# Solar Panel Installation For Dummies

Hi this is Amy from the altE Store. We’vebeen doing a series of tutorials where we are showing wiring mismatched solar panels and what makes sense for wiring them; in series, in parallel, or just not even at all. So we’ve been puttingtogether a playlist, and you can see that here so you can watch through with some ofthe other examples we’ve given. So right now, what I’ve got is two 100W solar panels. Oneis a 24V nominal, and one is a 12V nominal. So what we are going to show is they are bothgoing to go through an MPPT charge controller. So going into the battery, we’re going tomeasure them each individually, so we can confirm what we are getting individually.Then we are going to wire them in series,

and we’re going to wire them in parallel.Alright? So, first we’ve got our 24V solar panel and it is going through the MPPT chargecontroller, and it’s going into my 12V battery. So I’m going to turn on the solar input andI am getting… there we go, I’ve got 32.9V into the charge controller, I’ve got 12.9Vat the battery coming out of the charge controller, and I have 5.69A going from the charge controllerinto the battery. Now keep in mind, this solar panel has got an Imp, a maximum power current,of 2.78A. So it’s putting in 2.78A into the charge controller, and it’s coming out at5.69A. So that’s because the MPPT charge controller is taking that high voltage, it’s droppingit down, and then it’s outputting the higher

amperage with the lower voltage, retainingmost of the power. So I’m just going to write this down and then we are going to rewireit so that we’re going to measure the 12V panel. Alright. So now I’ve got my 12V solarpanel, also 100W. So you can see I’ve got an input of about 20V, so my Vmp is rightaround 18V, so it’s actually doing quite well. It’s really putting in a very high voltage, I’vegot perfect conditions here. And it’s going through the MPPT charge controller, and it’soutputting 4., let’s say 4.42A. So that is compared to the 5.69 amps, and it’s also rightaround 13.1 volts. So the Imp of the 12V panel is 5.56A, and I’m seeing 5.81A going in. Soagain, it’s doing really well. I’ve got great

conditions. Because it’s dropping that voltagedown, it is actually increasing that current a little bit. So that’s one of the advantagesof using an MPPT charge controller. You can actually get a little bit better than Imp,or maximum power current into the battery. So, I’m going to now change this around andwire the two of them in series, and we’ll see what we get with that. Alright. So nowI’ve got these two wired in series. So I have the plus from the 12V panel going to the chargecontroller. The minus going to the plus of the 24V panel. And then that minus is cominginto the charge controller. So they are wired in series. And I’m getting 43.8V going intothe charge controller, which makes sense because

that’s the two of these added together, becausewiring in series increases voltage. So now coming out, I’m getting 8.81A (I’m going towrite that down, 8.81A). Because it’s taking all of the current that’s going in, and increasingit as it’s dropping that voltage down to the 13.4V. So, now, we’re going to change it,and we’re going to wire the two of them in parallel and see what we get for output. OK,so I have 24V panel and the 12V panel wired in parallel. Now you see, I’ve got 23V in.Now when I had that solar panel, the 24V solar panel by itself, it was measuring up around40V. But because I’ve got it wired in parallel with this 12V panel, that’s putting out about18V, it’s pulling that voltage down. So it

is dramatically reducing the voltage outputof that solar panel. So just from what we see going in, we can see that it’s very unhappybeing wired in parallel with a lower voltage. So doing the series in, you saw that it hadadded the two volts, and that was fine. So doing it in parallel, we’re pulling that down,we’re greatly reducing it. The current output is about 7A, so we’ve got that lower voltagegoing in, but we’re only around 7A coming out. And we were up in the upper 8 amps whenwe were wired in series. So you can see here that wiring two mismatched panels, if you’vegot mismatched voltages, and you’ve got an MPPT charge controller, wire the two of themin series, let the voltage go through, add

## Solar Panel Installation Which guide

Are you thinking about installing Solar PVpanels at your home? Producing your own electricity from solar is not any great only to the environmentbut it can also save money to the long term thanks to the feed in tariff and it can protectyou from rising electricity bills. But the decision to install solar PV panelson your home is a big one. It can be nerve wracking when you’ve neverseen how it’s done. So we filmed a solar panel installation to show you what happens andthe answers to some of those common questions. But first, let’s find out how the system works. Solar photovoltaic panels generate electricitywhenever it’s light. Light energy from the

sun hits the photovoltaic cells on the solarpanel and is transformed into electricity. Conducting wires carry the electrical currentfrom the your panels to the inverter and then into your home. When it’s light and youturn your electrical appliances on they’ll be powered by electricity your generating. Any excess electricity will be exported tothe national grid. If you turn your appliances on when your panels aren’t producing electricity,you’ll use electricity from the grid as usual. Before the installation process can againwill have to arrange a survey with a reputable solar panel installation company.

And the number of panels that you put on yourroof depends on a number of factors: the size of your roof, the direction which it faces,the amount of electricity that you wish to generate and how much you wish to spend. The installation will be done in stages. Thewhole process can take as little as one day, depending on the size of the system. We caught up with Solar Panel Installationcompany manager Guy Hewitt to see an installation in process quot;The process is quite straightforwardactually. Before we get to the site we would have already surveyed it, so we’ll have produceda detailed plan of what we’re going to do

on the roof. When we arrive if the scaffoldtears up than the towers will be up. quot;The next phase is to mark out and set outthe array on the roof so then we’ll be taking the dimensions that we’ve got be lifting tiles,finding the rafters and setting out where we actually are going to insert the roof hooksinto the roof. quot;The stage after that is, we start installingthe roof hooks. So we lift the tile up, we find the rafters, we then insert the roofhook into the rafter, then the tile would sit back down and be weathered if necessary,and that goes all the way along the roof to create, if you like, parallel lines of roofhooks. After that the rails are bolted onto

the roof hooks and when they’re fully securedand in position then the panels can be installed onto the rails. quot;The vast majority of roofs in the UnitedKingdom are able to take solar panels. They need of course to face the right way. We wouldn’tbe installing solar panels on a north facing roof. We’re really looking for somewhere fromeast to west or south of that. One of the concerns a lot of people have is that there’sa possibility that installing solar panels could actually damage your roof. quot;That is not the case. Provided the rightroof bolt is used for the type of tile that’s

on the building, and the roofers have donea professional job, then the roof will be weather proofed.quot; In the house, the direct current from thesolar panels comes in through this cable and it goes into an inverter box which convertsthe direct current to alternating current, which is safer for your home. And there are two isolator switches there’sa direct current isolator switch and an alternating current isolator switch as safety measures.From here the power is passed around the house and here You have the generation meter whichindicates how much power your solar panels