When the solar panel doesn't have a load connected to it, its output voltgae will be higher than the rated voltage.I'm not sure what you mean by the open circuit voltage in full sun being greater than 12V.
I would advise using the panels to charge batteries.So, I'm just tossing around ideas of building my own inverter and thought starting with 120VDC might make things simpler and cheaper...
Why would I only be able to power something that has a resistive or switched mode power supply?
Okay. So you're saying, if I design it to provide 120VDC to the batteries (or inverter), then I should expect the voltage to be much higher (possibly high enough to damage the cells) if I disconnect a lead (possibly for maintanence). Is my understanding correct? If it's open circuited, then I wouldn't think there would be enough current to do any damage.When the solar panel doesn't have a load connected to it, its output voltgae will be higher than the rated voltage.
That is my long term goal, but I wanted to get a small system started now that provided some immediate benefit. That would be with solar panels directly powering the Inverter. As I save more money, then I'd like to buy batteries and improve my system efficiency.I would advise using the panels to charge batteries.
Just configure them to give whatever voltage is suitable for the inverter.
Yes, I have. Please read my responses to this post. The cost is too high.You may want to check out a Grid Tie Inverter if you want it to tie into your home AC.
Great. That's exactly what I'm trying to figure out.Sure but the voltage will vary wildly.
I've never been one to follow the already paved road. I like to explore un-cleared paths in hopes of maybe perhaps stumbling upon a way to lower costs...Currenty Solar energy and cheaply don't go together. It's a long term savings but has a high initial cost.
I know what you mean! The 'End Of The Road' sign stops most people from ever traveling any further. Yet for me it just means I am getting to the fields I go to work in.I've never been one to follow the already paved road. I like to explore un-cleared paths in hopes of maybe perhaps stumbling upon a way to lower costs...
When I first posted, I was looking at the 200W Grid Tie inverters for $200 each. Meaning you pay $1/Watt just for power inversion. While I was researching today, I came across the Outback. You can get them for $1800 on eBay. Its still not cheap by any means, but the cost ends up being half ($0.50/Watt) of the others ones I was looking at.Thought you wanted something cheap, that OutBack is over $2,000
Interesting...I personally build my own Grid tie equipment.
However thanks to our ever so diligent bureaucrats all non UL or government recognized certified Grid tie devices, solar panel, wind and micro hydro systems may be getting put in the illegal category.
But then you could go pirate AE too! Illegal as all hell but far cheaper, viable and very cost effective!
If I actually have to pay someone to do this project for me, then it looses all it's sex appeal.I would find a solar contractor in your area and get an idea of size and cost of a system large enough for what you need.
Spending $$$$ based on forum advice is probably not the safe bet.
The write up on the basic no frills bare bones GTI concept is right here in the AE section.1.) Have you shared/posted your schematic and design notes anywhere on line. I'm an EE and would be very interested in studying them. As long as your system is designed to shut-down when grid power is lost, then no one would ever know the difference!
2.) Pirate AE? How would you do that, steal panels off road construction equipment?