---
title: "30 Amp Generator Inlet Box — $491K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/patio-lawn-garden/30-amp-generator-inlet-box"
last_updated: "2026-08-09T16:19:37.836Z"
locale: en
meta:
description: "Niche score 43/100 · $491K/yr market · 224K searches/yr · $46.52 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 43/100 · $491K/yr market · 224K searches/yr · $46.52 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "30 Amp Generator Inlet Box — $491K/yr Amazon US Niche (2026) - Flapen"
---
# **30 amp generator inlet box**
**Skip it**
Soft demand (-62.5% this quarter) — this niche doesn't clear our bar today.
Market size 59Growth 0Conversion 56Competition 28Returns 56Price range 95Avg price 94Brand share 36Review moat 72Quality gap 16
**Price range**
**Incredible****$16.95–$90.45**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Great****$46.52**
avg listing price — sweet spot $15–$100
**Review moat**
**Good****606.6**
avg incumbent reviews — the moat a new listing must climb
**Market size**
**Good****$491K**
$491K/yr · 224K searches
**Conversion**
**Good****4.7%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Good****2.8%**
return rate — above 5% kills the launch gate
**Brand share**
**Okay****83%**
top-5 brand share — brands hold most of the demand
**Competition**
**Okay****68%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Bad****4.8★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-62.5%**
90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, 30 amp generator inlet box is a $491K/yr Amazon United States market (224K searches/yr). The top 5 brands hold 83% of demand. Demand peaks in Jan–Feb–Oct. Verdict: Skip it — 43/100.
Data updated Jul 23, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **30 amp generator inlet box market data**
- **Units sold / yr**
- **10K–13K**
- avg 250–500/product
- **Revenue / yr**
- **$465K–$582K**
- units × avg price
- **Conversion rate**
- **4.7%**
- **Avg BSR**
- **#29**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **90%**
- **Out of stock**
- **7.2%**
- **Avg brand age**
- **41 months**
- **Avg seller age**
- **189 days**
## **Competition & brand share**
The top 5 products take 68% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**13 **▼falling
**Sellers**
**55**
**Top-5 brand share**
**83%**
Top 20: 100%
**Top-5 click share**
**68%**
Top 20: 100%
**Open market**
**14%**
- RVMATE38% - RVINGPRO18% - CircleCord16% - SURAIELEC7% - Connecticut Electric4% - Reliance Controls3% - Open — no brand owns it (7 brands, 14%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -62.5% search growth over the last 90 days.
20K15KSpike '24Spike '25Prime Day '25Spike '26Prime Day '26 seasonSepDecMarJunAugNovMarMay
Peak months: Jan, Feb, Oct · busiest ÷ quietest = 3.4×
[**Open Trend **](https://flapen.com/research/us/patio-lawn-garden/30-amp-generator-inlet-box/trend)
## **Top 30 amp generator inlet box search terms**
- **30 amp generator inlet box**69K/yr-67.2%3.9% conv. - **generator inlet box**27K/yr-65.4%2.5% conv. - **power inlet box**18K/yr-61.4%0.9% conv. - **generator inlet**11K/yr-66.7%3.2% conv. - **generator outlet**9K/yr-54.0%1.4% conv. - **generator power inlet box**10K/yr-63.0%1.3% conv. - **generator inlet box 30 amp kit**8K/yr-57.3%3.1% conv. - **30amp generator inlet box**12K/yr-75.3%4.3% conv. - **30 amp inlet box**8K/yr-55.3%4.0% conv. - **30 amp power inlet box**7K/yr-48.8%3.2% conv. [**All search terms **](https://flapen.com/research/us/patio-lawn-garden/30-amp-generator-inlet-box/search-terms)
## **Top 30 amp generator inlet box 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%10%$49K20%$98K30%$147K40%$197K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 20 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Pre-Drilling 30 Amp Generator Inlet Box NEMA L14-30P Power Inlet Box**RVMATE**$29.05**4.8★427 rev](https://www.amazon.com/dp/B09V9Z4X9D) [2**CircleCord 30 Amp 4 Prong Generator Power Inlet Box NEMA L14-30P Power Inlet Box for 4 Prong Generator Cord 125/250 Volt 7500 Watts Weatherproof Outdoor Use for Emergency Ready ETL Listed**CircleCord**$24.02**4.7★300 rev](https://www.amazon.com/dp/B09SF1MFT4) [3**RVINGPRO 30 Amp Generator Cord 25FT and Power Inlet Box Pre-Drilled 30 Amp Generator Inlet Box with Cord NEMA L14-30P to L14-30R Generator Cord Waterproof Combo Kit ETL Listed**RVINGPRO**$67.31**4.8★662 rev](https://www.amazon.com/dp/B09X9Z7RQ8) [4**RVMATE Pre-Drilling 50 Amp Generator Inlet Box NEMA SS2-50P Inlet Box**RVMATE**$31.33**4.7★575 rev](https://www.amazon.com/dp/B09VBD946C) [5**RVINGPRO 30 Amp Generator Cord 15FT and Power Inlet Box Pre-Drilled 30 Amp Generator Inlet Box with Cord NEMA L14-30P to L14-30R Generator Cord Waterproof Combo Kit ETL Listed**RVINGPRO**$59.80**4.8★662 rev](https://www.amazon.com/dp/B09X9MHP45)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**SURAIELEC 50 Amp Generator Power Inlet Box NEMA SS2-50P Generator Box for 3-Prong Generator Cord 120/240V 12000W Weatherproof Outdoor Outlet Receptacle**SURAIELEC**$68.02**134 rev1y ago](https://www.amazon.com/dp/B0DLNXNYNF) [**Islewire 30 Amp Generator Power Inlet Box Pre-drilled NEMA L14-30P Box for 4-Prong Generator Cord 125/250V 7500W Weatherproof NEMA 3R for Outdoor Use LED Indicator Emergency Ready ETL Listed**islewire**$18.50**31 rev1y ago](https://www.amazon.com/dp/B0DG4QL6NK) [**SURAIELEC 30 Amp Generator Power Inlet Box NEMA L14-30P Generator Box for Generator Cord 120/240V Weatherproof Outdoor Outlet Receptacle Outlet ETL Listed Ready for Emergency Use**SURAIELEC**$57.18**149 rev1y ago](https://www.amazon.com/dp/B0CR9ZGGGF) [**VEVOR 30 Amp Generator Cord and Power Inlet Box Kit 25 FT Generator Extension Cord NEMA L14-30P/L14-30R STW 10 AWG with Twist Lock Connector Pre-Drilled Inlet Box ETL Listed**VEVOR**$62.95**245 rev2y ago](https://www.amazon.com/dp/B0D53RT4HC) [**OPL5 30AMP Generator Power Inlet Box with Pre Punched Knockouts NEMA L14-30P for 4 Prong Generator with LED Indicator Light 125/250 Volt 7500 Watts for Outdoor Use ETL Listed (L14-30P)**OPL5**$16.95**9 rev3y ago](https://www.amazon.com/dp/B0C9DKX68D)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**OPL5 30AMP Generator Power Inlet Box with Pre Punched Knockouts NEMA L14-30P for 4 Prong Generator with LED Indicator Light 125/250 Volt 7500 Watts for Outdoor Use ETL Listed (L14-30P)**OPL5**$16.95**5.0★**▲ 159%**](https://www.amazon.com/dp/B0C9DKX68D) [**CircleRiver 50 Amp 15Feet Generator Cord and Power Inlet Box Combo Kit NEMA 14-50P Male to SS2-50R STW 6/3+8/1 AWG 125/250V Twist Locking with Inlet Box for Generator to House**CircleRiver**$90.45**4.8★**▲ 113%**](https://www.amazon.com/dp/B0BL2HX3P5) [**Islewire 30 Amp Generator Power Inlet Box Pre-drilled NEMA L14-30P Box for 4-Prong Generator Cord 125/250V 7500W Weatherproof NEMA 3R for Outdoor Use LED Indicator Emergency Ready ETL Listed**islewire**$18.50**4.9★**▲ 94%**](https://www.amazon.com/dp/B0DG4QL6NK) [**CircleCord 30 Amp 4 Prong Generator Power Inlet Box NEMA L14-30P Power Inlet Box for 4 Prong Generator Cord 125/250 Volt 7500 Watts Weatherproof Outdoor Use for Emergency Ready ETL Listed**CircleCord**$24.02**4.7★**▲ 69%**](https://www.amazon.com/dp/B09SF1MFT4) [**30-Amp Generator Inlet Box NEMA L14-30P RV Generator Power Inlet Box Indoor/Outdoor Waterproof Transfer Switch PB30 Inlet Box Plug 4 Prong 125/250 Volts Up to 7 500 Watts ETL Listed**BESYL**$24.87**4.9★**▲ 50%**](https://www.amazon.com/dp/B08YWPT2D4)
**~~View all trending →~~**
## **What buyers say about 30 amp generator inlet box**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**27%
*“looks well made”*
**Assembly/Installation**20%
*“The box works as expected with a clean installation”*
**Advertised Vs Actual Product**14%
*“As advertised”*
**Value For Money**10%
*“Great value”*
**Design-Overall**3%
*“WELL CONSTRUCTED”*
**Durability**3%
*“durability and ease”*
**Strength**3%
*“Seems very sturdy”*
**Size-Overall**3%
*“Nice fit”*
**Connectivity-Overall**2%
*“makes it easier to connect you generator cable”*
**Weight Heavy**2%
*“Very nice heavy duty product”*
### **What buyers complain about **
**Rusts/Corrodes**19%
*“Box will rust”*
**Mounting**17%
*“The terminal screw tightening mechanism is poor quality”*
**Assembly/Installation**15%
*“didn't work for my set up”*
**Quality-Overall**6%
*“The reason for the one star review is purely quality control”*
**Advertised Vs Actual Product**6%
*“They can falsely claim listing on here”*
**Metal Quality**6%
*“-2 more stars for not being steel as advertised”*
**Weight Heavy**4%
*“much heavier than I expected”*
**Size-Overall**3%
*“the box is small”*
**Thickness**3%
*“Tighter than a”*
**Water Resistance**2%
*“I do not know what they consider waterproof as the two inside screws on the cover are rusting out”*
### **Top return reasons **
**Size-Overall**33%
**Value For Money**14%
**Defective Material/Parts**8%
**Advertised Vs Actual Product**8%
**Functionality-Overall**6%
**Connectivity-Overall**5%
**Quality-Overall**4%
**Assembly/Installation**4%
**Compatibility-Overall**3%
**Socket/Port/Plug**3%
## **Common questions**
- **Is 30 amp generator inlet box profitable to sell on Amazon United States?**
- The niche generates $491K/yr across 20 tracked products. 90-day search growth is -62.5%. Flapen's verdict: Skip it (43/100).
- **How competitive is the 30 amp generator inlet box niche?**
- 13 brands and 55 sellers compete. The top 5 products take 68% of clicks and top 5 brands hold 83% of demand.
- **What do buyers complain about in 30 amp generator inlet box?**
- Top complaints mined from reviews: Rusts/Corrodes, Mounting, Assembly/Installation. The return rate is 2.8%.
- **When does demand for 30 amp generator inlet box peak?**
- Demand peaks in Jan–Feb–Oct; the busiest month runs 3.4× the quietest.
- **What does it cost to enter the 30 amp generator inlet box niche?**
- Listings span $16.95–$90.45; the average listing price is $46.52 (sweet spot $15–$100). The average incumbent carries 607 reviews — the moat a new listing must climb.
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