Why voltage drop matters
Undersized cables cause sag that trips inverters and reduces performance. Aim for ≤3% drop on critical DC runs.
Wire sizing
We recommend a conservative AWG from ampacity tables, then calculate drop for that gauge. Use DC Cable Size for manual gauge picks.
Frequently asked questions
Q: One-way or round-trip? A: Enter one-way length; math uses round-trip resistance. Q: Copper only? A: Yes—aluminum needs larger gauge.