User Tools
electrical:solar:overpaneling
Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
|
electrical:solar:overpaneling [2018/07/20 16:23] frater_secessus [how MPPT controllers clip power] |
electrical:solar:overpaneling [2018/11/15 16:02] frater_secessus [MPPT and heat] |
||
|---|---|---|---|
| Line 39: | Line 39: | ||
| - when there is very little load being used | - when there is very little load being used | ||
| - | This occurs because the PPT controller moves Vpanel toward Voc to reduce current when less is needed but battery voltage is high, as in late Absorption . | + | This occurs because the PPT controller moves Vpanel toward Voc to reduce current when less is needed but battery voltage is high, as in late Absorption. |
| Line 82: | Line 82: | ||
| The heavy vertical black line((also added by secessus)) comes down from that intersection at 21v.((It also crosses at ~11v but most MPPT downconvert rather than boost, so 11v is not useful.)) | The heavy vertical black line((also added by secessus)) comes down from that intersection at 21v.((It also crosses at ~11v but most MPPT downconvert rather than boost, so 11v is not useful.)) | ||
| - | In this case the controller wants to limit panel output to 65w So it runs the panel at 21v, which is a far cry from Vmp. Then it downconverts the excess voltage to amps: it charges the battery((or runs loads)) 5A @ 13v.((this | + | In this case the controller wants to limit panel output to 65w So it runs the panel at 21v, which is a far cry from Vmp. Then it downconverts the excess voltage to amps: it charges the battery((or runs loads)) 5A @ 13v. |
| === corollaries === | === corollaries === | ||
| If you have the curve and Vpanel you can derive the power output. \\ | If you have the curve and Vpanel you can derive the power output. \\ | ||
| If you have the curve and you know Wpanel you can derive Vpanel. \\ | If you have the curve and you know Wpanel you can derive Vpanel. \\ | ||
| - | If you have a lot of time and patience, you can plot Vpanel and Wpanel to draw the curve yourself. | + | If you have a lot of time and patience, you can plot Vpanel and Wpanel to draw the curve yourself. |
| - | + | An MPPT controller is //always// **T**racking and using powerpoints, | |
| ===== vs. battery bank ===== | ===== vs. battery bank ===== | ||
electrical/solar/overpaneling.txt · Last modified: 2023/11/22 10:31 by frater_secessus
Page Tools
Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Noncommercial-Share Alike 4.0 International
