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Batteries

A brief overview on UPS and Inverter Batteries:

Most UPSs use the basic rechargeable lead acid batteries, but in recent of years, there has been an increased interest in other types of batteries as well. These other types are more expensive, but paying a higher price is justified by their longer design life, more recharges or cycles and quicker recharge times.
The most popular battery sizes in this industry are the 12V 7Ah, 9Ah, 24Ah, 35Ah, 45Ah, 65Ah, 100Ah and the 200Ah.

Lead acid batteries
Lead acid batteries are all sealed (SLA or VRLA) and maintenance free up to 12V 26Ah. From 12v 32Ah you start getting the cheaper semi sealed options. The semi sealed products are about 35% cheaper, but with the cheaper price comes the burden of having to make sure that the batteries are never tipped onto their sides or upside down, as this can result in acid leak, which damages the battery and the surface that it leaked on to. The cheaper semi-sealed also won’t have as many cycles and won’t last as long as the SLAs. So where a SLA is typically expected to give you 300 to 400 cycles, you can probably only expect to get 180 to 200 cycles from a semi-sealed. Before load shedding became a regular occurrence, 180 cycles was plenty and you could expect semi sealed batteries to last for 4 or 5 years, but in the last 14 years of load shedding, the service period of semi sealed batteries has dropped to only a year or two. Load shedding has had a major influence on prompting potential UPS battery buyers to consider the more expensive battery options as well.
Gel batteries
These SLAs are filled with a gel that makes them more robust. They can handle more extreme temperatures and they withstand corrosion, shock and vibration better than other batteries.
Absorbent Glass Mat (AGM):
This technology gives these SLA batteries faster recharge capabilities and a higher cycle and service life.
Lithium batteries:
The prices of these batteries have come down substantially in the last couple of years, and as a result, they have become more affordable and very popular. It now makes sense to pay 3x more for a battery that is generally guaranteed to give you least 10 years’ service life or to deliver at least 3000 charge-discharge cycles. Theses batteries can also be remotely monitored and they also charge up quicker than any other battery type. A further benefit is that this lithium technology allows you to add extra batteries to the string at a later stage, say a year or 2 later.
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