30 amp generator inlet box
Skip itSoft demand (-62.5% this quarter) — this niche doesn't clear our bar today.
Price range
Incredible$16.95–$90.45cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Great$46.52avg listing price — sweet spot $15–$100
Review moat
Good606.6avg incumbent reviews — the moat a new listing must climb
Market size
Good$491K$491K/yr · 224K searches
Conversion
Good4.7%search→purchase rate — share of searches ending in a sale
Returns
Good2.8%return rate — above 5% kills the launch gate
Brand share
Okay83%top-5 brand share — brands hold most of the demand
Competition
Okay68%top-5 click share — leaders hold, buyers still browse
Quality gap
Bad4.8★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
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.Peak months: Jan, Feb, Oct · busiest ÷ quietest = 3.4×
Top 30 amp generator inlet box search terms
- 30 amp generator inlet box69K/yr
- generator inlet box27K/yr
- power inlet box18K/yr
- generator inlet11K/yr
- generator outlet9K/yr
- generator power inlet box10K/yr
- generator inlet box 30 amp kit8K/yr
- 30amp generator inlet box12K/yr
- 30 amp inlet box8K/yr
- 30 amp power inlet box7K/yr
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.
All 20 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Pre-Drilling 30 Amp Generator Inlet Box NEMA L14-30P Power Inlet Box
RVMATE$29.054.8★427 rev
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$24.024.7★300 rev
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$67.314.8★662 rev
RVMATE Pre-Drilling 50 Amp Generator Inlet Box NEMA SS2-50P Inlet Box
RVMATE$31.334.7★575 rev
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$59.804.8★662 rev
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$68.02134 rev
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$18.5031 rev
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$57.18149 rev
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$62.95245 rev
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$16.959 rev
Trending
90-day click momentumOPL5 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$16.955.0★
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$90.454.8★
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$18.504.9★
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$24.024.7★
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$24.874.9★
What buyers say about 30 amp generator inlet box
What buyers praise and complain about, mined from review topics.What buyers love
“looks well made”
“The box works as expected with a clean installation”
“As advertised”
“Great value”
“WELL CONSTRUCTED”
“durability and ease”
“Seems very sturdy”
“Nice fit”
“makes it easier to connect you generator cable”
“Very nice heavy duty product”
What buyers complain about
“Box will rust”
“The terminal screw tightening mechanism is poor quality”
“didn't work for my set up”
“The reason for the one star review is purely quality control”
“They can falsely claim listing on here”
“-2 more stars for not being steel as advertised”
“much heavier than I expected”
“the box is small”
“Tighter than a”
“I do not know what they consider waterproof as the two inside screws on the cover are rusting out”
Top return reasons
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.