When upgrading from a Heliotrope controller to a BlueSky model it is also important to replace the temperature sensor.

Dimensions:  7 1/2" x 4 9/16"
Temp Sensor Replacement

Heliotrope RV-30 Series (or similar shaped brand) Replacement Options:

Solar Boost 3000i
The Heliotrope RV-30D has the ability to charge the house and chassis batteries. The most comparable replacement with that function would be the Blue Sky Solar Boost 3000i controller. The advantage of using the 3000i controller is that it features Maximum Power Point Tracking (MPPT), current boosting technology, and it has more robust wire terminals. This controller requires the panels to be within .5Vmpp of one another so it is important that your panels are the same make and model, or that you know each of your different panels’ operating voltages. 

Sun Charger 30
Another potential replacement for the RV-30D would be the Sun Charger 30. On its own, the Sun Charger 30 does not have the ability to charge the chassis batteries so it should be purchased in conjunction with a Trik-L-Start. The advantage of using a Trik-L-Start instead of the 3000i Controller is that it begins charging the chassis batteries sooner. The Trik-L-Start can begin charging at 13.2V whereas the 3000i controller, depending on the settings, usually charges at around 14.2V. This controller is also ideal for a setup where you have panels with varying operating voltages. 

AM Solar Part Number:  PLATE-ADBS