Mar-30-2014 08:15 PM
Oct-19-2023 11:19 AM
SJ-Chris wrote:
To add an extra battery, I converted (on Majestic 28a RVs) one of the small driver side compartments into a battery compartment. One battery fits with a little room to spare. I drilled some holes in the side of the compartment for ventilation. I also added some straps underneath and to the frame to give it additional support. With this, I was able to add a 2nd battery to my Majestics. No problems for several years so far.
I also have a 23' Class C RV. It came with 2 batteries in the entry step that I replace with GC 6v batteries. I notice that on this 23' RV I also have a small compartment on the driver's side that I have never used, but in theory it could be used for an extra battery. Maybe your 23' Majestic has a similar storage compartment you could convert.
Good luck!
Chris
Oct-19-2023 10:12 AM
Oct-15-2023 09:59 AM
Oct-15-2023 09:27 AM
jwcolby54 wrote:pianotuna wrote:
Hi,
I think LI are wonderful. They are, unfortunately, not a good fit for me.
When the RV is in storage it gets down to -40, so no you can't help.
I have to laugh. Folks winterize their water systems all the time but can't winterize their batteries? It is called a battery disconnect switch. LiFePO4 batteries have very low self discharge. Charge it and then turn the disconnect switch. Done.
And no, I can't help you.
Oct-15-2023 09:24 AM
Oct-15-2023 07:28 AM
Oct-15-2023 07:01 AM
Oct-14-2023 05:39 PM
pianotuna wrote:
Hi,
I think LI are wonderful. They are, unfortunately, not a good fit for me.
When the RV is in storage it gets down to -40, so no you can't help.
Oct-01-2023 05:01 PM
Oct-01-2023 08:59 AM
pianotuna wrote:
jwcolby54,
Lead acid brand new need to have several discharge recharge cycles to reach their full capacity. This was not done prior to the testing.
https://batteryuniversity.com/article/bu-804-how-to-prolong-lead-acid-batteries
Further lead acid do best when discharge is limited to about 1/4 C.
I love li batteries but can't use them due to cold weather. I boondock at -34 F. My first battery bank was 875 amp-hours.
Oct-01-2023 08:41 AM
Sep-30-2023 12:07 PM
pianotuna wrote:jwcolby54 wrote:
I found a very good youtube video on lithium vs lead acid. It is by an engineer who did extensive side by side testing in the lab where he could get consistent results for each battery type he tested. It is somewhat long but very thorough.
https://youtu.be/iy3hga_P5YY?si=tr2yG_na_vB5rHmQ
It was done at BattleBorn but the results are the same for other manufacturers.
Thanks for finding and posting this.
Unfortunately they did not cycle the lead acid batteries BEFORE testing.
Lead acid / agm are rated at 25 amps discharge, so testing at 40 amps is not a level playing field.
The low voltage cut out is interesting. I wonder if going to 10.5 UNDER load is the same as discharging capacity to 10.5 volts?
Last winter because of snow cover my house bank went to 8 volts. It has recovered nicely.
I do use my rv at -34 f so Li unfortunately won't be in my future.
Sep-30-2023 10:25 AM
Sep-17-2023 09:25 AM
jwcolby54 wrote:
I found a very good youtube video on lithium vs lead acid. It is by an engineer who did extensive side by side testing in the lab where he could get consistent results for each battery type he tested. It is somewhat long but very thorough.
https://youtu.be/iy3hga_P5YY?si=tr2yG_na_vB5rHmQ
It was done at BattleBorn but the results are the same for other manufacturers.