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61

mc4 コネクタ

Worth a look

Shows a $6.7M/yr market, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size 99Growth 24Conversion 62Competition 51Returns 97Price range 0Avg price 0Brand share 52Review moat 92Quality gap 94

Market size

Incredible¥6.7M

¥6.7M/yr · 42K searches

Returns

Incredible0.6%

return rate — above 5% kills the launch gate

Quality gap

Great4.0★

avg incumbent rating — lower means beatable quality

Review moat

Great161.56

avg incumbent reviews — the moat a new listing must climb

Conversion

Good5.5%

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

Brand share

Good74%

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

Competition

Good55%

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

Growth

Bad-1.6%

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

Avg price

Bad¥2951.44

avg listing price — sweet spot $15–$100

Price range

Bad¥588.50–¥10574.84

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

According to Flapen's Amazon Japan niche tracking, mc4 コネクタ is a ¥6.7M/yr Amazon Japan market (42K searches/yr). The top 5 brands hold 74% of demand. Demand peaks in Aug. Verdict: Worth a look — 61/100.

Data updated Jul 30, 2026 · scored weekly · How we score niches

mc4 コネクタ market data

Units sold / yr
2K–3K
avg 0–100/product
Revenue / yr
¥5.9M–¥7.4M
units × avg price
Conversion rate
5.5%
Avg BSR
#110
Page quality
0%
Prime
93%
Sponsored
89%
Out of stock
1.4%
Avg brand age
41 months
Avg seller age
200 days

Competition & brand share

The top 5 products take 55% of clicks — established leaders, but buyers still shop beyond them.

Brands

18 rising

Sellers

24

Top-5 brand share

74%

Top 20: 100%

Top-5 click share

55%

Top 20: 91%

Open market

23%

  • IWISS25%
  • aninako22%
  • YFFSFDC14%
  • Yaesport9%
  • Yosoo3%
  • MINAKIKO3%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — -1.6% search growth over the last 90 days.
2K1KHoliday '24Prime Day '25Black Friday '25Spike '26SepDecMarJunAugNovMarMay

Peak months: Aug · busiest ÷ quietest = 1.6×

Top mc4 コネクタ products on Amazon

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%5%¥337K10%¥674K15%¥1.0M20%¥1.3M1101001K10K Reviews — right = deep review moat Market share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 24 tracked products in this niche — three views at once, no toggling.

What buyers say about mc4 コネクタ

What buyers praise and complain about, mined from review topics.

What buyers love

使用の容易さ41%

“普通に使えます”

総合品質22%

“DIYでちょうど良いです数”

耐久性9%

“あとは耐久性ですね”

コストパフォーマンス9%

“コスパ良い”

接続性 - 全体6%

“MC4コネクタ接続はこれがベストです。”

正しい内容3%

“予備を考慮して適当な数になっております”

組み立て/インストール3%

“コネクター取り付けが楽にできます”

質感/一貫性全体2%

“質感はよいと思います”

充電2%

“しっかりと充電出来ています。”

ロック機構1%

“接続時はしっかり「カチッ」と固定されて安心感があります。”

What buyers complain about

使用説明書/ユーザーマニュアル/トラブルシューティング17%

“組み立て方法の説明書なしは残念”

サイズ全体17%

“あとレンチサイズは全く違いました”

硬い感覚8%

“端子部分さしこみがなかなかの硬さです。”

使用の容易さ8%

“意外と扱い難い”

厚み8%

“銅線が細くて発熱する”

総合品質8%

“安かろうそれなり”

コネクタ/ポート/プラグ8%

“時々コネクタの接触不良が発生し、発電出来なくなる事があるため、意を決してコネクタ交換をしました。”

薄い8%

“少し薄型です”

組み立て/インストール8%

“取り付けレンチが使えない. ケーブル側の頭に、今までの取り付けレンチが入らず締め付けに苦労しました。”

強さ3%

“固すぎます”

Top return reasons

接続性 - 全体25%
薄い19%
不良材料/部品16%
サイズ全体13%
充電6%
組み立て/インストール6%
機能全体6%
互換性-全体6%
広告と実際の製品の違い3%

Common questions

Is mc4 コネクタ profitable to sell on Amazon Japan?
The niche generates ¥6.7M/yr across 27 tracked products. 90-day search growth is -1.6%. Flapen's verdict: Worth a look (61/100).
How competitive is the mc4 コネクタ niche?
18 brands and 24 sellers compete. The top 5 products take 55% of clicks and top 5 brands hold 74% of demand.
What do buyers complain about in mc4 コネクタ?
Top complaints mined from reviews: 使用説明書/ユーザーマニュアル/トラブルシューティング, サイズ全体, 硬い感覚. The return rate is 0.6%.
When does demand for mc4 コネクタ peak?
Demand peaks in Aug; the busiest month runs 1.6× the quietest.
What does it cost to enter the mc4 コネクタ niche?
Listings span ¥588.50–¥10574.84; the average listing price is ¥2951.44 (sweet spot $15–$100). The average incumbent carries 162 reviews — the moat a new listing must climb.