# DIY Solar Jon

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• Hi ronniereycanete, I am not expert in solar systems..But I can suggest one-thing which is about the input voltage of inverter. It may be in out of range.

• Quite easy: If your inverters efficiency is eg 97 %, you should calculate 1800Wh/220V x 1,1There is a plus of ten percent (for sure) included.You also can calculate 2000Wh/48V.That means that there is a need for approx. 50Ah batterycapacity. It is better to oversize a lil bit.

• 2 weeks ago

I enjoyed my DIY Solar with 15 pcs.100Watts panel or 1500 watt peak in my residence and I'm operating it form 8 am till 4pm to make way for some battery reserves in cases of power failure..I always keep my 24Volt system of 4 pcs. 200AH Batteries run on minimum 25 Volts to prolong my battery life. Now I am planning of adding that 2nd set of 1000 watts in a separate system..

• Can you give a good option on this..I have an existing solar set up with 1500 Watts Peak total. I'm contented on its performance and was happy viewing my electric cost slashed by few hundreds. My plan is to add another 4 panels or 1000 watts peak to the existing solar set up I had and I'll using another set of solar panels. My question is as follows: Assuming all is well as planned, Can I connect the 220 volts output coming from the new separate inverter of my new 1000 set up to the existing 1500 watts peak set up inverter output? My other question is assuming it will work, will my output Voltage of 220 Volts stays at 220 Volts while the over all Amperage of my self generated power coming form the 2 sets of 1500 Watt Peak and 1000 watt peak will increase? Thanks a lot and kindly email your answer to philtronics@gmail.com. Thanks again ED,...

• Hello Ronnie, my name is Robert and I might be able to assist you here with your situation. This is perhaps complicated, but math never lies. The 100 watt mono solar panel with a 20 Amp Charge Controller only deliveries to the battery (12 Volts X 5.7 Amps )= 68.4 watts of output not 100 watts. Think about this for just a minute, you can only draw a maximum of 50 Ah from the battery. Therefore 50 watts for 1 hour = 50 Wh / 12 Volts = 4.166 Amp hours for every hour that light is on. Lastly a 1500 Watt inverter requires about 125 amps of current at full power. You are playing with fire my friend. Be safe and use a 300 to 500 watt inverter with this 100 Ah battery.

Hey Richard, just curious what type of charge controller you have, MPPT or PWM. Can you give the specs on the panels Vmp and Imp.

Hi Alvaro, my name is Robert and I hope you are checking back here for answers. Do you want to know how many amp hours you are removing from the 48 volt battery bank. So then 220 VAC / 40 Amps AC = 8800 Watts of electrical appliances. Divide by the 48 Volts and you are drawing approximately 200 Amps DC. Let me know the size of the battery bank, I would be interested in pictures as well.

• Hi i want to run a 18w led solar street light with 40ah solar battery. How much backup can i get from it? Can i get 20hours backup.? www.SolarEnergyPanels.in

• I have a problem with my solar power system, my panel is 100wts mono, battery 100ah 12vdc, controller charger 20A, inverter is 1500wts DC-AC, total LED BULB load is 50watts, But my system will light for only 3minutes and it will shut down, my thinking is my inverter which is too big for the system,maybe? I need advised. Now I am running it DC supply and it works Good. But I need to know if iwill used the inverter 1500 watts only 3 minutes the duration. The Battery I charge it for 3 days before I energized my system. Any comment?

• I used to have big problem finding effective ways to build my solar panels and maximizing my solar power.But I am getting better result now, after I stumbled upon this excellent guide I found HERE. It was a godsend. It gave me great Solar Panel tips and showed me what I was doing wrong before.

• Not enough info on your set-up to answer this question accurately. it takes 745.7 watts to run a 1hp motor continuations, this does not take in to effect start-up energy on said "0.5hp submersible water pump" ... hope this helps you out!

robert, please have someone call me 269 838 9136. I'm doing a start-up solar company. I'm wanting to offer pricing on l-ion's as well as my hybrid L.A. batteries. Thanks Dan.

• wait what? Why you need 240 v to power your inverter?

right, but you are never going to charge those batteries with 2 panels...

• Awesome post! I honestly love the idea of solar and am thinking of getting some panels myself. My only problem is that there are so many different types of solar panels out there. I recently learned about flexible solar panels from this website.http://www.bestsolartech.com/best-flexible-solar-p...My only question for you is are these type of solar panels good to use on a house? Or are they mainly used for things such as RVs and boats? They seem like they would be a good option, but idk the pros and cons of each. Any guidance would help!

• JaredR26 followed DIY Solar Jon1 month ago
• I put together an off the grid solar system recently in Southern California. I currently have 7 x 100 watt Solar Panels, 4 deep cycle 12 volt 114 amp hour batteries in parallel, and a 3000 watt Pure sine wave inverter. It has been running pretty well, I am considering adding 1 more battery for storage and maybe 1 more panel. If anyone has in advice or sees any issue with my setup, please let me know as this is my first attempt at solar.

• If you want to make your own eco tool yourself just look for Inplix website. There is all you need to make it :)

• it's what you class as sun, panels still work on cloudy days just not as well. our house uses half a KW per hour with everything in the background so phone chargers, a couple of laptops, routers, fridges, freezers etc.its our first year of grid solar and the hard part is not exporting anything as most is generated during the afternoon but its still worth doing so far, I'd like to add more panels to catch the evening sun as winter time is produces next to nothing so off grid not an option without a second source of power. you can fit switches to go back on grid when your bank goes flat. some have built set ups to use economy 7 to charge a bank at night buts its only effective if you have it already I reckon.the ideal off grid solution is to drive an electric car, charge it at work for free then run the house off it at night :)

years ago I worked out that you could go off grid if you created a massive bank and ran your house like a submarine. that was before solar really kicked in.as I understand it as I am currently tied to the grid then to go off it in event of a zombie plague for example then at its simplest I would need to recreate 240v to power the inverter first so it can then use the power I generate through my 3.5kw array to charge batteries or run appliances. in theory a simple car inverter and battery would do it.one thing I have noticed is that most inverters do not generate power until the panel voltage goes above 150v so you have a chunk of lost voltage going spare on cloudy days which could be run through a battery bank if you set one up as a voltage buffer. there's a lot of spare voltage we brits are unable to use. I did wonder if a US 110v inverter could be set up to use this lost power.

• WaqasA45 followed DIY Solar Jon2 months ago
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• I got a Sovonics MA-33, the largest solar panel, puts out 33 watts/2.15 amps of 12-volt DC from freinds who have sold their boat . Bought an inverter , a 12v battery ( for lawn mowers and a solar charge controller ( max 7A overcharge 14V=0.5V) but have NOT one clue how to put it all together. Help! If youcan please. I want it to be able to run a submersible pump in my second well to water the gardens .

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• Sir's, If my battery power bank is 48v output and my pure sinewave inverter output is 220v...from which output do l am going to use as voltage draw? Is it from the inverter voltage output or from the battery bank voltage output? Ex. 1800watt-hr/220v(inverter side) or 1800watt-hr/48v(battery side) to get my amp/hr.

• This is talking about off-grid living.

• I did the math and I either need forty seven thousand batteries and two panels or vice versa. Is that right?

• Those who are interested in a convenient step by step filmed guide, visit: http://www.energybilldown.com/diy-home-alternative-energy-solar-system/ - DoItYolo

Actually, you save money by being fully off grid too, because you no longer have a power bill ever again. Once your equipment is paid for, power is free, and if the grid goes down, yours still works because you have a complete stand alone power grid, unlike grid tie. "I personally have nor researched Ni-Fi, but it last 100 years then why is every phone and toy not using them."The batteries are not sealed, and they are heavy. You have to add water every month, and they are around 1.2 to 1.5 volts each, so you need 10 of them just to make a 12 volt battery. If you will research them, you will find a certain company bought the original tech back in the day and sat on it. The batteries can last 100 years, and it's been proven some already have. "I personally have a 3kw hybrid System, i can fee the grid and save money, but when the power goes out i have 4 x 105ah deep cycel batteried to run the lighting and a couple of things."Well that is great, but most grid tied users don't have a battery bank, or a safe way to isolate their battery bank from the grid. Another problem people run into is trying to get the power company not to make you take power at peak rate times, and sell it at off peak times, which greatly makes a difference on how much money you actually make or save. At 3Kw, it just sounds like you are saving a few bucks, and I understand if you have more power than you need, or if you need more power hook into the grid. I just think without an isolated battery bank it doesn't make a whole lot of sense, since if the Power Company's grid goes down, so does yours without the bank. The reason I say just completely divorce yourself from the grid is, I have personally caught multiple power companies completely ripping me off over the years. One time I was in the NG, and was gone 15 days that month. My power bill tripled that month, even though instead it should of been a fraction of the month before, and that's just one example.Another thing of concern is the radiation from the ZigBee transmitters on the smart meters, and the spying on us. - Full Spectrum Survivalist

Full spectrum i am with SteveD113 on this, but the sysytem greatly depends on your needs, saving money or bing free of utility companies. I personally have nor researched Ni-Fi, but it last 100 years then why is every phone and toy not using them. I personally have a 3kw hybrid System, i can fee the grid and save money, but when the power goes out i have 4 x 105ah deep cycel batteried to run the lighting and a couple of things. - JohnyF2

• The 3 does not indicate the 50% depth of discharge as you say.It represents your estimated number of days of power use, without the system being recharged by the sun. This example is over a 3 day period of cloudy weather, you may wish to change that to 4 days or 5 days etc. The number 2 is what you would multiply with to represent the 50% discharge. Hope this helps.

• 12V is OK for small installations like campers and RVs, but I wouldn't use it for a system like this because of the huge currents and massive wire needed. His inverter is 2500 watts, and with 12V, I think that would need 4/0 cable. He's going to have over 200A going into the inverter at times, which is dangerous in a DIY system in my opinion. He could have 1/4 of that with 48V. Grid tie can eliminate the whole bill, not just a little. Well, I need to qualify that; they do charge \$10 a month for the privilege of using the grid, but I don't mind that too much because they are, in effect, providing me with a huge unlimited battery that I never need to maintain. - SteveD113

• That junky install makes me glad I am not one of his neighbors. The fact that his system is 12V should tell you something. "So you think buying a generator that takes fuel and maint cost is a better solution than buying NiFi batteries once that don't take fuel, lol."Yes

I just read an article where he says ""...And I was having trouble because I wanted to vacuum but there were no sunny days. I can't run my vacuum if I want to have power in the evening."So he's having to carefully conserve so much that it has changed his lifestyle. Meanwhile, with my grid tie system, I'm able to run the A/C, hairdriers, TVs, anything I want, and still spend no money for power. Looking at his roof, my system is about 1/3 of his size, physically. There is one difference: If the power goes out, I have no power, but he does. To me, having all the power I want, when I need it, for free, I can suffer through an outage once or twice a year. So even if he didn't have any battery cost whatsoever, I would never advise anyone to do what he did, unless they are just really into it. For him, it's a hobby, a labor of love, and all that. That's great for him, but it's not what most people are in this for, they just want to save money or get off the grid without understanding the ramifications. Even if there WAS a ROI, you'd have to value your time at zero to realize that.