Review on 🚢 Deyooxi 12v Outlet Socket: 12 Volt USB Outlet Panel with Quick Charge 3.0, LED Voltage Display, and Toggle Switch - Ideal for Marine Boat, Truck, RV by Noe Miceli

I bought 2 of these to use in a standalone power supply I created with a group 27 deep cycle battery after the great Texas ice storm inspired an affordable 12v backup power supply. Long story. Anyway, I installed them, connected them side by side and with my battery charged to 12.6 volts the voltmeters read 12.7 and 12.8 volts respectively. I've checked the 12.6v battery readings with two different multimeters and they are certainly correct, meaning those voltmeters are off. I didn't plan on trusting them to begin with, but this apparent issue was annoying. To be honest, I wish the USB charger didn't even have those voltmeters, but oh well. That aside and cheap built in glass fuse holders which I quickly replaced with some high quality marine grade ATO fuse holders and shrink crimps to make everything work. and we're ready to go. So it can be used for RVs, vans or stand alone power packs, but beware of power ratings!