Just throwing this out there, as a low-budget option. I have a small 28' sailboat on Lake Ontario
that I (pre-2020 at least so far) try to get up to every weekend or other. Nothing too elaborate, with just a small solar
panel feeding some GC2 batteries
. Leading up to this season, I saw a Schulink wireless battery monitor
on clearance at a local Wal-Mart. I figured for the price
, it was worth a shot.
It's not the most sophisticated, but it simply hooks to your bank, and you can hook it to an available Wi-Fi network to allow you to remotely access your battery
level. So I can sit here at home, and pull the app up and see my current
battery voltage, as long as the boat
is at the marina and able to connect to it's Wi-Fi network. Sure this wouldn't work
for boats that aren't able to pick up a signal, but since mine remains at the dock
when I'm away, it's at least a rough gauge.
Here's a link (current as of now at least) to the same from Amazon: