Van battery question

[sternwake]

could you use that little panel to equalize the cells?

 Maybe, maybe not.
The amount of current required to bring any specific lead acid  battery to 15.5 to 16.2v, varies so widely depending on the battery. Its Size, its age, temperature and health all are such huge factors,  that if anyone  tried to say for sure it will, or definitely not, I would mock  and berate them  incessantly, until they cried.

A EQ procedure can be done several different ways, but in general, to bring an otherwise 'fully' charged 100AH battery in need of an EQ charge 100Ah battery to 16.2v, one needs 5 amps.  That is about the output of a 100 watt solar panel facing the sun 2 hours before or after solar noon.

So it is unlikely a 10 watt panel will be able to eq a good sized battery in need of an EQ, but as the Mainsail video shows, some  healthy low resistance batteries require very little current when fully charged, to be brought upto damaging overcharging voltages.

EQing a hard working deep cycling  flooded battery can greatly extend its useful lifespan,  but EQing just for fun when it does not need it will also reduce it.  'Eq'ing is usually required when the battery is not being brought back to full charge from back to back deep cycles.

The Hydrometer is the battery polygraph.  There is NO reason to guess when one can dip a hydrometer.

Dont try EQ ing a flooded battery without one, or declaring a battery needs an EQ without having first used one.