The safety checklist
| Component | Why it matters |
|---|---|
| Structure and module-frame earthing | Keeps exposed metal at earth potential if insulation fails |
| Inverter / AC earthing | Protects the house wiring and equipment |
| Lightning arrester with its own earth | Gives lightning a controlled path to ground |
| DC distribution box (DCDB) | Fuses, surge protection and an isolator on the DC side |
| AC distribution box (ACDB) | MCB/RCCB, surge protection and an isolator on the AC side |
| Solar DC cable | UV- and heat-resistant, correctly sized to limit losses |
| MC4 connectors | Weatherproof, polarity-safe joints; must be properly crimped |
| Conduit and trays | Protect cables from UV, rodents and abrasion |
Why DC is different
DC arcs don't self-extinguish the way AC arcs do, and panels produce voltage whenever there's light — you can't "switch off the sun". That's why DC isolators, correct fuses and good connectors matter more than on normal house wiring.
Lightning and pre-monsoon storms
Indore sees intense thunderstorms before and during the monsoon. A roof-mounted lightning arrester with a dedicated earth, plus surge protection devices on both DC and AC sides, protects the inverter — the component most vulnerable to surges.
What to ask any installer
- How many earth pits or what earthing design, and for what?
- Which DCDB/ACDB components and SPD ratings?
- Which cable brand and size?
- Are connectors crimped with the proper tool?
- Will you give me a single-line diagram of my system?
We document all of this in your handover file. See also the inverter guide.