i had two 175w renogy flexible panels, neither would pull enough watts to register a charge on my battery so i returned em for a refund. renogy support is decent but they’ll make you measure the voltage and pay for return shipping unless your or their team can prove damange. in my case, they failed to evaluate in a timely manner after returning to their warehouse, so refunded me.
i realized i don’t need solar when i have a 500w charger. everytime i drive, even if its for 15 minutes, i put enough energy in my batteries that i can constantly stay in the 50-80% charge range to maximize battery life.