So, what I'm hearing people here say is something like:
Mains ==> battery charger ==> 12v Battery ==> buck converter (If needed) ==> fuse ==> connector for router/ont etc.
I have questions
I think a lot of answers depend on load so lets define that:
1x switch (Dlink DGS-1008A) - 4.8w max
1x ont (Huawei EchoLife HG8040H ) - 7.5w max
1 x AP ( Asus 86U ) - 15w max
1x Raspberry pi 3b+ - 2w max
So - I'm looking at around 30w, and want it to last for 4.5 hours (stage 4 in my area).
So the battery needs to 30w * 4.5w * 2 (don't want to discharge it more than 50%) = 270 watt hours / 12v = 22AH. (Yeah - I've ignored inefficiencies as well - so, lets jack up the battery requirement to 30AH just in case).
Assuming my back of the envelope calculations are right - what charger, and what battery would people recommend? (We probably need to factor in the fact that in the load 4 schedule, we sometimes only have 11 hours of charging time before the next cycle.)
I'm curious as to what the fuse setups would look like as well?
A bonus question - how would one monitor the performance of this setup - I get battery levels from my ups - I'm guessing I could monitor the battery level via the pi somehow?