A 70 watt pump will drain 5.83 amps per hour. That means your battery can theoretically provide just under 31 hours of power, but you typically don't want to drain batteries under 40% even deep cycle batteries. The solar panel can offset the difference of the air pump. Assuming you get roughly 11 hours of good sunlight a day, you can theoretically get a maximum of 60-70 hours out of your battery and solar panel, depending on specific conditions. In reality, I wouldn't count on it for more than a day or in an extreme emergency more than 2 days.Originally Posted by samtheman
The battery and UPS are simple. Use the contacts for the old battery to your new battery. The UPS should manage the battery charging and cycling on/off during outages. To add the solar panel, you will want to wire it in parallel to the battery. You will need a charge controller or at least a diode that will prevent the power from traveling in reverse. If you go this cheaper route, it can cause overcharging. Also, your charge controller for the solar panel should only kick in when the UPS is not charging the battery, which would work out great for you.