bkp_duke
Well-Known Member
Urban Solar Group told me they can give me a quote for LG RESU system. I'm really tempted to go with the LG RESU mainly because of its efficiency and good things I read about it, but the price tag is higher:
Here's How LG's Solar Battery Stands Up To the Powerwall
There are some factual inaccuracies about that article related to the PW2.
Depth of discharge is not 100%. The PW may say it has hit 0% on your app monitoring, but there is an inaccessible reserve that the wall keeps. I've seen this firsthand and it can be monitored on the PW website if you access the IP directly.
Also, it is a bit deceptive how they comment that the LG is a smaller form factor, but requires an external inverter (facepalm). Apples to apples please.
EDIT - and that 95% efficiency, is that ROUND TRIP? I.e. AC (solar, in my case microinverters) --> DC Powerwall Storage --> AC discharge. That's exceptionally high for a round trip. This website says "greater than 90%" - LG Chem RESU 9.8 kWh Lithium Ion Solar Battery Backup Solar Battery Something like 92% would be exceptional for roundtrip.
EDIT 2 - I found it!!!
http://solarjuice.com.au/wp-content/uploads/2016/10/160712_New-RESU-leaflet_Global-small.pdf
That is a 95% DC roundtrip efficiency, not AC to DC to AC like the powerwall. Not an apples to apples comparison at all. Add in that final inverter to get the DC current back to usable AC, and the LG and PW2 are likely a wash at around 90%.
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