These are my thoughts as a newbie here. There's probably glaring errors so I hope some of the smart people will correct me!
Just food for thought...
2.17kWh battery....roughly a 180aH battery? Discharging down to 20% remaining power would mean you have maybe 145 battery amp hours to work with with a fully charged battery. System losses of maybe 10%....drops available amp hours down to around 130aH.
You have 500w of pv panel. With the MPPT scc maybe a 90% efficiency, so 450w of power.
I'm not sure of your location, so solar sun hours are unknown...even in Canada there is a fair amount of variability. Thinking optimistically, let's say 3.5 sun hours averaged annually per day (more in the summer~5), less in the winter~2). The 450w pv system will *roughly* provide 130 amp hours per day. The max amp hours available from the battery appear to be fairly well matched to the pv panel production for the *average* sun hours....provided every day is a good, sunny day.
So, for clear blue skies you can burn 130aH a day. The 900-pound gorilla in the room, though, is a rainy day...or two rainy days. You need to consider conserving some of those amp hours for "no sun" days. One rainy day...cut the usage in half. Two rainy days, better cut back to a third of the usage...around 43aH. More pv panels and more battery capacity extends the run-time during "no sun" spells.
In all of this, don't forget that the inverter will require a portion of that power....probably 15-20%....?????
But, anyhow, I would do an energy audit to see what my needs are. Check the amps used on the appliances that your interested in using. Then figure the amp-hour use of them. Your modem uses maybe 0.25amp...so in an hour it would use 0.25 amp hour....four hours would add up to one amp hour. Something that uses 10-amps will use 10 amps over an hour period. Something running 1.5-amps will use 1.5 amps over an hour period....1.5aH. Two of the 1.5amp devices powered for two hours would use 3 amp hours. Etc., etc.,... Time x current. Take the anticipated usage amounts of your devices and subtract the total of them from the 130aH production of your pv system...for a "sunny day" calculation. Don't forget to look at the "rainy day" scenarios, too. And, don't forget to include inverter losses.
Your battery has the capacity to store all the daily production of your 500w pv system. But, your pv system cannot restore your completely discharged battery...only around 130 amp hours and on a sunny day. So, live within your means regarding your amp-hour usage and all is well. (Again, don't forget about those rainy days.
These are some jumbled, disconnected thoughts but maybe they will give you figures/ideas to look at.
Best wishes!
Ed