How to calculate dc power Videos

+Sterling Hughs Thanks, I do believe I have the record. Outstanding.

+Sterling Hughs I counted 136 times he said "OK" in his video

+Sterling Hughs 100 times in the first 12 minutes... keep counting. so far averaging 10 times per minute.. about twice every 10 seconds..

+chaseswafford The kill o watt meter is an excellent tool to let you know how much power each appliance is using. Using it will help you add up the watts needed to determine what your power requirements will be.

+Barbara Walthour Thanks for your comments. I don't let bad comments get to me, I just laugh and shake my head. But anyway to view your overall home energy usage, use a TED unit (The Energy Detective). Check the video links for more info. https://www.youtube.com/watch?v=FnHDFHC271Mhttps://www.youtube.com/watch?v=FaHZM7_BEzk

+EcoProfetico Thanks for your comments.

+Droumreague Thanks for your comments, The calculations are just general calculations to give people of an idea of runtime. It's definitely not precise, just general. Thanks.

+Spandau Ballet this stuff is literally impossible.... inverters and chargers are not 100% efficient

+Marclare Jimenez facepalm

Thanks, any recommendation! Tks an advance.

+tony Elkhoury You would need an inverter designed to supply that voltage / frequency.

+kofi ben what is the ratings of bulbs , panels , batteries and inverter used.? type of charge controller and rating? Dc inverter or AC Inverter? Dc lights? please revert with details

Saludo senor Lucas ,Como estas?

+Troy Brownrigg That's a lot of panels, $$$, needed to run 2 AC units and well pump, which should be low power. Yes, to run high energy AC systems, you will need a lot of solar PV panels, not an economical way

From what I've read, UPS batteries aren't a good choice for solar because they aren't meant to be cycled too many times, but if you are getting them for free, that's not much a factor :-)  Good luck with your system.   That sounds like a fun place to work if you can pick through the stuff!

+sdold Thats great info my friend. I appreciate you taking the time to share your knowledge...The gel batteries was more luck than judgment. i'm not sure if they are deep cycle or not. It's a bonus that they don't leak, but as I say its more luck than judgment- I happen to work in a computer\ recycling business and we get UPS units by the pallet load. and I can take as many as my car will carry... hence why i'm battery rich and panel poor !You would think that UPS manufacturers would use the most efficient batteries to provide as much power when needed but obviously they are designed to shunt 240v for a short period so perhaps they cut out at a safe level to protect the cells rather than giving you all they have... some more research required I think!I guess I just need to keep ramping up my panel array bit by bit.. cheers

+TheComputec I'm not really sure about gel type batteries. Those aren't used much in solar because they can't be charged as fast as the AGM or Flooded batteries, because they develop bubbles in the gel. So for those I'm not sure. I think they would be OK because they don't have liquid electrolyte that can stratify. The problem with the liquid electrolyte (flooded) batteries is that they need a charge rate of from C/12 to C/8 (C being the amp-hour capacity). If you go much less than C/12 they will build up lead sulfate crystals at the tops of the plates that will harden and not be removable. AGM batteries are more forgiving and can be charged much slower (and faster, up to around C/4) but are about twice as expensive. So your panel needs to be sized so that the current will be at least C/12. For a 100 AH battery, that's 8.3A, or about 100W from the panel. It takes about a 180-200W "12V" panel with a PWM controller to do that. Maybe you could get by with a little less, but not a lot less.

+sdold Sorry to hijack your conversation, but following on from the response you have just given to +Ramp10er, does this mean that somebody with a cabin and small panels (like myself) cannot simply add more batteries so that they can store a higher capacity charge when for the majority of the time I am not there (ie I might spend only 1 week every 2-3 months) I was hoping that my 160hr bank could benefit from uninterrupted charging from my 60w (2 x 30w) panels while i am absent and then give me enough to run a couple of small items (tv radio and satellite a couple of hours a day for the weeks i am there)... would this also be the case if the batteries were gel batteries from UPS units?  Any info greatly appreciated

+Ramp10er If you are using flooded batteries (the kind with liquid electrolyte), they will never charge the batteries at a rate to prevent stratification and early battery death. They need to be charged at about 1/10 the AH rating. For example 100 AH of batteries needs about 8 amps. The panel you mention gives a tenth of that in the best conditions.

Ok! Thanks for the comment... I'm building one but can not afford with low budget...

That would only work if you had a cabin that you used for one day a week for evening lighting etc and it was charging up all week with no load... even then the maths probably wouldn't work out for a small 10w panel... you could do that with maybe a 25w panel in a setting with good daytime sunlight hours.  You would need to buy a cheap charge controller to make sure that the power going to the batteries cuts off when they are topped up and also to prevent you discharging them too much if you hang too many items off them (easy to forget to switch off a porchlight or a radio for example)  Solar is great but you do need to research what you NEED... how much power you need and how often you need to apply a load to the battery banks 

+The Truth ME TOO!

okayin 4:48 corrected

+Naboulsi Khalid Yeah, on the AC-side (120V) of the inverter ....... Hofpodcast was talking about the battery-side (12V DC). With a 2000 Watt load on the inverter, the wiring on the DC-side has to deal with 166 amps.

ok.sorry i made a mistake i reviewed the video again. and i found my mistake or misunderstanding.

+Naboulsi Khalid Hahahaha,,,I think you are using a broken solar calculator--,,please brother,,,this is a really good video don't mess it up

+Naboulsi Khalid What??? 2000 watts at 12 volts is only 16 amps? That's a miracle!!

+duck featherland Its on my list to do, its just that I have a day job!! This does not really pay much at all... I have some electrical videos in the que from the old house, just have not got them edited yet - too damn busy!Steve

+Stephen Balogh It all depends what you are trying to do. If its a simple backup system, I think a more simple approach is probably all you need. I you want to go off-grid, then more $ invested in electronics may save you more than that in batteries and give you a better performing system.

+Theyspy Theylie Sure, any combination!

+Theyspy Theylie Facebook.com/homepodcast

+MrLeavittScience thanks for the reply, I'll have to try it out.

+snaprollinpitts I would agree with you. No machine is 100% efficient so it would be better to use the output to calculate the more accurate current. Then again I don't have a lot of XP with boosters.