EEVblog Just like to clear up a couple things. The AC does not hiccup like that in a healthy unit. Usually such issues on the Facebook Ecoflow Delta user page prove to be user error.
The App has a number of timeout settings, and it is most likely your Delta Pro AC simply timed out. Also when it is plugged into the wall, the DP is passing through the AC input, the AC output simply reflects the AC input, it is not and cannot run off the battery plugged into the wall. This is for two reasons, one is a routing relay is flipped, and the other is the DC to AC inverter board is reversed to become an AC to DC fast charger. This is the secret sauce behind all the Ecoflow product's X-Charge extremely fast charging. It will even charge at 240V AC on the AC input even in the US models, however it will protectively mute the 120V output. Also plugged in the wall it is limited to a 20A AC passthrough, if you demand more it triggers an overcurrent warning. If your fridges sum to more than 20A, this may have been your issue.
The 3600 watts the Delta Pro is rated at are not surge/peak watts, it has 7200 "peak" watts. The 3600 watts are 120V x 30A running watts. And it will multi charge at up to 6500 Watts.
It's a beast. If your 3 fridges are typical theyare a trivial load for the Delta Pro really.
As for someone's certification questioning re: the XT60 DC input, the Delta Pro has UL, CE, FCC, RoHS, TELEC certifications.
HTH.
- Billy