JOTTAELE ATS,Dual Power Automatic Transfer Switch 2P 100A 110V 50/60Hz,Changeover Switch for Generator

I used this automatic transfer switch (referred to below as the ATS) to add UPS functionality to my solar electric system. Here's how:I have plenty of solar power during the day, but at night my two 100-amp batteries are not enough to power my devices through the night.There's a solar transfer switch that monitors the battery voltage and switches to grid power when the battery voltage drops too low. At night, in the absence of solar power, it just drains my batteries down to a set point (say, 50%) and switches over to grid power. After that, if the grid power fails, the solar transfer switch won't switch back to battery/inverter power. So without the ATS, I have no real protection against power failure at night.By adding the ATS together with a time switch ("Little Grey Box" at lower left in the photo), I can use my solar power during the day, and let the ATS automatically switch to grid power at night by having the time switch turn on the grid power. At night, if the grid power fails, the ATS automatically switches back to battery/inverter power until the grid power is restored. In the morning, the time switch turns off the grid power to the ATS, so it switches to battery/inverter, now powered by the solar panels.The ATS takes about 1 second to transfer. Since I use this to keep electronic equipment online, I also use a PC grade UPS to avoid power interruption, not visible in the photo.The ATS appears to be well-built. Furthermore, the seller is fast to respond to questions. I highly recommend this item.

Practico y seguro para una casa

Muy bueno

I got this to use with solar, and also as a disconnect switch to activate when there is a storm coming. Documentation was lacking and after experimentation I found it works simply and will be useful. It's bigger than I expected.This switch would be useful for a solar installation using solar as main, and grid as reserve. Or for a backup generator you manually turn on during a power failure, with automatic (and safe) switchover once generator is turned on. Switching is fairly slow, so as others have said this won't substitute for a UPS. It replaces an interlocked set of breakers that you must switch by hand on a power event.Unit is fairly large. Decent quality plastic. Screw terminals are beefy. Manual knob turning has some resistance and won't be accidentally initiated. Unit can't be easily disasembled (I couldn't get cover to come off after releasing snaps on underside). Documentation is better ignored as it only confuses (calling main power N, which also refers to neutral, doesn't help). Following description is by trial-and-error.Unit has two separate two-pole switches, N (main power) and R (reserve power). Each separately connects and disconnects live and neutral for that side from back (input) to front (output); there is NO cross-connection between sides, which you must do (or not) on the output side. The center lever selects which side is switched on. In automatic mode, if main and reserve power are live, it rotates to N side. If only one one side has power (main OR reserve), it just rotates to that side. So you could keep solar/backup off and manually turn on inverter/generator on a power failure, and this will safely and automatically switch over to backup power (and switch back to main once it's restored). In manual mode it doesn't rotate switch, just shows status lights for power.Green block at bottom is apparently for indicator lights to put outside utility box, showing whether main or reserve power is selected and live. These output full line voltage. NOTE that neutral marking on left one (main) is WRONG. Pinout from left to right: main neutral, main live, reserve live, reserve neutral. You wouldn't be wiring lights with a common neutral anyway but this might bite you (note that the live sides are NOT connected directly to live, since only one is active at a time to indicate which side is turned on).For my use as a more secure grid disconnect over a simple switch, I wire AC to reserve side, and have a smart plug driving main power side. Then my load is ONLY connected to main power side. This way when I turn smart plug off (remotely), unit switches off main power and over to reserve. But reserve outputs aren't connected, so this disconnects both live and neutral of my load with hefty internal switches, probably better than tiny relay in smart plug.

Does what it’s supposed to and switches my camper solar system from shore power to solar batteries when I loose shore power and cab be switched to operate manually.

so far so good!!!

I buy this product because it said its 220V but its not. On the label below said 400V and does not work with 220v 60Hz. I took some time to get here so now i cannot return it and its useless for my 220v instalation.

It didn’t switch back to Source A automatically