Tigo TS4-A-O | Optimizer | Rapid Shutdown | 1.2m MC4 cables | Up to 725W and 22A

Works well - I have one on every panel

Cons first: pretty expensive. Also the connectors are not real Staubli MC4 (kind of expected - or not given the price), AND they are not tight when you get them. So do tighten the boot using the MC4 tools. Pros: they work. The safety disconnect is great. I always use it BEFORE disconnecting at the DC circuit breakers (no risk of arcing). Takes about 3 seconds from loss of heartbeat from CCA, and a lot less if pressing the stop red switch (CCA actively tells the panels to shutdown). The recent order was for the higher-voltage version. A pretty good surprise. One out of 22 had a bad injection-molded MC4 connector. I removed it and crimped a new one. Not worth taking a chance of poor connectors mating. As for the optimizer function, I get between 11 and 17% "recovered" energy depending on the partial shading... Basically if you never have any shading, that's a waste of money. But if you do like for me, the ROI would be far in the future, but getting more energy in the same space including on cloudy days is nice. Also their reports are nice, home assistant can get the data locally... so that's really good.

Great service, product works well.