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electrical:solar:pwm_tweaking [2018/03/24 07:52] frater_secessus [the controller's achilles heel] |
electrical:solar:pwm_tweaking [2019/07/17 08:20] frater_secessus [set Vabs and Vfloat relatively high] |
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====== Tweaking a PWM controller for maximum power ====== | ====== Tweaking a PWM controller for maximum power ====== | ||
- | [[electrical: | + | [[electrical: |
Note: much of this information also applies to [[electrical: | Note: much of this information also applies to [[electrical: | ||
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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.((The last number is also the source of the "30% boost!!!" | + | This last number shows how far off PWM output can fall when battery voltage |
===== 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 ==== | ||
Since the panels make more power at higher voltages((up to Vmp)) cranking up Vabs and Vfloat to higher-but-still-sane levels will result in more power being harvested. | Since the panels make more power at higher voltages((up to Vmp)) cranking up Vabs and Vfloat to higher-but-still-sane levels will result in more power being harvested. | ||
+ | |||
+ | Using the above panel as an example, Vabs of 14.7v will yield 3.5% more power than a Vabs of 14.1v. | ||
+ | Note: consult the battery manufacturer' | ||
+ | |||
==== battery: maintain a higher state of charge ==== | ==== battery: maintain a higher state of charge ==== | ||
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* keeping your bank as charged as possible will let the panels produce the most power for conditions | * keeping your bank as charged as possible will let the panels produce the most power for conditions | ||
- | In other words, the lower your battery voltage gets the worse the system | + | In other words, the lower your battery voltage gets the worse the pwm charging |
- **Cycle less deeply** - Instead of cycling to 50% state of charge (12.2v) consider cycling to only 75% SoC (12.4v). | - **Cycle less deeply** - Instead of cycling to 50% state of charge (12.2v) consider cycling to only 75% SoC (12.4v). | ||
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