Premier SOL-5474 Manual De Instrucciones página 13

13.Battery:Charge for the battery at least each three months.
14. PCBA with solar charge controller: control the solar charge current and output voltage/current.
15.Solar panel:40W for SOL-5474, 60W for SOL-5475.
Attention: Please charge the battery each month if you don't use it. Keep the battery capacity
around 75% is better for the battery life.
6. Product Photo
P-4