Jump to content

Continuing saga of our Trojan AGM batteries on our 2019 LEII


Recommended Posts

This is an update containing some new information about the AGM battery issues that we experienced this fall.  Most of the background is in a T105 post by another Oliver owner.  It is my host that an admin may be able to advise on how I might migrate some of the info contained into this new entry, but until then, I will briefly summarize concentrating on the new information.  This fall we were boondocking in Maine and were using the furnace overnight, we had a low battery alarm that surprised us, but we had notice the furnace was cycling a bit more than we had experienced on the previous nights.  Overnight temps weren't approaching freezing and we only set the temp to 58 overnight so we really didn't understand why it was cycling so much.  When we had the alarm, the batteries were below 12V.  We did some testing in our driveway when we returned from camping on several cold nights after insuring the batteries were completely charged by the solar panels.  After some alarming test voltages on both strings of batteries that showed the first 6V battery in each string had very low voltage while just running the furnace, cell booster, and Wi-Fi extender for several hours after the sun had set.  It was suggested that we have the batteries tested and I took the two suspect batteries, one was 3 years old and the other 2 years old, to Batteries-Plus for a load test after both batteries had been charged and sat for a day and both passed.  I reinstalled all the batteries again and monitored for a few weeks during the warm fall weather with the intent of testing under colder temperatures.  I completed my first major overnight test attempt with temperatures in the 20's last night.  I had disconnected the shore power yesterday morning before the solar kicked in and it was a very sunny day so I ran the furnace, cell booster and Wi-Fi extender for the duration.  The solar stopped charging at about 2pm, but everything else continued to use about 11Ah during the latter part of the day into the early evening.  I went to bed in the LEII at about 10pm EST.  We were at 12.7V on both strings when I went to bed and at 12.4V when the furnace and blower were cycling.  When I woke up at 12AM, I discovered the voltage at 11.4V when the furnace blower was on and decided to shut off the furnace and move back to the house.  The voltage was 12.3V when the furnace was shutdown.  When I got up this morning at 6AM well before the sun has risen and started charging the batteries the battery voltage was at 12.7V.  I was flabbergasted.  I suspected that it would be about the same voltage.  My Victron SmartShunt confirmed that we were at 94 percent SOC and had a very modest .37 amp parasitic draw.  I am completely baffled by all this and still suspect that we have a battery issue or a furnace issue due to excessive cycling.  We had a 34Ah draw down at 6am this AM since the last complete charge.

  • Like 2

David Caswell and Paula Saltmarsh


Hull 509 "The Swallow"

Link to comment
Share on other sites

It does sound baffling.  You indicated that you did a load test on the two "suspect batteries".  You may want to also load test the other two batteries as part of your continued troubleshooting.  Good luck.

  • Like 1

Steve and Lornie

LE II Standard  Hull #657  2004 4Runner 4.7 L V8

Oregon

COIDKSMOORTNUTWYmed.jpg

Link to comment
Share on other sites

My wife also is suggesting that I take the other two batteries in and have them load tested.  I also want to check the PD Converter for proper operation.  I intend to disconnect the Zamp Solar Charge Controller from the batteries.  I will then run the furnace to draw down the batteries sufficiently and then turn on the shore power breaker to confirm that the PD Converter will charge the batteries. 

David Caswell and Paula Saltmarsh


Hull 509 "The Swallow"

Link to comment
Share on other sites

I disconnected our Zamp Solar Charger from the batteries this AM after verifying that all the batteries were fully charged.  I did this by removing the red wire that runs from the Zamp to the positive lug on the front battery where both the Trailer wire and Zamp wire are connected.  The Zamp showed the B01 once I had disconnected the correct wire.  The Zamp Charge Controller continues to run because it is powered by the solar panels.  I then set the furnace to on and monitored power usage and battery voltages while it achieved the temperature set point, 58 degrees F.  I also had my WiFiranger on the entire time.  After about 1 hour and 20 minutes, the furnace stopped.  I noted that the batteries were at 12.7V.  I then turned on my shore power breaker.  I checked to see if it was charging and it was not.  Also, the Dometic A/C fan was running.  I looked at the Progressive panel and found a 15amp breaker off.  It didn't appear to be tripped.  I turned it on and immediately had the Progressive Converter charging the batteries.  Now I am wondering why the furnace which was running on Propane suddenly was using the Dometic A/C.  I know the fan is not on Auto, it is on High and the thermostat is definitely on furnace and not heat strip. 

David Caswell and Paula Saltmarsh


Hull 509 "The Swallow"

Link to comment
Share on other sites

  • 2 weeks later...

So after doing more research while trying to understand the condition of our AGM batteries I decided to follow the advice that was posted on some sites.  I decided to put a load of approximately 1.5 amps on my batteries after insuring the 4 AGM batteries were completely charged.  I picked last night to start the test knowing that we would be getting rain for the entire day today and no solar gain.  So far we are at a 36Ah draw down heading into the overnight.  I will monitor before calling it a night and then early tomorrow morning if the batteries are still viable, I will record the overnight Ah draw and then start the furnace to see the impact of 4.5Ah draw while achieving the target temperature in the Oliver.  More to come in AM.

David Caswell and Paula Saltmarsh


Hull 509 "The Swallow"

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

×
×
  • Create New...