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electrical:solar:nonessential [2020/07/08 14:59]
frater_secessus [LVD + timer] |
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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| | 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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| * [[hvac:dehumidifier|dehumidification]] | * [[hvac:dehumidifier|dehumidification]] |
| * [[electrical:12v:laptop|laptop]] and phone charging | * [[electrical:12v:laptop|laptop]] and phone charging |
| * rice cooker((http://www.cheaprvliving.com/forums/Thread-How-much-solar-do-I-need?pid=141508#pid141508)) | * [[food:cooking:excess_power|cooking with small appliances]] |
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