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19
June 2020
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Solar Stik® Inc.
24VDC Li Expander Pak 1300 Operator Manual
MAINTENANCE INSTRUCTIONS
Expander Pak Storage
There is a simple rule to remember about maintaining the Expander batteries:
Never store an Expander Pak in a discharged state! Charge the
Expander Pak fully before placing it in storage.
Other than keeping the battery fully charged during storage, an LiFePO
4
-type of battery does not
require any type of maintenance by the operator.
The Expander Pak has a relatively low self-discharge rate at 77 ºF (25 ºC) and can be stored for up
to one (1) year at this temperature before it needs to be recharged. However, the self-discharge rate
increases as the storage temperature increases. See In-storage Preventive Maintenance Checks and
Services for complete specific charging instructions for a particular Expander Pak battery chemistry.
Note:
If the Expander Pak is stored at temperatures above 91 ºF (33 ºC), then the time between
maintenance checks and / or charges must be reduced to three (3) months.
In-Storage Charging Procedures:
Charge one—charge all. It is important to maintain an equal level of health between all
Expander Paks in a System. If one (1) Expander Pak in a System needs to be charged
during storage, it is likely that any/all others will also need to be charged. Charging all of the
Expander Paks until the they meet the criteria of being charged fully will maintain balance and
equality among them.
CAUTION
Do NOT leave Li Expander Paks on a constant charge during long periods of storage. Cell damage
may occur. Once the battery reaches 100% SOC during maintenance charging, the charging
source should be removed until the next charging interval is determined.
Do NOT use a BMS reader to determine Li Expander Pak SOC during periods of storage. The
BMS’ reported values for SOC are not calculated using “cell self-discharge” information, which
occurs in all batteries. The SOC may be reported at 100% even though the cells may only be at
50%.