I'm currently in the middle of making a small emergency power source using an AGM 40 Ah deep cycle battery. It will have a 120 v AC plugin, 2 USB c-charger plugins, a 12 volt cig lighter plugin, power meter, solar panel plugin, and trickle charger, so if current is available, it will be charging. This is enough to run small fans, laptops, power cell phones, lights, and other small devices. Have any of you made similar devices? Any tips?