Battery Tender 5W-45W Automatic Solar Controller is a smart charge controller that lets you use an existing solar panel as a battery maintainer. It adds automatic charge control so the panel can maintain a battery without overcharge.

Best for

• Best for converting an existing panel: turns a raw solar panel into a regulated maintainer
• Best for small solar setups: supports 5–45W panels panels with up to 3A output
• Best for unattended storage: 3-stage control and automatic on/off based on battery voltage

Key technical details

• SKU: 021-1162
• UPC: 734357116205
• Supported panel size: 5–45W panels
• Max input voltage: 32VDC
• Max output current: 3A
• Charge control: 3-stage solar charge control
• What it does: convert a standard solar panel into a smart battery maintainer

Quick technical Q&A

Will it work with any solar panel?

As long as the panel falls within the supported wattage and input-voltage limits, it can be used. Stay under the controller’s max input voltage.

What batteries can it maintain?

Use the controller’s settings for the battery voltage/system you’re maintaining. Confirm chemistry and voltage before connecting.

Do I still need a fuse?

Yes—use appropriate inline fusing close to the battery to protect wiring and connections.