Quick Answer
Upgrading an existing charger for off-grid use is feasible, but requires careful consideration of the charger's specifications, the available solar power, and the necessary modifications.
Assessing Charger Suitability
To upgrade an existing Level 2 charger for off-grid use, first assess whether the charger is suitable. Most Level 2 chargers are designed for grid power and may not be compatible with solar power. Look for chargers with a DC output, as these can be more easily modified for off-grid use. For example, the ClipperCreek LCS-25 has a DC output that can be connected to a solar inverter.
Identifying Solar Power Requirements
Determine the solar power requirements for your charger by calculating the charger’s power consumption and the available solar power. For example, a Level 2 charger typically requires 240 volts and 30 amps of power, which translates to 7.2 kilowatts of power. Ensure that your solar system can provide at least this amount of power. A good rule of thumb is to oversize the solar system by 20-30% to account for losses and inefficiencies.
Modifying the Charger for Off-Grid Use
To modify the charger for off-grid use, you will need to connect the charger to a solar inverter and a battery bank. This can be done using a DC-DC converter or a solar charge controller. For example, you can use the OutBack VFX2812 inverter/charger and the OutBack MATE3s remote monitor to connect the charger to the solar inverter and battery bank. Be sure to follow the manufacturer’s instructions and take necessary safety precautions when working with electrical systems.
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