inputs.text: not bad - hooked one single mitsubishi 250watt panel 31v 8amps getting 175watts 110v ac outlet 70 efficiency assume panels not always outputting 250watts efficiency rating might bit higher not bad alli panel hooked power jack 1200w not able get 140watts 110v ac outlet 56 efficientanyway getting panelsupdatewell days getting close 200w 110v ac outlet quite happy little box 10 months no issues fan comes minute two every 30 minutes 200 watt output 250w solar panels hook 500w inverter like way overall guys barely gets warm