保加利亚采购需求：卡车空调，推荐产品

I'm looking to purchase an air conditioner suitable for my tractor, but I have some specific requirements due to uneven ceiling heights in my vehicle. The external unit needs to be compact, with a maximum dimension of 55cm x 55cm, to fit in the flat section. I'm wondering if you have smaller units available, even if that means the cooling power is slightly lower. Additionally, it's essential that the air conditioner operates efficiently with my generator, which has a capacity of 50 amps. Could you provide information on any models that meet these specifications? I'm particularly interested in understanding their power requirements and overall performance to ensure they align with my setup.