@Chris Hobson, the DOD settings on the Imeon app manager. By default set to 40% with grid and 85% without grid. Does this mean it will for instance discharge 40% and leave 60% capacity or visa versa? Can you or someone else maybe give me clarity on this ? My French is not so good ...Lol..

Thanks guys , figured it out. It's late and time to go to bed I think.

On 1/17/2017 at 9:23 PM, Chris Rossouw said:

Just a quick feedback on the first full day of trading on the Imeon. Since yesterday 14h00 when we connected the grid I have not used a single unit from Centlec, I am actually in credit with 2 units. This morning my first 140w was generated at 05h52 and at 18h22 tonight she was still going at about 400w. Herewith a screenshot at about 17h00. I noticed that the batteries does not charge higher than 54.4v per bank. Is this normal. I checked all the batteries separately, all of them exactly the same except for one being .1v less than the rest .

 

As for the spike in the panel voltage. I checked the speck sheet of the Canadian Solar panels. It specifically states the variance per /C lower or higher than a certain C value. It differs between different suppliers but is always shown on the spec sheet. Anybody can thus calculate according to his brand and the area he/she stays. One should therefore use the lowest possible temperature for that area and do the calculation accordingly.

This only happens for a split second period during the very first sunrays in the morning. I spoke to a guy in Cape Town this afternoon, who did his doctors degree in solar energy, and he explained the scenario to me. I asked him to do a short write-up for the forum on this aspect and will post it in due time.

 

Chris I put some temperature sensors on my roof, one next to the solar panels and one directly below one of the panels, in order to measure the temperatures on the roof. This is actually part of some research I'm doing in summer, but will check the temps on my roof in the winter as well.

I want to propose, would it be possible for you to do the same?

I'm quite curious about many of the claims many manufacturers make - in my case, I brought some roof paint which claims 30% solar reflection, so it should be cooler inside. In your case, with the colder weather in Bloem, it would be great to see how your panels perform, and if the Voltage do inded spike up to the level you said. Looking at the spec sheet, you should see a spike of 42Volt @ -7 degrees Celsius. I'm curious to know if it does indeed spike that much?

On ‎2017‎/‎01‎/‎28 at 10:13 PM, SilverNodashi said:

Chris I put some temperature sensors on my roof, one next to the solar panels and one directly below one of the panels, in order to measure the temperatures on the roof. This is actually part of some research I'm doing in summer, but will check the temps on my roof in the winter as well.

I want to propose, would it be possible for you to do the same?

I'm quite curious about many of the claims many manufacturers make - in my case, I brought some roof paint which claims 30% solar reflection, so it should be cooler inside. In your case, with the colder weather in Bloem, it would be great to see how your panels perform, and if the Voltage do inded spike up to the level you said. Looking at the spec sheet, you should see a spike of 42Volt @ -7 degrees Celsius. I'm curious to know if it does indeed spike that much?

Indeed I will Silvernodashi. I just won't be able to do it immediately, but towards he end of Feb I should be able to have it up and running. I use to have a drying tunnel for figs and implemented 2 temp sensors to control the fans and heaters. I'll have to adapt the program a little and get the readings in a dbase, but shouldn't be a problem. We are just very busy at the moment, but as I said, towards the end of Feb is going o be ok! Our hottest month is Feb and coldest usually mid Jule to mid August. ( If the weather patterns doesn't change agaim. ( Lol ..!!)

 

5 minutes ago, Chris Rossouw said:

Indeed I will Silvernodashi. I just won't be able to do it immediately, but towards he end of Feb I should be able to have it up and running. I use to have a drying tunnel for figs and implemented 2 temp sensors to control the fans and heaters. I'll have to adapt the program a little and get the readings in a dbase, but shouldn't be a problem. We are just very busy at the moment, but as I said, towards the end of Feb is going o be ok! Our hottest month is Feb and coldest usually mid Jule to mid August. ( If the weather patterns doesn't change agaim. ( Lol ..!!)

 

which temp sensors do you have? I use a Raspberry pi to log DS18B20 temp sensors to emoncms.org. The code is very simple and I can send it to you if you want?

4 minutes ago, SilverNodashi said:

which temp sensors do you have? I use a Raspberry pi to log DS18B20 temp sensors to emoncms.org. The code is very simple and I can send it to you if you want?

Will talk to you when I get to it , Thanks

On 1/17/2017 at 9:23 PM, Chris-R said:

Just a quick feedback on the first full day of trading on the Imeon. Since yesterday 14h00 when we connected the grid I have not used a single unit from Centlec, I am actually in credit with 2 units. This morning my first 140w was generated at 05h52 and at 18h22 tonight she was still going at about 400w. Herewith a screenshot at about 17h00. I noticed that the batteries does not charge higher than 54.4v per bank. Is this normal. I checked all the batteries separately, all of them exactly the same except for one being .1v less than the rest .

 

As for the spike in the panel voltage. I checked the speck sheet of the Canadian Solar panels. It specifically states the variance per /C lower or higher than a certain C value. It differs between different suppliers but is always shown on the spec sheet. Anybody can thus calculate according to his brand and the area he/she stays. One should therefore use the lowest possible temperature for that area and do the calculation accordingly.

This only happens for a split second period during the very first sunrays in the morning. I spoke to a guy in Cape Town this afternoon, who did his doctors degree in solar energy, and he explained the scenario to me. I asked him to do a short write-up for the forum on this aspect and will post it in due time.

 

Chris, would you mind pointing to me to the exact wording / phrasing on the specsheet which indicates the variance per /C, lower or higher than a certain C value? I have looked at the specsheets but cannot find what you are referring to.