this is not so simple and secondly the solar is the most expensive solution, you won't save on electricity.
unfortunately in the philippines the climate is hot. average temperature is 32C, but under the sun the panels get much more hotter. solar panel output significantly reduces with temperature, the higher the temperature the lower the output.
solar panels can be monocrystalline or multicrystalline, monocrystalline panels are more efficient but also more expensive.
i have monocrystalline BP Solar 12 70w panels installed, at a cloudy day (when panels don't get hot) you can get around 700W when sun comes completely out of the clouds, but when it is hot the output is rather around 500W at a peak, now it also depends on the time of the day since sun angle is different so the output will be different as well.
inverter - it is important not to buy made in china inverters, since those are not reliable and are very likely to fail shortly, the next cheapest is made in taiwan, but you need to know good suppliers. i have here 2 inverters - gride-tie PCM to use the panels when no outage and grid-off beam electronics for outages, both taiwan. the 50K pesos grid tie inverter since february generated around 400KWh, which is 4K pesos, and panels I bought cheap around 16K pesos per panel and the grid-off inverter costs around 20K for 1200W model with 2400W peak. also wiring is not cheap, the cheapest to use is welding wire, i'm using relays to put the panels from sequence to parallel to feed inverteres.
thus the cost of the system is about at least 250K plus deep cycle or other battery cost, 6V GM sold battery costs 6K+, for 24V system you need at least 4 batteries for 220Ah system so at least 25K more.
conclusions:
install solar system if outages are problem in your area, but it will be cheaper not to buy solar panels, you can buy instead only batteries and inverter with built in good charger, so you can run generator for an hour to charge batteries or for short outages no need to run anything - to have lights/fan/tv/computer for around 12 to 24 hours. then the minimal cost of the system will be 4 batteries + inverter, or 25K batteries+20K inverter plus wiring will be 50K or to add 4 more batteries to have lower discharge and longer backup time - 75K, you save 200K+.
20w or 50w single panel is just a toy, it cannot run anything and it won't pay off if you try to use it to save on electricity.
if you really want such a panel e.g. to charge cell phone or run a small fan - buy a yuasa 12V battery, 900 peso 500w car inverter in cd-r king and maybe you need a small solar charge controller, so the battery won't be cooked, depends on panel output voltage, but it is cheaper to have few more batteries, charging them from mains with a normal charger. if solar output is not enough and you load too many appliances - the batteries will have high chance of deep discharge which results in batteries failing after not so many charge-discharge cycles.
again, my advice is not to buy anything made in china related to solar, i bought initially off grid "local" (made in china) inverter, like shown on those pictures (check alibaba site), it lasted only for couple of months, voltage output not stable, in the end mosfets burned, i didn't waste time on repair and ordered one from taiwan, no problems since then.
unbranded 50W panels for 22K is too much it gives almost $10 per watt, it should be around $5 for branded monocrystalline like BP-Solar or Sharp, multicrystalline even cheaper, e.g. in US they sell multicrystalline Kyocera KD205GX-LP 205W for $653.00 or little more than $3 or 152 pesos per watt, so 50 watt panel would cost 7600 pesos only, if the price was in the Philippines as well (Japan is closer to Philippines than US so shipment is even cheaper) then maybe I would think about upgrading my solar array, my advice to the seller - get good quality brand stock like Kyocera and sell by reasonable prices which is more than twice less from what is sold here, then maybe you can still make a good profit, if you are interested in good quality made in taiwan true sine wave inverters pm me i'll give you a lead to the right person there i know, like $250 per 1.6kva (1200w) model, if you buy many items they'll ship you by sea and the shipment will be cheap, why to sell garbage.
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