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--- electrical:solar:rationing [2017/11/19 20:04]
frater_secessus [unusual conditions]
+++ electrical:solar:rationing [2019/09/28 17:11]
frater_secessus [Rationing solar power]
@@ Line 1: / Line 1: @@
+[[lifestyle:words_of_wisdom|Words of Wisdom]]: It is **cheaper and easier to use less power** than it is to make more power. -- highdesertranger((paraphrased))
 ====== Rationing solar power ======
-Sometimes normal awareness is not enough to keep a solar setup functioning with usable power.  In these situations one might need to take steps to minimize loads and maximize power intake.
+Sometimes normal awareness is not enough to keep a solar setup functioning with usable power.  In these situations one might need to take steps to minimize loads and maximize power generation.
+Here are some examples:
+  * a stretch of rainy days
+  * a forest campsite with no good access to sunlight
+  * smoke from forest fires
+  * very short winter days
+  * micro solar installations
@@ Line 18: / Line 33: @@
     * size the inverter to meet the needs of your biggest loads.  Oversizing wastes power because bigger inverters have more parasitic draw.  It may be worthwhile to have a small inverter for small loads and a big inverter for big loads;  this stops the inefficient use of small loads on a big inverter.
     * use MSW unless your intended uses need PSW;  MSW have lower parasitic draws.
-  * open your refrigerator as little as possible after sundown
+  * open your [[food:refrigeration|refrigerator]] as little as possible after sundown
   * [[food:cooking|cook]] with propane instead of electricty
@@ Line 26: / Line 41: @@
 ===== maximizing solar harvest =====
-  * ensure the panels are not shaded by natural obstructions:  move out from under trees, overhangs, etc.
+  * ensure the panels are not shaded by //natural// obstructions:  move out from under trees, overhangs, etc.
-  * ensure the panels are not shaded by obstructions on your own RV:  antennas, A/C units, vents, etc. One way to minimize shading is to park so that the **greatest expanse of panel is facing south** and any obstructions are on the north side of the van.
+  * ensure the panels are not shaded by //manmade// obstructions on your own RV:  antennas, A/C units, vents, etc. One way to minimize shading is to park so that the **greatest expanse of panel is facing south** and any obstructions are on the north side of the van.
   * tilt panels if possible
   * ensure no tarps, awnings or other obstructions are preventing cooling breezes from passing under/over the panels;  panel output drops as cell temperature rises.
   * framed panels (mono and poly) should be mounted with some space underneath them for cooling airflow.  Cell temperature affects panel voltage output.
   * clean the solar panels.  Dust or dirt on the panels can decrease panel output by 5-10% in some cases.((http://www.lwd.com/solar/deratingfactors.htm))
+  * [[electrical:solar:pwm_tweaking|tweak your PWM controller]] to produce more power, and be //ruthless// about not running loads until the battery bank is out of bulk mode.
+  * invest in [[electrical:solar:charge_controller#mppt|an mppt controller]] if you can, and [[electrical:solar:charge_controller_setpoints|configure it]] to battery manufacturer specifications
+  * install [[electrical:12v:alternator|an isolator]] for alternator charging
+  * use [[electrical:shore_power|shore power]] charging (via [[electrical:converter|converter]]) anytime it is available

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