digital multimeter; a Phillips head screwdriver with an insulated handle; and small slot-head screwdriver. You may also need a spanner or socket set, and a torch.

It is a good idea to wear gloves if you are working on wet-cell batteries - and to wear eye protection. It’s also a good idea to remove metal jewellery.


The most common things that are required to assist with the diagnosis of a system is:

  • Product Serial number
  • Description of the fault from the customer
  • Confirmation of the fault from an onsite technician
  • Photos of the system showing:
    • system as a whole
    • close up of relavent elements and their connections
  • VRM portal ID (if there is one)

Basic Observations

The first thing to do is a basic observation.

With a notebook handy, write the date, and the system location. If you have a camera, take a quick photo as this can be useful later if things change.

Photos should include as much as possible of the system in a single frame ...then a close up of any specific components you might be working on, or have concerns about.

If you are doing a system report to present to another technician, get photos of the major component ID tags, showing serial and model numbers.

Make the wiring between components visible if you can, by carefully removing covers.

Only go as far as you feel safe. Never work on AC voltages unless you are qualified. DC systems of up to 48V are generally safe to work with if you take sensible precautions.

Looking at the system:

  • Are there any lights on?
  • What colour are they; are they blinking or solid?

Note them all down - particularly if you don’t know what they mean!

  • Does anything look damaged, burned, melted, loose or broken?
  • Did you notice any smells - or signs of insects or rodents?

Are there any sounds - buzzing or ticking that you haven’t noticed before ...or silence where there used to be sound?

None of these necessarily indicate a problem, but they should be noted as they’ll help you become more familiar with normal operation.

You should be able to gently tug on all the wires and have them stay securely in place.

Loose wires are a common source of faults. If you feel a wire might be loose, or has some wiggle - or obviously if it comes free entirely - you will need to secure it properly. In this case it’s best to shut the system down. Loose wires can lead to electrical arcing or sparks. And exposed wires may have the potential to give you an electric shock.

The safe way to shutdown a system is to first begin at the termini and work toward the batteries:

  • Turn off all loads at their switches.
  • Turn off the inverter if there is one ...then turn off the solar panel supply.
  • Turn off all the remaining switches, finally, disconnecting the main fuse, or system isolator.

Now you should be able to safely tug on all the system wiring connections to make sure they are firmly in place and making a good connection.

If a wire does come loose, inspect it closely: Does it have damage to the copper strands? If so, use some pliers to remove the damage, peeling back some of the insulation.

Wherever there are plugs and sockets, or lugs and bolts, check their connections. We want to make sure that all connections are good. Also look for any signs of corrosion, usually seen as a white/green/blue powder or crystals.


Before asking a question on an existing installation, make sure that all firmware has been updated to the latest official version.

MPPT, BMV and VE.Direct Inverters

Firmware Updates for Inverter/Chargers

See -> Firmwares for the versions of all our products.

System Design

You should always direct system design questions (for example "which MPPT should I use with panels such and such") to a Victron distributor or installer

Another example: "I want to design system such and such, what should I buy?", also contact a dealer or installer. They are trained and can provide you with information and support.


  • Disconnect any third party or home made adaptors or cables.
  • Disconnect from any Smart Voltage Sense, BMV-712 or other Smart Networking connections
  • Confirm panel side voltage is within acceptable range (>5V above battery voltage >10V below maximum voltage rating of unit). This can be done with a Multimeter on the terminals, or within the VictronConnect app (take a screenshot of the Status screen in the app).
  • Confirm panel is connected with correct polarity with a multimeter polarity reading from the terminals of the MPPT.
  • Confirm the battery was not ever connected in reverse polarity
  • Check the fuse on the smaller units.
  • Sniff the unit for any burnt smells
  • If the MPPT model has a fuse, remove the fuse, visually inspect it, check the connections are clean and then test it for continuity with a Multimeter.
  • If the MPPT model has a remote on/off switch, check that is intact and bridging the contacts.

Multiplus and Inverter Chargers

MK3 or Connection issues


Future Topics

Multimeter testing

Battery cell voltages

Battery interconnection and takeoff corrosion

PV voltage, PV Polarity,

Exporting system info from MPPT via VictronConnect

Last updated: 7/1/2019, 2:25:12 PM