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Does Square D make the quad breakers like Seimans does? With 2 tandems tied together and the middle two tied together so you can use them for 240v? The panel says 70A max but with a 3/4” looking conduit I’m thinking there’s likely 12/3 feeding it?
That's likely out going circuits going underground, incoming likely come through the back. That's why we need the cover off to start with.
 

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Licenced Electrician
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When I see 2x 2pole square D breakers I assume they are fed with 240V. It would be a rare occurrence that they are not. How often do you see a panel fed with 120V?

And the fact that there would be no real point to putting breakers in that were the same size as the supply leads me to think the supply might be bigger.
 

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OK, but I didn't think you could run 240 off single pole breakers. AFAIK double pole breakers are (required to be?) tied together, and these are clearly not.
Look, we can guess here all day. We don't even know if that little subpanel was originally intended for outdoor lights. The breakers look newer than the panel itself. Maybe it was originally intended for a hot tub. As it is, it would be strange for someone to run from a main panel and then install another panel for simple yard lighting. If we get the cover off we can definitively answer the question as to whether there is sufficient power there to work with.
 

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as someone else pointed out there’s a photocell on the box and a line leading underground which would lead one to believe it’s feeding some kind of outdoor lights, on 2 - 120v circuits. Why in the world would someone run 220v line just to split it into two 120v lines to run some outdoor lights? If it was a hot tub and required a 220v breaker then yes, but in this case there’s no reason to put a 220v breaker in the main panel just to split it for some outdoor lights. Regardless there not going to be enough power in that box to run a 30-50amp welding machine.
There's no reason for this panel to be there period for some outdoor lights. I prefer to investigate rather than guess for the sake of removing a single screw.
 
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