electrical:solar:nonessential
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electrical:solar:nonessential [2019/06/23 08:38]
frater_secessus [how much surplus current is there?] |
electrical:solar:nonessential [2019/10/01 13:05]
frater_secessus [when to run opportunity 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. | **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 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. | 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 [[electrical:solar:nonessential#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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| ===== when to run opportunity loads ===== | ===== when to run opportunity loads ===== |
| At the start of Absorption the controller still needs near-Bulk levels of current for charging. At the end it needs almost no current. **Halfway through Absorption about half of the system's peak power will be available for loads.** See the image at the top of the page for an example of how current demand drops in Absorption. | At the start of Absorption the controller still needs near-Bulk levels of current for charging. At the end it needs almost no current. **Halfway through Absorption about half of the system's peak power will be available for loads.** See the image at the top of the page for an example of how current demand drops in Absorption. |
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| For [[electrical:12v:lifepo4_batteries_thread|LiFePO4]] set the LVD to Vfloat; there is no actual Absorption stage _per se_ in fractional-C charging. We use these setpoints only because our traditional lead-acid controllers work that way. | For [[electrical:12v:deep_cycle_battery#lithium_chemistries|LiFePO4]] set the LVD to Vfloat; there is no actual Absorption stage _per se_ in fractional-C charging. We use these setpoints only because our traditional lead-acid controllers work that way. |
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| ===== timing opportunity loads ===== | ===== timing opportunity loads ===== |
electrical/solar/nonessential.txt ยท Last modified: 2023/10/18 19:08 by frater_secessus
