Archives for lead acid category
I have 2 12 volt 7Ah lead acid batteries connected together in parallel. This means that the total amp hours would be 14Ah. Can I charge these batteries safely at 4 amps?
Yes. If ur chrgr is 12+ v (better if 13.5v) it will act as a trickle charger, but I have no idea how long to use it with out over charging them and not likely they will chrg at same rate.
I am building a small 70 Ah battery power supply (using AC inverter) by connecting two 12 volt sealed lead acid AGM 35 Ah batteries in parallel. The battery terminals will be less than 12 inches from each other. I’m not sure what gauge of cable is necessary or advised? Any advice on gauge and materials would be much appreciated.
You’re not working with a lot of current. My experience with wiring comes from 12v car electronics, and that puts out many more amp hours than your inverter. A car battery is grounded to the frame using a 4 gauge copper strand cable in many cases.
You’re not going to be using a cable thicker than 4 gauge, this much I can tell you.
Not the length of a cycle but the life of the battery. Thank you!
The lifespan of the battery depends on the quality of the battery manufacturer, and the materials first. But no matter how good the battery, the lifespan is ultimately up to the end user, and how you use it. A good battery, maintained well, and used lightly can last up to 15 years, I’ve seen sailboats, that people live on, have 12 year old batteries. However, most batteries lead an abused life, not lasting more than 3 to 4 years, as people don’t know better.
As long as your battery is charged adequately, routinely, and properly it can last a long time. The warranty for the Lifeline Premium RV and Marine batteries is 5 years. The SunXtender Solar Batteries are at 5 year warranty as well. If you look at the Rolls Surrette Batteries, they last up to 10 years too. These lifespans assume you do EVERYTHING right, guarding those lifecycles to use over calendar years. The rules are pretty simple; You can’t discharge your batteries deeply, or often. You must have the battery bank sized properly to achieve proper DOD ranges.
Then you must guard the cycles, keeping number of daily cycles down to economically dole them out over time.
Remember, batteries like to be kept at nominal temperatures. Otherwise they work twice as hard (hot or cold).
MINIMUM DON’T KILL IT GUIDELINES:
Again, as explained, the battery voltage shouldn’t be allowed to dip below a voltage 15% less than its nominal voltage, this is a full discharge of the battery. (12v x 15% = 1.8v so 12v-1.8v = 10.2v). Discharging a battery fully kills it’s ability to retard sulphate crystal growth. These crystals then inhibit the batteries ability to soak up electricity under a charge condition. Bottom line, when you discharge a battery, charge it promptly as it begins to decay.
Flooded Batteries need water. As a flooded battery breathes, electrolyte is lost, exposing the plates to the air. Once exposed, these plates corrode quickly. Once corroded the plate is unable to accept as much charge. To avoid this, do top up flooded batteries with distilled water when required, just check the water levels every time you charge it up.
AGM batteries do not require water, so don’t try. Overcharging a battery burns off the electrolyte. Be careful not to overcharge a sealed battery, as you can not replace the electrolyte! This leads to premature failure.
For more on how to optimize your systems, I suggest you call or write to BD Batteries.com. For documentation regarding DOD, Lifecycles, and 5 yr Warranties, click on the Lifeline or SunXtender Websites, and download the technical manuals (pdf).
What are the characteristics (volts, amps, Ah) of a regular lead-acid battery with +/- 12 Kg ?
Thank you = )
with the "+/-" I meant a tolerance around the 12 kg value.
Amazing! Try this link 
http://digbeaut.com/2764/acid-battery
What is the weight of a 12 volt, 24 volt lead-acid battery?
Please leave a reference (website, book)
Thank you = )
for example with 60 Ah/40 Ah/20 Ah?
Your question can only be answered if you supply the ampacity of the electrical cell in question. A 12 or 24 volt battery can be as large or as small, therefore as weighty, as you wish if voltage is the only criteria.