Espejot
Hyperaktiivi
- Keskustelun aloittaja
- #121
Yli vai alimitoitus... onko mppt lataussäätimissä sama juttu kuininuissa eli ylimitoitamalla tehoa leikaantuu mutta kyynysjännite ylittyy helpommin aamulla ja illalla? Eli onko alimitoitamisessa mitään haittaa tehokuuden näkökulmasta?
MPPT controller maximum nominal operating power depends on the rated charge current and the nominal system voltage. During the middle of a sunny day, there may be more power than the controller can use with an oversized array. However, an oversized array will often contribute more power than a smaller array in the early morning and late afternoon, or even during the middle of a cloudy day. Excessive oversizing of the array may show a diminishing return if the power limiting is more significant.
Some of the benefits of exceeding the nominal wattage ratings of an MPPT controller include:
- Daily maximum power levels can be much lower than the STC rated power of the solar array. Tilt, azimuth angle, time of day/year, weather, climate, dust and other factors reduce output power from the array leaving unused controller capacity
- Full charging potential of the MPPT controller can be used more often
- Better production early and late in the day
- Better production during cloudy weather
- On sunny days, excess power is not needed once the batteries are close to full
- Reduced maximum charge current for smaller battery banks
- More string-sizing options with higher power arrays
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