RST050
INSTALLATION
&
USER
MANUAL
14
Cumulative Discharge
The following is applicable to installations where the RST050 is only charged for a
portion of every day such as would be available with solar power.
Should the RST050 be operated in such a manner that the energy withdrawn from
the batteries exceeds the energy required to replace the lost charge, the batteries will
continue to discharge over several cycles. Whilst this may seem obvious, it may not
be apparent to the operator and or installer until some time after commissioning.
The batteries do not supply energy to the load while the power source to the RST050
is present .
The following table shows the remaining operating hours at the end of each day for
the RST050 under conditions of permanent 22+2 RST100 load for different charge
periods. It is assumed that the RST050 starts the first day with 100% charge and that
charging takes place around the middle of the day.
Elapsed Days
1 2 3 4 5
1
4.5
- - - -
2
8 - - - -
3
12
(0) - - -
4
16
(8.5)
- - -
5
20 16.5
(12.5)
(8.5) -
Charge Period
(Hours)
6
24 24 24 24 24
In the above table:
•
Bracketed quantities indicate that the battery was over-discharged,
•
The minus sign indicates operation that has insufficient charge to return to
zero net energy loss at the start of the day.
The above table shows that at least 6 hours of charging is required each and
every day to meet 22+2 load requirements for the RST100. Longer operational
time, at the expense of standby time will require an increase in charge time.
