Brownout vs Internet Connection

50 inch smart TV, Sat box, router and modem and some fans. My battery bank is 240 ah. I was thinking 3kw system when I upgrade so need to have a higher capacity battery bank to run more appliances.

So, if I was to use LiFePO4 and my electric bill is 3,000 a month, how many lithium batteries would I need?

 

3,000 PHP per month is a low electric bill. I would not be able to size your system based on the electric bill alone. I would need a list of what you want to run and for how long.

Most of my solar and battery experience is completely off grid on a boat. Includes small refrigerator, occasional microwave, occasional power tools (3 total) during sunshine 1200 wh overnight (computer with 30 inch monitor, lights, small refrigerator).

Even now on land, I tend to use 12 volt for as many things as possible. (Fans, Intel NUC computer, 12 volt monitors, etc.) This reduces the loss of going through the inverter. When running off of batteries energy efficiency is critical.

If I was on the grid I would only want a back-up for my entertainment and fans. Why bother with the hassle and expense of backing up the washing machine, etc?

I have a few light bulbs with their own batteries in light sockets here and there around the house. This way there is light during brownouts without having to get involved with the house wiring. Somehow these light bulbs sense when there is no electricity. During brownout if the switch is turned on they turn on and turn off when the switch is turned off.

https://shopee.ph/CATA-LED-Light-Bu...rproof-IP44-i.375461370.3683119718?position=7

 

Are you tracking your consumption with a Wh meter? These total the watt hours consumed. As I remember resetting these involves pressing a little button with the tip of a pen.

50 - 100 Amp Note the energy Wh in the lower right.
https://shopee.ph/20A-50A-100A-Digi...ctor-Amperimetro-Shunt-i.266699902.4142136906

50 Amp - 300 Amp shunt
https://shopee.ph/PZEM-015-PZEM-013...-Voltage-Meter-monitor-i.277704323.8732283112

 

Many thanks for your time and links for information. For now I'm going stick with what I'v got, maybe get two PV panels hooked up to my 240 ah flooded acid batteries via a MPPT solar charger, just for the entertaining devises.
If I'm here in 5 years time maybe look at upgrading my system with lithium batteries.
Cheers.