Operating Modes

Bulk Stage

During this stage, the batteries are charged at the bulk voltage setting and maximum current output of the DC source. When the battery voltage reaches the bulk voltage setting, the controller activates the next stage (absorption).

Absorption Stage

During this stage, the voltage of the battery is held at the bulk voltage setting until an internal timer has accumulated one hour. Current gradually declines as the battery capacity is reached.

Float Stage

During this stage, the voltage of the battery is held at the float voltage setting. Full current can be provided to the loads connected to the battery during the float stage from the PV array. When battery voltage drops below the float setting for a cumulative period of one hour, a new bulk cycle will be triggered.

 

 

Bulk Stage

Absorption Stage

Float Stage

Charging

 

 

Bulk Volts Setting

 

Started

 

 

 

 

 

 

 

Absorption Time

Float Volts Setting

DC Voltage

Increasing Voltage

Constant Voltage

Reduced Voltage

0 volts

 

 

 

 

 

 

Max Amps

 

 

DC Current

Constant Current

Reducing Current

Reduced Current

0 amps

 

 

 

 

Time

 

 

 

 

Figure 1-2

3-stage Battery Charging Process

 

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Xantrex Technology C40, C35, C60 owner manual Bulk Stage, Stage Battery Charging Process

C35, C60, C40 specifications

Xantrex Technology is a renowned name in the field of renewable energy solutions, particularly known for its robust line of solar charge controllers. Among its flagship products are the C-Series models: C40, C60, and C35. These charge controllers are specifically designed to optimize the use of solar panels, ensuring efficient energy conversion and battery management for off-grid renewable energy systems.

The C40 model stands out with its impressive 40-amp rating, making it suitable for larger solar installations. It features advanced microprocessor technology, enabling precise control over battery charging and discharging processes. This model supports multiple battery types, including flooded lead-acid, gel, and sealed batteries, allowing users to customize their energy systems according to their specific requirements. One of the key characteristics of the C40 is its easy-to-read LCD display, which provides real-time information on system performance, battery voltage, and charging status.

Moving to the C60, this model offers a higher capacity, rated at 60 amps. The C60 is designed for larger applications, such as RVs, boats, and remote cabins, where higher power requirements are common. It shares many features with the C40 but is equipped with additional capabilities to enhance its versatility. One notable characteristic is the built-in load control, which allows users to manage power distribution to connected devices intelligently. The C60 also incorporates a temperature sensor that adjusts charging parameters according to the battery’s temperature, protecting it from overcharging and extending its lifespan.

The C35, while a bit smaller with a 35-amp rating, is designed to cater to medium-sized applications. It offers similar functionalities as its counterparts, including support for multiple battery types and an intuitive LCD display. The C35 is an ideal solution for homeowners and small businesses looking for reliable performance without the need for extensive power management.

All three models feature a durable design, built to withstand the rigors of outdoor use. With a focus on user-friendly operation, these charge controllers come equipped with straightforward installation processes, making them accessible to both seasoned professionals and newcomers to solar energy. Additionally, their capability to integrate with various solar panel systems makes them a flexible choice for diverse renewable energy applications. With Xantrex’s C-Series charge controllers, users can reap the benefits of solar energy while ensuring their battery systems remain healthy and efficient.