Kirpal:
Thanks for that suggestion. The AP Smart system modules are certainly more compact and this is a plus for me. Do you have to have a sensor transformer and logic unit on each string? Could more than one string be routed through one sensor coil? This installation will have 10 strings so that could be a lot of hardware. Some here have asked if RSS is required on a non-dwelling unit. My reading of the code indicates indeed it is. The only buildings exempt are buildings used solely for solar equipment that are fed by ground mount arrays. So theoretically our ground mount systems that feed equipment in a barn or garage should also have RSS. Right? This does not make sense to me for protecting fire-fighters. Seems like an over-reach. Bill Brooks, could you comment on this? Anyone? William Miller Solar 17395 Oak Road, Atascadero, CA 93422 805-438-5600 www.millersolar.com CA Lic. 773985 *From:* Kirpal [mailto:solarwo...@gmail.com] *Sent:* Monday, January 31, 2022 5:21 PM *To:* RE-wrenches; William Miller *Subject:* Re: [RE-wrenches] Rapid Shutdown for Off-grid systems 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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