RVMP Flex Power® 4000e RV Generator | 4000 Watt EFI Dual-Fuel 4L1-RV401-EFI (EM)

The RVMP Flex Power 4000e Mini delivers a full 4000 watts from one of the smallest installed packages in its class - 22 inches long, which is what makes it fit coaches that will not take a full-size set. Dual-fuel EFI, inverter-grade output, permanently installed.

Features

• Full 4000 W output from a 22-inch case - roughly 7 inches shorter than the full-size 4000e
• Dual-fuel operation, gasoline or propane
• Electronic fuel injection for efficiency at varying load
• Inverter-grade power, clean enough for sensitive electronics
• Variable engine speed from 2600 rpm, so it loafs at light load
• Low-oil and overheat shutdown, plus fire-prevention valve control
• Designed for permanent installation in RVs, vans and campers

Specifications

• Output. 4000 W on gasoline, 3600 W on propane. 117-120 V, 60 Hz, 33.3 A gas / 30 A LP.
• Engine. 224cc, single-cylinder, 4-stroke OHV, air-cooled, EFI, variable 2600-3600. Oil capacity 0.9 L.
• Fuel burn. Gasoline 0.12 gal/hr no load, 0.30 at half, 0.60 at full. Propane 0.79 lb/hr no load, 2.2 at half, 3.3 at full.
• Power quality. Total harmonic distortion ≤3%, multi-pole brushless PM alternator with digital voltage regulation.
• Size and weight. 22" L x 16.9" W x 13.4" H, 87 lb (39.5 kg).
• Certification. 50-state CARB compliant.

One figure worth confirming. RVMP's spec table says 87 lb; RVMP's own owner's manual for the same unit says 50 kg (110 lb) without the bracket. Those cannot both be right, and the difference matters if you are designing a mount - ask us and we will get it confirmed before you cut anything.

Which model is this? This is the 4000e Mini (RVMP part 4L1-RV401-EFI (EM)), which RVMP also writes as 4000em and 4000eᵐ. It is NOT the same machine as the full-size 4000e (4L1-RV401-EFI): that one is 29.5 in long against this one's 22 in, and runs a different speed range. Same output, different box. If you are replacing an existing set, the length is usually what decides it.

This is a hardwired installation, not a plug-in. There are no receptacles on the machine. Output lands on 10 AWG hot, neutral and ground leads that run through a 30 A breaker into a transfer switch or the coach's AC distribution panel. Budget for the install, and talk to us about the transfer switch if the coach does not already have one.

No carbon monoxide shutoff. RVMP does not fit CO sensing to the installed Flex Power generators — they have low-oil and overheat shutdown and a fire-prevention valve controller, but nothing that detects CO. RVMP's own manual says to have a working carbon monoxide detector in the coach. If CO shutoff is a requirement for you, say so and we will point you at units that have it.

Altitude — read this before you size it

RVMP's own owner's manual states that generator power decreases approximately 3.5% of rated power for every 1,000 ft above sea level. That figure is in the manual, not on the product page, and it is the single most important number for anyone buying an RV generator in Colorado. Applied to this machine's 4,000 W gasoline rating:

• Denver, ~5,280 ft: about 18% off — roughly 3,261 W instead of 4,000 W.
• Colorado Springs, ~6,035 ft: about 21% off — roughly 3,155 W instead of 4,000 W.
• Monument / Palmer Divide, ~7,000 ft: about 24% off — roughly 3,020 W instead of 4,000 W.
• Leadville / high passes, ~9,000 ft: about 32% off — roughly 2,740 W instead of 4,000 W.

This is not a defect and it is not specific to RVMP — every naturally aspirated engine does it. It matters here because RV air conditioners draw their biggest current at startup, and a set that starts the A/C at sea level may not start it at 7,000 ft. Tell us the elevations you actually camp at and we will size against these numbers rather than the sticker.

Warranty. RVMP's product page says two years; RVMP's own owner's manual for this line says three. We are not going to print a term we cannot stand behind — ask us and we will get it in writing from RVMP before you buy.