Testing and final checks

Dead tests

With sources disconnected and fuses removed: compare installation to schematic; check cable support, lug orientation and torque; verify continuity only where expected; confirm no positive-to-negative short.

Polarity

Use a meter at every source and device before connection. Mark solar polarity at the roof and controller. Never trust wire color or a pre-made adapter.

First power

Connect battery per manufacturer sequence, install the smallest/lowest-risk control protection first, verify bus voltage, then add circuits one at a time. Stop on sparks, smell, heat or unexpected current.

Functional tests

Test each charging source independently, inverter no-load and loaded behavior, every branch, GFCI/RCD operation and transfer switching. Confirm programmed battery chemistry and current limits.

Heat and follow-up

Sustain major loads and charging while monitoring connections and equipment temperature. Retorque only if the manufacturer instructs it, after the stated interval and fully de-energized.

Rule of thumb

If you cannot state the expected current, full conductor length, protection rating and manufacturer limit for a circuit, the circuit is not ready to build.

CHAPTER CHECK

• I can explain the purpose of every component covered here. • I can identify the exact manufacturer limit that controls my design. • I have added the decision, rating or measurement to my schematic/worksheet.