Frequently Asked Question

Almost done with my DIY system... now what?
Last Updated 3 years ago

Troubleshooting/System Start-Up Checklist

Before beginning, ensure all lugged connections are tight. If you have a master on/off switch, turn it to 'on' and move forward.


  • We generally do the positive connections first, so that when they connect the negatives, it is less likely to pop a fuse
  • Ensure the power cable or temperature sensor for the BMV is located at a battery’s positive post, rather than at a positive busbar or positive terminal post.
  • Ensure you have a single cable from your battery bay running to the battery side of the shunt. The shunt is meant to be wired in one direction, so ensure it states “battery” on the side of the shunt connected to the battery bank.
  • Scroll up or down on the battery monitor display until you see the battery voltage. It should read between 12 and 14 volts, depending on your state of charge.
  • Press up to view your system’s amperage, which should be no more than a couple of amps until we proceed to the point of powering on equipment.


  • Turn the inverter on/off switch to “on”.
  • Turn the inverter remote to “on” for the Digital Multicontrol, or enable it from the Color Control if applicable.
  • You should see a green light on the faceplate of a Victron Inverter. A Magnum inverter will have a green light on the bottom of the unit.
  • NOTE: If you see a red light, check the connections and voltage of your battery bay
  • Turn the dial down to 8 on your Digital Multi Control, limiting the current to 8 amps and not throwing your home breaker.
  • Plug into shore.
  • For a Victron inverter, it should now have a yellow light showing it’s charging your battery.
  • This can be confirmed by looking at your BMV-712. Press the up or down arrow until you see the amperage screen. It should now read a positive number as the batteries are charged from shore power.
  • Find an appliance like a hairdryer or microwave that consumes 1200 watts or more, and plug it into a socket that is connected to the inverter.
  • Turn it on for 15 seconds to ensure your system is power assisting by inverting and passing through shore power at the same time.
  • Turn your inverter off for now by using the Digital Multicontrol remote (or Color control if applicable).


  • Ensure you connect your solar system in the following sequence:
  • Engage the circuit breaker between your solar MPPT charge controller and your batteries.
  • Turn the solar “on/off” switch to on.
  • You should see a solid blue light on the MPPT controller. This means it is bulk charging.
  • Open up the VictronConnect app on your phone.
  • Confirm you see between 16 and 21 volts from the solar input.
  • During the day when your vehicle is outside in the sun, confirm you see amperage from solar input.
  • Note that the voltage from solar will be constantly changing as the MPPT adjusts to maximize current. This is normal.
  • Turn the solar on/off switch off for now as we proceed.

DC Power:

  • Engage the DC circuit breaker.
  • Any DC powered device should now be powered, assuming the fuse is intact.
  • Note you’ll see a flashing blue light on the BP Battery Protect, showing it’s operating normally.
  • Disengage the DC circuit breaker back to move to the last step.


  • NOTE: To perform this test, wait until you are familiar with your system and the battery monitor has been running for a few days. You’ll need to make sure the battery SOC (State of Charge) is less than 80%.
  • Engage the DC circuit breaker.
  • Open up the Battery Monitor (BMV-712) app in VictronConnect so you can view the amperage screen.
  • State the vehicle, and you’ll see a positive reading from the battery monitor, reflecting it charging from the alternator.
  • Note that if your battery is close to full, the Cyrix will disengage to prevent overcharging.
  • Now turn re-engage all the circuit breakers, then turn on the on/off switches. Turn the inverter’s power back to “on” from the remote control, and dial the current limit back up to 13 or 14 amps to ensure you don’t pop your home breaker.
  • Now go out and enjoy your system!

Common mistakes:

  • When connecting to VictronConnect, only one device can be connected to one phone at a time. If you are having problems connecting, reboot your phone and anyone else’s phone that might have connected.
  • Ensure you have a chassis connection from your shunt to the frame of your vehicle that is proper: It should be bare metal-to-metal, heavy gauge wiring that is used to connect the batteries, and ideally no more than 3-6 feet in length.
  • Ensure all your grounds go connect to the load side of the shunt. There is only one connection on the battery side, that will be the single cable from your battery bank. If it’s not wired in this manner, the shunt won’t get accurate readings. Ensure all your grounds go connect to the load side of the shunt. There is only one connection on the battery side, that will be the single cable from your battery bank. If it’s not wired in this manner, the shunt won’t get accurate readings.
  • If a connection point is getting hot, it is too loose! You’ll want to hand tighten every connection point to the point the lug can’t twist or move if you try to bend the cable in any direction.

Please Wait!

Please wait... it will take a second!