9 Cleaning and Maintenance SMA Solar Technology AG
50 SI80H-BE-BEN120810 Operating Manual
9.6 Checking and Maintaining the Battery
1. Stop the off-grid system and switch off the off-grid inverter (see Section 5).
2. Open the switch-disconnector of the BatFuse and secure against reconnection.
3. Check and maintain the battery (see the instructions of the battery manufacturer).
4. Quickly connect the switch-disconnector of the BatFuse and close the BatFuse
(see the installation manual of the BatFuse).
5. Start the off-grid system.
9.7 Cleaning the Fans
If the Sunny Remote Control shows warning W137, W138 or W139, one of the fans is probably
defective or blocked. Always use the following procedure to check and clean each fan on the affected
off-grid inverter.
1. Disconnect the off-grid inverter from voltage sources (see Section 8).
2. Wait for the fans to stop rotating.
Risk of injury by corrosive and/or toxic electrolyte from the battery
If handled inappropriately, electrolyte from the battery can burn the skin or eyes or be toxic.
• Protect the battery enclosure against destruction.
• Do not open or deform the battery.
• Whenever working on the battery, wear rubber gloves, rubber boots and goggles.
• Rinse acid splashes with clear water and consult a doctor.
Risk of burns from short-circuit currents
Short-circuit currents in the battery can cause heat build-up and electric arcs.
• Remove watches, rings and other metal objects.
• Use insulated tools to mount and install the battery.
• Do not place tools or metal parts on the battery.
Battery Checks and Maintenance
Only skilled persons are suitably qualified to check and maintain the batteries.
• If you are not a skilled person, have a skilled person perform the work.
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