This is awesome thanks. I will have one inverter that only powers three minisplits and I want to make sure if the inverter switches to grid in the middle of the night it doesn't shut off the units. This is promising.
Yeah. I have looked at it multiple times. I just can't come up with a scenario where any data would cause me to change anything I'm doing. It would be interesting but not really very valuable. I'm all for the cool factor but I'm saving up for more batteries and upgrading inverters! ?
As of yesterday rackupgo had it for $1000, battery $700. Some research suggests they are absolutely legit. Based in north dakota with distribution centers across america.
I think mine has a setting for increased dehumidification. If I remember correctly it is a matter of the condenser coil being below the dew point of the air. Others with more specific knowledge can probably elaborate.
Ecoflo.ca sells them for,1400CDN
Yeah if you already have your solar system it may not be as valuable but for someone like me who is trying to size the system it's invaluable.
The efficiency hasn't changed. Only the rating system.So I Googled that SEER2, the new efficiency ratings, would be about 5% lower. However, all the super high SEER mini splits are getting knocked way down. Anybody know the particulars of why these are so affected??
Just an EXAMPLE, not stepping on YOUR toes if this is yours
38 SEER vs 27 SEER2 that's a hell of a lot more than 5%
Certainly - but the perception is these high-SEER mini splits were gaming the rating system via essentially some "loophole" (partial output, etc??) that's now been closed?
I don't know. That's certainly a possibility but I thought the SEER rating was a pretty basic formula. Number of BTUs of heat removed divided by wh. Maybe there's a way to game that. SEER2 uses the same math but uses more precise measuring standards, as I understand it. I think SEER2 also factors in heating capacity so it would only apply to heat pumps, right? As long as you use the the same standard for comparison I doubt if it's going to much change the difference between one brand and another. But it's not my area of expertise.
That would be cop, not seer or eer
The low efficiency units also have very powerful fans that how through anything. With inverters, they use weak fans so you have to be very intentional about designing the ductwork and filter system. My 2 ton ducted inverter uses 2x 20x25 filters
I'm just going by the resources I've used. Really, my only contention is that changing the rating system doesn't change the machine. If you bought a brand X model Z heat pump with a 20 SEER rating and their new rating shows it with an 18.5 SEER2 the unit hasn't changed, just the rating system.
I was wrong about the calculation-it is indeed eer. I thought eer had to be a specific temperature but that's not really correct. Heck I don't know- I know almost as little about HVAC as I do about solar ?I'm just going by the resources I've used. Really, my only contention is that changing the rating system doesn't change the machine. If you bought a brand X model Z heat pump with a 20 SEER rating and their new rating shows it with an 18.5 SEER2 the unit hasn't changed, just the rating system.
But regarding COP and SEER, this is what I found, FWIW -
The SEER rating is calculated by dividing the total number of BTUs (British Thermal Units) of heat removed from the air by the total amount of energy required by the air conditioner in watt-hours. The higher the ratio, the more energy efficient the air conditioner is.
And this -
There are four heat pump performance measures: coefficient of performance (COP), energy efficiency ratio (EER), seasonal energy efficiency ratio (SEER), and heating seasonal performance factor (HSPF)
COP is the ratio of the output power to the input power, that is,
(COP=outputpower / inputpower
COP, which is a dimensionless number, is therefore a measure of efficiency; the higher the number, the more efficient the heat pump is.
The EER is the ratio of output cooling energy (in BTUs) to electrical input energy (in Watt-hour).
EER=outputcoolingenergyinBTU / inputelectricalenergyinWh
Therefore, it has dimensions of BTU/Wh. It is also noted that it is measured over time.
The SEER is the ratio of output cooling energy (in BTUs) to electrical input energy (in Watt-hour). SEER is a measurement of how the system behaves over a season where the outdoor temperature fluctuates.
SEER=outputcoolingenergyoveraseasoninBTU / inputelectricalenergyoverthesameseasoninWh
HSPF is a measure of the efficiency of a system and the units are the same to that of the SEER. HSPF, however, measures the efficiency of the system in heating mode, not in cooling mode.
At the end of the day, all I can tell you for certain is that my ducted mini-splits are keeping the house much more comfortable and at a consistent temperature than my 10 year old heat pumps were, and at something around 25% less consumption so I'm happy as a clam. More importantly, wife is happy too.
Are clams happy? Never mind - a topic for another day.
I'm nothing resembling an expert on either myself.
I know. But I'd rather spend the money on more solar stuff!
Like the chargeverter I just ordered a few minutes ago. It never ends.
There were several factors that pushed me to Mitsubishi but efficiency overall was definitely one of them. Reliability was another.
Just over 1 month and it's still running like a champ.
