My friend Dean and I worked Ham Radio Field Day (WA4USN) on the USS Yorktown (CV10). Due to various issues, all 3 generators failed, so Dean and I hooked up his big deep cycle battery and a 400 watt inverter, and kept the radios going for the 20 hours or so left of field day. Next year we hope to bring solar panels, and not use generators at all.
During field day, one of the guys made a contact. When we logged his call sign, a message popped up saying “I am the creator of this software”. That was awesome!