New garage time!

[fatjay]

You going to paint these?

I wasn't planning to. They're going to have 200+lb batteries just sitting on them.

 

[sodamo]

90kwh, I’m envious with only 57kwh. We use 35-40 per day.
You have a link for those batteries?

I likely would have painted before assembly as I know I wouldn’t after in operation.

 

[fatjay]

90kwh, I’m envious with only 57kwh. We use 35-40 per day.
You have a link for those batteries?

I likely would have painted before assembly as I know I wouldn’t after in operation.

https://batteryhookup.com/products/no-busbars-4-new-eve-3-2v-280ah-lf280k-v3-lifepo4-prismatic?variant=44207384592546

Looks like they're out of stock right now, but they restock regularly. They are local to me, and offer cash discounts if you pick up in person at their warehouse. I got 16 cells, jk bms, and tape for $1500.

 

[sodamo]

Thanks
But I question you actually have 90kwh
48v = 16 cells in series (51.2v 280ah 14.336kWh)
You would need 6x
Still cheaper than what I got. but I am so pleased with LiFePO compared to lead acid.

 

[fatjay]

Thanks
But I question you actually have 90kwh
48v = 16 cells in series (51.2v 280ah 14.336kWh)
You would need 6x
Still cheaper than what I got. but I am so pleased with LiFePO compared to lead acid.

Yes, 6x, that's why there's 6 shelves going into that room. Also they are listed as 280ah, but they test at 304ah which is 15.5kwh, but i just say 15kwh per pack.

I just got an email that 3 sets arrived in port today, so they'll be here in a week!

 

[fatjay]

90kwh, I’m envious with only 57kwh. We use 35-40 per day.
You have a link for those batteries?

I likely would have painted before assembly as I know I wouldn’t after in operation.

The rule of thumb is 3x capacity minimum of your daily use, but ideally 5x. Cloudy days or weeks can wipe out your packs if you don't have enough to spare.

 

[sodamo]

The rule of thumb is 3x capacity minimum of your daily use, but ideally 5x. Cloudy days or weeks can wipe out your packs if you don't have enough to spare.

That would be totally out of my budget. My challenge isn’t battery, but the handful+ days of limited PV charging. Last year about $50 for generator, a bit more this year. Much more than what I have would be overkill. Most days I meet charge parameters mid morning. Gen comes on if I’m approaching 30% SOC. I avoid deep discharge. Can buy a lot of fuel for price of battery.

Normal for us is about 25-35% of battery if full daily charge

I need to read more about your inverters.

 

[fatjay]

That would be totally out of my budget. My challenge isn’t battery, but the handful+ days of limited PV charging. Last year about $50 for generator, a bit more this year. Much more than what I have would be overkill. Most days I meet charge parameters mid morning. Gen comes on if I’m approaching 30% SOC. I avoid deep discharge. Can buy a lot of fuel for price of battery.

Normal for us is about 25-35% of battery if full daily charge

I need to read more about your inverters.

In person cash price for the 15kwh packs is $1200. Which is super cheap compared to buying premade packs.

If they’re lifepo4 cells taking them from 100 to 0 is totally ok.

I’m starting with 45x240w panels but I’m going to put another 90 on the garage roof. That should put me completely off grid.

 

[fatjay]

That would be totally out of my budget. My challenge isn’t battery, but the handful+ days of limited PV charging. Last year about $50 for generator, a bit more this year. Much more than what I have would be overkill. Most days I meet charge parameters mid morning. Gen comes on if I’m approaching 30% SOC. I avoid deep discharge. Can buy a lot of fuel for price of battery.

Normal for us is about 25-35% of battery if full daily charge

I need to read more about your inverters.

Here's some good info for Lifepo4 batteries.

 

[sodamo]

In person cash price for the 15kwh packs is $1200. Which is super cheap compared to buying premade packs.

If they’re lifepo4 cells taking them from 100 to 0 is totally ok.

I’m starting with 45x240w panels but I’m going to put another 90 on the garage roof. That should put me completely off grid.

Impressive system you are building. I have 64 panels, 18.46kw. 3 different sizes in 4 arrays pointing different directions. They feed 4 MPPT charge controllers. This system was installed 2019 so older tech. I only know of 1 person locally with a larger system, 90kwh battery (tesla power wall I think) his large system is to charge his Tesla. But another friend told me that during a particularly rainy period last year he totally lost power, no generator. I should ask about this season.

My manufacturer says life cycle 10,000 cycles at 80% DoD but only 3500 at 100% DoD. My hope is they last my lifetime +.

We have lived totally off grid since 2005. Started with a homemade 12v system built from a HomePower schematic.