will a group 24 and a 50watt panel be enough for 2 week trip

A single group 24 will be around 75-80 AH. If you only let the battery get to approx 50% SOC, that gives you approx. 40 amps of usage in a 24 hour period. A 50 watt panel will only deliver on a good day about 3-amps. You'll need more panels or a generator to maintain the battery SOC above 50%, as it will be under load most of the time.