IMO Technical Brochure

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7
Dual String System – 5kW Output Single Phase
Consider a typical 5kW system which would supply 22A at 230VAC:
Inverter: Input (per string): 600VDC (V
OC
), 18A (I
DC
), 36A (I
DC max
) Output: 230VAC (V
AC
), 25A (I
AC max
)
Solar Panel: 64.9V (V
OC
), 6.46A (I
SC
), 5.98A (I
mpp
), 327Wp (P
nom
) No. of panels: 8 per string
Calculation: V = 8 x 64.9 x 1.15 = 597.08V I = 6.46 x 1.25 = 8.08A
For this conguration, each string is to be switched at these levels so the IMO SI16-PEL64R-4 rated at 16A for 700VDC per string is
suitable for the DC switch and the PE69-3025 rated at 25A is suitable for the AC switch.
DC Isolator Inverter AC Isolator
SI16-PEL64R-4 5kW PE69-3025
PV Arrays
+ + + +
- - - -
+ + + +
- - - -
L
N
E
Existing AC
Equipment
L
N
E
+ + + +
- - - -
+ + + +
- - - -
High Voltage Multi-string System – 12.5kW Output Three Phase
Inverter: Input (per string): 900VDC (V
OC
), 18A (I
DC
), 36A (I
DC max
) Output: 4000VAC (V
AC
), 20A (I
AC max
)
Solar Panel: 64.9V (V
OC
), 6.46A (I
SC
), 598A (I
mpp
), 327Wp (P
nom
) No. of panels: 12 per string
Calculation: V = 12 x 64.9 x 1.15 = 895.62V I = 6.46 x 1.25 = 8.08A
For this system there are several options to consider. If each string is to be switched individually then the SI25-PEL64R-2
rated at 11A for 1000VDC is suitable for the DC switch. If there is a requirement to isolate the strings as pairs then the
SI25-PEL64R-4 is suitable. If all strings are to be isolated using one DC isolator then the IMO SI25-PEL64R-8 is suitable. The
PE69-3025 rated at 25A is suitable for the AC switch in each case.
Alternatively, if the requirement is to still have the capability of isolating each string individually whilst retaining a single housing unit, then
an IMO distribution box populated with SI25-DBL-2 is suitable. These devices use the same switch block as the SI25-PEL64R-2 so have
the same rating of 11A at 1000VDC.
This document is meant as a guide and IMO Precision Controls shall not be liable in any event whatsoever for any indirect, special or consequential damages, arising out of the use of the products
covered by this document at any time or howsoever caused by the goods. IMO Precision Controls excludes any warranty, condition or statement, express or implied, statutory or otherwise, as to
quality, merchantability, or tness of the goods for any particular purpose.