Victron energy BlueSolar MPPT 150/70 Manuel page 12

4.3.2. Procedure for choosing a preset charge algorithm
a. Press SETUP during 3 seconds: the "Menu" icon will light up.
b. Press the "-" or "+" button several times until the
screen shows the algorithm number (a number with
superscript "type").
c. Press SELECT: the number will now blink.
d. Use the "-" or "+" button to choose the desired
algorithm.
e. Press SETUP to confirm the change, the value will stop blinking,
and the change is made final.
f. To return to normal mode, press SETUP during 3 seconds.
4.3.3. User adjustable charge algorithm
a. Proceed as described in the previous section, and select
algorithm number 8 (USr)
b. Press the "-" or "+" button to select the parameter that
must be changed (absorption voltage, float voltage or
equalize voltage).
c. Press SELECT: the voltage will now blink.
d. Use the "-" or "+" button to chose the desired voltage.
e. Press SETUP to confirm the change, the value will stop blinking, and the change is made
final. With the "-" or "+" button it is now possible to scroll to another parameter that needs
change.
f. To return to normal mode, press SETUP during 3 seconds.
4.3.4. Other charge algorithm related settings
Absorption time: default 8 hours
Temperature compensation: default -2,7 mV/° C per cell
Equalisation:
Some manufacturers of VRLA (Valve Regulated Lead-Acid: i.e. Gel or AGM) batteries
recommend a short equalization period, most do not. Most manufacturers of flooded
batteries recommend periodic equalization.
Please see table 5 for more adjustable parameters.
Note about service life of lead-acid batteries
Flat plate VRLA batteries (i. e. all 6V and 12V VRLA batteries) as well as flat plate flooded
batteries for automotive application deteriorate quickly when discharged by more than 50%,
especially when left in discharged state for hours or days. We therefore recommend not to
discharge by more than 50% and recharge immediately after a deep discharge.
All lead acid batteries will deteriorate if not fully charged from time to time.
4.4 Connecting the solar array
After the correct charge algorithm has been selected, the controller is ready for use.
Other settings may be changed/entered before or after connecting the solar array.
Close the connection to the solar array.
If there is sufficient sunlight, the charger will automatically start charging the battery.
If, despite sufficient sunlight, the PV voltage reads 000V, please check the polarity of
the PV cable connection.
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(-65 mV/° C for a 48V lead-acid battery)