Renogy MPPT20CC - Protections, Troubleshooting and Maintenance; 5.1 Protection

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Battery Type Setting
When the Battery setting indicator is on, press the “Setting” button and hold on 5
seconds until the battery type LED turns on. The led will be flashing. Continue to
hold and the number will repeat from 1 to 3, and stop pressing until the desired
number appears according to the following setting table:
Battery type
Digital display
Sealed lead acid battery
1
Gel battery
2
Flooded battery
3
Table 4-8 Battery type setting