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Rich Solar Extension Cable to Connect Charge Controller to Battery | Pair of Red and Black Extension Wires to Connect Charge Controller to Battery Cable | Choose Gauge: 8AWG, 10AWG - 8 AWG
Frequently Bought Together
Extension Cable to Connect Charge Controller to Battery — Red & Black Pair
This set of red and black extension wires connects your charge controller directly to your battery bank, with ring terminals pre-installed on the battery end and bare, exposed wire on the controller end for a direct connection into your charge controller's terminal block. Available in 8AWG or 10AWG, each set runs 10 feet and is rated for outdoor and mobile installation conditions — a simple, purpose-built solution for one of the most common wiring runs in any off-grid solar system.
A practical fit for most single-panel and small array charge controller connections — typically suited to controllers in the 20–30A range over a 10-foot run. Confirm your controller's maximum continuous current and consult a wire gauge ampacity chart before final selection.
A heavier-gauge option for higher-current charge controller setups or installations where minimizing voltage drop over the 10-foot run matters most — generally appropriate for larger multi-panel arrays feeding a higher-output controller.
Ring Terminals on the Battery End
Pre-installed ring terminals on the battery end bolt directly onto standard battery posts or terminal lugs — no crimping tools, no separate terminal purchase, no guesswork on terminal sizing.
Exposed Wire for Direct Controller Connection
The controller end ships with bare, exposed wire so it inserts directly into your charge controller's terminal block or screw connector — the standard termination style most charge controllers expect.
Color-Coded Pair, Outdoor Rated
The matched red (positive) and black (negative) pair keeps polarity clear at a glance during installation, and the cable's rated voltage and wide temperature range support both indoor and exposed outdoor wiring runs.
Product Overview
This extension cable set is built to handle one specific, essential connection in an off-grid solar system: the wiring run between your charge controller's battery terminals and your battery bank itself. Rather than a generic length of bulk wire that needs separate terminals purchased and crimped on, this set comes pre-terminated and ready to install — ring terminals on the battery end, bare wire on the controller end.
The ring terminal end is designed for a direct, secure bolt-on connection to standard battery posts, terminal lugs, or a busbar — eliminating the need for a separate crimping tool or aftermarket terminal purchase. The opposite end is left as bare, exposed wire, matching the screw-terminal or terminal-block style connection used by the vast majority of solar charge controllers on the market. This combination means the cable arrives ready to connect on both ends without additional hardware, assuming your charge controller uses a standard terminal block input.
Each set is sold as a matched 10-foot red and black pair, available in 8AWG or 10AWG depending on your system's current draw and how much voltage drop you can tolerate over the run. The cable is rated for 600V/1000V and rated for use from -40°F to +185°F, making it suitable for both interior wiring runs and cable paths that pass through less climate-controlled spaces like an RV underbelly, basement bay, or exterior conduit run.
Skip the Crimping, Skip the Guesswork
- Pre-Installed Ring Terminals: The battery end arrives ready to bolt onto a standard battery post, terminal lug, or busbar — no crimping tool, no separately purchased lugs, no risk of an undersized or poorly crimped connection.
- Standard Terminal Block Compatibility: The bare wire on the controller end matches the screw-terminal connection style used by the overwhelming majority of solar charge controllers, from basic PWM units to higher-end MPPT models.
- Faster Installation: With both ends pre-prepared for their respective connection points, most installations are a matter of stripping a small amount of insulation if needed, inserting the wire into the controller terminal, and bolting the ring terminal to the battery — typically a 10-15 minute task.
- Reduces Connection Failure Points: A poorly crimped aftermarket ring terminal is a common source of resistance, heat buildup, and intermittent connections in DIY solar wiring — a properly terminated cable removes that risk from this specific connection.
Choosing the Right Gauge for Your System
- Wire Gauge Affects Voltage Drop: Over a 10-foot run, thinner wire (higher AWG number) carries more resistance, which translates to greater voltage drop and lost charging efficiency — particularly noticeable at higher current draws.
- 10AWG for Standard Setups: A common fit for smaller controller-to-battery connections where current draw stays within a moderate range — appropriate for many single and dual-panel setups.
- 8AWG for Higher-Current Systems: The heavier gauge handles more current with less voltage drop — worth selecting when your charge controller's rated output current is on the higher end, or when minimizing line loss matters for charging efficiency.
- Match to Your Charge Controller's Rating: The correct gauge depends on your specific charge controller's maximum continuous output current — check your controller's datasheet and a wire ampacity chart before finalizing your gauge selection.
Built for Real Installation Conditions
- 600V / 1000V Rated: Insulation rated well beyond typical 12V and 24V off-grid system voltages, providing a wide safety margin for the actual voltages this cable will carry in service.
- -40°F to +185°F Operating Range: Suitable for wiring runs that pass through unconditioned spaces — RV underbellies, basement battery compartments, exterior conduit runs, and other environments subject to temperature extremes.
- Color-Coded Red & Black Pair: Keeps polarity unambiguous throughout installation and during any future troubleshooting or system modification — red consistently positive, black consistently negative.
- Matched Pair, Same Length: Both wires in the set are cut to the same 10-foot length, simplifying routing and ensuring a clean, consistent cable run between your controller and battery bank.
Full Specifications
| SKU | RS-1010 |
| Length | 10 ft (Red & Black Pair) |
| Wire Gauge | 8 AWG or 10 AWG |
| Rated Voltage | 600V / 1000V |
| Temperature Range | -40°F to +185°F |
| Battery End Termination | Ring Terminal |
| Controller End Termination | Bare/Exposed Wire |
Best Uses
- Connecting a PWM or MPPT charge controller to a 12V or 24V battery bank
- RV, van, and cabin off-grid solar system wiring
- Replacing damaged or undersized factory charge controller cabling
- New off-grid solar system builds requiring a controller-to-battery run
- Marine solar installations with controller and battery in separate locations
Key Benefits
- Pre-installed ring terminals — no crimping tools required
- Bare wire end matches standard charge controller terminal blocks
- Available in 8AWG or 10AWG to match your system's current draw
- Matched 10-foot red and black pair for clean, polarity-clear wiring
- 600V/1000V rated with a wide -40°F to +185°F temperature range
| Specifications | |
| Model SKU | RS-810 |
|---|---|
| Length | 10 feet |
| AWG | 8/10 |
| Rated Voltage | 600/1000V |
| Temperature | -40°F to +185°F |
