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- Опубликовано: 15 авг 2021
- ** Programming Electronics Academy **
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In this video:
* A quick chat about my family vacation / road trip to Lake Tahoe.
* A big thanks to Dino for the air capacitor that has fixed my HP3561A.
* A chat about the buying process and mounting of the solar panels on my
solar power carport.
* A chat about interconnecting the Seplos battery packs.
#ElectronicsCreators
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Music clip from RUclips Music Library - Phase Three by Huma-Huma
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Наука
Good that you went on vacation with the family, and enjoyed yourself as well.
Glad we could find the right capacitor to repair your signal analyzer! 73 - Dino KLØS
Good man!
Cheers from Concord, NC!
UH OH... Daughter learning to drive!!!! hehe
That was great to go on a long cross country trip with your family in a trailer.
Hoteling it is so expensive and you don't get to see much of the outdoors. Something my family did every summer and it is usually a great overall experience.
Glad you got your 5362 going.
After your video, I went out and bought one off ebay. Works nice and I installed the LCD upgrade.
The CRT phosphor was burned on mine with the horizontal and right vertical menus, plus the LCD is a little more colorful.
Glad you went away from RUclips.... you got to travel and relax!
WOW did I mess that up! It SHOULD be 3561! How did I come up with that number?????
The next time you come out here to the West Coast try to get to Crater Lake here in Oregon. Magnificent!
thanks for all the great videos
“I wanted my 15 year old daughter to see what Las Vegas is all about,” said no sane parent, ever!
Martin it's great to see another video - Thank you! Seems like RUclips is ignoring your channel, I have not received any notifications for many months :(
same here it has been a very long time since I got a notice
@@MrLandphill It's really sad to see what YT has become. The focus seems to be crap like licking toads and stupid pranks. Quality content like Martin and others provide appears not to get recommended. SMH
@@CDN_Torsten have to do our part by checking in once in a while I guess. Pretty lousy considering the tech at play.
@@CDN_Torsten Martin's next video is "Using my new 40A solar array to fry toads!"
RUclips bots will love it. :)
John,
There is really no issue with the open circuit voltage limitation on the inverter. The solution is very simple and would be a great project for a video. With four panels in series your open circuit voltage is going to be 166.68 volts based on the specks you showed in the video. While the open circuit voltage is too high for the inverters input speck of 145V by about 21 volts the normal MPPT operating point of 136.6 V is not. Solar panels are current sources so under load the output voltage drop quite quickly to the MPTT point. The issue comes in when the inverter stops drawing load from the panels and the voltage rises to the open circuit value.
The solution is to add a shunt regulator (current sink) across the panel string output leads. The regulator is set to a threshold of say 143 Volts. If the panel voltage ever reaches 143 volts the regulator starts to draw current and limits the lead voltage to 143 V. In normal operation when the inverter is drawing current from the panels the shunt regulator is inactive because the panel string will be below 143V. I had to build one on my solar powered gate controller, its a very simple circuit The circuit I used was based on a TL 431 Precision Programmable Reference with a PNP power transistor and optional load dissipation resistor. My load was low enough I just use the transistor to dump the current to heat.
The first step is to connect 4 panels in series and do some tests to see how much current it takes to drop the open circuit voltage to below the 145 V, that will size your design. The absolute maximum current you would have to dump would be 18A but in reality its much much less. But you don't need to make one large one you could build a number of smaller ones to be used on each panel. The nice thing, they are all self powered by the panel. I can send you my circuit circuit if you want.
Think of it this way: Add a 143V big ass power zener diode across inverter input.
Craig
Can also have a series voltage limiter, really a special kind of LDO. Another idea would be a dump load controlled using a hysteresis control to do a crude form of PWM.
@@NiHaoMike64
Mike,
A serial LDO was my first thought, however the voltages and current are high enough to virtually eliminate an off the shelf IC. Further any series pass element is going to dissipate some power in normal operation, not what you want for best efficiency. A series pass element may also screw up the MPTT algorithm in the charger/inverter. The shunt solution waists zero power in normal operation because the PV array's output voltage (the MPTT voltage point) is well below the shunt regulator's set point. Thus the shunt regulator never becomes active as long as the charger/inverter is using current from the array. The shunt regulator is only active if the charger/inverter is not accepting any current from the array in which case you don't care if you are wasting power. Remember the charger/inverte's MPTT hardware will adjust the current load on the array to achieve the array's MPTT voltage. If the array is at the open circuit voltage it means the charger/inverter is not using any PV array current. You have to keep in mind that PV arrays are current sources and not voltage sources.
And watch out if the temperature drops and the panel voltage rises.
good question, Yes I did view mounting to Wood, is nice for your review of that. So how to mount Solar Panels to generally Float.
Thanks
Are you going to use the inverter output to feed a 240volt charger for the leaf? If so, show as much detail as possible. Thanks