It is recommended to use a counterweight of ≤5 kg. When using a 5 kg counterweight, the lever arm should be installed within the range of 20 cm to 30 cm.
For counterweights of other masses, the installation position can be calculated as follows:
Assume the counterweight mass is m kg. The allowable lever arm length L is defined by:
10 N·m ≤ m × g × L ≤ 15 N·m
where g = 9.8 m/s², which can be approximated as 10 m/s².

For example, if a 2 kg counterweight is used, the allowable range of L is from
 10 N·m / (2 × 10 m/s²) = 0.5 m to
 15 N·m / (2 × 10 m/s²) = 0.75 m.

*Note: The recommended operating voltage for the ZWO Harmonic Equatorial Mount is 12V. When the actual input voltage is below 10.8V, the mount will emit a beeping alarm to indicate under-voltage condition. To ensure proper functioning of the equipment, we recommend using the official ZWO power adapter and an appropriately sized power cable.