SUNNY ISLAND 5048 - Technical Description - Wind & Sun Ltd.
SUNNY ISLAND 5048 - Technical Description - Wind & Sun Ltd.
SUNNY ISLAND 5048 - Technical Description - Wind & Sun Ltd.
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SMA Solar Technology AG Battery Management<br />
The battery's state of health (display value "320.01 Soh") is a measurement of the present useable<br />
capacity expressed as a percentage relative to the nominal capacity. 100 % means that the entire<br />
nominal capacity can be used. 50 % means that only half of the original nominal battery capacity<br />
can be used. The battery's state of health is also calculated by means of a self-adapting method which,<br />
however, can only produce good and exact values after a number of charging cycles.<br />
The present capacity for the <strong>Sun</strong>ny Island is automatically adjusted downwards for temperatures <<br />
20 °C, since the usable capacity of batteries is significantly reduced at temperatures below the<br />
nominal temperature.<br />
In case of lead acid batteries, the nominal capacity is adjusted by a fixed factor of –1 %/°C.<br />
For NiCd batteries, a factor of –0.75 %/°C is used.<br />
13.4 Charge Control<br />
The <strong>Sun</strong>ny Island uses a 3-phase charge control, using the IUoU procedure. When operating with the<br />
power distribution grid, a fourth level, Silent Mode, is optionally available.<br />
The I stands for the constant current phase (I phase). In this phase, the charging is limited by the<br />
maximum defined battery current (parameter "222.01 BatChrgCurMax"), the nominal grid current<br />
(parameter "232.03 GdCurNom") or the maximum AC charging current of the <strong>Sun</strong>ny Island<br />
(parameter "210.02 InvChrgCurMax"). The respective value reached first is the limiting value.<br />
During this phase, the battery voltage increases as the battery is charged.<br />
Once the battery voltage reaches the predefined value for the second phase Uo<br />
("222.07 — 222.09", ChrgVtgBoost or ChrgVtgFul or ChrgVtgEqu parameters), the constant voltage<br />
charging (absorption phase) begins.<br />
<strong>Technical</strong> <strong>Description</strong> SI<strong>5048</strong>-TB-TEN110340 99