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electrical:solar:charge_controller [2023/09/06 12:05] frater_secessus [MPPT] |
electrical:solar:charge_controller [2023/09/26 11:25] frater_secessus [how to choose] |
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+ | === panel selection for PWM === | ||
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+ | PWM makes the most power when coupled with panels whose operating [[electrical: | ||
+ | |||
+ | Examples: | ||
+ | |||
+ | * 16.28v Vmp panel spec would be optimal for 14.8v Absorption, as we might use for flooded lead acid. 14.8v x 1.1 = 16.28v. | ||
+ | * 15.62v Vmp panel spec would be optimal for 14.2v Absorption, as we might use for Gel or LiFePO4. | ||
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+ | |||
+ | Some [[electrical: | ||
==== MPPT ==== | ==== MPPT ==== | ||
[[http:// | [[http:// | ||
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There are some considerations when [[electrical: | There are some considerations when [[electrical: | ||
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+ | == panel selection for MPPT == | ||
+ | |||
+ | MPPT thrives on voltage. | ||
+ | |||
+ | Note that [[electrical: | ||
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== when PWM beats MPPT == | == when PWM beats MPPT == | ||
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See also [[electrical: | See also [[electrical: | ||
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+ | ==== should I upgrade my PWM to MPPT? ==== | ||
+ | |||
+ | If the system has changed and now MPPT is required for one of the reason above, then yes. | ||
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+ | But most people consider this switch to make "more power", | ||
+ | |||
+ | So the questions are: | ||
+ | |||
+ | - do you need more power than you are getting now? | ||
+ | - would +15% be enough to meet your needs | ||
+ | - if so, would you pay [whatever the MPPT costs] to get that +15%? | ||
+ | |||
+ | There is a saying in solar circles that " | ||
===== multiple charge controllers | ===== multiple charge controllers | ||
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==== present use ==== | ==== present use ==== | ||
- | In practice the LOAD terminals typically are either ignored((some well-respected controllers don't have them anymore)) or used as [[electrical: | + | In practice the LOAD terminals typically are either ignored((some well-respected controllers don't have them anymore)) or used as [[electrical: |
- | + | ||
- | One benefit to doing this is you can define | + | |
==== why loads aren't powered from LOAD terminals ==== | ==== why loads aren't powered from LOAD terminals ==== |