When we first got the camper I was confused by the low charge rate of the solar charger. In bulk it would charge just fine, but when in float — it would let the battery discharge to ~13V before re-entering bulk charging. That is far too low for a camper solar setup.
I found an online discussion regarding the EPEVER Tracer that explained the behavior. The settings are not well optimized for a solar system on a camper, where you want to utilize the sun as much as possible.
Using the Solar Guardian app and the EPEVER BLE RJ45 D adapter (factory installed on my Hero Camper), I connected to the EPEVER Tracer-AN G3 solar charger via Bluetooth. I added the device under Local Connection and set Communication ID Number to 1.
Two settings were set too low: Float Charging Voltage and Bulk Voltage Recovery Voltage. By increasing these I prevent the battery from draining down to 13V before re-entering bulk, and increase the charge during float.
Useful video regarding float charging LiFePO4 batteries: Lithium Cells in Float Charge. Will it destroy your battery? by Off-Grid Garage
| Parameter | Current | New |
|---|---|---|
| Rated Voltage | 12V | 12V |
| Battery Type | LFP4S | User ✅ |
| Overvoltage Disconnect Voltage | 14.50V | 14.50V |
| Charging Limit Voltage | 14.30V | 14.30V |
| Overvoltage Recovery Voltage | 14.30V | 14.30V |
| Equalize Charging Voltage | 14.20V | 14.20V |
| Bulk Charging Voltage | 14.20V | 14.20V |
| Float Charging Voltage | 13.30V | 13.50V ✅ |
| Bulk Voltage Recovery Voltage 1 | 13.00V | 13.30V ✅ |
| Low Voltage Recovery Voltage | 12.80V | 12.80V |
| Undervoltage Alarm Recovery Voltage | 12.20V | 12.20V |
| Undervoltage Alarm Voltage | 12.00V | 12.00V |
| Low Voltage Disconnect Voltage | 11.30V | 11.30V |
| Discharging Voltage Limit Voltage | 11.00V | 11.00V |
| Li-ion Battery Protect | Enable | Enable |
| Temperature Compensation | 0 mV/°C/2V | 0 mV/°C/2V |
| Boost Charging Time | 10 min | 30 min ✅ |
| Equalize Charging Time 2 | 10 min | 0 min ✅ |
Charging time parameters are located on the Battery Parameters Settings page, the rest on Battery Control Parameter.
When changing battery type from LFP4S to User, all settings must be set manually.
These settings have been running smoothly since April 2026 😎
User manuals:
- Tracer-AN-G3-Manual-EN-V2.2.pdf (2.3 MB)
- EPEVER-BLE-RJ45-D-Manual-EN-V1.2.pdf (306.8 KB)
