Earth is approximately 150 million km from the Sun
Sunlight intensity falls off with the square of distance (ignoring any additional small losses from space dust / scattering from gases etc), so twice the distance = a quarter the solar flux. At the Earth it's ~1361 watts per square meter.
Voyager 2 is approximately 133 times further from the Sun than Earth is, which means it receives optimistically 1361 / (133^2) = 0.07694 watts per square meter.
I found a JPL article [1] that says the RTG onboard Voyager produces 40% less power than it did at launch, and the Wikipedia article [2] says it produced 470W at launch, which means it makes ~280W now.
Wikipedia [3] suggests the solar panels available at the time of Voyager's launch in the late 1970s could convert ~10% of incoming solar power to electricity. Modern panels bring that up to 30% but the designers of Voyager did not have access to time travel.
So at present distance Voyager would need approximately 36000 square meters of solar panel to produce the same amount of power.
[1] https://www.jpl.nasa.gov/news/a-new-plan-for-keeping-nasas-o...
[2] https://en.wikipedia.org/wiki/Voyager_2#Power
[3] https://en.wikipedia.org/wiki/Solar_panels_on_spacecraft#His...