Replacing iPack Batteries
Lead acid batteries such as the one used in the Symphonie iPack need to be kept fully charged. Battery capacity will be reduced if the battery is allowed to discharge below 10.5 volts for an extended period of time. If your iPack battery has been completely discharged (due to PV not charging or connected improperly, for example) it may need to be replaced. This is especially true in colder environments where battery capacity is further reduced due to the low temperatures.
This application note explains how to change an iPack battery.
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NRG Class 1 Anemometer
Thies First Class Advanced Anemometer
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