Van battery question

[TWIH]

Ok Ill try the direct to battery connection. Should be able to go through the firewall with the tiny probably 14-16 gauge wires. I have read a few places that its ok to put a 10 watt panel (uncontrolled) onto a 100 amp hour battery, so a dash mounted 10 watt panel should be ok given the 40% power factor due to the windshield (don't know what the amp hr rating of the new battery is but likely in the 50’s).