5 Costly Mistakes When Buying PV Grounding Clip

Most of the money lost on pv grounding clips orders is not lost on price. It is lost on five repeatable mistakes that are all avoidable at the specification stage — before anything is made, shipped or claimed.

Mistake 1: High bonding resistance

a tooth that is too shallow to pierce the anodised layer, giving a path that reads fine on a multimeter and fails under fault current

How to avoid it: Put it in the specification, not in an email afterwards: the grade, the tolerance and the test that would have caught it.

Mistake 2: Tooth flattened on installation

hardening skipped, so the tooth deforms instead of penetrating

How to avoid it: Ask for the per-batch test record that proves the property in question — bonding resistance test; penetration depth check — before the goods ship, not after they arrive.

Mistake 3: Treating every pv grounding clip quotation as the same product

Suppliers legitimately differ on material and hardening process; whether the resistance is certified; coating and plating. A quotation lower than the others usually means one of those levers was moved, not that the margin was thinner.

How to avoid it: Force every quotation onto the same one-page spec — AISI 304 stainless; AISI 316 for coastal as the material basis — so the price spread means something.

Mistake 4: Ignoring packing and freight until the invoice

500 pcs per bag, 5,000 pcs per carton. Packing is not an afterthought on this product: under-packed goods arrive as claims, and last-minute packing upgrades at the port cost several times the factory rate.

How to avoid it: State the packing and labelling in the RFQ and make it a priced line on the quotation, so the comparison is honest.

Mistake 5: Treating every pv grounding clip quotation as the same product

Suppliers legitimately differ on material and hardening process; whether the resistance is certified; coating and plating. A quotation lower than the others usually means one of those levers was moved, not that the margin was thinner.

How to avoid it: Force every quotation onto the same one-page spec — AISI 304 stainless; AISI 316 for coastal as the material basis — so the price spread means something.

The one-page check before you place the order

1. Grade and standard fixed on paper: AISI 304 stainless; AISI 316 for coastal, to IEC 62548.
2. Size range confirmed: M8 bolt fixing, tooth height 0.8–1.5 mm, compatible with standard mid and end clamp footprints.
3. Finish and coating stated: passivated stainless or plated copper alloy; the penetrating tooth must stay bare to bite through anodising.
4. Test evidence agreed: bonding resistance test; penetration depth check; salt spray 1000 h.
5. Packing priced as a line item: 500 pcs per bag, 5,000 pcs per carton.
6. Minimum order and lead time understood: 5,000 pcs, 18–28 days.

Six lines, one page, zero of them optional. The suppliers who push back on any line are telling you where your order will go wrong — which is exactly the information you wanted for free.

Related: the supplier selection guide turns this checklist into ten interview questions, and the price guide explains which cost differences are real.