<font color="red"> What do the comparable tractors have; such as tc29/33,
b2910 or
l3130, and dear 4210/4310. </font>
The
B2910 has a pretty light alternator. I don't recall exactly, but I think mine might have be about 25 or 30amp?
The alternator size only becomes an issue if you add a bunch of lights and if you use them a lot. I only use one of my tractors at night, it has extra lights (5 of them) and a 40 amp alternator. However since I don't use it extensively, I would have put the same 5 lights on even if the alternator was smaller and could not keep up with the draw on the battery. Drawing the battery down too far/too often is a problem, it will shorten battery life. Drawing it down little bits for short durations is no big deal because the alternator, even a small one, will recharge the battery when the tractor is used during daylight hours and the lights are off.
Now I'm not trying to say its a good idea to draw the battery down, it is not, I'm just pointing out that it can be done WITHIN REASON without much worry.
A bigger alternator IS BETTER if you add lights/electric loads. Kioti sets itself apart by offering larger alternators on all its tractors and that is a good selling point and it is a nice added value if you use it. A bigger alternator doesn't do anything if you don't use it. Personally, I'd always prefer a bigger alternator over a smaller one, but I wouldn't rule out any tractor because of the alternator size UNLESS there was a compelling reason for me to make sure it was a large unit (like I knew I'd be working at night 50% of the time).