best 12 Volt bettery in the heat
best 12 Volt bettery in the heat
(OP)
We are looking for 12 V batteries in the 80-120 amp/hour range that have minimal maintenance, the battery will be used with solar systems. The systems will be installed in the desert in South California, where the temperature in summer can reach 50C or 125F .since, the temperature reduces the battery life, I want to know what batteries could be used in this type of environment and if you have a link to the manufacturer.
Thanks,
Thanks,





RE: best 12 Volt bettery in the heat
Lithium cells are good for that temperature range but in those sizes will come at a price. You've given so little information that it is difficult to help: for example, what are the load characteristics? 120AH cells designed for low discharge over a prolonged period will be very different from cells optimised for short duration high rate discharge.
Put up as much information as you can about your application: it makes things much easier when people have all the facts.
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RE: best 12 Volt bettery in the heat
I checked the ni-cd batteries and they are around $2000. from my research the ni-cd are indicated as best solution. For low maintenance lead-acid batteries the absorbed Glass mat is recommended and is around $280.
ScottyUK you mentioned lithium but I think they have short life time.
I had in mind to try multiple 12V NiMH battery back do you have any suggested related to NiMH batteries and how to charger them.
RE: best 12 Volt bettery in the heat
What do you mean by 'short lifetime'? 'Lithium cells' covers quite a broad range of different cell chemistries. From my admittedly limited understanding, most of the lithium technologies are pretty good in terms of low self discharge and have equal or better service life (# of charge / discharge cycles) compared to other cell types. An applications engineer at (e.g.) SAFT or Lithium Technology might be worthwhile.
Have a look at http://www.lithiumtech.com/602050HE.pdf for an example of one of the larger cells available.
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RE: best 12 Volt bettery in the heat
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RE: best 12 Volt bettery in the heat
ScottyUK you are right about the size range. my idea is to have 12 volt pack (10 ah) in parallel; I don't know if this will work. I so online some 12v 10amh NiMH batteries. as you said there is the problem of equal discharging and charging.
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the charger:
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ScottyUK, I contacted GAIA by email to get an idea about there prices.
RE: best 12 Volt bettery in the heat
http://www.lifelinebatteries.com/
RE: best 12 Volt bettery in the heat
Following scottyUK advice I dug more about lithium batteries. I found some information about lithium ion phosphate. Valence batteries are not bad; I don’t know the price yet but I hope is not too high.
I mentioned before NiMH battery pack solution, do you have any idea about the type of problem that I could have with that type of solution. Also, if has some suggestion about the advantage and disadvange of using lithium ion phosphate, feel free to mentioned.
RE: best 12 Volt bettery in the heat
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If we learn from our mistakes I'm getting a great education!
RE: best 12 Volt bettery in the heat
The battery are charged by a solar panel the maximum amp is 4.8 amps, the minimum hours of charging per day is 4, Number of consecutive days without sun is 3.
the battery will power a system that has a continuous Dc load of 3.7 watt and 0.6 watt load for one hour a day also the battery will power a gate that has a DC load of 324 watt for few minutes a day (total 1.4 hours a week).
I have 12.7 Ah a day and 3 days without sun * 1.2 = 76 Ah. (100Ah to safe)
RE: best 12 Volt bettery in the heat
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RE: best 12 Volt bettery in the heat
RE: best 12 Volt bettery in the heat
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