The lightest generator I found was around 20Lbs, + gas, + oil, noisy, smelly, heavy, hot. Most places around here (campsites) only allow operation of generators at certain times during the day, like 8-10AM & 6-8PM... The solar panels that I found were 7Lbs 120W, 14Lbs 240W, 17Lbs 300W. If you are charging 1 battery a day the 120W would work but for 2 battery's the 240W would be nessesary... The cost/affordability that certainly is a problem with solar...