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

Will do Scott. My Circle Labs A200 pulls 75 watts at idle and 400 watts peak! My total system draw is around 500w peak/max. I will need something powerful enough to run my system 10 hours continuos. I need the BLUETTI AC300 Inverter Module Generator | 3,000 and perhaps two B300 batteries. Perhaps one battery will do as my system is not running at peak. May do it!

Much less expensive than Stromtank!

Great post Scott! 

Bill - I’m sure you will do your own research but just make sure to buy one that more than meets your system power requirements and can handle the initial power surge of your amp (not sure what your current system is).  The inverter should remain stable at 120v and 60HZ even under full load.  Also look for one with heat sinks in addition to just cooling fans - to keep the fans off under normal usage.  Bluetti seems good to me but there are probably better ones out there. Scott

Check out the hobotech reviews on YouTube. All inverters are not the same.  Rockpals has gotten some fairly bad reviews for inverter noise and voltage stability, sorry.  Bluetti and Ecoflow make quality units but they cost more.  Mine was $1,800.  

Mine is rockpals 300W, around $500. Certainly mine is lower wattage, less expensive, but are you paying for better parts quality, inverter with higher watt versions of same basic design. I presume these all built in China, same factory or factories, similar parts quality.

So, I opened mine up, certainly not what is considered audiophile parts quality, just mass produced, common household electronics quality. I was thinking about modding with better wire, outlets, even then still left with cheapo circuit boards, inverter.

I very much doubt I was over loading inverter, rounding off transients. The most wattage draw I ever saw was 55w.

I presume Stromtanks priced in accordance with the quality of parts contained within. I do believe there is great potential with battery power supplies, I just don't think one can get by cheaply here. Presumably more of these devices will come to market in coming years, hopefully some will be audiophile quality.

@sns 

What battery system did you use? Perhaps not as good as what  @sbayne is showing here? 
 

This is most interesting to me.  I am building a new home and think something like this would be better than time and money spent on direct AC lines and power conditioners. 

Mine is newer unit, lithium ion, mid price range of these.

sns - no doubt parts quality is important especially the inverter. The cheaper ones can't maintain a consistent voltage under load and the sine wave begins to breakdown. Obviously, avoid those. There are some excellent online reviews since these new lithium ion portables are big amongst the camper/RV crowd. 

I've tried battery power on previous dac and various streaming component lps.  Limitations include inverter and just general parts quality of these devices. Versus my BPT 3.5 Sig isolated transformer pc, battery power had darker more veiled sound quality, transient attack blunted.

jbs - Yep, totally agree the quality of inverter is very important. I’m just going by the numerous reviews of the Bluetti on the internet. The link I provided is probably the most thorough and indicates the inverter is very quiet. I’ve detected no extra noise.

theaudioamp - makes sense its not converting from DC.

No inverter in PS audio units. It appears to generate a voltage just above the input AC that follows the AC then uses a linear amp to make the output.

I have a off grid home so it uses a bank of batteries which then go thru a whole house sized large inverter (Schneider). The inverter is where one can get noise and I have not tested mine. With that said there is virtually no noise in the system but I am also using differentially balanced gear. Super happy with the sound and whole house setup.

Right. Same concept as the PS Audio PP since it generates a 120v/60HZ pure sine wave from its inverter - except mine is coming off a battery.

It would be interested having one of those to compare with my PS Audio PP.

Other than being truly  "off the grid" supplying the AC for the system, same principle. 

Looks like a less costly one too.

I see you have a pair of "that brand" speakers. The threads are entertaining.