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DIY Solar – Episode 8 – Sun Grid Tie Inverter + Safety Devices (…

DIY Solar - Episode 8 - Sun Grid Tie Inverter + Safety Devices (...



In this episode, I talk about the Sun Grid Tie Inverter with Limiter. I talk about the different options for setting this device up and also share a wiring diagram for how I installed several safety components to protect the equipment and my home.

Here is a list of the items used in this configuration along with the source for the items:

See screen shots in video for wiring diagrams.

Input (Solar) Side

Quick Disconnect (Home Depot)
Model: HNF60R
Halex 60-AMP 120/240-Volt Non-Fuse Metallic AC Disconnect

Distribution Box (AliExpress)
2 - 4 ways Plastic distribution box for circuit breaker indoor on the wall

Breaker (AliExpress)
Model: TOB1Z-63 DC 20A
2P 20A DC 440V Direct Current Circuit breaker MCB C curve

DC Surge Protection Device (AliExpress)
Model: TZG40-C
SPD DC 600V 20KA~40KA House Surge Protector Protective Low-voltage Arrester Device

Output (AC) Side

Distribution Box (AliExpress)
9 - 12 ways Plastic distribution box for circuit breaker indoor on the...

source

List your electronic components at BuySellComponents.com

Tags: solar components

About the Author

30 Comments

  1. Date: April 15, 2018 at 23:13
    Author: david maryan

    Hi I don't think you should be grounding the DC surge protector to the house earth I think you need a separate DC earth rod at least 20ft away from any ac earth rod

  2. Date: April 16, 2018 at 00:07
    Author: William Pysell

    Thank you for your very informative new video about off-grid power systems.

  3. Date: April 16, 2018 at 05:28
    Author: Bostjan Trancar

    Cos is something with inductive load's probably…resistors have cos=1. Inductive load's have less than that up to 0.99 you can improve this with some capacitors
    Cos is on the every single phase motor as value so that you can add capacitors to improve that factors up near 1 so less inductive current in the wireless less heated wires…something like that… ?

  4. Date: April 17, 2018 at 01:19
    Author: Alphonse Ogulla

    A quick suggestion on the solar input wiring diagram (Minute 15:32). The DC Surge Protection Device or SPD should be fed from the 20A circuit breaker output. This is because Metal Oxide Varistors (MOVs) inside SPDs can develop short-circuits after arresting voltage spikes and transients. Should the 600VDC SPD short-circuit then the 20A breaker will trip to protect connected PV panels (i.e. if they can produce sufficient short-circuit current to trip the Curve C breaker). The SPD on the AC output side is wired correctly.

  5. Date: April 19, 2018 at 01:48
    Author: Cory Grimm

    Are you being overly precautious with the negative fusing and breakers?

  6. Date: April 19, 2018 at 16:39
    Author: Jack Braoun

    Hi, you mention (7:00) that the electrical outlet has a 15 amp breaker and if someone is using a hair dryer and the grid tie inverter is also using the same wiring it would overload the wiring-circuit breaker. But my logic dictates that the hair dryer (1500w) is causing a voltage drop and the grid tie inverter is creating a voltage rise so that would mean the gti at full power is feeding two thirds of the power the hair dryer needs, basically unloading the load on the circuit breaker.
    Q. The gti will be sensing a 500w incoming signal for as long as the hair dryer is on say 2 minutes. When the hair dryer is switched off will the gti continue feeding the grid for another minute if at full power?
    If so, then it will be spining the meter backwards, (resetting the meter) basically you are then using the grid as a perfect battery…
    Am I making any sense?

  7. Date: April 19, 2018 at 17:23
    Author: jvalinsky

    Hello again Jim. Pardon my ignorance but I have a question regarding the 2000w 240AC Sun Grid tie Inverter model. You mention it cant be used in the US but we have 240AC through the addition of the two 120AC legs coming into the house. I would like to get the 2000w model over pay for two 1000w version if possible. You obviously know a lot about these units so I was hoping you could tell me/explain the limitation. Thanks again and thanks again for posting these videos and information

  8. Date: May 1, 2018 at 19:19
    Author: Tj Smith

    Be careful what meter you have. Smart meters are the worst for diy solar. Limiting gti are needed. There are 3 types of analog meters. Really Old meters are the best. Both the disk and dials will go backwards. The next one the disk will go backwards but the dial will stay stationary. The last one you will need a limiting gti also. Because the disk will move backwards but the dials will keep moving forward ( basically paying the electric company to take your electric).

  9. Date: May 10, 2018 at 14:15
    Author: todah isreal

    Can you disable the limiter? I'm in Florida and my city doesn't mind the grid tie.

  10. Date: May 26, 2018 at 06:44
    Author: Kev711 2001

    go bucks im from CO down in FL now and about to build my system i have full sun no shade lol i need it just to shade my house

  11. Date: June 20, 2018 at 03:46
    Author: crazy eddy

    Jim this This Ed Nelson please come and visit me I'm work at your local electric company!

  12. Date: July 9, 2018 at 00:45
    Author: Jarek F

    It would be great if this system could also use batteries at night. Could this inverter take power also from batteries (when solar power is down)?

  13. Date: July 19, 2018 at 01:38
    Author: Suren Bono

    … They should actually thank you for producing your own energy.. the coal generators are more expensive and harmfully to the environment… all grid tied system has standardized safety procedure to turn off when the grid goes down to protect those engineers troubleshooting the grid…what u can add is a hybrid inverter…which is connected to battery..and turn on when the power goes down or access solar power are saved on those battery when the grids down …but im not sure yet if it is feeding into the grid…for our power engineers safety they should not…so we need a breaker to grid when the hybrid detects a power-down and turn on its off grid functions… and turn back on when its back automatically ..make lots of buck by saving them in long term investment..

  14. Date: August 6, 2018 at 01:47
    Author: Dave W.

    The power coming into most houses is 2 phase. One phase normally runs the lights and the other phase the wall sockets. 240VAC L1 to L2. 120VAC L1 to ground and 120VAC L2 to ground. You will need two inverters, one per phase. You also need to check if your power meter will not charge you for putting power out to the grid. Most power-smart meters will not run backwards.

  15. Date: August 13, 2018 at 14:45
    Author: IFling Poo

    I have a question I cant seem to find an answer to. I currently have a "professional" solar install using SolarEdge inverter with power optimizers. Its using 22 LG solar panels and works well however, I would like to add some power to my house as we seem to be using more power then we thought, mostly due to the fact we now work from home. I would rather just add a something like this myself to help out but Im curious if it would/could cause an issue with my current system? On one side given that the power company knows we push back to the grid I could just push what we dont use back in addition to what we do during the day (not much and we have a shading issue), but I dont want to push to the inverter and damage it.

    Any help mush appreciated.

  16. Date: September 13, 2018 at 16:50
    Author: foxrace0985

    very informative…I saw one of those grid tie inverters and thought it seemed pretty sketchy to plug right into an outlet.. I like your idea of a completely separate circuit. I wonder if a circuit breaker would blow if something came into the panel with too many amps… normally they blow when pulling to many amps out.. Anyway, great video besides that awful shirt… Go Blue! 😉

  17. Date: September 30, 2018 at 03:49
    Author: Flowers

    I want to copy this system exactly as you've done it. How many PV panels did you use and what were their voltage? I have found some good priced 24 volt 300 watt panels, but I have a feeling that they won't work with your inverter. My other little question was when I install the dedicated circuit breaker, what gauge wire are you using? Are you using a a 20 amp breaker? are the wire gauges is that on the drawings?

  18. Date: October 9, 2018 at 19:01
    Author: Randy Hauck

    Why do you say not to order the 220v version for USA. I would think you could just wire into a dedicated 220 breaker which would feed both legs of the breaker box. The only problem I see is the limiter can only moniter one leg. Solution for this would be to put in a 220v breaker that stays on the same leg

  19. Date: October 19, 2018 at 14:21

    George here…Jim, in your video, you placed an AC SPD in the panel box thru which the 120V AC output of the inverter is passing through. Don't you think it is better to put this AC SPD in the AC line coming in from your electricity supplier (YES-the grid). Any surge coming in from outside … from the grid will be "caught" by this AC SPD … thus protecting your entire distribution circuits in your mains panel board … including your exclusive 120 volt outlet for your inverter output. From the looks of it, you are just protecting your GTIL INVERTER but not your other house appliances – unless, of course, you already have an AC SPD at the entrance of your house main lines.

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