TIME – Number of seconds, an integer with possible time multiplier suffix ( s ~ 1, m ~ 60, h ~ 3600 or d ~ 24 * 3600) HEXSTR – Hexadecimal string (with 0x prefix)īOOL – Boolean value ( on/ off or true/ false) Simplified means that not all of the features are supported.įor the description of configuration items, we have to declare a meaning of the following symbols: The next equalization session will take place as determined by the day interval.Configuration files for Knot DNS use simplified YAML format.
When automatic equalization has not finished within a day, it will not resume the next day. The automatic equalization will end when the voltage limit has been reached or when the set maximum equalization duration has been reached, whichever comes first. The maximum equalization duration is set by default to 1 hour and can be configured between 0 minutes and 24 hours. The bulk current is set by default to the maximum charge current the solar charger is capable of, unless a lower charge current has been chosen. The current is by default limited to 8% of the bulk current and can be adjusted between 0% and 100%. When automatic equalization is active, the absorption charge will be followed by a voltage limited constant current period. When enabled, it can be configured with a number between 1 (every day) and 250 (once every 250 days).
Always check with the battery manufacturer prior to enabling equalization.Īutomatic equalization is by default disabled. These values are for 12 V batteries, multiply by two for 24V and by four for 48V.ĭo not equalize charge Gel, AGM, VRLA or lithium batteries.Įqualization can cause damage to the battery if the battery is not suitable for an equalization charge. The default setting for restarting the charge cycle is Vbat < (Vfloat – 0.4 V) for lead-acid, and Vbat (Vfloat – 0.1 V) for LiFePO4 batteries, during 1 minute. These settings are the recommended settings for LiFePO4 batteries, but they can be adjusted if the battery manufacturer specifications advise otherwise. The temperature compensation is disabled and the low temperature cut off is set to 5.
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The tail current is set to 0A, this so that the full absorption time is available for cell balancing.
The default absorption voltage is to 14.2V (28.4V) and the absorption time is fixed and set to 2 hours. This can be achieved by increasing the default absorption time multiplier (warning: the tail current of lead-acid batteries does not decrease to zero when the batteries are fully charged, and this “remaining” tail current can increase substantially when the batteries age). In some applications it may be preferable to terminate absorption time based on tail current only. Please see your battery manufacturer for recommended settings.Ībsorption time determined by tail current: Be aware this can result in overcharging your batteries. It is possible to override the default absorption time algorithm by setting a fixed absorption time when programming the solar charge controller. However, in most cases it is still better than a fixed absorption time regardless of other charge sources or battery state. This is an inherent issue in the default algorithm. This absorption time estimation can be incorrect if there is an additional charge source (eg alternator) or load on the batteries. The automatic absorption time is based on the start-up battery voltage (see table). This may occur when the PV voltage drops below the battery voltage due to bad weather, shade or similar.īattery being charged or discharged before solar charging begins: The charging algorithm will reset if charging has stopped for an hour. An example of when this voltage drop could occur is when PV power (due to clouds, trees, buildings) is insufficient to charge the battery and to power the loads. The absorption time counter starts when the configured absorption voltage is reached and pauses when the output voltage is below the configured absorption voltage.
Unable to select 36V or 48V battery voltage Max PV output power relates to battery voltage Temperature difference between solar charger and battery Battery voltage, PV voltage and current rating
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