Solar Charge Controller Voltage Set-Point Adjustment for Alternator Load Reduction
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Solution Overview
Problem
In vehicle electrical systems, solar charge controllers typically switch to float mode when the alternator is running, ceasing to contribute power and increasing the mechanical load on the engine, which reduces fuel efficiency due to unnecessary alternator power generation.
Innovation Solution
A solar charge controller that monitors the vehicle's battery voltage and sets its set-point 0.1 Volts higher than the alternator's regulation voltage when the alternator is operating, allowing the solar panels to continue contributing power and reducing the load on the alternator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the solar charge controller operates in float mode when the alternator is running, then the battery is protected from overcharging, but the solar system stops contributing power and the alternator bears the full electrical load
Solution Approach 1:
The solar charge controller dynamically adjusts its voltage set-point based on the operating state of the alternator. When the alternator is running, the controller raises its voltage set-point above the alternator's regulation voltage, allowing solar power to supplement the electrical system and reduce alternator load, thereby reducing fuel consumption. When the alternator is not running, the controller returns to float mode to protect the battery from overcharging.
Solution Approach 2:
The invention changes the voltage parameter of the solar charge controller based on system conditions. By adjusting the voltage set-point from the standard float mode voltage to a higher value when the alternator is operating, the system enables solar panels to contribute power during alternator operation, optimizing the balance between battery protection and fuel efficiency.
2Ease of operation
If the solar charge controller uses a fixed voltage set-point for battery charging, then the charging process is simple to control, but the system cannot adapt to alternator operation and loses solar power contribution
Solution Approach 1:
The solar charge controller transitions from a static voltage set-point to a dynamic one that responds to alternator operation status. The controller monitors system voltage and alternator state, automatically adjusting its voltage set-point to be higher than the alternator's regulation voltage when the alternator is running, enabling seamless adaptation to different operating conditions while maintaining simple control logic.
3Device complexity
If the alternator generates all electrical power, then the electrical system is simple to manage, but the mechanical load on the engine increases and fuel efficiency decreases
Solution Approach 1:
The invention merges the power contribution of the solar system with the alternator's power generation. By coordinating the solar charge controller's voltage set-point with the alternator's operation, the system combines two power sources to share the electrical load, reducing the alternator's mechanical load on the engine and minimizing fuel waste while maintaining simple system management.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces the electrical demand on the alternator, improving fuel economy by capturing more energy from solar panels and reducing fuel costs.
Implementation Method 1
solar panels contributing power to the DC system
Data Source
AI summary
In one method of using solar power as a supplemental power source in a DC system of a vehicle, the voltage of a vehicle battery is measured to determine if an alternator is operating. Upon determining that the alternator is running, a solar charge controller sets the voltage set-point to be about 0.1 Volts higher than the voltage produced by the alternator. This allows the solar panel to contribute up to the full power capability of the solar panel to the DC power system, even though the battery may be fully charged, which reduces the load on the alternator, thereby improving fuel economy.