Those trickle charges do just that, maybe 160 mA. You won't actually be getting enough to charge an SLA. There are a bunch of small inverters intended to plug in you car lighter, for charging small stuff like cellphones, Ipods, cameras, maybe even laptops (100 watts?), but they are dirt cheap. Might be enough to run a 40 Watt fluorescent. There are camper/RV fixtures that run directly of 12 volts, might be more efficient. Didn't catch you location, so kind of hard to suggest a panel size. I'm in Florida, installed a 12 watt panel about 3 months ago, and it keeps 10 Ah battery charged, and suspect I could double that.