Vigo
Solar Addict
Wow, im glad to have come across this. I don't have any medical devices or even any 'real' need for a UPS but i have considered buying one of these just because the price is honestly good enough that it falls into my 'discretionary spending' range of not really having to have a bulletproof reason for buying it. It just seems cool! But im not willing to swallow much 'hassle' from a device i don't need to begin with, so.. i'll be watching this issue now!
It does sound like something having to do with its AC input and how it uses or reacts to that. And if so, considering that the issue seems to be irrespective of loading on the AC output, it would just come down to poor design as far as how the device handles 'inconsistencies' on the AC input side. It's a device marketed largely on UPS-type functionalities, so being intolerant of 'dirty power' on the ac input is just.. bad planning and bad design!!
So that raises the followup question... since the EB3A can accept a 12-28v dc input, and the output load that needs to be powered in OP's case is small.. is it worth testing that a small DC power supply which is at least capable of supplying the CPAP's power requirement plus preferably a little extra, such as a laptop charger or several varieties of ~$20-30 bench PSUs, might totally bypass this crappy side-effect of the ac input? It would force the unit to operate in true 'double conversion' where it would be more isolated from any weirdness on the local grid.
You know, like it's supposed to be in the first place.
Bluetti should still fix this, even if a low cost low effort solution IS found. Because it shouldn't be doing this in the first place. And as a possible 'loss leader' product that is probably supposed to getting a bunch of new customers on the Bluetti hook, it would be especially ironic if they lost money on it AND it had the opposite effect on their 'brand'.
It does sound like something having to do with its AC input and how it uses or reacts to that. And if so, considering that the issue seems to be irrespective of loading on the AC output, it would just come down to poor design as far as how the device handles 'inconsistencies' on the AC input side. It's a device marketed largely on UPS-type functionalities, so being intolerant of 'dirty power' on the ac input is just.. bad planning and bad design!!
So that raises the followup question... since the EB3A can accept a 12-28v dc input, and the output load that needs to be powered in OP's case is small.. is it worth testing that a small DC power supply which is at least capable of supplying the CPAP's power requirement plus preferably a little extra, such as a laptop charger or several varieties of ~$20-30 bench PSUs, might totally bypass this crappy side-effect of the ac input? It would force the unit to operate in true 'double conversion' where it would be more isolated from any weirdness on the local grid.
You know, like it's supposed to be in the first place.
Bluetti should still fix this, even if a low cost low effort solution IS found. Because it shouldn't be doing this in the first place. And as a possible 'loss leader' product that is probably supposed to getting a bunch of new customers on the Bluetti hook, it would be especially ironic if they lost money on it AND it had the opposite effect on their 'brand'.