Tesla Powerwall - battery for your house

Quote:

---

Originally Posted by Eevo

got a quote today for installing a tesla powerwall for the house. 14.1k!
wont even pay itself off in the warranty period.

---

How many kw?

Quote:

---

Originally Posted by Eevo

13.6 years break even.

2 years ago i got a quote for 9k, and i wasnt worth it back then. maybe i was wrong.

---

Well my quick calculation in my head wasn’t far off then. 👍

Quote:

---

Originally Posted by 101RRS

How many kw?

---

13.5kWh

Quote:

---

Originally Posted by Eevo

13.5kWh

---

So about twice the cost of a bank of AGM batteries of about the same useful capacity - following on from another recent thread - why does a house need lithium batteries when size and weight is not an issue.

A Tesla power wall does look pretty though.

Garry

Quote:

---

Originally Posted by 101RRS

So about twice the cost of a bank of AGM batteries of about the same useful capacity - following on from another recent thread - why does a house need lithium batteries when size and weight is not an issue.

A Tesla power wall does look pretty though.

Garry

---

Well, many, if not most, cars are sold mainly on looks, so why not batteries?

Quote:

---

Originally Posted by 101RRS

So about twice the cost of a bank of AGM batteries of about the same useful capacity - following on from another recent thread - why does a house need lithium batteries when size and weight is not an issue.

A Tesla power wall does look pretty though.

Garry

---

Lithium does have a longer life though, but I don't think we quite know lifespan yet despite the claims - I want to see how long they last in the real world. I'm hopeful that sodium ion batteries start to get more mass produced which will bring their cost down significantly for this sort of application and give the longevity of lithium with the cost of AGM or even cheaper given the readily available materials required to make them. Biggest drawback is size and weight, but for fixed installations would be a winner. I think most people only know of the Lituim tech as this is what is widely used in EV's etc, but they a waste of money and resources for fixed installations IMO.