I'm looking for a electric / electronics specialist to help me to design an economic solution for backup 4 computers, 1 router, 1 switch, 4 access points (1.5Kw) for at least 4 hours when commercial power was cut. It's not usual event, but it can happen once a month, so I would need that UPS feeds with energy for at least 4 hours. I was reading on internet a good option could be using gel batteries, inverter and circuit to charge batteries, control battery voltage, . It's just an idea, I'm pretty sure you will have a better proposal . By the way, the equipment use 220v. On the other hand, would it be possible to make double conversion from AC to DC and DC to AC for feeding my equipment when commercial energy is ok, I would like to protect router and switch from harmonics.
Please, contact me to give you more detail and talk about your proposal.
Thank you so much for your attention