Owner`s manual

30
The strength of the blades, particularly at the root (inner) end, may degrade over time due to flexure and
UV degradation of the fiberglass material. The symptom of degradation is a reduction in blade stiffness
fore-and-aft. The blades have to become very flexible in the fore-aft direction before there is any risk of
tower strikes during severe weather. We recommend that you check blade stiffness about every 10 years
and replace the blades if they become extremely flexible.
PowerCenter Fuses
The PowerCenter has four fuses. If you blow (fail) one or more of these fuses you may replace them
using the following specifications and parts identifiers (P/N means part number):
Battery Fuse: 90-amps; Buss P/N JJN-90 or Little Fuse P/N JLLN-90
Turbine Fuse: 70-amp or 75-amp; special order because of the L-shaped mounting tabs, but you can
use a Buss P/N JJN-70 or Little Fuse JLLN-70 by also installing 2 x M6 brass nuts per post (before plac-
ing the new fuse) to accommodate the straight tabs on the stock fuse.
Dump Load Fuse: 60-amp or 63-amp; Buss P/N JJN-60L or JJN-60, or Little Fuse JLLN-60, using 2 x
M6 brass nuts per post as described for the Turbine Fuse.
Solar Fuse: 30-amp: Buss JJN-30L or JJN-30, or Little Fuse JLLN-30, using 2 x M6 brass nuts per post
as described for the Turbine Fuse.