A good power station is something everyone should look into also. Mine stays hooked up all the time and will over an outage for about 13 hours for the return to stay on. With powerheads and heaters also it will last about 3-4 hours. Its only a 1000kwh one. They have sales all the time if you watch for a deal on one via amazon
Will cover most outages by itself and provide ample time to hook up a generator if needed