EEVblog #724 - Home Solar Power System Analysis & Update
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Dave looks at his 3kW home solar power system after being in operation for 18 months and analyses the results. Original video: https://www.youtube.com/watch?v=VGENVguQQmo Timelapse install video: https://www.youtube.com/watch?v=fQAd7nposJQ How much energy was produced? How does net and gross metering work? What is the payback period? What is solar insolation? The 3kW system uses 12 x 250W LG MonoX panels http://www.solarclarity.nl/wp-content/uploads/2011/09/Data-Sheet-LG-Mono-and-Multi-X-ENG.pdf and an SMA Sunnyboy 3000TL inverter. http://files.sma.de/dl/15330/SB5000TL-21-DAU131211W.pdf Uploading data to PVoutput.org using PVbeancounter and bluetooth from the Sunnyboy inverter. PVoutput data: http://pvoutput.org/list.jsp?sid=20402 Forum: http://www.eevblog.com/forum/blog/eevblog-724-home-solar-power-system-analysis-update/msg630168/#msg630168 EEVblog Main Web Site: http://www.eevblog.com The 2nd EEVblog Channel: http://www.youtube.com/EEVblog2 Support the EEVblog through Patreon! http://www.patreon.com/eevblog EEVblog Amazon Store (Dave gets a cut): http://astore.amazon.com/eevblogstore-20 Donations: http://www.eevblog.com/donations/ Projects: http://www.eevblog.com/projects/ Electronics Info Wiki: http://www.eevblog.com/wiki/
Comments
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You should install ultracapacitors between solar panels and the inverter/controller, you will see the energy log curve dips/drops/changes get fixed & will give you more energy by compensating for low light conditions of morning and evening everyday. 500F banks of maxwell caps. in parallel & series would do it.
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roughly half of what we pay here in the USA in NC... in a newer energy efficient house with energystar appliances.... 5000 bucks actually sounds cheap to me, totally worth it if you ask me.
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have you been looking into energy storage systems? with the expansion of lithium battery tech prices have been falling
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how did you mount on clay tiles?
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In California (for NEM 1.0), they only pay you spot rate wholesale for your surplus generation (which is 2.7 cents/kWh this month), but your net total is a 12 month running tabulation. Doesn't matter if you consumed at night...if you made more in the day, then you are credited with positive surplus. Made 3MWh extra last year which pretty much paid for the $10/mo hookup min payment fee. Some people choose to pay the $120/yr and not even sell anything back...better used to charge EV's and run the a/c like rockstars.
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Does the solar powered system continue to provide electricity to the house when the electrical grid goes down during daylight hours?
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bro, why dont you have batteries?
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Wait a minute, you solar generated 7.5 MWh, gave 5 to the grid. That leaves 7.5-5= 2.5 of it that you used in your house. You also used 6.7 from the grid. That means your total use was 6.7+2.5=9.2. But again you only solar generated 7.5, so no, even with a perfect storage system, you would not be energy independent. you need an extra 25 ish percent increase in your solar power generation amount.
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Nice!
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what are those vertical rotating things on the roof ? sorry noob here
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fall arrest any one : P ?
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Nice video! Thanks for sharing. Concerning the amount of energy used by your home, is the total amount of energy used equal to (meter 1 - meter 2 + solar meter)? This would be (6.7 - 5.0 + 7.4 = 9.1MWh)
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I know this is EEVblog, but have you done an ROI on solar hot water?
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At 9:08 is that a natural gas hot water storage heater behind you? If it is then change it to an instant system like Rinnai Infinity 26. It's a little white box that is attached to the side of the house. The only time you use natural gas is when you turn a hot tap on. I've got three control pads inside my house in the kitchen, bathroom and laundry where I can dial the temperature to my desire. There is no hot water storage so no need for gas to be constantly used to keep the water hot. I have gas for cooking, heating and hot water.
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just a quick question I google the 3 kw grid you speak of the LG pannels and the cost was 7.5k USD I think just for panels. Are in australia different rates for this panels? I'm confused how you were able to install everything in 5k budget
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suppose if you were to deploy strings of battery bank where they'll be charged during the daytime and be used at night, can that make you totally off the power grid?
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hi boss, how to install a grid tie inverter on a prepaid meter always pay despite gets electricity from us
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Thanks, great report. I'm installing a 4.48KW system - fourteen 320 watt LG panels and Enphase microinverters. I'm in California, USA. Our federal government gives a 30% rebate. Dont feel bad about 0.06/KWh, Southern California Edison is paying about $0.045 per kWh. I'm serviced by Los Angeles Dept of Water and Power who also uses net metering and expect similar payment. About cleaning panels, it doesn't rain here anymore :<), and efficiency will drop if no cleaning. For safety sake, I believe (1) Clean only at night - (2) Disconnect system from the grid, (3) Lather panels with foamy soap (4) Rinse them down, (5) Squegee them dry.... for single inverter systems, power that unit down if it is grid powered. ...Your thoughts?
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the numbers are screaming for a tesla power cell
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nice to see your wearing safety thongs, twit
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