electrical:solar:nonessential
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electrical:solar:nonessential [2019/06/23 08:36] frater_secessus [how much surplus current is there?] pwm heat |
electrical:solar:nonessential [2019/06/23 08:38] frater_secessus [how much surplus current is there?] |
**During Absorption** the charge current is tapering down as the battery accepts less; the more it tapers down the more is available for loads.((agaom. normal + opportunity)) At the very beginning of Absorption ~0% of "bonus" output is available. At the very end of Absorption ~99% is available. Mid-way through Absorption((judging by current not time)) ~49% of the panels' output is available for loads. | **During Absorption** the charge current is tapering down as the battery accepts less; the more it tapers down the more is available for loads.((agaom. normal + opportunity)) At the very beginning of Absorption ~0% of "bonus" output is available. At the very end of Absorption ~99% is available. Mid-way through Absorption((judging by current not time)) ~49% of the panels' output is available for loads. |
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There will generally be more "surplus" power available when using MPPT charge controllers v. PWM,((http://forum.solar-electric.com/discussion/comment/372165#Comment_372165))((http://forum.solar-electric.com/discussion/comment/250746#Comment_250746)) though the difference is smaller in Float and late Absorption we one would run opportunity loads anyhow. Siphoning off power can actually help PWM controllers run cooler by reducing the ON-OFF switching activity that generates heat. | There will generally be more "surplus" power available when using MPPT charge controllers v. PWM,((http://forum.solar-electric.com/discussion/comment/372165#Comment_372165))((http://forum.solar-electric.com/discussion/comment/250746#Comment_250746)) though the difference is less dramatic during periods one would run opportunity loads (see [[http://rvwiki.mousetrap.net/doku.php?id=e#when_to_run_opportunity_loads|below]]). Siphoning off power can actually help PWM controllers run cooler by reducing the ON-OFF switching activity that generates heat. |
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It is for the same reason MPPT provides more current in Bulk: panel voltage (Vmpp) is not constrained to output voltage ([[electrical:12v:electrical_notation|Vabs]] or [[electrical:12v:electrical_notation|Vfloat]]) and excess voltage is converted into extra current. | |
===== when to run opportunity loads ===== | ===== when to run opportunity loads ===== |
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electrical/solar/nonessential.txt ยท Last modified: 2023/10/18 19:08 by frater_secessus