Jump to content
Richard Mackay

Geyser load control on RE system

Recommended Posts

12 hours ago, JaseZA said:

I have an Axpert VMiii - doesn't give me any info on available power unfortunately. Will keep testing my PV voltage program and see how it goes...

Hey we use a free plattform called PVControl+

In this video you can see how to divert de solar production when it is possible. In this sample, we have a pair of Sunny Boy and one Sunny Islad.

When energy is enouh, it is used to feed 4 heaters, you can see SSR relays moving.

https://www.youtube.com/watch?v=gwMpXHW_JNg&feature=emb_title

Share this post


Link to post
Share on other sites
15 hours ago, JaseZA said:

I have an Axpert VMiii - doesn't give me any info on available power unfortunately. Will keep testing my PV voltage program and see how it goes...

Fine. The PV voltage will provide an indication of solar power available but it will also drop when the inverter provides power to a heavy load..

Share this post


Link to post
Share on other sites
On 2020/04/13 at 10:45 PM, JaseZA said:

I have an Axpert VMiii - doesn't give me any info on available power unfortunately. Will keep testing my PV voltage program and see how it goes...

An idea i had in the dead of night is to perhaps use a separate PV panel for sun intensity measurement. (It can be a small one)

This will provide an indication of sun power available that won't fluctuate depending on the load on the inverter. Less headaches on how to do the control!

Share this post


Link to post
Share on other sites

Used a Arduino with a light sensor to control the switching of water pump . Cant that be used to determine the amount of light  available .

Share this post


Link to post
Share on other sites

A point about getting maximum power out of a PV system was made by someone on another forum:

If this was a grid-tie system the solar would always produce maximum power. Some would go to the demand load and what is left over would be fed back into the grid. Weather this is wasted or saves you depends on your meter and the local laws.

Share this post


Link to post
Share on other sites
9 hours ago, Richard Mackay said:

An idea i had in the dead of night is to perhaps use a separate PV panel for sun intensity measurement. (It can be a small one)

This will provide an indication of sun power available that won't fluctuate depending on the load on the inverter. Less headaches on how to do the control!

I have also thought of something very similar: You have a small solar panel, say 5 to 10watts. Connect it to a resistor to match its maximum power point. The power % produced will be in proportional to what your solar PV can output. Then take that voltage from the panel, scale it through a resistor network, and use that voltage on a raspberry pi or arduino or whatever microcontroller. I haven't tried it (yet). What do you guys think? Maybe have a solar panel much smaller like  a 1 watt if that is available to reduce the size of the resistor. The reason for the resistor is to get wattage out of the panel as I think that the voltage could not be an accurate measurement of actually available pv power (could be wrong). 

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


Topics

Contact Us - Power Forum South Africa

×
×
  • Create New...