I’ve updated my system by adding more components, this is to bring various parts of my house (mainly my home office) off the grid. I now have dual MPPT charge controllers, 2 new 200W (400W in series) panels. This will give me 670Watts total capability. I’ve also included more safety features such as equipment grounding, and better disconnect switches. Safety is critical when dealing with any type of electricity. I’ll include a link to my new schematic diagram for any who wish to see a diagram of the component layout. Any questions or comments please feel free to leave a note or two. Other useful links; photovoltaics.sandia.gov photovoltaics.sandia.gov Link to schematic: dc415.4shared.com
25 Responses to “DIY – Home Solar – Partially getting off the Grid More Safely”
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HELP! I have two, 36v solar panels. Im trying to build an “off grid” system. I noticed a lot of people using 12V or 24V charge contollers. Is that safe or should I be using a 36V charge controller? what should be the proper amperage?
Thanks.
Good video .
In the description of my video “DIY-Home Solar-Why do it and What can it power” are links to my schematic and free ebooks that tell you how to design, operate, and maintain stand alone solar systems. Should be more than enough to get you started.
I’m new about solar can u send your diagram in what you did in your system.. thanks
would have been interesting but you spend to much time telling people to contact the MFG.
Your video is very interesting,thanks ★★★★ It’s much cheaper just do it at home – I have 6 solar panels…and I posted my plan how to..
★★★
Thanks, yes I know you were just kidding. Also, it was a very fun thing to do. Take Care.
well done. Of course you know I’m simply yanking your chain. It actually looks like a well thought out system, and a lot of “Guy Fun” to put together.
Your right it can seem a bit convaluted, but it does work. Take Care.
Wow… seems a bit convaluted. Beware of the uranium isotope 141.
Thank you for your comments. God Bless and Take Care.
Outstanding video, very informative! Thanks for sharing.
God Bless!
The website is speaking in general terms in relation to the numbers, and is using those numbers as examples. Not all MPPT controllers use the same algorithm to determine the max power point thus making the DC to DC conversion different for each, but generally you can reasonably expect a 30% boost from good controllers. The main point of mppt’s is that watts in = watts out, they lower the voltage to increase amps, decrease amps to increase voltage, the power (watts) stays the same.
the full url is wwwdotwindsundotcomslashChargeControlsslashMPPTdothtm
if that is the case, would your 12.8a be 15a? Since you have 2 200w panels at 7.62a? Like I say, I am a novice.
this is from wwwdotwindsundotcom
How Maximum Power Point Tracking works
Here is where the optimization, or maximum power point tracking comes in. Assume your battery is low, at 12 volts. A MPPT takes that 17.6 volts at 7.4 amps and converts it down, so that what the battery gets is now 10.8 amps at 12 volts. Now you still have almost 130 watts, and everyone is happy.
can’t seem to get my comments to post.
Thanks for your comments. What are the differences you speak of?
First, I want to say that your vid’s are very informative and educational. I admit that I am a novice and still have a lot to learn. I could not help but notice a difference between what this video seems to portray and what I found on a website
Thanks for the comments. My tri-metric 2020 works really well. I don’t have any complaints about at the moment. I think a good battery monitor gets to be more critical as your system grows. Take Care.
great setup, wish i had a good battery monitor system my dam wellsee 60amp works great except it don’t stop charging when the charge light goes out, my 20amp wellsee seems to work find. anyway i gotta clean and straighten it up a bit. and make an update video.
Lol, I figured it was just a slip up. And thanks for the reply!