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just to give a general idea, it will be combination of 2 SLA Batteries, which will give 12.6 volts. Using regulators and capacitors, it will provide regulated 12v/9v, as per requirement
then there will be a charging circuit, that will use a ready-made adapter, and some transistors, that charges the batteries, and limits charging current, and doesnt overcharge the batteries.
thnx but something i wud like to ask there that how long it will give power to my Router and Modem … ???
m live i Karachi and there is 6 to 8 hours of load-shading 2 2 hour 3 time some time 4…
anyways main point is i want 2 hours backup and how long it will get full charge ???