Help a girl with her electricity please?

[Alterego]

(29 May 2013, 20:03)ErikEst Wrote: since most of the domestic appliances are made for 230V AC so it is more economical to use 12V-230V inverter.
with your 1000W inverter you can power light bulbs, refrigerator, radio, tv, computer as long as total consuming power is not exceeding 1000W. one classic light bulb has 60W power, modern LED bulbs are 7 to 14W, refrigerator has 300 (bigger ones 600W) when its compressor is on, modern tv has about 100W. so you can calculate how big inverter you need or how much light or appliances you can switch on.

batteries, on every 12V battery you can see its capacity shown in AMP per hour (A/h). usual family car battery has more or less 60A/h capacity. means that you can get 60AMPs of current for the 1 hour or 6AMPs for 10 hours.
now we know that one Watt equals one Volt times one Ampere (1W=1V x 1A).
so for running your 1000W inverter on full power you need at least same power coming from your battery. 1000W divided by 12V is 83,33AMPs. this means your battery is only good for about 45 minutes. more batteries you have connected in parallel the more battery capacity you have the longer you can use your lights or refrigerator.
this means you have to cut on electric consumption and use as many solar batteries as you can afford to charge your batteries.

thats not stirctly true....the wattage stated on an invertor is the PEAK power NOT the Actual or SERVICE P.....

why? because they are not 100% efficient

the remaining 25% is shown up as heat..

to be safe i would aim for 75% of the wattage stated..eg 750 watts..

to assume the available power from a 1000 watt invertor is 1000 watts will lead you to the invertor shop in a short space of time...


Alterego