Boat Monitoring System

Enjoy peace of mind knowing your boat battery is fully charged and your bilge is working properly. With our low-profile sensors you can easily set up a boat monitoring system customized to you. This is the only product on the market that can detect battery voltage, temperature and bilge performance, all without draining your marine battery or needing access to wifi! Check on your boat remotely anytime with our data portal and receive custom alerts when the sensor detects anything out of the ordinary.


Get Alerted when things aren't right!


$199 + $9.99/month
+ Free Shipping




  • Know before you go boating if your batteries are charged
  • Rest peacefully knowing you have an alerting system if your bilge is not keeping up with the water getting in your hull
  • Monitor multiple areas in your hull by daisy chaining multiple float switches
  • The RMS-BAT2100 sensor consumes very little battery power. It would take over 5 years to drain a single marine battery, if it were never charged.
  • Graph of battery voltage tell how your charger or solar charger is performing
  • Monitor and graph temperature and set alerts if temperature is out of range
  • Get alerted if your battery charger is disconnected
  • No external cellular antenna required. Everything is in the little box!
  • Setup multiple email accounts or texting email addresses in the cloud to get alerts
  • The absolute lowest cost solution on the market, built by engineers who designed advanced systems for companies like Meggitt PLC, Trimble Navigation, FedEx, and Nokia.
  • Designed and Manufactured in Colorado. We do it all right here on the front range in Colorado.
  • We stand by our products. 100% satisfaction guarantee for first 30 days! If it doesn't connect where you need to use it, or you don't like it, just return it (undamaged) for a refund.


View the Product: RMS-BAT2100 Cellular Dual Battery Monitor 


How it works: 



 Different Ways to Connect & Sense

Diagram 1 - Simple Setup - Sense two batteries and one float switch
Warning! Do NOT connect "sensor" input to the float switch used for bilge activation. Use a separate float switch.

Diagram 2 - Monitor two batteries and one door switch

  • Door switch - Use a "Normally Open" Magnetic Reed Switch
    • When door is closed, switch needs to be an open circuit (not connected)
    • Alarm sent with door opens and switch closes

Diagram 3 - Monitor two batteries and one door switch with an Arm / Disarm switch

  • Door switch - Use a "Normally Open" Magnetic Reed Switch
    • When door is closed, switch needs to be open
    • Alarm sent with door opens and switch closes
  • Arm / Disarm Switch  - use a "single pole single throw" toggle switch (SPST)
    • Arm = switch closed
    • Disarm = switch open


Diagram 4 - Two Batteries and Multiple Float Switches
- Just connect the float switches in parallel to add more than one to the system.
Warning! Do NOT connect "sensor" input to the float switch used for bilge activation. Use a separate float switch.

Diagram 5 - Advanced Setup - multiple float switches and door switches in parallel with door switch arming / disarm
Warning! Do NOT connect "sensor" input to the float switch used for bilge activation. Use a separate float switch.


Diagram 6 - Monitoring Bilge Pump Activity

  • Connect one battery input to the battery
  • Connect second battery input between bilge and float switch used to operate bildge


  • How do I know if my sensor will connect to the cell tower where I store my boat?
    • Answer: If a Verizon phone connects at the location, the RMS-BAT2100 should connect. If it doesn't, then return it within 30 days for a refund. We want you to be 100% happy with your purchase.
  • Where can I get float switches?
    • Walmart or Amazon is a great place to look. Although, Amazon has a pretty large variety to select from. Any float switch that works as a switch to turn on a bilge pump will work.
    • You want to mount the high water level float switch (the one you connect to the sensor input), higher than the bilge pumps float switch, so you only get alerts when the bilge is not doing its job.
  • Can I use a water probe, instead of a float switch?
    • Yes you can! The sensor input is designed to handle both types. Oh, and you can even connect them in parallel (daisy chain) and increase the water sensing ability.
  • How can I measure the bilge time-on percentage?
    • Instead of connecting a 2nd battery, you can connect one of the battery ports directly to your bilge pump. This will allow you to set alert notifications in the cloud if the bilge runs longer than it should. We suggest that you don't set notifications right away, and get a feel for how often your bilge is running normally, then set an alert for when a higher value occurs.
    • NOTE: Never connect the sensor input to the bilge pump or the bilge float switch. (We said that earlier, but it's worth repeating!)