Update : 3
i get over 100s of PM per month related to Energy problems.. which is very tiring to reply to all, but still i try my best..
thats why Just for general info.. the theory , story and myths about dry batteries
General info about dry batteries
1 - dry batteries are meant for long term storage.. over 5 years to 12 years.. that is why they are expensive
2 - Dry batteries life is determined by the type of technology and material used in it. Typically, 2 main types are made, Gel and AGM. gel have almost 1.5-2x more,life than AGM.. they are also 2x more expensive than AGM as well..
3 - AGM have a general life cycle of 5-7 years.. gel have a life cycle of 8-12 years. hence the price difference.
4 - further enhancing the life of the batteries, is the type of internal architecture.. tubular and flat plate..both gel and AGM can be tubular or flat plate, and hence there is a minor impact on their life increased as well based on the type used.. again, price is different for both types.
1 - they have a very long life compared to our local desi batteries
2 - they are deep cycle, meaning they can give much more backup before damaging themselves.. almost upto 60-70% DoD compared to only 10-12% Dod of local batteries.
3 - they can be charged a lot more rapidly..(Especially sacred Sun). a 100AH dry battery of Sacred sun can be charged upto max rate of 25Amps, while a 100Ah local battery should not be charged at any rate above 10amps.. thus they charge faster, and store charge a lot more.
4 - Specific models are used for specific purposes.. there are dry batteries made for large burst power like crancking and high torque loads, as well as low torque home appliances use. selection must be made based on use.
5 - they donot need any maintenance at all. and can be placed inside your own room without any leakage of gases.
6 - ideally suited for Solar panels and other alternate energy sources..
7 - High torque machines such as AC and motors can be rn on them as well..
8 - ideally suited for inverter AC at homes.
9 - come in very high capacity all the way from 15AH upto 1000AH..
1 - they require a lot of care in planning and usage.
2 - They MUST BE PAIRED with a quality UPS or a charger designed for charging. otherwise like local batteries they ca be overcharged and burnt too.
3 - should use quality imported wiring or high spec local wire with them to ensure complete flow of current without loss.
4 - Must set Ups parameters or charge control to go to high float levels.. dry batteries have a much higher Float and full charge Voltage setting than local Desi batteries.. upto 14.5V.
Clearly their advantages outweigh their disadvantages..
1 - dry battery will burn out with desi ups..
Probably yes..because these desi ups are not designed to work with dry batteries which are very sensitive to voltage and charging rates and DC output variability..
2 - Dry battery has same AH as wet battery , so power is same
its not entirely true.. also wet battery donot have their actual AH printed on them.. a 165AH Exide is actually a 135AH rebranded to 150 then rebranded to 165AH..
3 - Cycle discharge comparison
Dry batteries are deep cycle.. true deep cycle batteries can go as low as 80% of discharge and still remain functional. local batteries canot go beyond 10%.. if pushed beyond, they will be damaged.
4 - Locally made dry batteries are same as imported Dry batteries..
local companies such as homage and inverex and others have manufactured their own brands of dr batteries , some brands claim Calcium enriched..all of they hype they create is just marketing tactic.. none of them are true deep cycle.. they are just repacked wet batteries requiring no maintenance.. or "Maintenance free dry battery".. that is what they market it as, and that is exactly what is .. nothing more..
5 - All dry batteries are same for all purpose.
Absolutely no.. there are many series of dry batteries even in a same company..each series has its specific purpose and thus manufactured according to spec.. if you get an option of battery A vs B and both are priced similarly and they both have same AH, it doesnot mean A is same as B.. A could be a telecom use battery and B could be for a high torque rapid discharge battery.. using one series in place of other will not yield expected results and disappointment.. That is why there are only one type of wet battery selling in PK for decades, while each proper dry battery manufacturer makes 10-20 different series of batteries designed for a specific purpose.
6 - if i buy a gel battery it must last 15 years..
Not exactly.. all companies have different quality and manufacturing.. and many methods of mechanics, and again different price ranges and different regions.. so if you buy a cheap gel battery in tubular design with low price and from an unknown manufactures expect quite a few years less from the expected.
7 - i can use dry batteries with my XYZ ups..
yes, it will work.. but for how long, depends on the quality of the charging mechanism, the output to battery, the voltage control, and filters in the UPS. if you have a quality UPS, expect your battery to remain healthy for many many years, and run at full performance. if your UPS however is not a match for your battery, you run risk of lowering battery life significantly...
Will Update with time...!!!