How to Size your Solar Power System

[@WillProwse]

After reading some of the comments below, I have noticed that we have some new viewers here that have not watched my other videos. Many of my efficiency and irrandiance equations are covered in other videos and my book. The video above is great for estimating how much power you need, but you can go much, MUCH deeper into these equations. My book covers various losses in a system, battery efficiency and more. If you want to calculate total system efficiency, watch this video: kzbin.info/www/bejne/hpu7n56ejcasr7c If you want to learn more about faradaic or coulombic efficiency of batteries, watch this video: kzbin.info/www/bejne/f52pnZiHqLF9sJI If you want to learn about cost of a battery with factoring in charge cycle life (which can make expensive batteries look cheap, and cheap batteries look expensive in the long run), watch this video: kzbin.info/www/bejne/aYe4aX6pbbd7icU I hope this helps! This video is GREAT for estimating a solar battery and array here in the united states, but if you are near the poles or dealing with local climate conditions that limit solar, you will need to watch my other videos to calculate your system. Also, the SCC needs to be rated at the OUTPUT, with the working voltage of panels or the nominal voltage of battery bank. Voltage open circuit is for sizing the SCC input voltage and headroom figures. Different equation thats covered in my other videos and book as well. In great detail. *Does off-grid solar confuse you?* Check out my DIY friendly website for solar system packages and product recommendations, and so much more! www.mobile-solarpower.com *Join our DIY solar community* #1 largest solar forum on the internet for beginners and professionals alike: www.diysolarforum.com *Check out my Book* Best-selling and beginner-friendly guide to 12V off-grid solar! amzn.to/2Aj4dX4 If DIY is not for you, but you love solar and need an offgrid system, check out Tesla Energy! They will price out a system and get your house offgrid: ts.la/william57509 *My DIY Solar Equipment Recommendations (Constantly updated! Check here first):* 12V/48V Lithium Solar Batteries: www.mobile-solarpower.com/solar-batteries.html Complete Solar System Component Directory: www.mobile-solarpower.com/solarcomponents.html Complete 48V System Blueprint: www.mobile-solarpower.com/48v-complete-system-blueprint.html Plug-N-Play System Recommendations: www.mobile-solarpower.com/full-size-systems.html Complete "Add to Cart" 48V System Kits: www.mobile-solarpower.com/complete-48v-solar-kits.html DIY Friendly Air Conditioner/ Heat Pumps: www.mobile-solarpower.com/solar-friendly-air-conditioners.html *My Favorite Online Stores for DIY Solar Products:* *Signature Solar* Offgrid One-Stop-Shop. Best Value 48V LiFePO4, Victron and Offgrid Specific Heat Pumps: www.signaturesolar.com/?ref=h-cvbzfahsek *Current Connected* SOK, Victron, Mr.Cool Heatpumps and High Quality Components. Fantastic customer support: currentconnected.com/?ref=wp *Litime* My favorite 12V budget battery!: www.litime.com/?ref=XBIA62RFcalHns *Epoch Batteries* My favorite high-quality 12V battery: www.epochbatteries.com/products/12v-460ah-lifepo4-battery-ip67-heated-bluetooth-victron-comms?rfsn=7352625.50494d *Renogy* A classic 12V solar store that has been around for ages! DC to DC Chargers and more! renogy.sjv.io/n1VjXx *Rich Solar* Renogy's biggest competitor! Similar products, but at a better price: richsolar.com/?ref=h-cvbzfahsek *Battery Hookup* Cheap cell deals bit.ly/2mIxSqt 5% off code: diysolar *Contact Information:* I am NOT available for personal solar system consult! If you wish to contact me, this is my direct email: [e-mail] Join the forum at diysolarforum.com/ if you wish to hang out with myself and others and talk about solar *FTC Disclosure Statement and Disclaimers:* Every video includes some form of paid promotion or sponsorship. Some links on this youtube channel may be affiliate links. We may get paid if you buy something or take an action after clicking one of these. My videos are for educational purposes only. Information is subject to change/update at any time. Electricity is DANGEROUS and can kill. Be smart and use common sense :) DIY Solar Power with Will Prowse is a participant in the Amazon Services LLC Associates Program, An affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com

[@WillProwse]

And the 5 hour estimation figure for hours of sunshine a day factors in the reduced output of most solar panels. It assumes your panels are only producing 70% their rated output during max sunshine, and assumes that your panels will trickle charge throughout the rest of the day. That is built into the equation.

[@my_channel_44]

Solar is so much cheaper than batteries, and because real-world conditions require more solar that you spec'd, multiply your avg w/h usage by 10.

[@tengisdoerflinger6183]

I find a battery cold Miller Tech look at it if you have the time and tell us your opinion on it.

[@peteypops]

Thanks Will, your videos are most informative and a great help when deciding what to buy and how to set up systems.

[@racingsponga]

DIY Solar Power with Will Prowse i was going back to Vegas to re-iterate electrical school at ATI, your channel polished my skill n now i can say, you and youtube taught me solar way better than anyone

[@mcpaplus]

I am a well educated old fart, with lots of math, computer and physics knowledge under my hat. As such, sadly I am skeptical of young folks trying to teach me anything. Your videos have completely blown that skepticism out of the water. Excellent videos. You have a huge fan and a new subscriber. Well done, thank you for this info.

[@Comrade_YG]

I bet you don’t know what c# is or JavaScript is

[@mcpaplus]

@@Comrade_YG I do, but I don't know why you would care.

[@thomasthrift349]

Ditto

[@stephendanger1419]

@@Comrade_YG weird flex, windows weenie programmer.

[@koruki]

@@Comrade_YG I know C# and JavaScript from my day job but it’s totally pointless in this context lol

[@angelabrock2298]

I’m a retired marine engineer. This guy has the best , well presented instruction video about solar power for RVs I have seen. Thank you for all the great help with solar for our camper.

[@GripFreak]

Will also has the best book I have read so far on this subject. He's tops in my book. I have a background in vehicle DC electrical and electronics with a specialty in batteries and I have learned a lot from this young man. Will is on another level. Here's a quote I heard years ago: "It's not how long you have been doing something it's what you pick up along the way."

[@grampsradio]

@@GripFreak another way of putting it is "do you really have ten years of experience or one years experience ten times over?"

[@LettiesLife]

He’s amazing. 🤗

[@whatnowok]

I am a retired engineer that makes lots of money

[@kelumo7981]

you guyz are useless engineers if you couldn't figure out this thing without help....htf did you cope at work?or you were just paper pushing the whole time 😂

[@camerongawd01]

I've watched literally 100's of solar videos trying to determine the size necessary for my offgrid solar needs. Will, you are the first to explain it so a noob like me can understand!! Keep up the great work son! You found your calling in life! Fantastic job!

[@dethmaul]

Yeah the fucking articles are just squiggles to me and were pissing me off. Nobody explained what the production ratio or efficiency rating was, but apparently you need that to determine a size? And nowhere could I find what the name of a system means. Like a 4kwh system. 4kwh OF WHAT. Over what time?

[@angelabrock2298]

@@dethmaul apparently you didn’t watch or listen very well. Even our dog could set up a system now after watching this guy!

[@p.b.9428]

⁠@@angelabrock2298You misread @dethmaul’s comment. He’s actually complementing Will’s videos for their thoroughness.

[@tommartin8155]

As a retired building contractor with decent electrical skills, your showing us great new products and how to hook them all up. The dots are getting connected now as we get closer and closer to main stream solar. Great job young man

[@johanswede8200]

Will, I've followed you since you lived in the Toyota RV a couple of years back. You are going places. Makes me feel good. Your not touching drugs or alcohol is paramount. Wish more young people behaved like you. Nobody owes you a thing. You did everything on your own. Respect!

[@brownbunny2513]

So true..👍

[@etienneswart8700]

He is a cut above the rest. That’s why he gets idiots criticizing him. They are 🖕stupid!

[@HerveAttia]

yes, Im 50 and I'm learning solar panel system setup from this smart young man. Not sure how old is William, but I do have a 16yo son and I wish he had those skills or interests. oh well...

[@stevelamperta865]

How do you know he doesn't use drug's or alcohol ?

[@craigd123]

I'm drunk and wired a battery to a mouse. Ain't rocket science...

[@iselili2]

I lost count of the times I have asked this question, and the many people who either don’t know it well enough to explain it or don’t want to, your humble intelligence is admirable, thank you for your videos, the best in youtube❤

[@grahamthorpe3885]

Hi, i have reached the age of 62 with very little understanding of electric and the part it plays in my life. Your videos are both informative and interesting . I am inspired into new learning and will be buying your beginner friendly book. My first project is to set up a small solar powered system to give me lighting and small use of a power tool in my hand built shed on my allotment in west yorks. Thank you, you are a shinning example of your generation

[@scottgordon1781]

am 67 and getting onto my roof :-)

[@hiprofael]

In all of this, how do you calculate what size inverter yo use? Quick answer or do you have a video for that? Thanks!

[@DroneLearner]

For a you person you are very clued up. Enjoy your passion, I'm just getting started into solar i'm 58 and its refreshing to see a young person with a positive outlook on life.

[@t.l.c.5510]

I have been struggling to figure this out for months. I am a blacksmith. I make things hot and beat it into submission. Current is like a slippery snake and won't stay still long enough. Thanks for making this simple. Can finish my camper build now.

[@cynthiahoff1512]

I love your comment. And I agree! I'd rather beat out horseshoes than work with power any day! It may take me a long time, and I'm going to be sore, but it won't strike me dead! 😳

[@cliffordbodden8992]

@@cynthiahoff1512 ohh my

[@markgerloff7928]

You must be popular with the ladies

[@conniefi]

Can’t stop laughing!

[@edwinwise6751]

As an electrician , who knew nothing about solar this has been an incredible insight into what I am about to be undertaking. Thanks

[@bbos3447]

I love how enthusiastic you are about this subject. I can tell you are really into it and have tons of knowledge you want to share with everyone. I’m just getting into this and your videos and website have really helped me in this.

[@dvfreelancer]

Makes me realize what an amazing job the power company does and how much we take it for granted. I was working on a project to power a small window A/C for 6-8 hours a day, so all I have to do is take your example and change the numbers. Great video.

[@wordofhopethroughjesuschri1411]

Awesome speaking. 100 percent . Clear direct and no wasted words in your video... no joking. I am impressed.👍

[@bigsilverbear4187]

You are a very bright young man. I am FINALLY beginning to understand how this whole solar thing works. I might have to watch this a few times before I retain it and understand it all. But YOU have most certainly been a great tutor and a blessing. Keep on keepin' on young man.

[@stevenspencer9104]

Just simply, the more times, I watch these videos, the more I learn. And it is such a cool blessing. Great thanks to you brother Will!, from south Louisiana.

[@emilye709]

Your videos are so clear, organized, detailed and helpful, without being overwhelming. You are a great teacher!

[@WillProwse]

Thanks Emily!

[@Sovoxz]

This is by far the best channel I've come across after searching all over KZbin for a channel which better explains how to use solar energy... Thanks for the update young man...

[@gaetansimard1594]

I really like the way you make complicated things easy to understand. Thank-you for your video!

[@malachygallagher4936]

Hi Brillent video & well explained. I am a solar licienced electrical/security contractor in ireland & it’s great to see someone that does videos like you! Well done! Rgds mg.

[@scout4locations]

Wow, am I glad I found this guy's videos. No one and no video I have found before explains things so well. THANK YOU

[@iselili2]

I think I have asked this to more people than I can remember, you are the first person to answer this intelligently, yet simple enough to be understood. Thank you for that, I love your videos❤

[@Frajenbran9901]

Kudos kid. You are certainly beyond your years. Your explanations are so easily understood. First, thank you & second, keep up the outstanding work.

[@edsonlutepo2240]

Really I have been in the field for almost 10 years but from you I get some thing more especially when we come to calculations of solar panel selection, battery selection and controller selection.

[@ronstrobel9227]

Will saves the day -- again! Yes, "It's so simple," when you aren't as confused as heck! We are newbies at this and have been all over the net and KZbin till our eyes are crossed trying to property size our system for our cargo trailer conversion. We are in our 70s with limited $$ and can't afford to make a mistake... So Thank You for clarifying this so *even I* can understand it! You are a treasure... We are definitely buying your book. ~ Kir in Tennessee

[@aubreyj.tennant1123]

Great job, I’m 70 and starting an RV van build. I’ve been most anxious about having to outsource the electrics because of my lack of knowledge with these kind of systems. This one vid kicked me into a DIY mode. 🙏🏼

[@andredupuis5432]

No one else on KZbin can keep our attention with a simple white board ! Great job 👍🏻🇨🇦

[@PizzaParis]

How to size a PV installation ? Maximum PV first for winter use, maximum battery capacity based on your budget. And that's all :) Your videos are really great !

[@bimmerboard]

I’m an electrical engineer and I have to say that you’re a great teacher! Have you thought about a career in engineering? Well done. Please the videos coming. I’m especially interested in RV applications.

[@jalibbeigh2338]

I need your help. I am planning to create a small solar setup for my laptop as I work from home & there are frequent power cuts. I want to create a setup which will charge my laptop at least 2 times. My laptop has 4500mAH battery & my laptop is 65 watt. My laptop is giving me 4 hours of back up. Keeping in mind DoD of battery is 50% & inverter efficiency is 80% please tell me how much battery do I need? I just need it for my laptop nothing else. Will 24ah lead acid battery work & which inverter will be best? I dont know anything about it & it it should be portable.

[@chind0na]

@@jalibbeigh2338 ChatGPT says: Therefore, you would need a lead-acid battery with a capacity of approximately 73.34 amp-hours (Ah) to charge your laptop twice a day, considering the given specifications.

[@stevenclarke5606]

A brilliant explanation this is the first time that I’ve actually understood what is required, thank you

[@1yyymmmddd]

Amazing clarity of mind for such a young fellow. Respect.

[@YoungGrizzly]

Just got your book today. Read one page and instantly knew i made the right choice. I am doing research for my autonomous lawnmower project and the book along with your videos are a big help.

[@TheVoiceofKevinC]

Wow: Will. I am impressed. you have a gift for Energy.. I have been studying Solar for several decades +; I also taught at a jr. college. I live next door to the Grand Canyon west rim, and everything is Solar. Your approach to instructing is ( incredible) ...Thanks' I will watch more and recommend it.

[@loturzelrestaurant]

Hi and Hello. I gather people for a good cause: I wanna provide people with Links leading to bad or toxic people. Mobber, Racists, Sexists, Bullies, more. I got the Links and i need help with reporting them. KZbin is in a bad state and i think you heard of that. Many complain about it, its strike-system and its CEO: Susan. But... I mean... complaining about the State of the world is nice and dandy, but... how about acting? Doing something? So i made a Wiki where i store Links for all to use. Yeah, unorthodox, i know, but whatever. Its my Try to help. You can at least pre-emptive 'block user' regarding the Racists and all those, but you can also do one thing more and report them. I know this was random and also overly summarized, but think about it and consider. You can make a difference.

[@shayronhines9432]

@@loturzelrestaurant 32 ' -1" ,

[@loturzelrestaurant]

@@shayronhines9432 ????

[@JamesBlazen]

He understands simple arithmetic.

[@TheDevilThatStoleHolyDarkness]

This sums it up for me. Read up on local jurisdictions, No restrictions on land and ready to build this really helped me, I had to measure how much Wh I use in a day and record it for a week or three to get an accurate usage for how much I need to run my home with.

[@royormonde3682]

Another option if you want to use solar is like what I did to my house. I renovated the whole house over 5 years and as I did each room, hallway and common rooms I installed a separate wall sconce light and plug just inside each room, one on kitchen counter plug and 2 outside lights. These circuits went to a separate 8 breaker panel I installed in my utility room. The grid system was installed just like it should be and fully functional. The secondary 8 breaker panel was connected to my solar panels, inverter and batteries. These wall sconce lights and plugs are what I use primarily, I have LED lights in all rooms and hallways plus I have a plug in each room if I need to use. The one in kitchen I use for toaster and kettle. I use grid power for fridge and stove, heating and vacuuming mostly. At anytime I could add more to my solar as I expand it to accept more of what's not hooked to it. If my solar ever runs low I just simply use the grid system which is right there. Just seemed like a good way for me to control what I use. It works for me.

[@Zimbob2424]

I was thinking about doing the same, I'm a remodeling contractor and do my own wiring , so it would be simple and I can do in piece meal, like getting my bedroom running off of solar to start with, just a small system to start understanding it all. I get the jist of it as far as a solar system, but hands on for me is the best way for me to learn. Oh How's it working out for you, it's been 2 years since you posted this ?

[@royormonde3682]

@@Zimbob2424 The system works fine and use it all the time in bedrooms, hallways and bathrooms. Renovating basement now and will add more down there. I charge my phone and run my computer off it, even have the modem plugged into it which is good because power goes off and on all the time during winter and internet signal comes from phone line which never goes out so I'm up and running even in a blackout. For me it was just too complicated to deal with a solar guy, permits, hooking the system to the grid...it was all so complicated, so now I have a closed loop system I did myself that gives me almost full coverage in the house, had to use the BBQ and pull out the camp stove a couple times during blackouts over the last 3 or 4 years. I also put a car charger on the batteries in trickle mode to give them a boost when sunshine is low and they need to be topped up and that's done while I sleep and in the winter only. My power bill went from around 100 a month to 40 and I never go without ever. The nice thing was installing it was an add on, so the house was wired normally to the grid and the extras ran to a separate box which can be hooked to the solar later, you can even take circuits off the main and switch them over to solar at anytime, they're right beside each other. I might add if your in a northern climate and get lots of snow like I do, keeping it off the panels is a relentless job, so I added a steel angle iron frame above them that I can slide 2 x 8 foot plywood panels over them in winter, it's up on an angle 4 feet above the panels and the sun is low in the sky during winter so they don't obscure the light at all and the panels stay free of snow. This only works if your panels are ground based and a single row basically, wouldn't want to climb on the roof to do this 15 feet up in the air.

[@Zimbob2424]

@@royormonde3682 Thanks so much. I live in the back woods of CT. so not too much snow, but lose the power a lot in late hurricane season when it freezes and brings the branches down a lot. We just got a price for a grid tied complete system for $80,000, that ain't happening, and a pushy sales men to. I was wondering if I could trickle charge the batteries off the grid if I went the way you have, so now I'm going to go this route.

[@poisonfortheweak]

This all seems so elementary, but maybe that’s just the way he explains it so well. Seeing it talked through with examples makes me wonder why it intimidated me for so long. Thanks!

[@Steven_VE9SY]

Been a while since I've needed to use Ohms Law. This was a pleasant refresher.

[@sanohdaniel4145]

Hello How can i use 60battery 20Kv

[@weswalker1208]

I'm happy to see you circle around back to the smaller setups and calculations

[@ERDesertFox]

Dude, you broke this down Barney style perfectly! Even a Marine understood everything you went on about. keep up the good work, love ur vids

[@indahpratiwi4308]

Which war did you serve in sir?

[@ERDesertFox]

@@indahpratiwi4308 OIF and OEF

[@BWWGL9]

Yes, even a MARINE! So, that means all of the services will require ADDITION INSTRUCTION ! Haha

[@tawanda321]

Wow, you are a very eloquent person who gave me the exact answers to what I need in order to determine what load-size battery / batteries I need. Boy . . . you nailed this spot on. Thanks plenty for being of great help. Very useful indeed.

[@cheriesomerville7516]

This was massively helpful! We've been operating in "guessing" mode for awhile now, trying to upgrade our 20+ year old off grid system. We have dinosaur components, only just recently discovered there were different charge controllers (PWM vs MTTP) and upgraded. Our current battery bank (lead acid golf carts) is aging, going into their 6th year, so we've been trying to wrap our heads around not only the newer tech of lithium batteries, but, really, for the first time, trying to understand our real system requirements. Again, such a helpful video, thank you! :)

[@psocket6333]

Just a shout out….i have purchased your book via amazon in the past. Between your book/ videos you have literally provided me with a zero bullsh*# education to support myself in my field for work. Appreciated

[@Bunchquitter]

Excellent video Will! I’ve had a solar system on my camper van for about 5 years but only used it to charge phone, tablet and other small items. I’m now considering a 12V fridge/freezer so I knew I had to upgrade. Your video gave me the knowledge I needed to make the right choices in that regard.

[@blake9358]

You can power everything in a caravan or camper van on a 300 watt panel with a pure sine wave inverter rated at 3000 watts and you need a lithium ion battery of with a storage of at least 100 Amh , you cannot charge lithium ion batteries using your cars alternator, which the vlogger seems to be saying, that is an absolute no no!.

[@lowes891646]

Will's book simplifies all this. Don't get me wrong, his video's are GOLD, but his book adds a bunch of Platinum on top. Love it, love it, love it. Thanks for all you do, Will...!!!

[@ne555timer6]

Just in time I found this channel that I have been looking for for a long time. Thank you for your cooperation!!I glad that.

[@MrRickV2]

Will's explanation of sizing your solar power system is the best one that I've ever seen (or read). Thank you!

[@MrBiky]

Added this to favorites. I suggest that people bordering Canada and up, instead of bumping the solar panels by a little, they should double the amount, from 480W to 960W (1000W), because during winter, you will only get around half the sun power at most, than during summer. Also, if you live in a really snowy region, unless you are ok with cleaning the snow off your panels, you might want to invest in some panel heaters, to melt the snow and ice that will form on top of the panels, which means you might have to bump the battery bank AND your solar panels by 20 - 30%. The same calculations for the AC in the summer apply to people living in colder climates, but for an electric space heater. And with the additional costs for countering the dimmer sunshine, it could get pretty expensive to live up north. People near the equator are truly blessed (and also add the ability to grow food throughout the whole year). Edit: grammar.

[@md.noorulkarim5542]

I am a retired electrical engineer from a senior position of power sector. Appreciate the video highly , best wishes for the young engineer.

[@stephrs1754]

Thank you for making this video. It has answered all the questions I have for what I'll need for when I go back out on the road. The math made sense, and having it all there on your white board as a visual aid was super helpful too. 😁👍

[@doublnation]

This is the best video on solar I have ever watched. (30+ hours of research so far)

[@jonathanscanlan1568]

I really appreciated your breakdown of every area. You explain each aspect so much more faster and easier than other like videos. Top job. Many thanks for your contribution. Much respect.

[@joevasquez1776]

You sir, have earned your life . And are paid well because of the value you provide.

[@MrBrianDuga]

I was thinking an excel spreadsheet with these formulas could make it easy to play with the numbers . I have one going for my usage on appliances after testing them with a kill-a-watt to see where the waste has been and try to scale things back. It has lead me to focus on sealing my basement foundation since my dehumidifier runs almost constantly at 600 watts.

[@brandillysmom]

Will Prowse, Your videos popped up when I was at Costco recently and wanted to find out about a solar generator system that is quickly selling out. I wanted to see a video from an independent and knowledgeable source. While watching you critique the Lion LT solar generator, I realized that I should research solar bit further.before buying. I am desperate to get things started, but these days (well, any day!), who can simply afford to just buy solar from these companies? I figured that learning to do some of it myself would save money. I am interested in solar panel projects for small to large projects for my house and mobile, so I will be tuning in to more of your videos. I will also click those links. You are an excellent teacher and communicator. Thank you!

[@IllumTheMessage]

Great stuff. Would love to see a video on setting up a system for a window air conditioner where you run it on minimum batteries. Meaning running it in the hot sunny part of the day from solar.

[@andrepaperini7098]

That's exactly what I'm attempting to do in Florida. I currently have a 24V 1.5kwh battery built out of recycled 18650 cells, and two 335W panels. I'm pairing these together with a Renogy charge controller and a 2k inverter. My plan is to power a small 500W window unit.

[@IllumTheMessage]

@@andrepaperini7098 Awesome, I measured my window unit to be around 500w as well. Let us know how it goes.

[@bakadeshi_aunstudios]

It might actually make more sense to use a high efficiency mini split. Pioneer makes some units that are 21 seer, they really sip power.

[@TheVoiceofKevinC]

@@bakadeshi_aunstudios You Are Soooo right!!!

[@bakadeshi_aunstudios]

FYI I just measured my 9000 btu 21 seer ac unit and it only uses just shy of 400 watts on full cooling mode.

[@bryanbeast8662]

Thanks for putting up this resource. I'm a solar newbie and it's really helping me make sense of the basics.

[@tycanterberry]

If you run an AC 24/7 wouldn’t it take less wattage once it’s actually cooled off inside so it wouldn’t run 500w 24 hours a day right? Maybe overall 4-8 hours daily. Your thoughts?

[@survivalishardstaystorng]

About 3 years ago and I was about to be homeless and live off the grid I found you on KZbin between then and now I don't know what happened new accounts new Google so forth I found you again and I have to say thank you so much for doing your videos

[@jovieong5671]

I'm basically a noob for all these, but i must say you made it so easy to understand Will! Thank you so much! :D

[@KembleGamumpa-gd3nj]

I've been following you from Papua New Guinea until I lost track of you. I'm glad I'm with you again now. Thanks alot for your down to earth Explanations. It is really helping me Quite alot in this part of the world. Thank-you once again.

[@2626dee]

Thanks so much for the videos Will. You are an excellent teacher. I was scared to death of electrical projects prior to your videos. Now I’m piecing my solar components for an off grid system. Totally confident it will be successful. Keep it up sir 😀

[@grampsradio]

I really like Will. His enthusiasm is contagious! :)

[@collegesynewave]

Thanks for you vids, Ive learned more here than in college from lecturers with grandiose notions. Im curious if you have ever looked at a combi pv/micro wind turbine off grid systems in order to utilize the notion of more sun in summer and more wind in winter location dependent ofc too. i would love to see how someone like you would design and implement such a system.

[@speakyourmind2357]

You have thought what I struggled for 6 years to understand. Thank you 100%

[@johnpoulsen7582]

"5000 Wh can power a life". Classic

[@muizzzainal3427]

My objective is simple, set up a solar powered exhaust that will run for 24 hours a day. You have given me the know how, to select the appropriate solar array, battery, and controller. Thank you Sir!

[@DennisWintjes2]

Looking forward to your home based system design.

[@royakalah181]

I like the clarity in explanation. Makes lots of sense especially for DIY enthusiasts venturing into solar space - keep up

[@oceanbrzzz]

Thanks for making this so understandable. 👍👍

[@rudetoy8264]

Very clean and to the point battery and solar panel sizing ever in KZbin. This topic has been thorn on my side for long time… and here you just solved it! I’ll put these formulas on Excel and have fun with it🙃

[@wabash1581]

Hi Will, Thank you for making these videos. As a city dweller in Ohio I know lots of people who want solar power. From your videos I always recommend a grid tied 48 volt system, with as many panels as they can fit on their roof. Being in the city even with a small bit of land, theft is a factor. That makes ground mounting an issue. Any rate, I am curious, if I use 562KwH on average per my bill, and install a 10,000Kw grid tied solar array (let's assume no batteries) am I doing more harm than good? In more words. Should I try to spec my system to be all I need? Or, if I have the funds, should I set up my system to feed back into the grid? I hope my questions made sense. I am not a wordsmith. I am just a basic American human who wants a grid, but also thinks it's possible for me to over buy and feed into the grid as help, not a hindrance. I mean, electricity is only theory. Also, for myself I will have batteries for my needs, but would be feeding back into the grid during peak hours. Side Note: just as I pay in taxes and license fees for roads. I don't mind paying transmission and distribution fees to keep the grid up.

[@mbrad2669]

YEEESSS!!!!! Thank you for the amazing video on sizing a system!!! Every one of your videos I watch gets me one step closer to going off grid- with CONFIDENCE!!!!

[@Previalegend]

The professor is here. Class is now in session...

[@LorE_aka-midwestmemaw8555]

Just ordered your book and it's going to be here Sunday and I can't wait!!! I just bought a vintage Shasta Compact and I really, REALLY want to make it Solar! So I can be off grid with a fridge, my computer and either A/C or heat depending on the season.

[@philippegillet649]

Hi will, love your videos you are a great person, I like the tone of your voice.regards

[@preparetolive7823]

Dude, you are you inspired and it's awesome. It so cool to see someone who's found their mission and is living it day in and day out. Awesome job, Amigo.

[@Okimyhome]

Another great video 😀 You answered some questions I had. Thank you for sharing your knowledge 👍😎

[@Lewlster]

Always thought these calculations were super daunting so I avoided them. U've proven me very wrong, bud. Keep up the awesome and educational content !!!

[@gentlebehn]

Dude, nicely put. I appreciated. Like your KZbin channel.

[@davidjaye710]

i was watching a channel of some off gridders that over paneled their system so as the sun charges their batteries at the same time they operate their house on direct sunlight... I thought that was a good idea. they talk about the costs ..just like you said Will, It's generally not very practical I'm finding without changing some habits and equipment in order to get my daily usage down. On the plus side you are your own person if you can be autonomous that way!!! thanks for all you do Will !!! have a great day!!

[@mikekendall5835]

I have one question.. Can we install this type of system, say 5kw to a home..With UL approved equipment.. Did you do a video on Ul approved equipment?

[@RevoPowerUSA]

Probably not. A lot of renewable energy products are so new that UL doesn't even have a code for it yet. Obviously UL covers solar panels, charge controllers, wiring, etc. But I don't think they have a code for lithium iron phosphate battery packs (consisting of multiple cells) yet, unless I'm mistaken.

[@suzienkambule]

So informative thank you so much. I just installed my system…a 5kVa inveter, 6000amph battery pack to start. I’m in sunny South Africa. And yes we still kept our large appliances off the solar network, they are guzzlers!

[@shahidsaleem5932]

I was looking for something like this it's really interesting 💖

[@norafinley5216]

I am new to this channel. Omg...you blown me away. Such a clever young man. Amazing. The best tutorial ever. Thank you Will 👏

[@morkovija]

Now lets get to advanced stuff - powering your offgrid appliances from tesla or other EV! because if you have 50-100kwh battery standing in your driveway - why not use that?

[@chriseudy4684]

It's a battery in wheels!

[@scleese198]

HAHAHAHA THIS IS WILD. I dunno why this is so funny to me but geez what a concept. Go to work and charge up at one of the public super chargers, drive home and plug your car into your house and use it as a battery bank.

[@jazzyfour]

This is actually very informative. I need to install something in my house in Africa. So this video will definitely help me figure out how to start. Thanks

[@truckcampertraveler7369]

bro you are the shit !!! thanks for this plan and simple explanation !

[@marktheamerican4162]

NATE DOGG you know it !

[@xB1Mx007]

This guy is fantastic, the amount of things I've learned from a few videos compared to how many others I've watched and grasped little to nothing is amazing, your a god sent my guy. Great content.

[@channellwoods]

This is the type of math that needs to be taught in school

[@tannermcnabb4836]

While absolutely true, I'm quite certain it is, or at least where I'm from. These are all equations you would have got in science and physics courses. Not sure about USA education though...

[@channellwoods]

Tanner McNabb I think if the teach all kids this information no matter the level ....all kids should be exposed to this at basic levels....not in the U. S.

[@jorgerosales2176]

I have been looking for a sizing guide like this for a while, and you have made it easier for me to understand what I need to do. Thank you!

[@mikewagemann4129]

Nooo, please dont send me down this rabbit hole of understanding! Just set up my off grid solar teardrop trailer, now I gotta do my house. Not cool man!

[@patriciahibbert6139]

I hate to say this but I must be true , Your videos are VERY good at EXPLAING about the solar power. So now I just look to your ( Will Prowse ) videos and I know I LL be safe . thank you very much , Gordon.

[@cherylellison8455]

I have recently found your channel and am very excited. I have just begun to be interested in solar power and have just retired at 65. I have an insatiable desire to learn everything about solar power and electricity. I do not know where to start with your videos. Jumping around is rather confusing. Thank you for information on the website. I am also considering taking a course at our local Technical College in basic Electrical Power and Control. I really want to understand what I am doing. You have charged me to learn this. Thank you.

[@denimgenes5909]

Your knowledge is supreme and you are so fluid with the most thorough presentation of information. Respect!

[@MrRobbie545]

Thank you very much fo your hard work and explanations of RV electrical etc.. You have made it possible for people like me to see the light at the end of the tunnel!

[@kingsley6376]

I understood how to design and size solar system from this video, and I'm glad I came across this. Thanks man

[@JinKazama92]

I think i have watched 1000s of videos. This is by far the EASIEST to understand.

[@darthmatt4120]

The ONLY video on youtube that I have found that explains this. Thank you so much.

[@jasonwidegren3211]

Wow! What a great way to think about rough system size you need. Thanks!

[@blewis7359]

your videos are top notch and I feel after watching some of you works I can, with competence install my own system. The one thing that I am lacking is the expertise to mount the panels safely. One thing I'd like to point out is that in your example you are calculating that A/C to actually run 24/7 fortunately that is rarely the case. I find that my A/C unit a 4k BTU unit runs about 5hours per day to maintain a comfortable level in y house. So during the summer months when if's 100 + outside I use ~ 53 Kw / day.