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Firman P03501 Spec Review

The Firman P03501 is a portable open frame generator with a rated wattage of 3550 W and a starting wattage of 4450 W.

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Description

The P03501 is an open frame portable generator with a bonus cover and wheel kit. With an ergonomic handle and never-flat wheels, this generator is easy to transport for those weekend camping getaways or portable backup power. It features 4450 starting watts and 3550 running watts, with a reliable recoil start system. (source: Firman (opens in a new tab))

Zoom on the Firman P03501

In summary, the Firman P03501 is a portable generator especially useful for:

  • RV travellers looking for even more independence
  • People occasionally participating in sporting competitions, open-air performances and outdoor festivals
  • Homeowners who want to be able to use the most necessary devices in their household, even during a blackout

In the sections ahead, the power characteristics, availability of various outlets, the portability, and any additional features of the device shall be discussed, including its emission compliance information.

Power & Run Time

The Firman P03501 in use

The Firman P03501

The Firman P03501's design includes a gasoline-fueled 208 cc Firman Max-Pro Series OHV 4-stroke engine. With a 120V output, it gives a running wattage of 3550W and also a peak wattage of 4450W.

Enjoying a noise rating of 67 dBA (less noisy than a normal conversation), this generator gets running thanks to a simple traditional pull-start mechanism.

Thanks to a fuel capacity of 5 gallons, the P03501 can operate for around 14 hours at 50% load with a full tank (fuel consumption around 0.36 GPH).

The P03501 is unsuitable for the powering of sensitive electronic devices due to its relatively high THD (<25%).

Outlets

The control panel features the following 4 AC outlets:

Duplex 120V 20A (5-20R)
120V 30A (L5-30R) receptacle
120V 30A (TT-30R) receptacle

This Firman generator is RV Ready, thanks to its TT-30R receptacle (TT stands for 'Travel Trailer').

Portability

The Firman P03501 has a conventional, open frame design, of the following dimensions: L24.8 x W21.7 x H21.7 in, which offers support and allows it to be raised above ground level. The design is ideal for rough environments and demanding outdoor use.

Even though this device may be technically portable (as in movable), manipulation and transportation without special equipment can be a challenge, as it weighs 108.5 pounds. However, its challenging mobility is solved by its wheel kit (⌀8") and its folding handle, which will ease its displacement, once it is on the floor.

Features

Panel of the Firman P03501

The P03501's control panel

The P03501's status and activity may be monitored conveniently via the control panel, as it features a convenient meter showing you voltage, frequency and lifetime hours.

In addition to this info, a light indicator allows you to instantly see if the oil level is too low.

A built-in fuel gauge allows for a quick, easy and convenient check of the fuel level of the generator.

From a security point of view, the generator is equipped with an overload protection (circuit breaker) and an automatic low oil shut-off, giving you a peace of mind during use.

While the standard documentation and an owner's manual (opens in a new tab), helpful for starting the device promptly, come with the Firman P03501, the following accessories are also included: cover, oil, funnel and tool kit.

Emissions

The Firman P03501 is EPA approved, but NOT CARB-compliant. Thus, it cannot be purchased or sold in California.

However, it features a spark arrestor, which makes it suitable for use in forested areas.

Product Videos

The Firman P03501 versus other generators

The following charts are provided to give you an idea of how some of the key specs of the Firman P03501 compare to generators of similar power (between 3500 and 4500 W).

  • With a dry weight of 108.5 pounds, the Firman P03501 finds itself in the expected weight range for generators able to produce between 3500 and 4500 rated watts. In terms of weight, one of the champions in their power range is the WEN GN400i, standing at just 66.1 lbs.
  • Since the generator's noise is rated at 67 dBA, it has the roughly average expected noise for a device of similar power. If you’d prefer a less noisy device, one of the most quiet devices, which share the same power range with this one, is the Cummins Onan P4500i, whose lowest noise levels reach just 52 dBA.
  • As the P03501 features an autonomy of around 14 hours at 50% load, it has a higher run time than an average generator of its power range. If autonomy is your priority, one of the devices of a similar power output with the highest run time is the Predator 4375, reaching around 16 hours.
  • While the run time is an important parameter, it is dependent on the fuel tank’s capacity and thus, doesn’t say much on its own unless we consider fuel consumption as well. This generator has an estimated fuel consumption of roughly 0.36 GPH (gallon per hour) at a 50% load, rendering it somewhat average compared to devices of a similar output. If fuel consumption is your top priority, we suggest to check out the Westinghouse iGen4200, which has a fuel consumption of only 0.17 GPH and thus, is one of the most efficient devices in our database.
According to our stats, the following comparison is pretty popular: Firman P03501 vs Firman P03602.

Price comparison

As you can see from this interactive chart, when compared to other 3500-4500W generators, the Firman P03501 is on the average side of the price range.

Therefore, this generator nicely fits in the expected budget for this kind of product.

The bottom line

STRENGTHS:
  • In the expected price range
  • Several accessories included
  • RV Ready
  • High run time
AVERAGE SPECS:
  • Decent weight (108.5 lbs)
  • Acceptable noise (67 dBA)
  • Decent fuel efficiency
WEAKNESSES:
  • No electric start
  • Not CARB-compliant

Do you own the Firman P03501 and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

Features and Specifications

General
InverterNo
PortableYes
Parallel capableNo
RV readyYes
FuelGasoline
Engine208 cc Firman Max-Pro Series OHV 4-stroke
Starting systemRecoil
Power
VoltageAC: 120V 60 Hz
Running watts3550 W
Starting watts4450 W
Running amps29.6 amps
Peak amps37.1 amps
Run time @50% load14 h
Run time @25% loadUnknown
Features
GFCI outletsNo
Covered outletsYes
Automatic Voltage RegulationYes
AC outlets
  • 1x Duplex 120V 20A (5-20R)
  • 1x 120V 30A (L5-30R)
  • 1x 120V 30A (TT-30R)
DC outletsNo
Data centerVFT
IndicatorsLow oil
Fuel tankSteel, 5 gal
Fuel gaugeYes
Misc
Weight108.5 lbs
Approx. dimensions (L x W x H)24.8 x 21.7 x 21.7 in
Noise (lower limit)67 dBA
THD< 25%
EmissionsEPA
SecurityLow oil and overload protection
Spark arrestorYes
NeutralBonded to frame
Accessories includedOil, funnel, tool kit, cover, and wheel kit
Warranty3 years
SeriesPerformance

Unlike many websites, we did our best to research each of the specs above. That being said, we are not immune to making the occasional mistake or omission. Should you notice any missing or incorrect values, don't hesitate to suggest improvements so we can address the issue.

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About FIRMAN Power Equipment

Founded in 1999, Firman Power Equipment is a company with a short, but established history in the power equipment industry. Based in Arizona, the company offers an immense range of products, including power tools, automotive equipment, storage utilities, work wear, but most importantly, a wide selection of generators of all sizes, designs and outputs. Interestingly, Firman is a wholly owned subsidiary of the China National Machinery Industry Corporation - a somewhat well renowned company in China and acts as a de facto distributor of their products in the US.

Warranty Information

The Firman P03501 is covered under a warranty for up to 3 years. This warranty may be limited and may not cover all parts of the generator.
For more information about the warranty of Firman generators, please consult Firman's warranty policies (opens in a new tab). Alternatively, you can also contact their Customer Support: 1-844-FIRMAN1 (844-347-6261).

Questions & Answers

What can it power?
Examples of items that can be simultaneously powered.
The examples below are based on a maximum load of 80% and estimated wattages. For a more accurate estimation, use our generator sizer.
ItemRunning WattsStarting Watts
At homeRefrigerator (energy star)1921192
Hair dryer18001900
Freezer8101750
Total2802 W3802 W
For campingRadiant heater13001300
RV refrigerator180600
RV AC (11,000 BTU)10101600
Slow cooker270270
Set of 5 LED light bulbs5555
Total2815 W3405 W
For workGrinder14002500
Demolition hammer12601260
Bug zapper8080
Total2740 W3840 W
What type motor oil does it take. Firman 208cc.? (Asked February 19, 2021)

SAE 10W-30 is recommended for general, all-temperature use. You may also want to refer to the chart page 12 of the owner's manual (opens in a new tab).

firman 3501 valve lash specs? (Asked August 17, 2021)

Intake/Exhaust: 0.004 - 0.006 in.

What do the symbols mean on the multimeter?.. there's 4 different areas.. (Asked September 15, 2021)

The multimeter and its symbols are explained page 10 of the owner's manual (opens in a new tab).

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