The optimal operating temperature for DELTA Max is 68°F to 86°F.
But it can be discharged at any temperature between -4°F to 113°F, and it can be charged at any temperature between 32°F to 113°F. Temperatures above or below the recommended range will affect your power station's ability to charge and discharge normally. So if you want to charge it in winter, make sure it is not below 32°F.
We suggest you store DELTA Max at a temperature between -4°F to 113°F, to avoid damaging it also for safety reasons. Also if you want to store it outside, make sure to keep it away from water, heat, and other metal objects. And follow the storage instruction provided in the manual to prevent any damage or issues.