Good day Wrenches, 2025 looks to be the year for installing more grid tied (GT) battery back up hybrid inverters on new and existing GT PV systems in a whole house backup scenario i.e. Utility - Hybrid Inverter - House Loads
With these newer GT hybrids so 'sensitive', any fault on the PV side can cause them to shut down, thus stopping power to the house. To minimise this it seems sensible to add an ATS to the system such that if/when the hybrid faults, the ATS w switch to grid power, bypass the hybrid, and power the house. This could save an emergency truck roll or late night phone call for installers. Anyone have experience on good value-for-money Listed automatic transfer switches that would do the job, 200A, 120/240V? Two name brand options that came up on the less expensive end of the spectrum are: - Generac RXSW200A3 (https://www.generac.com/residential-products/standby-generator-transfer-switches/automatic/rxsw200a3/) - Kohler 200-amp, Service Entrance RXT ATS | RXT-JFNC-200ASEQS4 ( https://www.kohler.com/content/dam/kohler-com-NA/Lifestyle/PDF/PDF-g11152.pdf ) However, they each say their ATSs must be used with the corresponding generator. I would imagine a simple 'grid sense' functionality would mean that if the hybrid's output was connected to the Grid/Normal lugs and the grid was connected to the Gene/Backup lugs in the ATS it should work. However I don't want to end up with an expensive surprise in a relatively remote location where I operate! Would appreciate any feedback with experience with the above or other ATS models or how people are future proofing for this scenario? To do future maintenance/torque checks etc. in a GT hybrid whole home backup situation, it would be nice to bypass the inverter and keep the house powered for safety and homeowner convenience in general. Thanks and best. Sunniest regards, Stuart 441 599 2105
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