what is horse power rating of motor

There's an easy way to calculate the power of an electrical motor. First you multiply the volts times the amps to find the total power in watts, in this case 120 volts times 13.5 amps equals 1,620 watts. Next, you figure in an average 85% efficiency for electric motors to get 1,377 watts. (It's fair to assume this low-cost AC appliance uses a typical AC induction motor which is probably more like 80% efficiency, and the manufacturer doesn't claim anything better, but let's give them the benefit of the doubt since there are some electric motors that exceed 95% efficiency.) Then, you consider that you'll always be using this while plugged into an extension cord. Let's say it's the typical $30 14 gauge, 50 foot cord that's common (but be aware that longer or shorter cords, or higher or lower wire gauge, will change this) and factor in another 3% drop in power, so you have 1,335 watts at the machine.Now, 1335 watts is about 1.8 horsepower. If you're comparing this to the popular Mantis 16 inch tiller, with a 4-stroke Honda GX35 gas engine, that has 1.3HP at 7,000rpm. So on paper, this is 38% more powerful, but there are lots of other differences. It has a very different tine shape, but of course caring for a gas engine and getting virtually unlimited portability, vs. a maintenance-free electrical motor while tied to a power cord, are also big differences. TL,DR: This is more powerful in most cases than its gas competitors, and that's important but it's not the only consideration.

has anyone compared the 12 amp model to the 13.5 amp one? is it worth spending the extra money to get the 13.5 amp tiller?

Our soil here in Montana has a lot of clay and turns rock hard when dry. I have the 13.5 but to keep it from dancing all over the place I put a fifty pound lead weight on it to hold it down. With the extra weight it does a great job

Is 13.5 amps too much for a 15 amp circuit?

You will be fine on a 15A circuit. Recommendations from the manufacturer are 14/3 (14gauge 3conductor) extension cord for up to 50ft and 12/3 extension cord for up to 100ft. Total length should not exceed 100ft however I'm sure a 10/3 extension cord would be fine for more than 100ft but a 10/3 extension cord would be very expensive. Please be aware that the tiller pulls the most current with the tines are digging deep in the soil and the motor is bogging down and under extreme strain it's possible it might pop the breaker on a 15A circuit.

Can tines be removed for narrower tilling area?

yes, but...the tines are an assembly of 3 held to the shaft with a through bolt. If you removed one assembly you could till with just one side, but the tiller is still over a foot wide and the empty shaft is still sticking out even without the tines. this is a powerful machine, I would look at a lighter, narrower tiller if you want to do a more narrow area.

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Sun Joe TJ604E 16-Inch 13.5 AMP Electric Garden Tiller/Cultivator

Sun Joe TJ604E 16-Inch 13.5 AMP Electric Garden Tiller/Cultivator

Product ID: 334274676

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Details

Brand
Sun Joe
Colour
Black
Power Source
Electric
Material
Alloy Steel
Item Weight
27.08 Pounds

⚡13.5 AMP electric power

🌱16-inch wide cultivation

🔧6 steel angled tines

Description

🌿 Cultivate your green space like a pro—power, precision, and portability in one!

BUILT TO LAST - Durable alloy steel with 6 angled tines ensures maximum performance season after season.
COMPACT CONVENIENT - Foldable handle design for effortless storage and transport—perfect for urban gardeners.
CUSTOMIZABLE CONTROL - 3-position wheel adjustment lets you tailor tilling depth and maneuverability.
WIDE REACH LESS EFFORT - Cultivates a generous 16-inch wide path for faster soil prep.
POWER THROUGH YOUR GARDEN - Robust 13.5 AMP motor delivers deep, efficient tilling up to 8 inches.

The Sun Joe TJ604E is a powerful 13.5 AMP electric garden tiller featuring 6 durable steel angled tines that cultivate up to 16 inches wide and 8 inches deep. Its foldable handle and 3-position adjustable wheels make it easy to store and customize for efficient soil preparation, ideal for millennial professionals seeking a reliable, space-saving gardening tool.

Specifications

Brand	Sun Joe
Colour	Black
Power Source	Electric
Material	Alloy Steel
Item Weight	27.08 Pounds
Operation Mode	Electric
Global Trade Identification Number	00810829024718
UPC	343538914303 702872674623 343538916345 343538367659 810829024718 343538293514
Item model number	TJ604E
Product Dimensions	45.72 x 53.34 x 132.08 cm; 12.28 kg
ASIN	B01DTIC79Q