Setting a charge limit protects battery health and manages power draw. There are two limits: **battery percentage** (set on your car) and **amperage** (set on your charger). Here's how to configure both.
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## Battery Percentage Limit (Set on Your Vehicle)
Your EV's Battery Management System (BMS) controls when charging stops. The charger simply follows the car's command.
**How to set it:**
- **Touchscreen:** Go to *Settings* → *Charging* → *Target Charge Level*, then adjust the slider (50–100%).
- **Mobile App:** Open your car's app → *Energy/Charging* → set *Max Charge Level*.
**Best practice:** NMC batteries → 80–90% daily; LFP batteries → 100% per manufacturer guidance. Raise to 100% before long trips.
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## Amperage Limit (Set on Your Charger)
Amperage controls charging speed. Set it to 80% of your breaker rating for safe continuous operation.
| Breaker | Charger Setting |
|---------|----------------|
| 20A | 16A |
| 30A | 24A |
| 40A | 32A |
| 50A | 40A |
| 60A | 48A |
**On Carbetta chargers:**
- **Display models:** Access *Settings* → *Charging Current* → select amperage → confirm.
- **WiFi models:** Open Carbetta app → select charger → *Settings* → *Max Current* → save.
- **Portable models:** Use the physical selector switch on the unit.
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## Quick Troubleshooting
- **Car ignores percentage limit?** Re-save the setting and lock/unlock the car to reset the BMS.
- **Charger won't adjust amperage?** Power-cycle the breaker for 2 minutes, then retry.
- **Stops early?** Reduce amperage—the gun or unit may be overheating.
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## FAQ
**Can I set both limits?** Yes. They work independently.
**Why doesn't my charger have a percentage setting?** No charger controls battery percentage—that's always handled by the vehicle.
**Should I lower amps in hot weather?** If the gun gets too hot to hold, drop amperage by 25–30% to reduce heat.
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## Key Takeaway
Set battery percentage on your **car** (80–90% for daily use). Set amperage on your **charger** (80% of breaker rating). Done right, you'll extend battery life and avoid tripped breakers.
