Solar Panel, Power & Battery Discussion

[DC3]

Actually it changes from 10yrs unlimited kWh to 37MWh

Probably best not to export to the grid.

 

[DC3]

Unfortunately, the shape of our pool provides significant challenges to the installation of a pool blanket.

The 1970s kidney-shaped, or the modern octagon?

 

[Quickstatus]

Probably best not to export to the grid.

Export to grid no problem but using it as a VPP changes the warranty from years to MWh

 

[DC3]

Export to grid no problem but using it as a VPP changes the warranty from years to MWh

That’s probably what I was trying to recall

 

[Quickstatus]

Though if full cycling once a day for 1 year thre throughput is also about 37MWh.

1 cycling per day because Tesla assumes the resident uses solar to charge the battery once a day. But potentially users can charge twice a day - once using solar and once using overnight off peak at 8c/kWh

 

[NM]

The 1970s kidney-shaped, or the modern octagon?

1980s kidney-like shape, I guess. Certainly not modern. Back when proper pools were tiled.

 

[Quickstatus]

48kWh battery (6 modules of 8kWh) with 25kW inverter at the top

Over 2m high

 

[cove]

How much was that box @Quickstatus.

 

[Quickstatus]

$21K after Government carrot. Before government carrot $37K
Includes installation and gateway for blackout function the whole system is modular - can add several of these in series

@cove there are commercial versions

Each module of 8kWh has 23,000 warrantable kWh or 10 years 70% degradation whichever occurs dirst

So 23x6 =138 MWh or 138,000 warrantable kWh

Simplistically allowing for opportunity cost of 6%.
The sunk cost of capital = $28,000
28,000/138,000 =0.203

Cost of energy storage = 20.3c:kWh

But true cost of battery energy = cost of energy to charge battery plus cost of energy storage.

If cost of charging = 5c/kWh from solar then cost of battery energy = 27c/kWh

.....

The batteries charge/discharge at 50% of nominal capacity. 8kWh battery charge/discharge at 4kW. So dimension the inverter with that in mind

 

[cove]

I hope it didn’t replace the beer fridge.
With the commercial buildings that we own we will wait for the tenants to take up their options before we consider doing some special stuff for them next year.

 

[Quickstatus]

Could have put in a second one easily in series but government carrot not enough to make 2 financially viable.

 

[exceladdict]

Bumping this thread, I've been working on a simple app to calculate whether a battery is a viable add on for someone with existing solar, using actual usage data rather than the very generous estimates and averages often on solar providers' websites. In other words, if I had a 10kwh battery, how much would my costs have changed in the last year, considering all of the factors raised in this thread (degradation, energy loss, depth of discharge limits, etc).

If anyone in WA is asking the same question and or would like to run their numbers through the system please send me a DM. Would be great to have a few more cases to test, especially for people on different tariffs. Assuming you have a smart meter, you can download your usage in half hourly increments from synergy, and there's no identifying data needed.
Open to building in other states too, but nothing the retail environment and tariff structures are a little more complex so haven't gone there yet.

 

[kookaburra75]

Bumping this thread, I've been working on a simple app to calculate whether a battery is a viable add on for someone with existing solar, using actual usage data rather than the very generous estimates and averages often on solar providers' websites. In other words, if I had a 10kwh battery, how much would my costs have changed in the last year, considering all of the factors raised in this thread (degradation, energy loss, depth of discharge limits, etc).

If anyone in WA is asking the same question and or would like to run their numbers through the system please send me a DM. Would be great to have a few more cases to test, especially for people on different tariffs. Assuming you have a smart meter, you can download your usage in half hourly increments from synergy, and there's no identifying data needed.
Open to building in other states too, but nothing the retail environment and tariff structures are a little more complex so haven't gone there yet.

I'm in the ACT where we have a limited list of providers, so I'd be in if that would help spread your wings for the app

 

[cove]

We are ineligible for government carrots on solar.
Solar and LED saved us a lot of money and that started around 2014 and goes on.

 

[daft009]

WA seems to be quite a closed market?
I feel battery is great if you can tap into wholesale power with Amber electric

I charge my battery with solar and the grid during the day at 6-12c/kWh and then sell at 50c-$20/kWh during the evening peak

Works quite well at my office too as we close at 5pm so a lot can be sold to the grid to improve ROI