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Old 10-08-2016, 11:14 AM   #11
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I haven't installed my battery selector switch yet Mustang. Thanks.
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Old 10-08-2016, 11:23 AM   #12
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Keep us informed with some more pictures as your project progresses.

If you would like to look at my actual battery test results (using a Wind Turbine dump load resistor (15Amp load)) on my original Interstate 84Ah batteries (4+ years old) you may be surprised at what the CURRENT actual Ah output of the (OLD) batteries are.

Click on Battery Test and scroll down to the "THE RESULTS ARE IN (Battery Test) " in the RVing with SOLAR Social Group
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Old 11-07-2016, 01:31 PM   #13
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I have received my Genius battery charger and my battery selector switch and should be able to get them all installed this weekend.
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Old 11-07-2016, 01:44 PM   #14
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I have received my Genius battery charger and my battery selector switch and should be able to get them all installed this weekend.
Keep us updated and project pictures would be great

Don
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2013 Jayco Eagle 284BHS
250Watt Grape Solar Panel, MorningStar MPPT 60 Charge Controller
1500 Watt Ramsond PSI, 2 Trojan T145 Batteries (260Ah)
2 - AirSight Wireless IP Cameras (used as rear view cameras)
EnGenius WI-FI extender, D-Link wireless (n) modem
MagicJack Internet Phone
2012 Ford F150XLT, EcoBoost w/3.73
157" Wheel base, HD Towing Package

Our Solar Album http://www.jaycoowners.com/album.php?albumid=329
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Old 11-08-2016, 07:38 AM   #15
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Mustang:I don't profess to be a battery expert but I have done some reading over the years to get a better understanding. From an electrical point of view I agree with the report you have provided. In addition to the issues brought up in the report I would think one should also consider circulating currents draining the batteries prematurely due to the different internal impedances of the non-identical batteries. All the issues brought up here may be theoretical (requiring development of Thevenin and Norton equivalent circuits and impedance diagrams we engineers learned way way back in college days) and insignificant but if I were trying to build the backup capacity Vicr is after I would use identical batteries or at least use a series connected configuration.
Vicr: Keep us posted on how this works out. I am curious to see.
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Old 11-08-2016, 08:04 AM   #16
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I learn something new each time I come to this forum.
I had always learned that I shouldn't mix different battery brands, sizes, or Amp hours.
Today I learned that none of that is true and also that it is fine to mix wet cell and AGM batteries together.
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Old 11-08-2016, 08:12 AM   #17
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Quote:
Originally Posted by KYCAMPER View Post
Mustang:I don't profess to be a battery expert but I have done some reading over the years to get a better understanding. From an electrical point of view I agree with the report you have provided. In addition to the issues brought up in the report I would think one should also consider circulating currents draining the batteries prematurely due to the different internal impedances of the non-identical batteries. All the issues brought up here may be theoretical (requiring development of Thevenin and Norton equivalent circuits and impedance diagrams we engineers learned way way back in college days) and insignificant but if I were trying to build the backup capacity Vicr is after I would use identical batteries or at least use a series connected configuration.
Vicr: Keep us posted on how this works out. I am curious to see.
For reference on this forum, getting deep down into the electrical reasoning behind a lot of things is way past the average RVer, even past me. You or I may understand Kirchhoff's Law, but I do not see this as a place of getting into the science behind it... I leave that up to the professionals, most everyone just wants to know the 30,000 foot view as I do in 99% of my reading. If something catches my eye, I may put it on my list to research. The easiest way to get myself or a group to understand something is through examples.
Don
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2013 Jayco Eagle 284BHS
250Watt Grape Solar Panel, MorningStar MPPT 60 Charge Controller
1500 Watt Ramsond PSI, 2 Trojan T145 Batteries (260Ah)
2 - AirSight Wireless IP Cameras (used as rear view cameras)
EnGenius WI-FI extender, D-Link wireless (n) modem
MagicJack Internet Phone
2012 Ford F150XLT, EcoBoost w/3.73
157" Wheel base, HD Towing Package

Our Solar Album http://www.jaycoowners.com/album.php?albumid=329
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Old 11-08-2016, 10:28 AM   #18
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Let me clarify several things. Both the Full Rivers and Interstates are brand new. I had them connected in parallel for one dry camping weekend to see how much the voltage would drop over 4 days of regular use. I then disconnected the Full Fivers from the Interstates. I have not used the Full Rivers again. I have the Interstates permanently connected to a Battery Tender for charging and maintenance. I have a NOCO Genius G-26000 battery charger with a 26 amp output to charge (and maintain) the Full Rivers which is what the manufacturer recommends. I have a battery selector switch I bought from Blue Sea Systems which will let me use either battery bank, both in parallel and off. I am going to install the battery selector switch in a NEMA 3R hinged door enclosure so that it is not exposed to the elements and I will mount it to the left of the Interstate battery tray. For most normal camping we will only have the interstates connected and can use the Full Rivers in the rare event we want to use the inverter or dry camp for an extended time.
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Old 11-08-2016, 11:30 AM   #19
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Vicr: Sounds like a plan! I was curious about this thread because I wanted to be able to install an extra battery in my camper. I also have a truck camper with one battery so I figured I could just move it over when I wanted 2 batteries but they were different brands and age. Theory and real world don't always agree so I was hoping someone would chime in that had put 2 dissimilar batteries in parallel and say whether it worked ok or not for them.
Turns out one battery died so I bought one identical to the good one which was less than a year old - problem solved.

Sorry about the electrical details. DW jumps on me from time to time about that too. She says I try to make every conversation a learning experience. Maybe I missed my calling and should have been a teacher?
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Old 11-08-2016, 12:32 PM   #20
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Quote:
Originally Posted by KYCAMPER View Post
Vicr: Theory and real world don't always agree so I was hoping someone would chime in that had put 2 dissimilar batteries in parallel and say whether it worked ok or not for them.

Sorry about the electrical details. DW jumps on me from time to time about that too. She says I try to make every conversation a learning experience. Maybe I missed my calling and should have been a teacher?
KYCAMPER,
No problem with the electrical details... the members will tell you I am FULL of them.

Looking at 2 big, heavy, different AGE/Ah/Mfr batteries it is kind of hard for the average person (me included) to see any real differences other than cosmetic.

The easiest way I can think of describing the issues in an easy explanation is take a flashlight that holds 4 "D" batteries (if they still make them anymore) and replace one of the "D" batteries with a "AA" battery, you can pretty much envision the end result. Your system is only as strong as your weakest link. Now some of the members may have a visual to remember, although it is a little on the drastic side.

Oh, as for being a teacher of electronics... I taught a course in the "Economics of Telecommunication", bring a lot of NO-DOZE to class.. longest 4 days of my life.

Have a GREAT DAY!!
Don
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2013 Jayco Eagle 284BHS
250Watt Grape Solar Panel, MorningStar MPPT 60 Charge Controller
1500 Watt Ramsond PSI, 2 Trojan T145 Batteries (260Ah)
2 - AirSight Wireless IP Cameras (used as rear view cameras)
EnGenius WI-FI extender, D-Link wireless (n) modem
MagicJack Internet Phone
2012 Ford F150XLT, EcoBoost w/3.73
157" Wheel base, HD Towing Package

Our Solar Album http://www.jaycoowners.com/album.php?albumid=329
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