Solar Panel Power Inverter?

You sure can. All the inverter cares about is having enough voltage.

When the sun is going down, my 3000 watt inverters keep putting out voltage until the last minute. Diminishing with time of course.

Do the math.. 80 watts at 12 volts = 6.6 amps (if you get a 12 volt module) You need to charge the battery at a 10% charge rate, the battery size would be 66 amp-hour. The 1200 watt inverter at 12 volts will pull from the battery 100 amps to run the load. You need a min of two times the battery power just to start that large of a load. So 200 AH in batteries or the inverter will shut down the minute you put a load on it because of low voltage. So now you know you have to have a 200 AH battery bank and 10% of that is 20 amps. You can get away with 5% but will charge slow. 20 amps times 12 volts is 240 watts in solar modules and that is only if you are using an MPPT charge controller. Solar modules are not 12 volts they are more like17 or 33 volts. The batteries are the stronger of the two and will pull the 17 or 33 volts down to 12 volts so you loose the amps of that other 5 or 21 volts and end up with more like 15 or 5 amps or a less. There is a little more to it then just wiring it together and watching it go.

Ok, you have a 30 watt solar panel which will put out about 2 amps or so in direct sunlight. I assume that you have a storage battery and probably a voltage regulator to keep from overcharging the battery.

As for the power converter, just assume that it has to run from the battery and the solar panel is just there for charging the battery. Even without the solar panel, you can run any size inverter you want as long as the battery will stand the load. A car battery or anything larger will stand the 300w inverter without any problem. the battery will eventually run down of course. The actual amount of power that the inverter will draw is in proportion to the amount of load that you have plugged into it. Just having the inverter turned on will waste a little power, perhaps as much as 1/2 amp (about 6 watts at 12 volts, volts times amps = watts). If you have a 30 watt load plugged in, you will consume about 36 watts which is about 3 amps. If you run this load for 5 hours, you will have consumed about (3x5) 15 amp-hours. If the solar panel puts out 2 amps, this will take about 7.5 hours (a whole day of sunlight) to replace. Increasing your solar array will obviously shorten the time.

If you want to know how much you can be running without draining the battery, this is going to be about 30 watts, less the loss in the inverter. This is mid-day with sun directly on the panel, it will be less in the morning and the evening.

Solar panel electricity systems, also known as solar photovoltaics , capture the sun's energy using photovoltaic cells. These cells don't need direct sunlight to work they can still generate some electricity on a cloudy day. The cells convert the sunlight into electricity, which can be used to run household appliances and lighting. Batteries are installed in these converters to store the energy if the connection to the power grid is not established. The solar inverter manufacturer produces these inverters for different uses and needs. There are various types of users depending upon their requirement. They come in different configurations and different sizes can be used in small homes as well as large industries.

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