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Old 06-02-2011, 02:45 PM   #1
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Battery Monitor System Ideas

Don't mean to double-post, but this might be useful in the "mods" section.

I saw a few posts regarding battery monitoring and remembered that I installed a system in a sailboat I had a few years ago. Battery monitoring was pretty important to us while staying on the boat for a few days. Dry camping is very similar, so I've decided to use a device from the same manufacturer in the Roo.

These are a bit expensive, but I can tell you from experience they work extremely well. Similar in functionality to the Trimetric.


Microlog products (this is the system I installed in our sailboat)

Microlog products (this is what's going in the Roo)



Dave
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Old 06-02-2011, 07:58 PM   #2
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I installed one of these with a momentary switch.

It works for me.
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Old 06-02-2011, 08:30 PM   #3
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I am very happy with my TM-2025RV for not all that much more for what you get. The ammeter is worth the price of admission alone IMO.

You can watch every charging amp going in and every discharging amp going out in 100 Milli-amp increments. It can monitor 2 batteries or a bank and solar bank. Once you tell it your bank's capacity in Amp Hours it will tell you in percent remaining what the charge is in 1 percent increments.

http://www.solar-electric.com/trtmbamosy.html
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Old 06-02-2011, 09:48 PM   #4
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Yes, I absolutely want to monitor my usage and charging performance. These are great tools to have for non-electric camp sites.
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Old 06-02-2011, 11:11 PM   #5
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Lou............You have all the toys !! Nice set-up !!
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Old 06-02-2011, 11:27 PM   #6
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The shunt is located in the battery compartment.
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Old 06-03-2011, 12:59 AM   #7
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Very nice job Lou!!!
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Old 06-03-2011, 08:55 AM   #8
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Need some new pictures.

I have since added a 150 amp ANL fuse to the Inverter and an on/off switch for the front landing gear.

The two dish tubs I made the battery box out of can hold 2 27 size batteries even though I have 2 24 size ones now.
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Old 06-03-2011, 09:34 AM   #9
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Lou,

Nice setup!

Are you monitoring "net" current? Or are you monitoring charge-only or consumption-only?
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Old 06-03-2011, 10:12 AM   #10
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It is "Net" current.

The shunt is in the return line (negative terminal of the bank). So it measures the current in or out of the bank. If the number is "positive" it is charging at that rate; if "negative" it is discharging at that rate.

When you turn on a light while on battery, the negative number gets more negative. That way you can write down what each item in the trailer actually uses.

Additionally, you can see how each charging source actually charges the battery bank as the batteries charge. For example when the converter (shore power or generator supplied) is charging the bank, and you demand amps to run the slides (say) you can watch the positive charge rate go negative then back to positive as the start up draw exceeds the converters ability to supply amps momentarily.

You can also watch the the amp "step down" as the battery charges and its voltage increases.
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