Hi looking for some help understanding why my MPPT is tripping the breaker between it and the battery
System Config:
- Smart Solar MPPT 100/50
-Four 425W solar panels wired in parallel (I confirmed using the Victron Calculator that this PV configuration was compatible with the MPPT100/50)
- Two Victron 12.8/100 smart wired in series for 24V system
- VE.BUS BMS and a VE.Direct non-inverting cable wired from the charge disconnect terminal of the BMS to the VE.Direct port of the MPPT
- Battery connections are short (< 30cm) 6 AWG from MPPT to battery.
- Positive wire from MPPT to the battery is protected by marine switch/breaker rated for 60A and 12-48VDC. https://www.amazon.ca/gp/product/B0948NVY7H/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1
Problem:
On a sunny day, the MPPT reports (via Victron Connect) 50 A output to the battery (its limit), and this trips the breaker after 2-3min.
Reducing the array to three 425 W panels, the MPPT reports 40A out to the battery and the breaker trips after 3-4min.
I replaced the breaker with an 80A (80A is higher than specified in the MPPT manual but I had it available to test). 80A breaker also tripped with 4 panels operating and the MPPT reporting 50A to the battery. With 3 panels in operation and 40A output from the MPPT the 80A breaker did not trip.
I do not have a way to measure the actual current output from the MPPT but the manual and the Victron calculator indicate that the 100/50 will limit current output to 50A.
Does anyone have any idea why the MPPT 100/50 is tripping the 60A breaker?
Thank you
