Using battery power to go off the City's power grid

Ok, here are results of the Entech Wideband Power Analyzer I recently got to check out the noise on my house power lines v. the Bluetti AC200MAX. Its rather humorous but remarkable! I assume if I got a Puritan 156 it would take the noise reading down to zero.

Thanks for sharing on video.  Fun tool to play around with for $40. I have multiple conditioners on 2 systems and 2 solar battery (48v AGM) backup outlets with different inverters that I can use it on to compare results.  Should be fun to hear the  results.

Cool little toy.  The Puritan is so low in noise that it won't even measure on that thing......but a single measurement does not mean that much by itself.  I am going to change the outlets and inlet and wire on my friends Puritan on Wed. because people have already done this and said it "sounded better"......the different jacks and wire will not make it measure any different......most things that make for better sound cannot be measured.  You could have two inverters that measure quite similarly but sound radiclally different.

Some of you could skip over all of the hassle of setting up separate components of batteries and inverters by simply purchasing UPS' which contain both of these components all in one package. Many models include metering too. Here's the thing about UPS' - there are typically two types; standard (or line interactive), and double-conversion. A standard UPS only transfers power to batteries when a power outage is experienced. In this situation, one specification to note is transfer time. That is the time it takes for a standard UPS to switch from utility power, to battery power. Sometimes that time can be 10 milliseconds, or higher. In a typical broadcast application (I'm a former Radio Broadcast Engineer), I used UPS' in many broadcast situations to momentarily supply power to broadcast gear, until a generator kicked in (after the loss of utility power) and took over. Sometimes this 10 millisecond (ms) transfer time was not quick enough, so many pieces of electronic microprocessor based equipment would lock up. What a pain. I then began using double-conversion type UPS'. This is a type of UPS that is *always* on battery power, with no transfer time. It sounds like with all of the batteries and inverters you're setting up, you're in a way creating a double-conversion UPS. Lead-acid batteries were the norm with UPS', but now many are utilizing Lithium Ion batteries. Here's an example of a double-conversion UPS:

UPS' come in a wide range of volt-amp outputs (easily converted to watts via website volt-amps to watts calculators). Another added plus of a double-conversion UPS is since it's always on line, it protects your equipment during momentary (and longer) utility power outages. All of my home audio equipment (TV's too) has been on a double-conversion UPS for years now. A word of caution though if you go searching for a double-conversion UPS; make sure to read the fine print. Some manufacturers use different terms for double-conversion. Key words being - no transfer time. 

@jollygreenaudiophile2 mentioned a flywheel type system. Just in case some of you wanted to take a look at this type of energy storage system, here's one that I'm aware of (BTW, you can click on the link on the right hand side for a tutorial):

https://vyconenergy.com/products/ups/vdc-products/

I believe these are mainly used in data centers (and other broadcast applications) to cover the building load, while a generator is ramping up to full voltage, which will then take over the building load. I've never used one, or been part of a facility that had one, but it looks like they can take the place of many UPS'.