Sapphire Energy
#4 AWG Battery Cable Set
#4 AWG Battery Cable Set
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Heavy-duty 4 AWG battery cable set designed for moderate to high-current lithium battery systems, DC distribution, and inverter installations. Each set includes one red and one black cable, professionally terminated with tinned copper lugs and sealed with heatshrink over the crimps for long-term durability.
Constructed from fine-strand copper wire with a 105°C PVC jacket, these cables offer excellent flexibility and reliable performance in demanding solar, marine, RV, and off-grid environments.
No problem. Contact us and we can build it for you. Please include the desired length, AWG size, and lug size in your request.
- High flexibility — fine-strand copper construction for easier routing
- Heat-rated insulation — 105°C PVC jacket
- Tinned copper lugs — corrosion-resistant and ideal for battery environments
- Crimped & sealed — heatshrink applied over terminations
- Sold as a red/black pair — clean positive and negative wiring
| One-Way Cable Length | Suggested Max Current |
|---|---|
| Under 1 ft | Up to 125A |
| 1 – 3 ft | Up to 110A |
| 3 – 7 ft | Up to 90A |
Regularly inspect all battery cable connections for tightness and signs of heat or discoloration. Loose connections are a leading cause of overheating and system failure.
If a cable is expected to carry full rated current for extended periods, consider upsizing the wire to reduce voltage drop as well as reduce heating concerns.
Ampacity depends on total circuit length (positive + negative), ambient temperature, installation method, and acceptable voltage drop.
| Wire Gauge | 4 AWG |
|---|---|
| Conductor | Fine-strand copper |
| Insulation | 105°C PVC |
| Lug Material | Tinned copper |
| Stud / Lug Options | M8 (5/16") or M10 (3/8") |
| Length Options | Assorted lengths (selected by buyer) |
| Color | Red & Black (pair) |
Cable lengths are nominal and may vary slightly due to manufacturing tolerances.
- 1 × Red 4 AWG Battery Cable (length selected by buyer)
- 1 × Black 4 AWG Battery Cable (length selected by buyer)
Can you make custom cable lengths?
Yes. If you need a specific length or lug combination not listed, contact us and we can build it for you. Please include the desired length, AWG size, and lug sizes in your request.
What is included in this listing?
Each purchase includes one red cable and one black cable of the selected length and lug size.
Are the lugs crimped or soldered?
The tinned copper lugs are professionally crimped and sealed with heatshrink for mechanical strength and corrosion resistance.
Do I need a fuse with these battery cables?
Yes. Battery cables should always be protected by a properly sized fuse located as close to the battery as possible. This protects the wiring and equipment in the event of a short circuit.
Find your fuses here.
What type of fuse should I use?
For lithium battery systems and inverters, Class T fuses are commonly recommended for higher current applications. Smaller systems may use MEGA or ANL fuses depending on system size.
How do I size the fuse for 4 AWG cable?
Fuse size should be selected based on the cable’s safe current capacity and the requirements of the connected equipment. The fuse protects the cable, not the device. If you're unsure which rating is appropriate, contact us and we’ll help you choose.
Does this work with lithium battery systems?
Yes. 4 AWG cable is commonly used for lithium battery banks, DC distribution, and moderate inverter connections within appropriate current limits.
How do I choose the correct cable size?
Cable size depends on current draw, total circuit length, and acceptable voltage drop. If you're unsure, contact us and we’ll help you select the appropriate size.
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