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Rick H Parker

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Reply with quote  #21 
Who appointed mvas the great decider or did he appoint himself?
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Rick H Parker
Kansas, USA
Electronics Engineering Technologist

stmbtwle

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Reply with quote  #22 
Last time I bought Trojans (the battery kind) they were about $100 each.  You can get the Wal-mart variety for about $80.

One might "expect" 8-10 years ... but not in my experience. I have 6 T-105s on my boat, charged by 600w of PV.  They are normally at 80-100% charge.  I might get 5 years per set.

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Willie, Tampa Bay
Rick H Parker

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Reply with quote  #23 
I might get 5 years per set.

life cycles for FLA are spec'd for stationary applications because, stationary applications produce the best looking numbers. Mobile applications disturb the sediment in the sediment traps more so then stationary applications. When the sediment reaches the bottom of the plates it creates shorts between the plates. A garage is stationary, a boat is not. If you can get 5 years in a mobile application with similar SOCs One would expect better in a stationary application.

Another reason Boat means Break Out Another Thousand. [wink]


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Rick H Parker
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stmbtwle

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Reply with quote  #24 
I can understand that, but this is a houseboat, and the batteries are oriented athwartships which means the cells are fore and aft.  What little rolling the boat does shouldn't affect them much, and it certainly doesn't pound. T-105s were I believe DESIGNED for mobile applications (golf carts).  I can see better life in stationary applications but I think 8 years is a stretch.

But, yeah, Break Out Another Thousand pretty much covers it....  [frown]



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Rick H Parker

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Reply with quote  #25 
I think 8 years is a stretch.

Trojan T-105s are rated for 1000 cycles at 80% DOD. Normal life expectancy is 10-12 years.  The ambient temperature of the cells is a major factor in the lifetime of any battery system. Ideal temperatures are around 75F, at 95F the life expectancy is cut in half. Your Florida heat may very well be the reason your only getting 5 years.

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Rick H Parker
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stmbtwle

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Reply with quote  #26 
Could be.

1000 cycles in daily service is less than three years, though Klecroy should get more as the batteries are essentially "reserve".

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Willie, Tampa Bay
Bert

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Reply with quote  #27 
There is a positive about having solar/battery lights. When the grid goes down you still have lights even if you don't have a backup generator.
The batteries can be expensive but I'm glad that I installed a simple 12v system. I think the batteries will easily last six years or more.
We run led lights powered from solar in 4 rooms. We hardly use the other lights but do some. Also run our small solar collector off of it. So will still get some heat on sunny days with the power off.


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Bert K.
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Reply with quote  #28 
Thanks for all the info,but my problem is when i get something in my mind i usually do it,so my question is do i use 12vt bulbs or 110 with inverter ?.
I have a car lot so have lots of 12 vt car batteries,not deep cycle,can i use more of them ? Thanks
stmbtwle

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Reply with quote  #29 
12v LEDs aren't cheap and you don't have the choices you would with 120v bulbs, which I think you said you already have. It's your choice, but I think you'll be happier with 120v, and I think you'll save more than enough to pay for a small inverter. Price 'em out and do the math.

You can use auto batteries, but they won't last as long as deep cycle. However if you already have some "laying around", use 'em, they're "free". If you have to buy them, get deep cycle.

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Rick H Parker

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Reply with quote  #30 
my question is do i use 12vt bulbs or 110 with inverter


The standard advice is to go 120V with a inverter. The reasons are.
1. The higher the voltage the lower the current, it is current that starts fires not voltage.
2. The higher the current, the larger the required wiring, which cost more, copper is not cheap.
3. 120V is more compatible with the existing electrical infrastructure.
4. 120V appliances cost less then their 12V equivalents, economics of mass production.

I have a car lot so have lots of 12 vt car batteries,not deep cycle,can i use more of them ?

New starter batteries that you can get a wholesale prices or used batteries that you pulled out of cars you have serviced? 

Getting a working battery bank out of used starter batteries would be a crap shot, even if they are all the exact same make and model of battery.  Each of them will have a different history and be in different condition. The bank would be no better then the weakest battery. 




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Rick H Parker
Kansas, USA
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