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electrical:12v:charging [2019/01/03 16:52]
frater_secessus |
electrical:12v:charging [2019/07/17 08:17]
frater_secessus [charging deep cycle batteries] |
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| In general, manufacturers of lead chemistries specifiy a charging at [[electrical:12v:battery_capacity|C/10]]; this assumes more charging time than solar power allows.((http://www.cheaprvliving.com/forums/showthread.php?tid=23606&pid=288284#pid288284)) Regularly cycled banks may benefit from firmer charging at C/3. There may not be a practical maximum charging rate for cycled FLA batteries //when charged from solar//. As Sternwake put it when describing a C/1.5 (!) charging scenario, "solar is not instant max output."((http://www.cheaprvliving.com/forums/showthread.php?tid=23606&pid=288284#pid288284)) | In general, manufacturers of flooded lead chemistries specify charging at [[electrical:12v:battery_capacity|C/10]] to C/5; this assumes more charging time than solar power allows.((http://www.cheaprvliving.com/forums/showthread.php?tid=23606&pid=288284#pid288284)) AGM are typically charged at C/5 to C/3. There may not be a practical maximum charging rate for cycled FLA batteries //when charged from solar//. As Sternwake put it when describing a C/1.5 (!) charging scenario, "solar is not instant max output."((http://www.cheaprvliving.com/forums/showthread.php?tid=23606&pid=288284#pid288284)) |
| ===== three stage charging ===== | ===== three stage charging ===== |
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| ===== charge-and-stop ===== | ===== charge-and-stop ===== |
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| [[electrical:solar:charge_controller#shunt_controllers|Shunt chargers]] have a charge-and-stop approach where they: | [[electrical:solar:charge_controller#shunt_controllers|Shunt]] (on/off) chargers have a charge-and-stop approach where they: |
| - charge to [[electrical:12v:hvd|High Voltage Disconnect]] (Vhvd) and stop | - charge to [[electrical:12v:hvd|High Voltage Disconnect]] (Vhvd) and stop |
| - fall in voltage to a High Voltage Reconnect (Vhvr) | - fall in voltage to a High Voltage Reconnect (Vhvr) |
| - repeat | - repeat |
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| | **This differs from PWM** because PWM can hold an average voltage by cutting power hundreds or thousands of times a second. If you make a setpoint for 13.6v it will hold 13.6v as long as sun and [[electrical:12v:loads|loads]] cooperate. A shunt programmed to charge to disconnect at 13.6v and reconnect at 12.7v will average 13.05v. |
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| These setpoints may or may not be user-configurable. | These setpoints may or may not be user-configurable. |
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| AGM batteries are kept healthy by: | AGM batteries are kept healthy by: |
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| - vigorous Bulk charging, sometimes greater than solar-only charging can provide.((http://www.cheaprvliving.com/forums/Thread-anyone-familiar-with-Worker-AGM-batteries?pid=97068#pid97068)) Consider augmenting with alternator or shore power charging. | - vigorous Bulk charging((minimum current of [[electrical:12v:battery_capacity|C/5]] up to C/3)) sometimes greater than solar-only charging can provide.((http://www.cheaprvliving.com/forums/Thread-anyone-familiar-with-Worker-AGM-batteries?pid=97068#pid97068)) Consider augmenting with alternator or shore power charging. |
| - long Absorption stages | - long Absorption stages |
| - but lower Absorption voltage (to prevent outgassing) | - but lower Absorption voltage (to prevent outgassing) |
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| Water levels should be topped off //after// equalization.((exposed plates should be covered before EQ, though)) Doing so before equalization could result in spillover. | If water levels are below the plates, add enough water to cover the plates before equalizing. Then top off //after// equalization. Topping off before equalization could result in spillover and loss of electrolyte. |
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| A [[http://amzn.to/2gEtVwL|battery waterer]] can make the job easier, and does not require one to judge water level visually. | A [[http://amzn.to/2gEtVwL|battery waterer]] can make the job easier, and does not require one to judge water level visually. The water "bloops" as it fills and stops blooping when the water is at the correct level. |
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| Batteries that are older, in poorer health, or are charged at higher voltages will be "thirstier". Check water levels 1x/month until you know how they behave. | Batteries that are older, in poorer health, or are charged at higher voltages will be "thirstier". Check water levels 1x/month until you know how they behave. |
