Electronics & Appliances Extended use UPS/Solar Batteries?

It took a while but I finally got around to buying a solar panel, battery and a voltage regulator from a motorcycle.

This didn't take long to become a tale of 'the best laid plans of "Mice and Men'. (John Steinbeck).

My knowledge of solar panels turns out to be a lot less than I thought. Technical details for the voltage regulator and solar panel don't seem to be readily available. The solar panel failed so I quickly surrendered having a solar charger.
Two meters of black and red speaker wire and some 5 peso alligator clips from Bernardo's and Bob's your uncle.
My Honda XRM 125 will charge my 12 volt 9 amp hour battery from 0% charge (11.00 volts) to 100% charge (13.00 volts in about 2.5 hours. I jammed the throttle open with a bit of wire so the bike was on a fast idle. If you need the proper connector to plug into the modem just cut off the cable from a cheap power supply. (be careful to get the correct polarity to the modem)

The good new:
Phil Products modem draws 295 ma (o.295 amps) so my 9 amp hour battery will allow me internet access for about 30 hours. I tested out the modem operating from the battery for 30 hours and it worked as planned.
An ordinary motorcycle battery is about 800 pesos and would last for about 10 hours.
For a mere 1000 pesos you can have internet all day.

My next plan is to buy a 12 volt to USB adaptor so I can charge my phone during a brownout. On a side note; it will take about 1.0-1.5 amp hours out of the battery to charge a flat cellphone.

 

So how long will a> 120 amp hour flooded deep cycle will last? hooked up to a PLDT modem? A month.
I use an inverter to hookup my modem, I can then can use 220v appliances, Fans, TV etc.