An example: a setup in 24 Volts, we used a combined setup with 12 Volt panels, so 2 panels in serial and 2 serial chains switched parallel. The expenses are about the same as a regular 12 Volt setup, but we use less current this way, and the efficiency of the inverter is a lot higher. Since it’s becoming a 24 Volt setup, we need an extra 12 Volt battery of course.
The 100Wp panels are ’12 Volt’, but that always means a higher output voltage is generated to be able to charge a battery:
- Rated Power: 100 Wp (Watt peak) ± 5%
- Rated Voltage: 17.3 Amps
- Rated Current: 5.78 Amps
- Dimensions: 45.7 x 26.4 x 1.38 inches
- Weight: 19.6 lbs
We guide the cables from the panels inside and connect it to a charge controller that charges the batteries, watches over and under voltage and outputs to a inverter that makes a waveform 110Vac. Add some circuitbreakers on both the DC and the AC side, mount everything in a cabinet or on a board and it could look something like the photos on the right.
This setup generates up to 110Vac/9Amps enough for lighting, refrigerator, small electonics (like a laptop and a phone) and some occasional powertool.
What does it bring … 4 x 100 Watt is 400 Watt right? Yes except for the small p behind the Watts, so that makes it Wp (Watt peak). Actually it means that you will get a 100 Watts from the panel at peak.
Environmental influences on the panel power output:
- Sun, very obvious, but a sunny day brings more than cloudy or rainy day.
- Being in the shade and unclean panels, one panel in the shade can influence the whole grid, also leafs on one or panels should be removed.
- Location, in NY a panel will have about 50% less efficiency than FL.
- Angle to the sun, optimal is better, both horizontal as vertical
The output of a panel won’t become zero if ideal circumstances aren’t met, sun and clean panels are the most important. Location is very nice if it’s sunny, like our example located in Georgia, so pretty sunny, on a annual average, so summer and winter it brings about 600 kWh.
That would also mean an average of 1.64 kWh a day, so only 4 hours of sun instead of the average 9 a day? No, this is just average annual output.