Victron Energy Solar Charge Controller: “Err 43”
danger RV solar charge controller error codes
What it means
On the SmartSolar MPPT RS / inverting models, Err 43 is an inverter shutdown caused by a ground fault: the voltage difference between neutral and ground is too high.
Most likely causes
- Missing or incorrect neutral-to-ground bonding in the AC installation common
- Wiring/phase connection error common
Safe checks you can do yourself
- Confirm the AC neutral-ground connection follows your local wiring rules
- Have the ground wire installation and phase connections checked
- Note this code applies to inverting MPPT RS-class units, not the basic SmartSolar charge-only controllers
How to reset / clear Err 43
- Correct the ground/neutral wiring fault, then restart the unit
When to call a technician
Any time the ground/neutral wiring is involved — this is electrician territory.
Applies to
SmartSolar MPPT RS · Inverter RS / MPPT RS Smart
FAQ
What does Victron Energy Solar Charge Controller code "Err 43" mean?
On the SmartSolar MPPT RS / inverting models, Err 43 is an inverter shutdown caused by a ground fault: the voltage difference between neutral and ground is too high.
How do I reset Victron Energy Solar Charge Controller Err 43?
Correct the ground/neutral wiring fault, then restart the unit
What is the most common cause of Err 43 on a Victron Energy Solar Charge Controller?
The most likely cause is missing or incorrect neutral-to-ground bonding in the ac installation.
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Sources
- MPPT Solar Charger Error Codes — Err 43 — Inverter shutdown (Ground Fault) (Victron Energy)
Note: Err 43 on the MPPT error page is the ground-fault inverter shutdown for inverting RS-class units; it does not apply to standard charge-only SmartSolar controllers.
● Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual.