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3.3 Commencing a new charge cycle
A new charge cycle will commence when:
i.
Bulk stage is complete and the current output increases to the maximum charge current
for four seconds (due to a simultaneously connected load)
ii.
If re-bulk current is configured; the current output exceeds the re-bulk current in float or
storage stage for four seconds (due to a simultaneously connected load)
iii.
The MODE button is pressed or a new charge mode is selected
iv.
VictronConnect is used to select a new charge mode or change the function from ‘Power
Supply’ to ‘Charger’ mode
v.
The AC supply has been disconnected and reconnected
3.4 Estimating charge time
A lead acid battery is at approximately 80% state of charge (SOC) when the bulk charge stage
is completed.
The bulk stage duration
T
bulk
can be calculated as
T
bulk
= Ah / I
, where
I
is the charge current
(excluding any loads) and
Ah
is the depleted battery capacity below 80% SOC.
An absorption period
T
abs
of up to 8 hours may be required to fully recharge a deeply
discharged battery.
For example, the charge time of a fully discharged 100Ah battery when charged with a 10A
charger to approximately 80% SOC is
T
bulk
= 100/10 = 10 hours.
Including an absorption duration of
T
abs
= 8 hours
,
the total estimated charge time would be
T
total
= T
bulk
+ T
abs
= 10 + 8 = 18 hours.
A Li-ion battery is more than 95% charged at the end of the bulk stage and reaches 100%
charge after approximately 30 minutes of absorption charge.
