I only have access to electrical power via a generator for now, and need to continue to power the wireless router & cable modem even when the generator is out for a good part of the day or night.
Since the cable signal is still there, it only needs the modem & router on so that I can use the laptop on battery to work without the generator. I hope to be able to make a battery source for this setup to run for about 8 hours before recharging is needed.
The wireless router adapter is 19v 1.75a, and the cable modem is 12v 2.5a. The difference in voltage on these seem challenging. I wonder if I can just wire directly to these units from the correct batteries (what types?) because they're DC. Maybe even use a small solar panel to keep the batteries recharged and don't have to resort to the generator for most days.
Since I'm clueless on these matters, please help design this setup and explain what I'd need to do/buy to make it work. Safety is certainly a concern. I can put the battery outside if needed & wire it in, but it needs to be fire safe. Thank you!