Delta Pro 3 + extra battery temperature

I just received my new Delta Pro 3 extra battery. I got it all set up and was only running my Internet router and tv during the day and noticed the extra battery temperature at 88°F and the DP3 battery at 84°F. Overnight the indoor temperature of the house was 63°F with only the Internet router in use and battery temperatures were 79°F and 84°F.

I see a lot of people that have awesome set ups and some of them appeared to be in a garage with multiple units all stacked on top of each other I will separate the extra battery from sitting on top of the DP3. I solar charged the DP3 a few days ago, keeping it in the shade and noticed the temp was reaching about 102°F in the shade with 68°F outside temperature.

I was wondering how people combat the high temperatures of summer to keep their units from going over temperature of 113°F ?