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electrical:solar:pwm_tweaking [2018/04/18 16:50] frater_secessus [Tweaking a PWM controller for maximum power] |
electrical:solar:pwm_tweaking [2020/07/18 18:49] frater_secessus [set Vabs and Vfloat relatively high] temp probe |
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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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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. | ||
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+ | 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' | ||
+ | |||
+ | DO invest in the $10 temperature probe option. | ||
==== 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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