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electrical:solar:pwm_tweaking [2017/11/26 18:23] frater_secessus [battery: maintain a higher state of charge] |
electrical:solar:pwm_tweaking [2018/03/24 07:54] frater_secessus [delay loads until after Bulk] |
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====== Tweaking a PWM controller for maximum power ====== | ====== Tweaking a PWM controller for maximum power ====== | ||
- | PWM controllers are inexpensive and durable, but typically | + | [[electrical: |
- | Note: much of this information also applies to [[electrical: | + | Note: much of this information also applies to [[electrical: |
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During charging with a PWM controller **the solar panel will be running at the voltage of the battery bank**. | During charging with a PWM controller **the solar panel will be running at the voltage of the battery bank**. | ||
- | This affects charging in all three [[electrical: | + | This affects charging in all three [[electrical: |
{{ http:// | {{ http:// | ||
- | 17.8v x 5.6A = 99.68w < | + | 17.8v x 5.6A = 99.68w < |
+ | 17.8v x 5.6A = 94.70w <-- MPPT running at 95% efficiency | ||
14.8v x 5.6A = 82.88w <-- power at a high Absorption voltage, as with flooded lead acid \\ | 14.8v x 5.6A = 82.88w <-- power at a high Absorption voltage, as with flooded lead acid \\ | ||
- | 14.4v x 5.6A = 80.64w <-- power at a lower Absorption voltage, as with AGM \\ | + | 14.4v x 5.6A = 80.64w <-- power at a lower Absorption voltage |
+ | 14.2v x 5.6A = 79.52w <-- power at a low Absorption voltage | ||
13.8v x 5.6A = 77.28W <-- power at high Float, as with deeply cycled banks \\ | 13.8v x 5.6A = 77.28W <-- power at high Float, as with deeply cycled banks \\ | ||
13.2v x 5.6A = 73.92W <-- power at low Float, as with lightly cycled banks \\ | 13.2v x 5.6A = 73.92W <-- power at low Float, as with lightly cycled banks \\ | ||
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12.1v x 5.6A = 67.76W <-- power at 50% state of charge; | 12.1v x 5.6A = 67.76W <-- power at 50% state of charge; | ||
- | This last number shows how far off PWM output can fall when battery voltage is at its lowest. | + | This last number shows how far off PWM output can fall when battery voltage is at its lowest.((The last number is also the source of the "30% boost!!!" |
===== the plan ===== | ===== the plan ===== | ||
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During the bulk charging stage the battery needs every bit of power it can get. Any loads applied during this stage slow down charging and, more importantly, | During the bulk charging stage the battery needs every bit of power it can get. Any loads applied during this stage slow down charging and, more importantly, | ||
- | Wait until your bank is well into Absoroption | + | Wait until your bank is well into Absorption |
==== set Vabs and Vfloat relatively high ==== | ==== set Vabs and Vfloat relatively high ==== | ||