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Old 09-07-2016, 03:23 PM   #1
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Battery life while boondocking

My wife and I both enjoy getting out into the mountains of Idaho in our Forester 3051S. We have found that the batteries do not seem to last quite as long as we expected. Our 3051 does have the larger, 12 cu.ft. fridge and most of the time we have very little running (lights/radio, etc.). I can go to bed in the evening with what the idiot lights say is a full battery and wake up with what I believe is barely 2/3's. I say barely 2/3's because as soon as I run the furnace it drops to 1/3 very quickly. Is this normal? I typically have been running the generator for an hour or two during the day to top the batteries off and have a repeat the next morning.

In our earlier travel trailers we could go 4 days with two batteries without needing a generator and in our Forester 2651 we could go 2-3 days with no issues. Does the larger fridge which is usually quite empty have that big an impact?

Any advice or comments would be appreciated.
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Old 09-07-2016, 03:40 PM   #2
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Originally Posted by Gilm2113 View Post
My wife and I both enjoy getting out into the mountains of Idaho in our Forester 3051S. We have found that the batteries do not seem to last quite as long as we expected. Our 3051 does have the larger, 12 cu.ft. fridge and most of the time we have very little running (lights/radio, etc.). I can go to bed in the evening with what the idiot lights say is a full battery and wake up with what I believe is barely 2/3's. I say barely 2/3's because as soon as I run the furnace it drops to 1/3 very quickly. Is this normal? I typically have been running the generator for an hour or two during the day to top the batteries off and have a repeat the next morning.

In our earlier travel trailers we could go 4 days with two batteries without needing a generator and in our Forester 2651 we could go 2-3 days with no issues. Does the larger fridge which is usually quite empty have that big an impact?

Any advice or comments would be appreciated.
If you are not plugged into shore power and the generator is not running, your fridge should be set to "auto" so it will run on propane rather than on your battery power.
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Old 09-07-2016, 03:57 PM   #3
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Jim, I believe we have had it set on Auto but I will check for sure this weekend. From what I recall, it does say LP when we are out and about. Thanks for the advice.
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Old 09-07-2016, 04:18 PM   #4
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Assuming your fridge worked, then you were on propane. I say that because, the heating required in an absorption fridge comes from an element that is 120v, while the fridge electronics are 12v. while not plugged into shore power. As for your expierenced fast battery discharge, you need to first establish what cond. your batteries are in, before you try and determine why they seem to not last as long as you assumed they should.
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Old 09-07-2016, 04:38 PM   #5
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For boondocking and managing battery power you really really need a good monitor. The silly LED panel that comes standard on most RVs is worthless here.

Lots of folks swear by the Trimetric monitor. But you can get the critical functions for a lot less using the Bayite monitor. Either of these will give you a real current draw number which you can use to measure what different electrical loads you run. If you are running too much then a low battery is to be expected. If you are not then the battery may be weak. But without a monitor you are just guessing.

Note that the fan in a furnace is 12v and a fairly big draw. The monitor will tell you how much draw.
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Old 09-07-2016, 05:13 PM   #6
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If you are boondocking I really recommend a good battery monitor. While the BayLite will give you a good instantaneous voltage and current reading, it lacks the state of charge capability of the Trimetric or Vectron. These two units continue to add the instantaneous current supplied and give you a real time indication of the "state of charge" of your batteries, in the same way a bank teller keeps track of your deposits and withdrawals. SOC can really only be measured by continuous integration of current supplied and replaced or by using a hydrometer and measuring the specific gravity of the electrolyte in each and every cell of your bank. Voltage is a really bad measure of SOC and only works if the battery has been sitting disconnected for at least 24 hours.

What this means is your LED panel or the Baylite only measure instantaneous voltage and give you no good way to asses the state of charge of your batteries when they are being charged or discharged...which is pretty much all of the time.

Personally I recommend the Trimetric and would never be without one, especially with a big battery bank, solar, inverters, etc.
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Old 09-07-2016, 05:54 PM   #7
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Still Kickin -- I had the batteries tested at Camping World the last time it was in the shop for another issue and they told me that the condition of the batteries was fine that they were still like new. I don't have a lot of faith in Camping World's 'expertise' but that is stated on the work order.
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Old 09-07-2016, 05:58 PM   #8
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stevejahr, Scott --

Thank you for the information. I will look into both systems and see what I can do. It is all great information to have while out in the woods with no cell service!

Thank you both again.
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Old 09-07-2016, 07:41 PM   #9
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... While the BayLite will give you a good instantaneous voltage and current reading, it lacks the state of charge capability of the Trimetric or Vectron. ...
True that the Baylite has some limitations...

The Baylite will tell you voltage and current on an instantaneous basis. It will also track power used over time based on the measured current. So it will actually do a good job of telling what you have pulled out of the battery.

The big limitation is the Baylite only measures current in one direction not two directions as does the Trimetric. So as Scott is pointing out it will not tell you what goes back into your battery (unless you wire it up wrong...).

But for the price... I could install two Baylite's and track both the goes outta and the goes inna and still have a lot of beer money left over

Not to mention that the Trimetric is not going to win any aesthetic awards.

Knowing goes inna and goes outta does not quite tell you charge state, unless your battery is 100% efficient at taking a charge but it does get you closer.
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Old 09-07-2016, 08:01 PM   #10
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While the Trimetric isn't a design award winner, it does do a lot of calculating beyond just out vs in and does allow for efficiency in recharge cycles and does a lot of calculating in order to develop it's SOC display. Don't know why people insist on installing it in a big surface mount box, mine is recessed flush into the bulkhead by the entrance steps. It will display a lot of other data but SOC for the uninitiated is where most leave it.

It really comes into its own when used with their companion solar controller do function as the main display for all charging and loads.

If I were going to add anything it would be a relative of the Baylite for my shore power so that I can be sure of the power quality coming in on my 110 volt systems. Would have already bought one but I am concerned with the bad reviews. Don't mind spending $20.00, but I hate to have a hole where it went when it ceases working and there is no replacement
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