Maybe having a small solar setup only for this unit 110 watts I saw recently a complete solar setup portable that can be brought everywhere for around $100, limit load is 200w, and with a capacity of 78k mAh this might be a good option for small units it can I think able to run 24hrs straight if the solar can harvest enough power.
For a constant consumption of 200 watts for 12 hours you need at least 4 65 Ah 12 volt car batteries. And in sunny times you need energy to charge the batteries and power the ASIC.
I think that solar energy is effective for daytime mining, but at night time it is better to use another source of electricity.