---
title: "Products — ソーラーパネル 400w - Flapen"
canonical_url: "https://flapen.com/research/jp/diy/400w/products"
last_updated: "2026-08-08T08:45:22.041Z"
locale: en
meta:
  description: "Niche score 58/100 · ¥17.5M/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
  "og:description": "Niche score 58/100 · ¥17.5M/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
  "og:title": "Products — ソーラーパネル 400w - Flapen"
---

# **ソーラーパネル 400w**

**Worth a look**

Shows a $17.5M/yr market, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size 100Growth 22Conversion 6Competition 74Returns 90Price range 0Avg price 0Brand share 53Review moat 98Quality gap 85

**Market size**

**Incredible****¥17.5M**

¥17.5M/yr · 109K searches

**Review moat**

**Incredible****47.64**

avg incumbent reviews — the moat a new listing must climb

**Returns**

**Great****1.3%**

return rate — above 5% kills the launch gate

**Quality gap**

**Great****4.2★**

avg incumbent rating — lower means beatable quality

**Competition**

**Good****41%**

top-5 click share — leaders hold, buyers still browse

**Brand share**

**Good****73%**

top-5 brand share — brands hold most of the demand

**Growth**

**Bad****-5.8%**

90-day search growth — must beat 0% to launch

**Conversion**

**Bad****0.5%**

search→purchase rate — share of searches ending in a sale

**Avg price**

**Bad****¥34150.68**

avg listing price — sweet spot $15–$100

**Price range**

**Bad****¥7719.36–¥75614.21**

cheapest to priciest tracked listing — scored on the share inside $15–$100

**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=jp&signal=low_review_barrier "Top brand's reviews < 500") [** High Price**](https://flapen.com/research/niches?market=jp&signal=high_price "Avg price > $50")

## Products