Not familiar with the 2003 Executive but my solar monitor is located near my RC7 controller which makes sense as all the power monitoring for 12VDC is in one place.
My 2002 Windsor came with the Solar option, attached below is the parts breakdown.
The previous owner also added 2each 125 watt panels so I have 335 watt total charging capacity. There is marginal room for 1 more panel.
I had to replace the 2 newer panels under warranty, they were Kyocera panels. I was having problems with them early on (2009) and contacted the factory about the RV30DB controller thinking that was the problem and they told me to check with Kyocera as they had panels of that vintage they were still honoring the warranty on (no cost to me at all).
I did have to replace the buss bars under the refrigerator hood, all the wires were corroded so I redid the whole thing, the system is still working good giving me ~15 amp of charging under load on a sunny day.
Good luck on your install, if this is a new install I would go with as much solar you think you can afford. The cost seems to have come down to make it worthwhile, especially if you boon dock.
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Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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