You have like a 1m² solar hat that collects 200 watts so you can fire one rifle equivalent shot every 20 seconds, at 50% efficiency.
Your tanks covered in solar panels generate about 6000W of solar energy, vs the 1,120,000W of the Abrahams, so you can drive it for 7.7 minutes per day.
The solar impulse 2 can carry pilot, so about 80kg at a range of ~7000km. The smallest nuclear bomb is the Davy Crockett at about 23kg, so you could carry 3 or 4 of those around 7000km. Really you could build a gigantic solar glider to carry nuclear weapons.
What else? Maybe land mines that need to charge up their explosive power with solar.