Fronius IG 15 - Manual (Page 32)

24
isolation resistance of photo-
voltaic generator (MOhm)
* module temperature ... tem-
perature at solar modules
(degrees centigrade; can also
be set for degrees Fahrenheit;
temperature sensor No.1;
sensor card optional)
module power ... power supp-
lied by solar modules at the
moment of data display (Am-
pere)
The FRONIUS IG unit keeps the module voltage always within the range
of the maximum possible power withdrawal from the solar modules. This
results in the optimum for the module electricity.
Isolation resistance is the resistance between the positive pole or the
minus pole of the photovoltaic generator and the grounding potential.
Whenever an isolation resistance higher than 500 kOhm is shown, the
photovoltaic generator is sufficiently insulated.
Warning! An isolation resistance < 500 kOhm can be caused by an
insufficiently insulated DC cable or by defective solar modules. In
case of an insufficient isolation resistance you must in any case
contact your Fronius service partner.
Important! Only an isolation resistance of less than 500 kOhm indicates
that there is an error. Whenever a higher insulation reistance is shown it is
not to be interpreted as an error.
Whenever there is an isolation resistance of less than 10 MOhm, the
display differentiates between the negative potential and the earthing
(minus sign „-“) and the positive potential and the earthing (plus sign „+“)
module voltage... voltage in
the solar modules at the mo-
ment of data display
The voltage indicated during power supply into mains is equal to the so-
called MPP voltage (MPP = maximum power point). The FRONIUS IG
unit keeps the module voltage always within the maximum possible power
output withdrawal from the solar modules. This always guarantees an
optimum efficiency performance of your photovoltaic generator..
Display mode
„Now“
(continued)