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pianotuna's avatar
pianotuna
Nomad III
Apr 21, 2023

telcom battery bank

Hi all,

This winter I was not home. There was an early heavy snow and the solar panels on the rv were covered all winter.

So far I've had about 19 amps going into them for one hour. After 24 hours, resting voltage was 8.1

I did another 20 minutes and voltage while charging started at 10.1 and ended at 11.3.

I'm hoping that when I have some shore power, I'll be able to rescue the telcom jars.
  • Hi Mex,

    I do have a regular transformer rectifier Battery Charger. I wanted a variac before I got the autoformer.

    If I were to yin yang I'd go for Sio2. The problem is my age.

    The existing jars don't owe me a dime.

    I will ask my cousin to load test them later this month--and will base my decision on the outcome.
  • I've yet to stumble across a conversation that mentions which brand of lithium battery is a standout; survival or cycle wise. That might have to do with the actual weight of each module. It would be hard for me to swallow "a cell is a cell" when it comes to lithium. Unlike western economies I am unable to dig up much information on the subject of China and lithium battery manufacturers. The small experience I have with another type of lithium. Battery is rather sour.

    Replacement batteries like for my ereaders use reclaimed cells. Lifespan is less than half of a new battery. The sales pitch though is outright fraud. Keep in mind this is a different type of lithium battery to begin with.

    Until LTH starts making lithium batteries here in México I am leery of going automotive size lithium. For solar the Tesla wall pack looks entirely legit. I need more factual info.
  • MEXICOWANDERER wrote:


    Until LTH starts making lithium batteries here in México I am leery of going automotive size lithium. For solar the Tesla wall pack looks entirely legit. I need more factual info.


    Canada just won the bidding war for VW to build their new battery plant in Ontario. does Mexico have any Li mines? that's where the plants are going to be built, close to the natural Resorces and the automotive industry.

    the tesla wall is legit, but man is it expensive. I am getting quotes right now to do solar on my house, but I had to pass on the tesla solar wall.
  • If anyone tries to gmail email me remember I've been blocked out since October. Use the message system here.
  • pianotuna wrote:
    Hi all,
    ... I'll be able to rescue the telcom jars.

    Some telecom jars were about 4' tall !
  • Hi all,

    I got a chance to load test the battery bank.

    one set (each 139 amp-hours) was doing 350 amps

    the other pair did 550 amps.

    I think it is safe to say they survived.
  • Good news indeed, is the second pair a higher capacity rating than the first pair, 550 to 350 is a big difference, if all 4 are the same rating and same age, then the first pair is not in the same condition as the second pair, but not a total loss
  • pianotuna wrote:
    Hi all,

    I got a chance to load test the battery bank.

    one set (each 139 amp-hours) was doing 350 amps

    the other pair did 550 amps.

    I think it is safe to say they survived.


    sounds like one didn't do as good eh. What should they pull new?
  • all four strapped together do 1000 amps.

    They have now been in use for 6 years by me.

    My biggest load is the microwave at about 170 amps.

    I did not measure draw when they were "new to me". These are pulls from cell phone towers, so I have no idea what their oem could manage.

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