Hi William. We have had good luck with the AP Smart Rapid shutdown system. It is similar to the Tigo in that it sends a "heartbeat" signal to the units up behind each solar panel over the power wires. I haven't tried the Tigos yet but would be open to it if the opportunity presented itself. The thing we like about the AP Smart shutdown units is they can be attached to the solar panels before the panels are brought up to the roof. Makes for a quick and tidy installation. We found the Fire Raptor units with their incredible amount of extra wiring and cables to be a real pain in the ass to install. It typically takes longer to install the Fire Raptor units and manage the wiring than it does to install the solar panels themselves. The fire raptors are more expensive and require a seperate control wire to be run upto the roof. We haven't had any failures on either the fire raptor or the AP Smart units with probably a dozen installs of each style installed to date. Brad Bassett at AEE has some great easy to use wiring diagrams for both systems with Outback or Sol Ark. All the above systems have some requirement for either 12V or 24V power to power the signal generator. We typically use some version of din rail mounted 48-24v or12V power supply and power it from the batteries so that if the inverter were to fail or the grid the solar can still stay on.. At this stage we have settled on any of the rapid shutdown systems except Fire Raptor. - if you do use the Fire Raptor - calculate a bunch of extra time into the install for wire management. Hope that gives you some food for thought. Cheers,
Sunny Regards, Kirpal Khalsa Oregon LRT#25 Oregon Solarworks LLC www.oregonsolarworks.com 541-299-0402 > >
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