ZRD series dual axis solar tracker: have two automatic axis to track the sun in east-west direction and south-north direction automaticlly.
ZRS series dual axis solar tracker: one axis track the sun in east-west direction automatically, one manual axis to track the sun in south-north direction (manual adjustment 4 times a year).
Advantages:
1.Simplest structure, lowest cost.
2. Install conveniently and quickly, no need for big machinery.
3. Less power consumption, only totally less than 5kW·h/set/year.
4. Solid bracket, good windproof and snow resistance.
5. Flexible adaptability to slope, marsh land and other complex terrain (This will be very helpful for you if your project site is on uneven ground)
6. Mature and reliable technology, low failure rate, high tracking accuracy.
7. Simple maintenance, less vulnerable spares.
8. Annual average power generation capacity can be improved 30%-50%.
 
Flat single axis solar tracker: track the sun at east-west direction.
Advantages:
1. Less power consumption <5kW.h/set/year
2. Easy assembly without using machinery 
3. Lowest cost in all same kind single axis solar tracker 
4. Promoting power generation about 15%-25%