Tesla Model PW2

[rusdy]

I just bought a Tesla... model PW2:



Wheel added so that it can fit to a car forum .

I say I'm impressed on how Tesla can bring the cost down (although still not reachable to most). For full install, with 13.5kWh usable capacity and with 5kW inverter with both on and off-grid capability (seamless transfer), at less than a dollar a watt, is definitely a game changer.

It's actually smaller and much lighter than our first gen Leaf batteries (with same usable capacity by now). I hope there will be an Aftermarket install, simply bolt on to the Leaf gen 1 battery compartment  .

Full review of mine here. 

[Phoebe]

Interesting!  Much more complicated than my LG 6.4kw battery, Sungrow Inverter with Ethernet WiFi connection to Laptop and smart phone and 3kw solar panels.  This actually provides for all my needs including charging my LEAF.  More than that, I export so much to the grid that last quarter I got a $12 refund from AGL.  I expect you use a lot more power than I do.

[rusdy]

Nov 13, 2017 15:35:10 GMT 11 Phoebe said:

Interesting!  Much more complicated than my LG 6.4kw battery, Sungrow Inverter with Ethernet WiFi connection to Laptop and smart phone and 3kw solar panels.  This actually provides for all my needs including charging my LEAF.  More than that, I export so much to the grid that last quarter I got a $12 refund from AGL.  I expect you use a lot more power than I do.

Hi Phoebe, you're right. My household electricity consumption is quite heavy. Total in the last 365 days is (real data, as I'm a data hoarder):

• Total usage (consumed from grid + solar) = 5.5MWh, or 15kWh a day in average;
  
• Total usage (consumed from grid only) = 4.3MWh, or 12kWh a day in average (this is mainly due to I charge the car at night);
• Total export (sell to grid) = 3.1MWh, or 8.5kWh a day in average (which valued by retailer at 7 cents per kWh).

I've calculated the PW2 ROI for my case (unique to mine), and it's more than 20 years. So, definitely my unhealthy addiction to battery power + inverters rule the purchase decision making  .

[Phoebe]

My normal daily use (grid + solar) is 4 - 6 kwh excluding charging my LEAF, and except on a cloudy day in mid winter that doesn't involve any from the grid.  I charge my LEAF about once a week, during the day, and I usually pick a sunny day, so that doesn't use any from the grid either unless I can't find a sunny day within the time frame I need.   All a very different situation to yours. My ROI is probably less than yours but I'm in my mid 70s so I may not last long enough to see it

[EVangelist]

Nov 13, 2017 16:17:40 GMT 11 rusdy said:

My household electricity consumption is quite heavy. Total in the last 365 days is (real data, as I'm a data hoarder): Total usage (consumed from grid + solar) = 5.5MWh, or 15kWh a day in average;

My household consumption is heavier: 9.12 MWh or 25 kWh per day, with a peak in Winter of 35 kWh/day and a minimum in Autumn of 18 kWh/day.  We have a very energy inefficient house, which we wan't to do something about next year (installation of a lot of double glazing), but that will cost a lot.

We don't have solar (yet) - our roof is relatively small, steep, and inaccessible without scaffolding.  A maximal solar installation of 16 high efficiency panels, given our location and orientation, would generate about 8.4 MWh per year, or about 90% of our current annual consumption.  The generation peaks would not coincide with consumption though - the minimum solar generation would be in May at 12 kWh/day (67% of current consumption at that time of year) and the maximum would be in October at 19 kWh/day (106% of consumption).

A battery might be in order since our biggest issue to solve is consumption time-shifting since most of our consumption is late afternoon/evening, but I need to crunch the numbers.

If we can improve our house energy efficiency by about 25%, then we should get close to "off grid" in net terms given the various temporal mismatches, but the arrival of Tesla Model 3 in 2019 will push our consumption up again by about another 1 MWh.