Online only On sale! New Solar Panels Astronergy 620W N-Type Topcon Solar Panel ASTRON620 €128.26 Astronergy 620W N-Type Topcon Solar Panel. Sold by the pallet. Astronergy's N-Type Topcon technology monocrystalline photovoltaic module with a maximum efficiency of 22.9%. This solar panel has a positive power tolerance of 0/3% which ensures energy production throughout its lifetime. Its n-type topcon (Passive Oxide Tunnel Contact) cell technology... Add to cart