I bought one of the small 1.8 Watt solar panels from CT when it was on sale for $9.99. From my testing, it did not produce much power. When I hooked it up to an LED (voltage converted) to test it, it gave a medium-high brightness on sunny day. And when using a halogen flood lamp over it, it never gave the 1.8 watt ratting on a multimeter. I don't remember what but it was near 1.8 but not 1.8 watts. IMO it be okay to slow down or maybe stop trickle loss, but I would not worry about it over charging.