RV and vandwellers wiki

User Tools

Site Tools

Trace:
electrical:solar:car

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision 		Previous revision
Last revision Both sides next revision
electrical:solar:car [2023/09/21 10:56]
frater_secessus [$410] 		electrical:solar:car [2024/01/04 12:53]
frater_secessus [$800]
Line 121: Line 121:
 ===== general principles ===== ===== general principles =====
  
-The [[electrical:12v:alternator|alternator]] is the most powerful charging source available in the vehicle.  The amount of power you can safely take from it [[electrical:12v:alternator_details#current|depends on the alternator's current rating]].  The alternator can charge the battery bank through [[electrical:12v:alternator#combiners|a relay]] (crudely) or [[electrical:12v:b2b|DC-DC charger]] (precisely).+The [[electrical:12v:alternator|alternator]] is the most powerful charging source available in the vehicle.  The amount of power you can safely take from it [[electrical:12v:alternator_details#current|depends on the alternator's current rating]].  The alternator can charge the battery bank through [[electrical:12v:alternator#combiners|a relay]] (crudely, cheaply) or [[electrical:12v:b2b|DC-DC charger]] (precisely, expensively).
  
 100w **solar panels** are ~$1/watt.  Used higher voltage panels are about 1/3rd of the price per watt, but require [[electrical:solar:charge_controller#mppt|an MPPT solar charge controller]] and are typically >200w.   100w **solar panels** are ~$1/watt.  Used higher voltage panels are about 1/3rd of the price per watt, but require [[electrical:solar:charge_controller#mppt|an MPPT solar charge controller]] and are typically >200w.  
Line 131: Line 131:
 This is a relatively large setup for a cardweller, but at this point we get to leverage the economies of larger batteries and used panels.   This is a relatively large setup for a cardweller, but at this point we get to leverage the economies of larger batteries and used panels.  
  
-  * 200w [[electrical:solar:panels#panel_voltage|higher-voltage]] used panel, mounted between luggage rails, ~$75+  * 250w [[electrical:solar:panels#panel_voltage|higher-voltage]] used panel, mounted between luggage rails, ~$80
   * [[electrical:12v:b2b#kisae|kisae DMT1230]] 30A MPPT+DC-DC, $225   * [[electrical:12v:b2b#kisae|kisae DMT1230]] 30A MPPT+DC-DC, $225
   * [[https://amzn.to/3EyQhKG|100Ah self-heated LiTime LiFePO4]] (or similar), $440   * [[https://amzn.to/3EyQhKG|100Ah self-heated LiTime LiFePO4]] (or similar), $440
   * small PSW inverter like [[https://amzn.to/48aWp9u|the Bestek 300w]], up to 500w would be comfortable for the battery.   * small PSW inverter like [[https://amzn.to/48aWp9u|the Bestek 300w]], up to 500w would be comfortable for the battery.
 +
 +Dropping to 50A LFP would decrease cost to ~$510. All numbers below would stay the ~same.((alternator should be limited to 25A charging, so 166Wh instead of 200Wh harvested))
  
 Actual power harvest would vary depending on the amount of driving (alternator), and [[electrical:solar:pvwatts|location/season]] (solar).  Let's assume 30 minutes of driving each day and middling latitudes like Salt Lake City.  Actual power harvest would vary depending on the amount of driving (alternator), and [[electrical:solar:pvwatts|location/season]] (solar).  Let's assume 30 minutes of driving each day and middling latitudes like Salt Lake City. 
  
-  * summer (June) - ~200Wh alternator + 1,186Wh solar = **1,387Wh/day** (1.73Wh/$) + 
-  * winter (December) - ~200Wh alternator + 335Wh solar = **535Wh/day**+==== performance ==== 
 + 
 +Solar, conditions described above 
 + 
 +  * summer (June) - ~200Wh alternator + 1,483Wh solar = **1,683Wh/day** (2.10Wh/$) 
 +  * winter (December) - ~200Wh alternator + 401Wh solar = **602Wh/day** 
 + 
 +loads 
 + 
 +  * DC ~50A (650w) 
 +  * AC (inverter) ~40A (520w)
  
 ===== $650 ===== ===== $650 =====
  
-As above, replacing the DC-DC/MPPT combo with separate relay/VSR and 20A MPPT. Solar harvest stays the same, but I'll estimate average alternator harvest [[https://rvwiki.mousetrap.net/doku.php?id=electrical:12v:directcharginglfp#comparison|drops by half]].  +As above, replacing the DC-DC/MPPT combo with separate relay/VSR and 20A MPPT. Solar harvest stays the same, but I'll estimate average alternator harvest [[https://rvwiki.mousetrap.net/doku.php?id=electrical:12v:directcharginglfp#comparison|drops by almost half]] at normal states of charge.   
  
  
-  * summer (June) - ~108Wh alternator + 1,186Wh solar = **1,295Wh/day** (1.99Wh/$) +  * summer (June) - ~130Wh alternator + 1,483Wh solar = **1,613Wh/day** (2.03Wh/$) 
-  * winter (December) - ~108Wh alternator + 335Wh solar = **443Wh/day**+  * winter (December) - ~130Wh alternator + 401Wh solar = **531Wh/day**
  
-===== $410 ===== 
  
-Simplifying with PWM controllers and relays instead of DC-DC.  1/2 the battery, so ~1/2 the alternator charging+===== $480 =====
  
-  * 50A LiFePO4+Simplifying with PWM controllers and relays instead of DC-DC.  1/2 the battery, so ~1/2 the alternator charging.  Price doesn't go down much because we are paying $1/watt retail for new panel.   
 + 
 +  * 50A LiFePO4, $160
   * combiner or VSR for alternator charging - $50   * combiner or VSR for alternator charging - $50
   * 2x 100w panel - $200   * 2x 100w panel - $200
Line 159: Line 172:
   * small PSW inverter like [[https://amzn.to/48aWp9u|the Bestek 300w]] - $60     * small PSW inverter like [[https://amzn.to/48aWp9u|the Bestek 300w]] - $60  
  
-Same assumptions as the above 
  
-  * summer (June) - ~54Wh alternator + 488Wh solar = **1,030Wh/day** (2.51Wh/$) +==== performance ====
-  * winter (December) - ~54Wh alternator + 284Wh solar = **338Wh/day**+
  
 +Solar, same assumptions as the above
  
  
 +  * summer (June) - ~65Wh alternator + 488Wh solar = **1,041Wh/day** (2.54Wh/$)
 +  * winter (December) - ~65Wh alternator + 284Wh solar = **349Wh/day**
 +
 +loads
 +
 +  * DC ~25A (325w)
 +  * AC (inverted) ~20A (260w)
 ===== $300 ===== ===== $300 =====
  
 Half the solar brings the cost (and harvest) down: Half the solar brings the cost (and harvest) down:
  
-  * 50A LiFePO4+  * 50A (640Wh) LiFePO4
   * combiner or VSR for alternator charging - $50   * combiner or VSR for alternator charging - $50
   * 100w panel - $100   * 100w panel - $100
Line 176: Line 195:
   * small PSW inverter like [[https://amzn.to/48aWp9u|the Bestek 300w]] - $60     * small PSW inverter like [[https://amzn.to/48aWp9u|the Bestek 300w]] - $60  
  
-Same assumptions as the above+==== performance ====
  
-  * summer (June) - ~108Wh alternator + 488Wh solar = **596Wh/day** (1.99Wh/$) 
-  * winter (December) - ~108Wh alternator + 142Wh solar = **250Wh/day** 
  
 +Solar, Same assumptions as the above
  
 +  * summer (June) - ~65Wh alternator + 488Wh solar = **553Wh/day** (1.84Wh/$)
 +  * winter (December) - ~65Wh alternator + 142Wh solar = **207Wh/day**
 +
 +loads
 +
 +  * DC ~25A (325w)
 +  * AC (inverted) ~20A (260w)
 ===== $110 ===== ===== $110 =====
  
Line 189: Line 214:
   * 10A single stage PWM charger - $15   * 10A single stage PWM charger - $15
  
 +==== performance ====
  
-Same assumptions as the above+Solar, same assumptions as the above
  
   * summer (June) - 488Wh solar = **488Wh/day** (4.44Wh/$)   * summer (June) - 488Wh solar = **488Wh/day** (4.44Wh/$)
   * winter (December) - 142Wh solar = **142Wh/day**   * winter (December) - 142Wh solar = **142Wh/day**
  
 +loads
 +
 +  * DC ~10A (130w)
 +  * no AC (inverter) loads
  
electrical/solar/car.txt · Last modified: 2024/01/04 12:56 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

affilliate disclosure

CC Attribution-Noncommercial-Share Alike 4.0 International Donate Powered by PHP Valid HTML5 Valid CSS Driven by DokuWiki