I am afraid that 1200W is too low, even though Cricket SX-3 and RX-5 use 1000w 36V motors, but I have no clue what kind of motors they are using.

they're using PMDC motors (non brushless)

as can be seen in their wiring diagram

https://cricketminigolfcarts.com/wp.../Cricket_RX5_36VwVoltageRegwSpeed-Control.pdf
(two wires on the motor is a dead giveaway

)

those can push a bit more torque than BLDCs

"10 - 13 mph" however I'd highly doubt...

I mean sure.. once that cart is moving and on level paved ground..

with just a single small driver (110lbs or less) it won't need

no power;

150-160 watts perhaps... maybe 300 with a pebble in the way.

but to GET the cart moving does require a decent push.. and that... I doubt the 1kW motor is capable.

Since we just talked about these kinds of motors and misconceptions

about PMDC vs BLDC

I happen to remember the Unite My1020 PMDC in a 48V 1000W configuration happens to be able to push 4.05Nm of torque peak

And with the 45Nm I think I remember you need

that'd need a 11:1 gear ratio to work

(but it won't be happy about it and die if tryed once too often)

and that'd be 11mph.. so just about right

considering their claim of "10 - 13 mph "

on the lower end of things, and not exactly nice to the motor

(one hill and it'll cook it's coils and magnets off really)

"stitched with a hot needle" as we say around here...

Frankly, that alone would lead me to believe those guys are not exactly selling stuff to make their customers happy

Maybe a "Yalu BM1109" if you can find one (1800W BLDC)

it's still very much on the edge but should almost work with a 10:1 gear ratio

and again no.. 4.1:1 ratio is never ever going to cut it (not without a motor that's not providing 10.8Nm

)

and if you get a small one that does via internal gearing..

then it again comes at the cost of reduced speed.

'sid

PS I'll recalc, but I don't have high hopes

Okay.. here goes.

here's the math explanation
I use sine of six here since a golf cart has to tackle smooth but uneven terrain quite usually and

sometimes the grassy hills are steeper than your average road .. feel free to adjust.

275kg * 9.81 kgm/s² * sin(6) = 282 N

282N * 6.7 m/s = 1889.4 Watts

So for 606lbs total weight up a 10% inline slope at 15mph you need a motor power of 1890 Watts (mechanical)

and that's in an ideal frictionless setup ...

let's try some compromise values...

270 kg * 9.81kgm/s² * sin(4) = 185 N

185N * 4.5 m/s = 832.5 Watts

better!

that means 595 lbs up a ~7% incline slope at just 10mph and is likely a more reasonable guess for the performance of that cricketcart therefor

Now let's see if we can move closer to your target:

your min targeted speed (13mph)... 5.811 m/s

means for a 1kW motor

we're left with

1000 Watts / 5.811 m/s = 172.1 N

172.1 N for a 600 lbs kart means

172.1 N / ( 272 kg * 9.81kgm/s²) = 0.0645 or sin(3.698)

so with your intended setup you cannot climb any hill with a slope of more than 6.45% (which is an angle of 3.7° roughly)

but let's say that'll do the trick for you

with a 13" wheel and 272kg of weight you need a wheel torque of indeed 44.9 Nm

let's call that 45!

with the just over 4Nm of torque you need a 11.1:1 ratio (elevenoneone!! LOOOL)

unfortunately that motor wouldn't run quick enough to get to 13mph at that ratio

(it'd run ~2900 rpms and reach maybe 10mph up the hill.. ~3400 and 12mph on level ground)

but yeah.. that's about as good as it gets I'm afraid with as little motor power

'sid