new solar panel working?

Mate really roughly,
A 100watt panel will deliver just over 8amps if all the ducks are in a row.
A battery is at 50% state of charge, assume it is 100amp hour battery so half charged is 50 amp hours.
You are looking to put 50 amp hours into the battery to get 1005 SoC.
So 50 divide by 8 = 6.25 which is hours
That does not take into account and inefficiencies, poor performance from the panel, losses across conections or the regulator.
Might give you and idea for a start ing point.
Cheers

jonno, what reading did your volt meter give you that indicated 50% rate of charge?
Kevin

G'day Johno59

You have a solar panel on a c'van and unless it follows the sun you can only get an average of about 1/2 the panels output. It might peak sometimes but will rarely if ever give the 100watt output.
I work on a factor of half for the expected output.
So working on the above calculations, double it.
Someone asked about the regulator and if you also had one of these. It is essential to include one to save your battery, and an MPPT regulator will maximize charge to the battery.

When charging the system will get to 14v and above.

Ross M