I was kidding about the battery fire, but some people worry on this forum about the most minute of things...
Agree, you don't want to just imp by with ever decreasing battery charge. If you have batteries, get solar!
It cost a few hundred up front, but power is free after that, and long-term much cheaper than a generator, gas and the hassles it brings.
You said 30 watt TV. Amps is the critical number, not watts. If you have solar and start the evening off with charged batteries, then TV will not be any problem at all.
I have two GC batts and run a big electric Danfoss compressor fridge/freezer and still have available power, and the fridge should be the biggest power consumption I ever use, though an inverter running something big will be a drain also. If you can get DC powered everything this is more efficient than using the inefficient inverter to turn DC into AC, and everything except lights and heaters will turn that AC back into DC anyway (your TV does).
You laptop will be the only thing that prob does not have a DC way to charge...
Also, with solar, use power early in the day so there is time to recharge before dark, if possible.