Hashrate fee of 30 series products is more expensive than the other two series (40 series and 50 series). However, its electricity fee is the cheapest among three series owning to low power consumption.
1. High net output:Because of the cheapest electricity fee, the net output (mined BTC amount) of 30 series miners will be more than that of other models in the market. (daily net output = daily mining output - daily electricity fee)
2. Strongest ability to cope with mining difficulty：When mining difficulty rises sharply, although mined BTC amount decreases, the net output is still more than that of other series owning to its lowest electricity fee.
3. Strongest ability to cope with bitcoin price changes：Thanks to lower electricity fee of 30 series miners, when bitcoin price declines sharply, its daily output of miners can still cover electricity cost in comparision with other series. So its miner shutdown price is the lowest and output is positive.