Hampton Bays, NY
reply to surendra
Re: it is safe for ups inner circuit while changing an SLA battery in a UPS unit with a standard sized motor vehicle battery will work, the long term current supplied by a motor vehicle battery is short in terms to an SLA battery, a motor vehicle battery is designed to supply high current in a short time, so dont expect much more of a longer run time using a motor vehicle battery.
a few issues if you choose to use a motor vehicle battery:
1) the motor vehicle battery will generate hydrogen gas when being charged/used, so keep the battery in a ventilated space.
2) the charging circuit in the UPS is designed for an SLA battery so it will not "fully" charge a motor vehicle battery even though a motor vehicle battery will work, it wont be "full potential".
3) the battery will eventually "sulfur" and the run time will get shorter and shorter over time due to the way a UPS charging circuit is designed for an SLA battery.
its better to use a sealed "gel" type battery that is designed to deliver current in the long term such as those for RV trailers/boats.
most UPS units are designed to work at 24 volts dc and most common batteries are 12 volts so you will need to get two batteries and connect them in series to get 24 volts.
if you choose to use an external battery, use a large blade fuse from at least one terminal off each battery rated 20 amps higher than the maximum current you intend to draw from the battery as well as using the correct type gauge wire to deliver the current.
the bigger the battery, the longer it takes to charge from the UPS unit - overkill isnt necessary, typically, doubling the capacity is sufficient.
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