Fruit Trader

6 hours ago, JBChiangRai said:

Did you increase the export to grid figure to 6000w?

 

I think now you have fitted extra panels, it's exporting 2500 watt then there is insufficient local demand in your house for the remaining 3500 watt and it restarts.

The inverter has no idea that there is a potential 3500 watts not being consumed. It is only interested in the real time demand and any limits imposed by settings. A de-rated inverter will happily produce a tiny fraction of what the attached solar array is capable of.

If healthy, the only real problem for an inverter is over/under voltages at either end of its process or excess temperature generated around the switching electronics.

Note. I did not grab this information from the internet black hole, it comes from studying the disassembled code of several on grid solar inverters made by Chinese enthusiasts. 

4 minutes ago, KhunLA said:

Maybe this will help ... IF you went to the petrol station and AND you had access to 2 pumps, one charges you , and one is free, which one would you use ?

Your simple logic and example explains why you are having difficulty understanding. Maybe call a friend for guidance.

3 minutes ago, JBChiangRai said:

Marginal vs. Absorbtion, total opposites but both acceptable accounting principles.

I think you already know my argument is against those who choose to use the word free without being specific. If ROI is more complex than a simple price per unit calculation then it's important to explain how this will speed up payback. Best to keep it simple on forums where not everyone wants to get involved with costing methods.
 

2 minutes ago, JBChiangRai said:

Actually, that depends on the accounting principles applied to that calculation.

We can split hairs and argue with personal circumstances all day long but simple ROI rules will always win. 

On 9/5/2023 at 12:40 PM, KhunLA said:

Only if the solar system is larger than the needs of the house, then added cost would be part of the ROI, toward the EV.

 

Ours is not, as needed during rainy season. At time of contracting solar install, EV wasn't being considered, as we had just bought a new ICEV.  No intension of buying an EV, due to ignorance, and prices of.   2 yrs later, enlightened, upgrade version of, at same price & govt incentive, made it a no brainer for us.

 

So yes, our excess solar produced energy for the EV is .... FREE energy.

 

During rainy season, depending on use, the solar may not even produce enough extra for the EV, if not planning one's charging.  Not a problem for us, Having the E-MB & ebike, so no really need to have use the car.  We can wait.

 

Grid is available if impatient. 

Your personal arrangement, planning, E-bike, ICEV, bla bla bla is totally irrelevant to my argument no matter how you apply the word FREE.

Read and digest it slowly, you will get there in the end. I have placed the important part in bold to make it a little easier for you to catch on.

One cannot claim the power is free (no cost) until the value of electricity produced exceeds the cost of solar equipment. 

38 minutes ago, BenStark said:

I replied to a quote by you that you charge for free through your solar installation, while in fact that installation has cost you hundreds of thousands of baht. So how can that ever be free?

It will become free from cost when initial investment has been recovered. 

Solar power is a great way to charge EV's but one cannot claim the power is free (no cost) until the value of electricity produced exceeds the cost of solar equipment. If a solar system produces more energy than required and surplus energy is used to charge an EV, the same rule applies.

Free can mean many things; so it's best to be more specific unless of course one is purposely attempting to introduce ambiguity just in case someone questions the claim. 

18 minutes ago, eddysacc said:

It shows no fault.

I just resetted the inverter the day before. It might be deleted.

 

Let's wait for a sunny day and check again.

 

 

 

 

If an inverter restarts frequently the first port of call is the fault log. If the logs show no errors then begin looking elsewhere.

In theory software should not make a restart during normal operation without logging the reason but there's always a possibility you have a condition that's not been accounted for or might even be one that's resetting the hardware without the software ever knowing.

The high temperatures you speak of are of interest to me because I have made some mods to my inverters and others that use passive cooling. These mods help during high load and high ambient temperature conditions.

1 hour ago, Yorkshire Tea said:

Rear end is a design disaster, but at least you won't be looking at it ????

It's not so much of a dogs breakfast if viewed from below in good light and I have always liked Ford performance blue. Definitely the budget fix for a midlife crisis.

2 hours ago, retarius said:

The old MGs were British Leyland vehicles which were extremely poorly designed and of excitedly poor quality. The MGC had to be taken off the road because it was a death trap.

I grew up on a small Greek island and know very little about the British car industry. I would however be interested to know why a sports car often observed at our mainland shows was taken off the road because of safety issues. 

Link to the detail would be appreciated.

On 8/31/2023 at 12:35 PM, transam said:

That's great, now get rid of the MG badge and replace it with, perhaps, a plastic rickshaw emblem, which would be more truthful.............

The MG re-badge idea should be more about losing the stigma not making it worse.

This re-badged MG is lipstick on a pig but if it makes the owner feel more confident, why not.

1 hour ago, josephbloggs said:

I think "CH JNK" is supposed to stand for "Chinese Junk" which is an oh so hilarious really poor Photoshop job undoubtedly made by an anti-China racist or rabidly pro-US right winger (same thing really). Definitely done by someone with no independent judgement or first hand experience anyway. Maybe transam himself?

 

The car looks nothing like a Trans Am but it appears you have a knack for cracking these cryptic plates. Lots more over in the Reddit stable if you enjoy the challenge but be aware they play for fun and without racist cards.

This is a tricky one.

27 minutes ago, In the jungle said:

Personalised plates don't come cheap.

Well spotted, the personalised plate will likely to go up in value and offer a little compensation at the very least.

43 minutes ago, eddysacc said:

It also gets very hot although we added a bit fan for active cooling.

What does the fault history show?

I wonder how much crap made it through those holes to the evaporator. If it's not  chewed by a rodent there's something very wrong with that filter. 

33 minutes ago, brianthainess said:

That is not a load applied, just a set speed of the rollers, to turn the wheels. 

The vehicle braking system applies load on the rotating roller motors which is measured and displayed to the operator. 

I believe in some countries heavy goods vehicles include load or down force applied during these tests.  Not sure why this is done, possibly to test suspension or vehicle load sensors during tests.

Mains supply isolation requirement for home automation switching devices is mostly decided by the the relay contacts state. If the contacts are dry (volt free) then good mains isolation at the PCB is desirable.

Example below Shelly with dry contact isolation. The OP has model without dry contacts. 

32 minutes ago, Muhendis said:

It is double insulated according to the triangle with the circle and tick mark inside.

https://www.eess.gov.au/rcm/regulatory-compliance-mark-rcm-general

5 hours ago, OneMoreFarang said:

The Shelly devices will be connected to an electrical switch. But there is no load (in my case). The Shelly devices have a WLAN receiver and that's what I use.

Shelly device with powered electronics only, no relay load.

All brand name devices like Shelly and Sonoff have some kind of internal protection at the electronics supply circuit. Inline fuse, fuseable resistor or similar. 

As already mentioned, very short lengths of 1mm cable will easily carry your breaker trip current although an electrician following his code would likely shout foul.

22 hours ago, jij said:

i've gone thru two sets of seven pool lights. The last batch only lasted two years. They were Emaux low voltage sealed in resin. i feel silly buying the same brand again, but was told by a pool supply owner that they were the best and that they must be sealed in reason.

Thoughts?

Suggestions?

Wise crack comments?

One possible cause of premature failure in LED pool lights. 

A while back my brother-in-law returned home with some failed LED pool lights from a local pool. Thinking about making repairs we dismantled the lights to find that the electronics sealed inside a clear compound has suffered corrosion and burning. Further investigation revealed water had found its way inside of the sealed area down the supply cable.
 
We later made a visit to the installation and found all poolside connections to the lights submersed in water because of pools flood over design.

This service bulletin from Hayward Pool Products points out this problem and the need to seal cable ends at the supply junction. 

https://deltatriluhur.com/wp-content/uploads/2018/09/hayward_underwaterlight_installation_guideline.pdf

5 hours ago, bluejets said:

Digital or not, it is well known the ability to get an accurate reading with a vernier is well nigh impossible, that is why for accuracy a micrometer is used.

Your statement is pointless without defining  accuracy required.

I have just repeated the area measurement method made by @Muhendis (the method you previously questioned) on a 10mm² copper cable using digital vernier caliper which repeated within .03mm. I repeated the test using a 0-25mm micrometer and obtained the same result but the wider contact area of the micrometer  slightly improved repeatability.

6 hours ago, grubman said:

To be honest it doesn't look to be a brand new pickup, the wheels don't look like standard wheels which are on a new Mitsubishi Triton, and the white pickup with black roof is not standard so either its a second hand pick up and new owner, however good to see that no one was injured in the accident, car can be replaced but people can not 

You can buy new fully dream pimped and street cred ready.

2 hours ago, bluejets said:

Just to be difficult, verniers are not all that accurate (micrometer yes, vernier no) and could be enough to throw off your final calculations.

That plus it could be you measured what is known as "compressed " cable or " XLPE" where the conductors are not actually round.

XLPE is an insulation type.

The average accuracy of digital  vernier calipers is around .02mm

20 minutes ago, VocalNeal said:

Why is the EV on the "tow truck"???? Supposed to be the pick up that is undrivable.

Would you get back inside and drive an EV that has just been heavily rear ended.

1 hour ago, 007 RED said:

You've 'hit the nail on the head'.  My small scale GTI system is normally allowed to export any surplus electricity to the grid.  The exception being the day when the meter reader comes, then it's definitely switched into NO EXPORT mode to stop the disc spinning backwards.

I have not done much reading in these threads but interesting to discover a Sofar KTL-G3 series user.

I have some history with this series of Sofar inverters which use passive cooling only. I would be interested to know if your inverter logs 'Temperature De-rating' errors on very hot days. If your inverter is located outside in the shade you probably never see this error.

Along with a few guys in a small group, we also use Sofar KTL-G3 inverters (3.3kW version) one for each phase feeding our work sheds. They are de-rated for no export but rarely does the situation arise where we don't use all solar production.

Only problems we have had with these inverters are over temperature de-rating solved with extra cooling, over grid voltage solved by changing country code and extracting Modbus information from Sofar technical.

Below I show a mod done to all inverters. Electronic controlled cooling fans below the heat sink which includes modified mounting bracket to increase spacing. 

Back to the subject of this thread, how to see the maximum panel output that is possible under the current conditions.

To find potential power output above actual consumption would require a known reference. This might be a small loaded collector mounted next to the main string.