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opinion:frater_secessus:controllers_and_dollars_per_watt [2020/04/16 17:43] 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 | ||
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+ | NOTE: this is a rough draft. | ||
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====== 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: | ||
+ | |||
+ | |||
+ | ===== general conclusion ===== | ||
+ | |||
+ | The general pattern is that MPPT typically makes more power in absolute terms, and PWM/shunt make more power per dollar spent. | ||
+ | |||
+ | |||
+ | |||
+ | |||
+ | ===== raw cost ===== | ||
+ | |||
+ | In terms of initial investiment, | ||
+ | |||
+ | - [[electrical: | ||
+ | - shunt + mono panels | ||
+ | - [[electrical: | ||
+ | - PWM + mono panels (not recommended due to low Imp) | ||
+ | - [[electrical: | ||
+ | - MPPT + whatever panels are cheapest | ||
===== Morning, ideal ===== | ===== Morning, ideal ===== | ||
- | (12.1v), 50deg F, perfect insolation | + | (12.1v), 50deg F, perfect insolation |
- | - 20A MPPT 200W poly/mono, 174.80W | + | ranked by **output** |
- | - 10a PWM 100W poly 62.94W @ **$1.82/ | + | |
- | - 10a MPPT mono/poly 87.4W @ **$1.84/ | + | |
- | - 10a PWM 100w mono 59.25W @ **$1.93/ | + | |
- | - 20a PWM 200w poly 125.89W @ **$1.99/W** | + | |
- | Same data ranked by **output** | + | - 20A MPPT 200W poly/ |
+ | - 20a PWM 200w poly **125.89W** @ $1.99/ | ||
+ | - 10A MPPT 200w mono/poly, **121W** @ $2.16/ | ||
+ | - 10a MPPT 100W mono/poly **87.4W** @ $1.84/ | ||
+ | - 10a PWM 100W poly **62.94W** @ $1.82/ | ||
- | | + | |
- | - 20a PWM 200w poly **125.89W** @ $1.99/W | + | ranked by **$/ |
- | - 10a MPPT mono/ | + | |
- | - 10a PWM 100W poly **62.94W** @ $1.82/W | + | |
- | - 10a PWM 100w mono **59.25W** @ $1.93/W | + | - 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. | ||
===== Morning, 75% insolation ===== | ===== Morning, 75% insolation ===== | ||
- | (12.1v), 75% insolation - ranked by $/ | + | (12.1v), 75% insolation - I did not calculate mono on these, as PWM performs better on poly and MPPT doesn' |
- | - 10A MPPT 200w mono/poly, 121W @ **$2.16/W** | ||
- | - 10A PWM 100w poly, 47.21W | ||
- | - 10 MPPT 100w mono/poly 65.55W | ||
- | - 20A PWM 200w poly 94.42W @ **$2.76/W** | ||
- | Same information | + | ranked by **output**: |
+ | |||
+ | - 20A MPPT 200w mono/poly, **131.1W** @ $2.20/ | ||
+ | - 10A MPPT 200w mono/poly, **121W** @ $2.16/ | ||
+ | - 20A PWM 200w poly **94.42W** @ $2.76/ | ||
+ | - 10 MPPT 100w mono/poly **65.55W** | ||
+ | - 10A PWM 100w poly, **47.21W** | ||
- | - 10A MPPT 200w mono/ | + | ranked by **$/watt**. |
- | - 20A PWM 200w poly **94.42W** @ $2.76/W | + | |
- | - 10 MPPT 100w mono/poly **65.55W** | + | |
- | - 10A PWM 100w poly, **47.21W** | + | |
+ | - 10A MPPT 200w mono/poly, 121W @ **$2.16/ | ||
+ | - 20A MPPT 200w mono/poly, 131.1W @ **$2.20/ | ||
+ | - 10A PWM 100w poly, 47.21W | ||
+ | - 10 MPPT 100w mono/poly 65.55W | ||
+ | - 20A PWM 200w poly 94.42W @ **$2.76/ | ||
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- | (14.6v), 70deg F, perfect insolation - ranked by **$/watt** | + | (14.6v), 70deg F, perfect insolation - |
- | - 10A PWM 100w poly 82.05W @ **$1.39/W** | ||
- | - 10A PWM mono 77.23W @ **$1.48/W** | ||
- | - 20A PWM 200w poly 164.10W @ **$1.52/W** | ||
- | - 20A PWM 200w mono 154.47W @ **$1.62/W** | ||
- | - 20A MPPT mono/poly 165.27W @ **$1.75/W** | ||
- | - 10A MPPT mono/poly 82.63W @ **$1.95/W** | ||
- | same data sorted | + | ranked |
- | - 20A MPPT mono/poly **165.27W** @ $1.75/W | + | - 20A MPPT 200w mono/poly **165.27W** @ $1.75/W. $289. |
- | - 20A PWM 200w poly **164.10W** @ $1.52/W | + | - 20A PWM 200w poly **164.10W** @ $1.52/W. $250. |
- | - 20A PWM 200w mono **154.47W** @ $1.62/W | + | - 20A PWM 200w mono **154.47W** @ $1.62/W. $250. |
- | - 10A MPPT mono/poly **82.63W** @ $1.95/W | + | - 10A MPPT 200w mono/poly **146.0W** @ $1.78/ |
- | - 10A PWM 100w poly **82.05W** @ 1.39/W | + | - 10A MPPT 100W mono/poly **82.63W** @ $1.95/W. $161. |
- | - 10A PWM mono **77.23W** @ $1.48/W | + | - 10A PWM 100w poly **82.05W** @ 1.39/W. $115. |
+ | - 10A PWM 100w mono **77.23W** @ $1.48/W. $115. | ||
+ | ranked by **$/watt** | ||
+ | |||
+ | - 10A PWM 100w poly 82.05W @ **$1.39/ | ||
+ | - 10A PWM 100w mono 77.23W @ **$1.48/ | ||
+ | - 20A PWM 200w poly 164.10W @ **$1.52/ | ||
+ | - 20A PWM 200w mono 154.47W @ **$1.62/ | ||
+ | - 20A MPPT 200W mono/poly 165.27W @ **$1.75/ | ||
+ | - 10A MPPT 200w mono/poly 146.0W @ **$1.78/ | ||
+ | - 10A MPPT 100W mono/poly 82.63W @ **$1.95/ | ||
===== Afternoon, 75% insolation ===== | ===== Afternoon, 75% insolation ===== | ||
- | (14.6v), 75% insolation - ranked by $/watt. | + | (14.6v), 75% insolation - |
+ | |||
+ | |||
+ | |||
+ | ranked by **output**: | ||
- | - 10A PWM, 100w poly, 61.54 @ **$1.62/W** | + | - 20A MPPT 200W mono/poly **125.93W** @ $2.29/W. $289 |
- | - 10A MPPT, 200w mono/ | + | - 10A MPPT, 200w mono/ |
- | - 20A PWM, 200w poly, 123.08W | + | - 20A PWM, 200w poly, **123.08W** |
- | - 10A MPPT, 100w mono/poly, 61.99w | + | - 10A MPPT, 100w mono/ |
+ | - 10A PWM, 100w poly, | ||
+ | ranked by **$/watt** | ||
- | Same information, sorted by **output**: | + | - 10A PWM, 100w poly, 61.54 @ **$1.62/ |
+ | - 10A MPPT, 200w mono/poly 125.93.0W @ **$2.07/ | ||
+ | - 20A PWM, 200w poly, 123.08W | ||
+ | - 10A MPPT, 100w mono/poly, 61.99w | ||
- | - 10A MPPT, 200w mono/poly **146.0W** @ $1.79/W | ||
- | - 20A PWM, 200w poly, **123.08W** | ||
- | - 10A MPPT, 100w mono/poly, **61.99w** | ||
- | - 10A PWM, 100w poly, **61.54** @ $1.62/W |