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opinion:frater_secessus:controllers_and_dollars_per_watt [2020/04/16 17:51]
frater_secessus 		opinion:frater_secessus:controllers_and_dollars_per_watt [2021/06/26 14:18]
frater_secessus [cost analysis of small controller / panel combinations]
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 +fixme
 +
 +NOTE:  this is a rough draft.  Costs based on prices on Amazon of Renogy controllers where available. 
 +
 +
 +
 ====== cost analysis of small controller / panel combinations ====== ====== cost analysis of small controller / panel combinations ======
  
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 I ran some numbers, using Renogy gear where possible:  I ran some numbers, using Renogy gear where possible: 
  
-===== Morning, ideal ===== 
  
 +===== general conclusion =====
  
-(12.1v), 50deg F, perfect insolation - ranked by **$/watt**+The general pattern is that MPPT typically makes more power in absolute terms, and PWM/shunt make more power per dollar spent.  
  
-  - 20A MPPT 200W poly/mono, 174.80W  @ **$1.65/W**.  $289. 
-  - 10a PWM 100W poly 62.94W @ **$1.82/W**.  $115. 
-  - 10a MPPT mono/poly 87.4W @ **$1.84/W**.  $161. 
-  - 10a PWM 100w mono 59.25W @ **$1.93/W**.  $115. 
-  - 20a PWM 200w poly 125.89W @ **$1.99/W**.  $250. 
  
-Same data ranked by **output**+ 
 + 
 +===== raw cost ===== 
 + 
 +In terms of initial investiment, from least expensive to most expensive 
 + 
 +  - [[electrical:solar:shunt_tweaking|shunt]] + poly panels.  Shunts have similar performance characteristics to PWM but are simpler.  [[electrical:12v:charging|Smart charging]] may not be available. They tend to be very cheap, $1 per rated amp. 
 +  - shunt + mono panels  (not recommended due to low Imp) 
 +  - [[electrical:solar:pwm_tweaking|PWM]] + poly panels 
 +  - PWM + mono panels (not recommended due to low Imp) 
 +  - [[electrical:solar:overpaneling|overpaneled]] MPPT + whatever panels are cheapest.  In this model a slightly undersized (and therefore less expensive) controller is used.((Shunt and PWM cannot be overpaneled safely as they have no ability to reduce their current throughput)) 
 +  - MPPT + whatever panels are cheapest 
 + 
 +===== Morning, ideal ===== 
 + 
 + 
 +(12.1v), 50deg F, perfect insolation  
 + 
 +ranked by **output**
  
   - 20A MPPT 200W poly/mono, **174.80W**  @ $1.65/W.  $289.   - 20A MPPT 200W poly/mono, **174.80W**  @ $1.65/W.  $289.
   - 20a PWM 200w poly **125.89W** @ $1.99/W.  $250.   - 20a PWM 200w poly **125.89W** @ $1.99/W.  $250.
 +  - 10A MPPT 200w mono/poly, **121W** @ $2.16/W.  $261.
   - 10a MPPT 100W mono/poly **87.4W** @ $1.84/W.  $161.   - 10a MPPT 100W mono/poly **87.4W** @ $1.84/W.  $161.
   - 10a PWM 100W poly **62.94W** @ $1.82/W.  $115.   - 10a PWM 100W poly **62.94W** @ $1.82/W.  $115.
-  - 10a PWM 100w mono **59.25W** @ $1.93/W.  $115. 
  
  
-===== Morning, 75% insolation =====+ranked by **$/watt**
  
-(12.1v), 75% insolation - ranked by $/watt.  I did not calculate mono on these, as PWM performs better on poly and MPPT doesn't care.+  - 20A MPPT 200W poly/mono, 174.80W  @ **$1.65/W**.  $289. 
 +  - 10a PWM 100W poly 62.94W @ **$1.82/W**.  $115. 
 +  - 10a MPPT mono/poly 87.4W @ **$1.84/W**.  $161. 
 +  - 10a PWM 100w mono 59.25W @ **$1.93/W**.  $115. 
 +  - 20a PWM 200w poly 125.89W @ **$1.99/W**.  $250.
  
-  - 10A MPPT 200w mono/poly, 121W @ **$2.16/W**.  $261. 
-  - 10A PWM 100w poly, 47.21W  @ **$2.42/W**.  $115. 
-  - 10 MPPT 100w mono/poly 65.55W  @ **$2.46/W**.  $161. 
-  - 20A PWM 200w poly 94.42W @  **$2.76/W**.  $250. 
  
-Same information ranked by **output**:  +===== Morning, 75% insolation =====
  
 +(12.1v), 75% insolation - I did not calculate mono on these, as PWM performs better on poly and MPPT doesn't care.
 +
 +
 +ranked by **output**:  
 + 
 +  - 20A MPPT 200w mono/poly, **131.1W** @ $2.20/W.  $289.
   - 10A MPPT 200w mono/poly, **121W** @ $2.16/W.  $261.   - 10A MPPT 200w mono/poly, **121W** @ $2.16/W.  $261.
   - 20A PWM 200w poly **94.42W** @  $2.76/W.  $250.   - 20A PWM 200w poly **94.42W** @  $2.76/W.  $250.
Line 47: Line 72:
   - 10A PWM 100w poly, **47.21W**  @ $2.42/W.  $115.   - 10A PWM 100w poly, **47.21W**  @ $2.42/W.  $115.
  
 +ranked by **$/watt**.  
 +
 +  - 10A MPPT 200w mono/poly, 121W @ **$2.16/W**.  $261.
 +  - 20A MPPT 200w mono/poly, 131.1W @ **$2.20/W**.  $289.
 +  - 10A PWM 100w poly, 47.21W  @ **$2.42/W**.  $115.
 +  - 10 MPPT 100w mono/poly 65.55W  @ **$2.46/W**.  $161.
 +  - 20A PWM 200w poly 94.42W @  **$2.76/W**.  $250.
  
  
Line 52: Line 84:
  
  
-(14.6v), 70deg F, perfect insolation - ranked by **$/watt**+(14.6v), 70deg F, perfect insolation - 
  
-  - 10A PWM 100w poly 82.05W @ **$1.39/W**.  $115. 
-  - 10A PWM 100w mono 77.23W @ **$1.48/W**.  $115. 
-  - 20A PWM 200w poly 164.10W @ **$1.52/W**.  $250. 
-  - 20A PWM 200w mono 154.47W @ **$1.62/W**.  $250. 
-  - 20A MPPT 200W mono/poly 165.27W @ **$1.75/W**.  $289. 
-  - 10A MPPT 100W mono/poly 82.63W @ **$1.95/W**.  $161. 
  
-same data sorted by **output**:+ranked by **output**:
  
   - 20A MPPT 200w mono/poly **165.27W** @ $1.75/W.  $289.   - 20A MPPT 200w mono/poly **165.27W** @ $1.75/W.  $289.
   - 20A PWM 200w poly **164.10W** @ $1.52/W.  $250.   - 20A PWM 200w poly **164.10W** @ $1.52/W.  $250.
   - 20A PWM 200w mono **154.47W** @ $1.62/W.  $250.   - 20A PWM 200w mono **154.47W** @ $1.62/W.  $250.
 +  - 10A MPPT 200w mono/poly **146.0W** @ $1.78/W.  $260.
   - 10A MPPT 100W mono/poly **82.63W** @ $1.95/W.  $161.   - 10A MPPT 100W mono/poly **82.63W** @ $1.95/W.  $161.
   - 10A PWM 100w poly **82.05W** @ 1.39/W.  $115.   - 10A PWM 100w poly **82.05W** @ 1.39/W.  $115.
   - 10A PWM 100w mono **77.23W** @ $1.48/W.  $115.   - 10A PWM 100w mono **77.23W** @ $1.48/W.  $115.
  
 +ranked by **$/watt**
 +
 +  - 10A PWM 100w poly 82.05W @ **$1.39/W**.  $115.
 +  - 10A PWM 100w mono 77.23W @ **$1.48/W**.  $115.
 +  - 20A PWM 200w poly 164.10W @ **$1.52/W**.  $250.
 +  - 20A PWM 200w mono 154.47W @ **$1.62/W**.  $250.
 +  - 20A MPPT 200W mono/poly 165.27W @ **$1.75/W**.  $289.
 +  - 10A MPPT 200w mono/poly 146.0W @ **$1.78/**W.  $260.
 +  - 10A MPPT 100W mono/poly 82.63W @ **$1.95/W**.  $161.
  
 ===== Afternoon, 75% insolation ===== ===== Afternoon, 75% insolation =====
  
  
-(14.6v), 75% insolation - ranked by $/watt.+(14.6v), 75% insolation - 
  
-  - 10A PWM, 100w poly,  61.54 @ **$1.62/W**.  $115. 
-  - 10A MPPT, 200w mono/poly 146.0W @ **$1.79/W**.  $261. 
-  - 20A PWM, 200w poly, 123.08W  @ **$2.12/W**.  $250. 
-  - 10A MPPT, 100w mono/poly, 61.99w  @ **$2.60/W** 
  
  
-Same information, sorted by **output**:+ranked by **output**:
  
-  - 10A MPPT, 200w mono/poly **146.0W** @ $1.79/W.  $261.+  - 20A MPPT 200W mono/poly **125.93W** @ $2.29/W. $289 
 +  - 10A MPPT, 200w mono/poly **125.93W** @ $2.07/W.  $261.((same output as 20A controller;  panel yield is less than 10A))
   - 20A PWM, 200w poly, **123.08W**  @ $2.12/W.  $250.   - 20A PWM, 200w poly, **123.08W**  @ $2.12/W.  $250.
-  - 10A MPPT, 100w mono/poly, **61.99w**  @ $2.60/W+  - 10A MPPT, 100w mono/poly, **61.99w**  @ $2.60/W.  $161.
   - 10A PWM, 100w poly,  **61.54** @ $1.62/W.  $115.   - 10A PWM, 100w poly,  **61.54** @ $1.62/W.  $115.
 +
 +ranked by **$/watt**
 +
 +  - 10A PWM, 100w poly,  61.54 @ **$1.62/W**.  $115.
 +  - 10A MPPT, 200w mono/poly 125.93.0W @ **$2.07/W**.  $261.
 +  - 20A PWM, 200w poly, 123.08W  @ **$2.12/W**.  $250.
 +  - 10A MPPT, 100w mono/poly, 61.99w  @ **$2.60/W**.  $161.
 +
opinion/frater_secessus/controllers_and_dollars_per_watt.txt · Last modified: 2021/06/26 14:33 by frater_secessus

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