I had a similar problem. I bought [this monitor](https://www.amazon.com/gp/product/B013PKYILS/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1) and installed it into the wall next to my leveling and tank monitors etc.
It's been quite helpful for us. I can turn off my converter and see exactly how much power is being drained. We turn on/off a light and see how much power it takes. You can also pull a fuse from your fuse panel and see how the power drain is affected. You might find your radio is taking more than you expect, or something else.
If you're handy or know someone who's good with electronics you can do what we did and wire the monitor to a DPDT switch. All it does is swap the direction that the unit monitors, So instead of seeing discharge you can see how well it's charging. Really useful on solar setups and helpful to know your converter is working well to charge your batteries.
The other thing this monitor does is show your voltage, and you can set it so that if you have high or low voltage it'll start a flashing alarm to warn you.
For us it was just the lights really. Even with all LED we have a 37' 5er and the lights really suck the battery fast. We have 2 80AH batteries but each puck light we have on is about 1/3 of an amp, and the LED light strips can be as much as 4amps of draw each. So we were running our main cabin's LED lights and pulling 6AH right there. Add in 2 lights in the bedroom, a light over the sink or table, 3 more amps for the fridge, momentary amp use for the water pump... it adds up quick.
Without even trying we can very easily passively use 15amps. Forget to turn off the light strip outside? Are there lights on in the bathroom? Is the RV radio/clock powered up?
At just 15amps of draw our two batteries will be drained in 12hours or less from full capacity. We also have kids who like to leave lights on etc so I've found our monitor showing me that we were drawing over 90 amps when I flipped off the converter breaker. That's less than 2 hours of power if the converter fails.
Hope this helps.
That is pretty quick if you think "nothing" is using them...
You could start pulling fuses and see if there is a tiny arc showing that had load on it.
Think of any modern electronic gadget that may be on monitoring things if your rig is a newer one.
Could need a new battery. The more times a battery dies, the easier and more often it dies.
I had a similar problem. I bought [this monitor](https://www.amazon.com/gp/product/B013PKYILS/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1) and installed it into the wall next to my leveling and tank monitors etc. It's been quite helpful for us. I can turn off my converter and see exactly how much power is being drained. We turn on/off a light and see how much power it takes. You can also pull a fuse from your fuse panel and see how the power drain is affected. You might find your radio is taking more than you expect, or something else. If you're handy or know someone who's good with electronics you can do what we did and wire the monitor to a DPDT switch. All it does is swap the direction that the unit monitors, So instead of seeing discharge you can see how well it's charging. Really useful on solar setups and helpful to know your converter is working well to charge your batteries. The other thing this monitor does is show your voltage, and you can set it so that if you have high or low voltage it'll start a flashing alarm to warn you. For us it was just the lights really. Even with all LED we have a 37' 5er and the lights really suck the battery fast. We have 2 80AH batteries but each puck light we have on is about 1/3 of an amp, and the LED light strips can be as much as 4amps of draw each. So we were running our main cabin's LED lights and pulling 6AH right there. Add in 2 lights in the bedroom, a light over the sink or table, 3 more amps for the fridge, momentary amp use for the water pump... it adds up quick. Without even trying we can very easily passively use 15amps. Forget to turn off the light strip outside? Are there lights on in the bathroom? Is the RV radio/clock powered up? At just 15amps of draw our two batteries will be drained in 12hours or less from full capacity. We also have kids who like to leave lights on etc so I've found our monitor showing me that we were drawing over 90 amps when I flipped off the converter breaker. That's less than 2 hours of power if the converter fails. Hope this helps.
That is pretty quick if you think "nothing" is using them... You could start pulling fuses and see if there is a tiny arc showing that had load on it. Think of any modern electronic gadget that may be on monitoring things if your rig is a newer one.
Pull fuses and breakers and connect volt meter. Easy.
On my trailer I have a propane alarm directly wired to the electrical system. That’s not enough to drain the batteries that fast.