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AngliaUSA

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Posts: 2
Reply with quote  #1 
I need to purchase replacement batteries for my 960W 24v Solar Back Up power system.
I was running 16 x Trojan T105 batteries for the past 8 years but the batteries now need replacing.
The batteries never got used or cycled as the whole system is only intend for back up power in the event of an natural disaster / earthquake or grid shut down etc.
I maintained the old batteries for the past 8 years, trickle charged them, equalized them when needed and filled them with distilled water when needed. 
They still look like new .. but the batteries aren’t taking or maintaining a charge anymore. So it’s time to replace them.
 
I’ve been considering either new T105’s or possibly the Trojan L16 or the Rolls S-550 as well.
What batteries would you recommend I purchase as replacements ? Would AGM batteries be a better choice for this type of solar back up system ?
I don’t mind spending little more if the batteries last longer.
Many thanks in advance. 

Rick H Parker

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Reply with quote  #2 
Absorbed Glass Mat batteries are designed for float applications and are the best battery type for standby applications, which is what you have ... your batteries standby waiting for hell to break lose [wink] .
Flooded Lead Acid should be cycled periodically, something that does not happen in your case unless you make it happen or hell breaks lose.

If long life and lower maintenance is important and your willing to trade off performance to get it, Nickel-Iron has the longest life and lowest maintenance.

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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
GOM

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Posts: 63
Reply with quote  #3 
Before you scrap out your present batteries, I suggest you buy, and they are reasonable in price, a battery charger which includes a 'battery desulfator.'  I have one I bought recently, cost about $45 at an Autozone store.  This thing is entirely automatic, you only have to put the red clip lead on positive and the black on negative or chassis ground, plug the charger in, and switch it on.  If the battery is any good at all, it will be charged and then the charger switches to 'desulfation' mode when (I'm guessing) a small AC voltage at a higher than line frequency is fed to the battery for several hours. This is supposed to clean up the battery's internal plates which restores the battery to, not new, but 'younger' days.
 
I have a Ford 24,000 lb cargo truck which has a 460 cubic inch gas engine and a 3/4 ton hydraulic tailgate.  The truck is rarely used (like your backup setup) and has two large 12 volt batteries installed, one for the engine and the other for the lift gate. Both have been in service for years and were really getting tired.  Okay, I tried my new whiz-bang charger, a whole day for each battery.  Wow!  It works.  My truck's starter hasn't been this peppy in a long time and the tail gate is back to its old speedy lift and lower for lots of cycles.  The charger I bought is a 'Duralast.' All solid state and quite small and light. The box says 'automatic 6 or 12 volt selection, 15 amp charge, 3 amp maintainer, for Standard, AGM, and Gel batteries.'  So far, I'm very pleased with its performance although it does take its own sweet time with the 'desulfator cycle.  The manual says "Desulfation will take 8 to 10 hours.  If desulfation fails, charging will abort and the CHARGING yellow/orange LED on the panel will flash.  It might be worth your while to try something like this.      
AngliaUSA

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Posts: 2
Reply with quote  #4 
Sadly these batteries went into service in 1999
and lead acid batteries like the T105's aren't or weren't engineered to last more than 8 to 10 years max. And that's with them being babied ...

Fast forward 18 years to today and no amount of desulfation will bring these back to life .. LOL

Scrap value is all I'll get for them as cores for my new purchases.

From my research to date the AGM's are indeed better suited .. but will likely have a shorter life than lead acid ...

If I can stretch my budget I think 12 x 2volt Lead Acid batteries might last the longest ..... I wish Nickel Iron batteries weren't so incredibly expensive ... yikes a 1000 ah 24volt bank would cost me $19k

The search continues .... here is my electronics ....


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gbwillson

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Reply with quote  #5 
Ah yes...Remember the days when you could drop an aspirin tablet in each battery "cell" to bring the battery back from the dead? Of course that was back when you could actually work on an engine with a few tools and a Chilton's manual. Those days are LOOOOONG gone![frown]

Greg in MN
Rick H Parker

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Reply with quote  #6 
Ah yes...Remember the days when you could drop an aspirin tablet in each battery "cell" to bring the battery back from the dead?

A battery can be brought back from the dead by playing it a Mozart concerto. [wink]

This appears to work when In fact the battery was not dead, it just appeared to be dead due to uneven depletion. The real reason why the aspirin appeared to work was time, not the aspirin.  The battery appeared to be dead because, the energy around the terminals and the plates were depleted.  Given time, the remaining charge becomes more evenly distributed and the battery appears to have risen from the dead.

You ever had a car that would not crank over, let it sit for an hour and it cranked and fired up? If so, now you know why.



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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
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