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I have a Victron 150/70 controller, 4 - 200 watt panels, 2-Battle Born Batteries, Xantrex XC2000 inverter and BMV 712 Battery Monitor. My issue is that when the batteries are being charged from solar it fluctuates between 0 Watts and 400 - 500 in bulk mode. When I place a load on the system I do not get a substantial increase. It continues to fluctuate. Occasionally it gives a fault code #38. The amperage is set to 30A from the 70A max based on a recommendation from Victron. Any ideas?
Hi Ed,
It could be a wiring fault, or a problem with the charge controller. Please follow the directions here including the rewiring.
https://www.victronenergy.com/live/mppt-error-codes#err_38_err_39_-_pv_input_shutdown
I’d also have a look at the Max V for each day in the history in VictronConnect.
See how high the voltages are getting.
The panels are wired in series. Would that possibly cause error code #38 or #2?
Hi Ed,
That Max PV Voltage (~45V) shows panels connected in parallel (not series). If the panels were connected in series, that voltage would multiply (4 x 45V = 180V = destroyed MPPT).
So there should be no problem with damaging the MPPT from the current panel configuration.
That large variation in battery voltage (11v to 16V) indicates a wiring fault such as poor connection please contact a professional to inspect the wiring of the system.
Thank you for all your advice.
