Comments continuing discussion may be removed. A 100 W solar panel charging a nominally 12 V battery will deliver roughly 8.5 A, at most. At the end of the charging, this charging current will drop to about 7.5 A, at most. The solar panel will only deliver these currents under ideal circumstances under full sun.
You need around 600-900 watts of solar panels to charge most of the 24V lithium (LiFePO4) batteries from 100% depth of discharge in 6 peak sun hours with an MPPT charge controller. Full article: What Size Solar Panel To Charge 24v Battery? What Size Solar Panel To Charge 48V Battery?
At the end of the charging, this charging current will drop to about 7.5 A, at most. The solar panel will only deliver these currents under ideal circumstances under full sun. If the battery is lead-acid, a good (but conservative) value for the charging current you want is 0.3 × capacity = 0.3 × 18 = 5.4 A.
You need around 380 watts of solar panels to charge a 12V 130ah Lithium (LiFePO4) battery from 100% depth in 5 peak sun hours with an MPPT charge controller. What Size Solar Panel To Charge 140Ah Battery?
The duration to charge a 12V battery with 300W solar panels depends on the battery capacity and the solar panel current. For instance, at 6 peak hours and 25% system losses (efficiency is 75%), a single 300W solar panel can fully charge a 12V 50Ah battery in roughly 10 hours and 40 minutes. Let’s understand it in detail,
You need around 1600-2000 watts of solar panels to charge most of the 48V lithium batteries from 100% depth of discharge in 6 peak sun hours with an MPPT charge controller. What Size Solar Panel To Charge 120Ah Battery?