A professional manufacturer of solar panelsand double-span solar devices for electric vehicles will explain to you: 3 20W12V solar panels are connected in series with 60W36V. Voltage can be determined under good lighting conditions. Reaching 48-60V, which barely meets the charging voltage required for 48V electric vehicles, it is better to use another 20W 12V battery board of the same specification in series, and finally connect in parallel with the Battery and test it to determine whether the battery board can charge the battery.
Related Notes
Most current dual-span solar electric vehicle devices use each dedicated 72V solar electric vehicle panel 130 W due to voltage. The level is related to the weather, so using a single high voltage battery panel can reach therated charging voltage in the morning, afternoon and rainy days for charging electric vehicles. Low voltage panels cannot charge in low light conditions.
Calculation of charging time of 130W battery panel on battery: 48V20AH*60% (battery discharge level) ÷ (130W*80%) (power consumption and charging efficiency) = 5 .5 hours to fully charge.
It is not allowed to connect two 36v solar panels in series to directly charge a 48v electric vehicle. After series connection, it is 72V, so a voltage stabilizing device should be used to stabilize the 72V voltage above 48V and below 55V. It is also important that the power of the solar panel and that of the electric vehicle battery correspond. If the solar panel power is lower than the battery power, the panel may be damaged! The mostMost solar panels have very low power. Indeed, they are often used to power domestic LED lamps. Household LED lights have low power and high brightness, so they do not require large electrical panels. Personal opinions are for reference only