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electrical:solar:status [2019/07/13 17:49]
frater_secessus [Is my solar working?]
electrical:solar:status [2019/09/24 11:39] (current)
frater_secessus [Is my solar working?]
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 ====== Is my solar working? ====== ====== Is my solar working? ======
 +
 +Note:  for simplicity'​s sake this article assumes [[electrical:​nominal|nominal]] 12v [[electrical:​solar:​panels|panels]] and 12v [[electrical:​12v:​intro|house power]].
 +
  
 It is common for those with new solar configurations to worry about whether or not they are working. ​ The worry is understandable because:  ​ It is common for those with new solar configurations to worry about whether or not they are working. ​ The worry is understandable because:  ​
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-This page is to help solar beginners tell what their system is doing without special equipment.  ​+This page is to help solar beginners tell what their system is doing without special equipment.  ​The info here is oriented to typical 12v systems with lead-acid battery banks. ​ Folks running other battery chemistries or nominal voltages are assumed to already know what they'​re doing. ​ :-)
  
 ===== numbers rather than icons or lights ===== ===== numbers rather than icons or lights =====
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 **During bulk charging with MPPT** **During bulk charging with MPPT**
-  * Vpanel == Vmp+  * Vpanel == Vmp((although [[electrical:​solar:​output|temperature derating]] will cause Vmp to drop))
   * Vbatt climbing toward Vabs   * Vbatt climbing toward Vabs
-  * Current delivered to battery holds steady+  * Current delivered to battery holds steady((assuming sunlight holds steady))
   * **Example:​** ​ Panel voltage at Vmp == 17v, battery voltage 12.9v and rising, controller output steady at 4A.   * **Example:​** ​ Panel voltage at Vmp == 17v, battery voltage 12.9v and rising, controller output steady at 4A.
  
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 When **adding loads to PWM during absorption (or float)** When **adding loads to PWM during absorption (or float)**
   * Vpanel & Vbatt held at Vabs (or Vfloat) if possible((by reducing the OFF timeslices in the PWM circuit, perhaps until the panel and battery are 100% connected at full output))   * Vpanel & Vbatt held at Vabs (or Vfloat) if possible((by reducing the OFF timeslices in the PWM circuit, perhaps until the panel and battery are 100% connected at full output))
-  * If enough power is available no change will be observed but the controller may run cooler+  * If enough power is available no change will be observed but the controller may run cooler((as PWM switching reduces in frequency.))
   * If demand outstrips supply the Vbattery & Vpanel will drop((causing a bit of a "death spiral",​ as PWM produces less power as panel voltage drops))   * If demand outstrips supply the Vbattery & Vpanel will drop((causing a bit of a "death spiral",​ as PWM produces less power as panel voltage drops))
   * **Example**: ​ Upon adding load, the controller releases power it had been dissipating in the PWM circuit. ​ Current output spikes to meet load demand.((this is reflected in either battery charging amps or load amps depending on how the loads are wired)) ​ Output is limited to whatever power the panel puts out at Vabs & Vfloat.((almost certainly less than what the panel could put out at Vmp))   * **Example**: ​ Upon adding load, the controller releases power it had been dissipating in the PWM circuit. ​ Current output spikes to meet load demand.((this is reflected in either battery charging amps or load amps depending on how the loads are wired)) ​ Output is limited to whatever power the panel puts out at Vabs & Vfloat.((almost certainly less than what the panel could put out at Vmp))
electrical/solar/status.1563065346.txt.gz ยท Last modified: 2019/07/13 17:49 by frater_secessus