unveiledsolectveganraspiContactLog inRegister
  • solect
  • vegan
  • raspi
  • Contact

  • Register

Electrics

  • Front Page
  • Latest comments
  • Log in
  1. Electrics
  2. Installation: Caravan
  3. Caravan Batteries
  4. 6 Nov 2014

6 Nov 2014

Battery Sulfation
rollsbattery.com/ . . /charging-flooded-lead-acid-batteries

Thursday 6th Nov 2014
On receipt of the batteries, after checking the containers were intact, I measured the voltage of each and found one at 12.83 the others at 12.88. I then numbered each one and measured the specific gravity of the acid to obtain a better measure of the state of charge.

The hope was that each was fully charged as they are new models and shouldn't have been hanging around the retailers for long and who should have fully charged them before sale. I was clearly already a bit concerned that one was at 12.83.

The expected sg of acid in a fully charged battery would be at least 1.26. On an older battery an sg of over 1.27 may indicate water loss and concentration of acid.

Results of the tests: Battery temp estimated at 11°

sg1 to sg6 are results for specific gravity from negative to positive terminal

IDVoltagesg1sg2sg3sg4sg5sg6
112.86/71.2501.2501.2501.2401.2401.240
212.88/91.2551.2601.2551.2501.2501.250
312.88/91.2501.2501.2401.2551.2501.250
412.82/31.2451.2501.2451.2421.2371.235

Only one cell reached the 1.260 I was hoping for. Battery 4 was not charged as well as the others

Sat 8th
Connected Batt 4 via Victron MPPT controller. At the end of the day the LED indicated float charging i.e. battery at or over 80%. I used this as load battery.

Sun 9th
Once Batt 4 reached the float charge today I disconnected it and connected Bat3 which is now the load battery.

When Batt 3 reaches float charge early one afternoon I will disconnect it and reconnect Bat4. Once I have done this to each a few times I will check the specific gravity and if they are compatible will connect them in parallel.


Pages: 1· 2

Created by roger • Last edit by roger on 27/01/18 06:21 pm

1 comment

Comment from: roger

It now appears that
a) the batteries were not properly charged with n SG of1.25
b) Relying on the Victron indicating float as battery was fully charged when switching from absorption @ 14.5v was misleading.
c) Repeatedly doing as in 2 above over 3 years seriously undermined the batteries capacity by 90%

27/01/18 @ 06:28 pm

Leave a comment

In order to leave a comment Log in now! or Register now!

Comment feed for this post

Content Hierarchy

  • Batteries:~ Rechargable
  • Battery Charging
  • Battery Manufacturers
  • Battery Temperature
  • Cables and Wires
  • Charge Controllers
  • Fusing and Isolating
  • General Topics
  • Generators
  • Installation: Caravan
    • Caravan Batteries
      • 2018
      • 2019
      • 2020
      • 2021
      • 6 Nov 2014
      • Batteries 3 & 1
      • Batteries 4 & 2
      • Munufacturer: Surrette
      • Supplier Barden's
    • Electric Distribution in Caravan
    • Old Caravan Settings
  • Installation: Workshop
  • Inverters
  • Manufacturers
  • Miscellaneous
  • Photovoltaic Panels
  • Suppliers
  • Tools
  • Victron
June 2022
Mon Tue Wed Thu Fri Sat Sun
    1 2 3 4 5
6 7 8 9 10 11 12
13 14 15 16 17 18 19
20 21 22 23 24 25 26
27 28 29 30      
 << <   > >>
RWD CMS

This collection ©2022 by roger • Contact • Help • b2evo

Cookies are required to enable core site functionality.