I am in need of some guidance regarding the steps necessary to properly pre-charge a Multiplus 3000 attached to a 24 volt battery. I have found very little credible information available regarding this topic. After having built a Victron system, I am now finding that even with the use of two different resistors, attempting to connect the battery cable results is a substantial spark. The following summarizes the steps I have taken this morning:
Connect the hot 2/0 cable to the battery.
- Turn on the Blue Sea Systems M Series Battery switch, leaving on during the following two steps.
- Attach a 50 watt\25 ohm metal cased resistor to the black 2/0 battery cable, then touching the negative battery post to the resistor contact for 10-15 seconds (clicks are heard from the Multiplus, lights on the Victron shunt, distributor, Cerbo GX, and Victron Smart Solar 150\45 MPPT etc light up).
- Disconnect the resistor from the battery post and remove, attempt to connect the black 2/0 battery cable to the negative post.
After experiencing a substantial spark, I attempted to complete the above process using a metal 100 watt\2 ohm resistor instead, having the same results.
Can someone provide me with guidance? Am I not following the correct steps to properly pre-charge the Multiplus?