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Old 12-04-2019, 06:27 PM   #1
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Need cheapo battery monitor w BT

Hey guys,

I found my chassis batteries dead today. I got some unbelievable parasite draws on these. But my 100W solar panel was supposed to take care of that. I am in the process of finding out what went wrong there. Which could be many things. The coach is wintered, all battery sws and disconnect sws are off. And we are not plugged in.

So I have a trimetric that is hooked up to my house batteries. I paid $700 for a RV tech to drill a hole in the ceiling of my battery compartment to install it.

I am not a cheapo, well kinda, but I'm thinking I need to monitor the discharge on the chassis batteries. Voltage is ok but i need to know if my solar is charging or not and what is the draw on the chassis batteries. I don't want this to happen again. Is there a cheapo battery monitor around that could fit this bill and something with bluetooth?

I wish the trimetric could monitor both battery banks but it doesn't.
ps I have 1200W on the roof that keeps the house batteries charged.
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Old 12-04-2019, 06:34 PM   #2
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Maybe something like this ?? Just depends on what you consider cheap

https://www.amazon.com/Spartan-Power...79919459&psc=1

Or 300 amp version

https://www.amazon.com/Multifunction...7N1XKJWE6SSY7W
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Old 12-04-2019, 07:25 PM   #3
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They are perfectly cheap enough compared to $200. But I didn't see any bluetooth capability.

I may be asking too much because there are cheapo BT models but they only display voltage. No current draw or charge.
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Old 12-04-2019, 07:31 PM   #4
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I added a trickle charger that is between the house batterys and chassis battery. Connects where the emergency start solenoid is. Any excess from shore or my solar goes to the chassis battery. Works like a charm.
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Old 12-04-2019, 07:36 PM   #5
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Originally Posted by Kiss4aFrog View Post
Maybe something like this ?? Just depends on what you consider cheap

https://www.amazon.com/Spartan-Power...79919459&psc=1

Or 300 amp version

https://www.amazon.com/Multifunction...7N1XKJWE6SSY7W

Besides not being Bluetooth they only measure current/power in one direction.
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Old 12-05-2019, 10:37 AM   #6
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I use the NASA BM-1 bluetooth battery monitor.

https://www.nasamarine.com/product/bm-1-bluetooth/

Simple to install and set-up. It can be used with either android or IOS. Will also monitor chassis battery (voltage only- requires a wire from the controller to the chassis battery).
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Old 12-05-2019, 10:43 AM   #7
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A Trik-L-Start will solve your problem
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Old 12-05-2019, 11:08 AM   #8
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A Trik-L-Start will solve your problem
That's what I use. Does a great job at keeping chassis battery up.
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Old 12-05-2019, 11:36 AM   #9
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That's what I use. Does a great job at keeping chassis battery up.



True, I have one too but it does it's job only while on shore power or gen.


To the o.p: I'd be more inclined to fix/disconnect the loads that are killing the batteries- don't buy more stuff right now unless you're just compelled to do so. Use either a v.o.m. to look at voltages as you remove each load, or an amp clamp which might be easier.


My coach is stored with no hook up- it can sit sometimes for 2 months and the batteries are fine. I get 5 to 6 years out of a set.
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Old 12-05-2019, 11:55 AM   #10
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I also have 305 watts of solar so the chassis battery is always getting a hit.
Also our RV never sits that long, 4 weeks at the most.
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Old 12-05-2019, 12:44 PM   #11
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I wish the trimetric could monitor both battery banks but it doesn't.
ps I have 1200W on the roof that keeps the house batteries charged.
I'm pretty sure the trimetric has the input for a second battery. I believe it is voltage only (no shunt) but I can't really remember.
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Old 12-05-2019, 12:59 PM   #12
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.... Is there a cheapo battery monitor around that could fit this bill and something with bluetooth?.....
I wonder if you have to be concerned with the wattage of the shunt when installing on the chassis battery?
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Old 12-05-2019, 02:01 PM   #13
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I wonder if you have to be concerned with the wattage of the shunt when installing on the chassis battery?
Yes, you would want shunt that can handle 1000 amps. That's what it could see with 2 950 CCA batteries running thru it.
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Old 12-05-2019, 02:02 PM   #14
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Unless your 100 watt solar is connected directly to the chassis battery, turning off the battery disconnect may be shutting off the solar.
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