electrical:solar:nonessential
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electrical:solar:nonessential [2023/06/19 14:29] frater_secessus [uses for opportunity loads] |
electrical:solar:nonessential [2023/10/18 19:08] (current) frater_secessus [when to run opportunity loads] |
===== when to run opportunity loads ===== | ===== when to run opportunity loads ===== |
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**The best time to run non-essential loads is when there is surplus current** over what battery charging needs. This means **during Float, or after current has started dropping off in Absorption**. For [[electrical:12v:deep_cycle_battery#lithium_chemistries|LiFePO4]] there is excess power any time after the bank has reached the intended charge state. | The optimal time to run loads is when there is **power available in excess of battery charging requirements**. When done at the right time, the loads are effectively run [[electrical:solar:offthepanel|off the panels]] rather than off the battery bank. This results in the bank having a higher state of charge both at sundown and morning. |
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Opportunity loads should not be applied during [[electrical:12v:charging|Bulk stage]] since Bulk, by definition, means the battery is taking all the available current.((assuming no charging limit has been configured in the [[electrical:solar:charge_controller|charge controller]]))\ | With **lead** this means **during Float**, or **in late Absorption** when charge current acceptance has fallen enough that the system can run the loads //and still maintain the Absorption voltage setpoint//. |
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**PWM controllers** will make [[electrical:solar:pwm_tweaking|most power during Absorption]] when voltage is highest. Wait until current demand falls low enough that your loads will not affect Absorption. | There is a little more wiggle room with [[electrical:12v:deep_cycle_battery#lithium_chemistries|LiFePO4]]; the loads can be run with no net negative effect on a Lithium system when |
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| * the bank has reached the intended charge state; or |
| * any time the bank can be //projected// to reach the intended charge state by sundown while carrying the extra loads. In effect, lithium allows you to "borrow" against future charging without penalty.. Exception: Lithium setups with PWM [[electrical:solar:charge_controller|solar charge controllers]] will make [[electrical:solar:pwm_tweaking|most power]] when bank voltage is highest. So waiting for Float or Absorption to run opportunity loads will mean the solar can make more Wh per day. |
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electrical/solar/nonessential.1687199388.txt.gz · Last modified: 2023/06/19 14:29 by frater_secessus