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Old 07-27-2010, 05:44 PM   #1
Join Date: Apr 2010
Location: AZUSA
Posts: 49
Battery sensor

I have a question: When i am connected to shore power OR using my generator, should the Battery power indicator read full? I know it's pretty accurate when dry camping, but I'm wondering about shore power/Generator reading.

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Old 07-27-2010, 06:46 PM   #2
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Join Date: Aug 2008
Location: Enumclaw, WA
Posts: 2,617
Yes it will read "full" as the voltage being put in while charging is higher than that for a fully charged battery. Be warned though that the factory battery monitors read very incorrectly and are not an accurate way to tell you battery "health" while dry camping. You can see how this works by turning on a bunch of lights and watching how it will drop from full to 2/3 or less, that is because it only senses voltage not amperage. Now turn off all the lights, magically your batteries are full again! I don't trust the battery monitors on RVs.

"I can fix it, and if I can't fix it, I can fix it so no one can fix it!"
Ed & Wendy
2009 Georgetown 378TS | 1998 Jeep Wrangler | 1998 Skeeter ZX202C
Nights camped in 2009: 53 | Nights camped in 2010: 55
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Old 07-27-2010, 07:02 PM   #3
Join Date: Apr 2010
Location: AZUSA
Posts: 49
Thanks nwjeeper: yes, I've learned that lesson about the monitor throughout the years. Black,Gray,Fresh water and battery, it's a crap shoot trying to figure out what you have..
thanks again
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Old 07-28-2010, 07:08 AM   #4
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Join Date: Oct 2009
Location: South Eastern PA
Posts: 21,370
Cool thing about the TM-2025RV

You can see what the voltage is for each light.

It seems the top light has nothing to do with the battery and more to do with the converter. Any voltage over 13.2 volts will turn on that light.

When fully charged, the battery will hold that voltage until something starts to draw amps out. Once the voltage drops below 13 volts (or so), the top light will go out.

Just like the other "indicators" on that goofy panel, 2/3 light does not mean 2/3 battery. Its more like 98% battery capacity remaining.

It takes a LONG time, (unless your inverter is making coffee - don't ask me how I know), to drop from 2/3 to 1/3. This has not happened since installing the TM-2025 so I don't know what the actual voltage is at that point. I suspect with resistor tolerance being the cheapest they could buy in that goofy panel, that it would vary A LOT anyway.

I will put that on my "to do" list next time I dry camp.

Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
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