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electrical:solar:status [2022/11/10 12:43] frater_secessus [in absorption] |
electrical:solar:status [2023/09/22 11:44] frater_secessus [setups with no float] |
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===== first collect a few numbers ===== | ===== first collect a few numbers ===== | ||
To tell at a glance what your system is doing you need to find a couple pieces of info about your system. | To tell at a glance what your system is doing you need to find a couple pieces of info about your system. | ||
+ | |||
+ | |||
+ | {{ https:// | ||
+ | |||
+ | ==== panel specs ==== | ||
+ | |||
+ | The [[electrical: | ||
+ | |||
+ | * **Vmp**, the voltage at which the panel makes max power under laboratory conditions((likely lower in reality)) | ||
+ | * **Voc**, the highest voltage the panel will put out under normal cirumstances. | ||
+ | * when in use, **Vpanel** is the panel voltage reported by the controller. | ||
+ | |||
+ | On the curve pictured at the right Vmp is at the peak of the red voltage line, and Voc is on the far right where output crashes to 0W. | ||
+ | |||
+ | |||
+ | ==== controller ==== | ||
+ | |||
* **Vabs** - the charge controller' | * **Vabs** - the charge controller' | ||
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==== transitioning to float ==== | ==== transitioning to float ==== | ||
- | When transitioning from Absorption to Float the voltage needs to drop about a volt. The system will " | + | When transitioning from Absorption to Float the voltage needs to drop about a volt. The system will " |
* Vbatt starts at Vabs | * Vbatt starts at Vabs | ||
- | * power harvest is cut off or greatly curtailed | + | * power harvest is cut off or greatly curtailed |
- | * vbatt drops to Vfloat | + | * Vbatt drops to Vfloat |
- | * when voltage | + | * when Vbatt reaches Vfloat the system will start making power to hold //that// setpoint. |
+ | |||
+ | ==== setups with no float ==== | ||
+ | |||
+ | Configurations with no float (" | ||
+ | |||
+ | - charge to the Absorption (" | ||
+ | - **stop charging** | ||
+ | - until voltage falls to the rebulk (" | ||
+ | - repeat | ||
+ | |||
+ | The fall to reBulk looks like the transition to Vfloat described above. In both cases the controller makes no (or practically no) power until the lower setpoint is reached. | ||
+ | |||
+ | === Renogy confusion === | ||
+ | |||
+ | By default Renogy Li profiles work this way, and cause much concern for Renogy users who have not read their manuals and/or who are not familiar with how solar charge controllers / chargers work. [The required information is present [[https:// | ||
+ | |||
+ | * **Rover series** - the table on page 37 of [[https:// | ||
+ | * **DC-DC/ | ||
+ | * **DC-DC charger** (20A/ | ||
+ | * page 18 says " | ||
+ | * there is no setting for Float charge, as shown in the table on page 17 of [[https:// | ||
+ | * page 18 says that Float is for lead only | ||
+ | * the manual does not state the 13.2v boost return setpoint [an egregious error - secessus] | ||
+ | |||
+ | Users uncomfortable with this behavior can set up the USER profile to meet their needs, including defining [[electrical: | ||
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+ | ===== sudden voltage spikes ===== | ||
+ | |||
+ | If you are seeing sudden voltage spikes and have lithium batteries, you may be seeing [[opinion: | ||
+ | |||
+ | The fix, described in the link above, is to **charge at a lower voltage** that does not antagonize the cells and trip the BMS. | ||
+ | |||
+ | |||
+ | ===== MPPT tracking sweeps ===== | ||
+ | {{ https:// | ||
+ | An **MPPT** controller must sweep the **P**ower **P**oints along the array voltage curve in order to **T**rack the **M**aximum (and non-maxiumum) power points. | ||
+ | Depending on the algorithm the sweep may a small one near presentVpanel, | ||
+ | The sweep will interfere with power production so the mfg attempts to find a balance between | ||
+ | * constant production, and | ||
+ | * learning whether or not one is operating at the optimal power point for present conditions | ||