A while back I wrote/adapted a decent little multi-port webserver for the ESP32. It is able to host any site that's largely static, or just HTML and JPGs. The site content lives on the SPIFFs storage, which is limited.
I also happen to own and operate an old website, 1969Pontiac.com, that's been around forever. As you can guess, it's information and resources for 1969 Pontiacs.
I thought it would be cute if I could put that chip in that car and then 1969Pontiac.com would be actually hosted by a 1969Pontiac.
But what would the battery draw be for an ESP32 chip doing WiFi? And how long would that last on a 12V, 100Ah battery?
I figure I'll need a battery charger to maintain it, but would like it to live 3 days without, but am not sure what the power demands under wifi are like (I'm a software guy!)
Check the specs for the ESP32 chip doing WiFi. A battory of 100 Ah is requsted to last for 3 x 24 hours == 72 hours. Maximun current allowed would be 100 / 72 = 1,39 Amps if You can squeese out all those 100 Amp hours…...
Expect an ESP32-based board with 5volt buck converter to draw a whopping 50-60mA from a 12volt car battery.
That's about three months if you fully drain that 100Ah battery (bad idea).
Charge it about every month, and you're ok.
Leo..
Edit: The buck converter could be a cigarette lighter style USB charger,
with USB lead connected to the ESP board.
Thing is I've seen the ESP32 pull a lot (which I can't recall well enough to quantify) of power for Wifi connect. I almost need to measure the load or assume worst case but cannot find a reasonable worst case guess!
The 50-60mA I estimated comes from a powerdraw of about 120mA from the ESP-32 (educated guess).
The buck converter only draws 50-60 mA to deliver that 120mA for the regulator that makes 3.3volt for the ESP.
Leo..
