This isn't going to be very helpful, but my 2004 Sportsmobile came with a "Specialty Concepts" "Mark PV Controller" which also went bad within a few years. The LCD readout shows garbage, but the LED good/ok/low traffic light display still works so I haven't bothered replacing it.
In any case, I would dis-recommend the Specialty Concepts solar controller monitor as a replacement
I have a 2005'ish solar panel setup with a Heliotrope display panel which isn't looking so great and is no longer able to display information properly.
Anyone have some insight on replacing this panel either with like-for-like or perhaps a better, plug-n-play option?
You can use any solar controller you want....assuming that you have a typical RV type solar panel/array on the roof. These panels are designed for 12V RV use and have an open circuit voltage around 17V give or take and they usually are 100-120W or so.
If you have a large residential house type panel (these are usually 250-300W each) then you need to run an MPPT type controller; you can't run a typical PWM cheap RV controller since these are around 37V open circuit.
I've been running this Samlex controller for years...works great.
AM solar sells Heliotrope Adapter Plate that will allow for the installation of a Blue Sky SC30 or 3000i charge controller in the the slot where an older Heliotrope model charge controller used to be. This would probabbly be the easiest way to up grade to the Blue Sky Solar Boost 3000i(MPPT) or Blue Sky Sun Charger 30 (PWM)