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None of those things matter when your solar array is 4.5 kW and you have a standard 150A/200A grid in....

Like I said, they basically are not sold to scale like a normal household uses electricity.

EDIT: What the heck is in-rush and backfeed? Are you talking about AC input to charge the batteries? The 18k is 50A @ 240VAC (12kW) fyi. Also, why does the charge rate even matter there? For the AC output its also 12 kW...the family is average 48 kWh days, which is 2 kW hourly average...

Inrush is exactly what it says it is, it's inrush current. When you have a sudden surge on something, that's inrush. Lots of appliances in your home have a large inrush, much larger than the breaker they're on. Inrush happens faster than a breaker trips, which doesn't matter when you're on the grid and the inrush is lower than your mainbreaker, it matters when you have an inverter in the way with a passthrough limit and an inrush limit. Typical central HVAC units have LRA over 100 amps.

If we're talking about 'doesn't even matter with a 4kw array' well, hell, how the hell you gonna charge ~40kwh of battery with solar array that nominally produces 20kwh a day on its best day, assuming all conditions are perfect?

Backfeed is what the inverter can push out from the battery to the home. It's the size of the tube coming from the gallons of water reservoir. EG4 18k has a tiny tube, no matter how much battery you put on it. Like emptying a 50 gallon drum with a drinking straw(and with the 4kw array, filling it with a 12 oz cup).

https://www.wartsila.com/encyclopedia/term/backfeeding huh?

> Inrush is exactly what it says it is, it's inrush current

These are not terms commonly used in the industry, thanks for the clarification.

> Lots of appliances in your home have a large inrush, much larger than the breaker they're on.

And inverters are designed to compensate for short term surges too fyi. The 18k provides 65A for a few seconds as an example.

> well, hell, how the hell you gonna charge ~40kwh of battery with solar array that nominally produces 20kwh a day on its best day, assuming all conditions are perfect?

Because you can't and don't need to...you should be asking the author of the original post, because they do what pretty much every other grid tied system which is that you pass through the power from the grid.

> Backfeed is what the inverter can push out from the battery to the home.

> It's the size of the tube coming from the gallons of water reservoir. EG4 18k has a tiny tube, no matter how much battery you put on it.

1. The 18k can push 50A on each leg and most residential are sized at 150a or 200A, which are ridiculously oversized, so at most, even with two EVs and a 4 ton AC running in Texas, I max out at 150A. I can put 3 18k's in parallel if I really want to and its STILL cheaper than a powerwall battery/inverter combo.

2. There is no reason to have a "pipe" so large that it only is used for less than 5% of the overall runtime. This is why the powerwall setup doesnt make any sense.

>These are not terms commonly used in the industry, thanks for the clarification.

It's such an industry term that it's literally a named feature on multimeters.

>The 18k provides 65A for a few seconds as an example.

Yes, you'll see I gave you that spec in the opening comment. It's not a good spec for a whole home hybrid inverter.

>the 18k can push 50A on each leg and most residential are sized at 150a or 200A

That's not how you read a spec sheet for 240v device. A home service is 200 amp, at 240v. That's 48kw potential. 12k is 12k regardless of whether that's (120v * 50a) + (120v * 50a) or (240v * 50a). The legs aren't cumulative. You're implying the standing load capacity is somehow higher than its inrush capacity. It would need to be a 24kw (on the ac side, all of the janky chinese rebrand inverters all list their DC input to try to make themselves seem bigger) inverter to do what you're implying.

(50a * 120v) + (50a * 120v) = 12kw

A small home with a smaller 150 amp service is (150a * 240v), 36kw.

Edit: screw it, I'll address this as well -

>There is no reason to have a "pipe" so large that it only is used for less than 5% of the overall runtime. This is why the powerwall setup doesnt make any sense.

There sure is! The whole point is to offset usage. 50 amp standing load capacity means you can only ever offset 50 amps of usage at one time. Sure, most homes don't hold anything higher than that for long but I've seen plenty of homes hold over 20kw for a bit if they have pool pumps, well pumps, pool heaters, or any number of things going on. Any time the home draws more than 12kw instantaneously you'd be getting charged peak rates, which could be avoided with a larger standing load capacity. In addition, if you're in a municipality with a 'demand' rate you could enter in to a different billing rate any time you go over a certain amperage, meaning that ability to offset more of that in that instance, even just for an inrush, could make an even larger difference on your bill.

Look man, I run an $800 chinese inverter, and my batteries are MuRatas I harvested from decommissioned Sonnen cabinets that I rewired with chinese BMSes. The Powerwall 3 is a really good product and the pricing is great compared to comparable non-diy consumer grade products. The EG4 is not a good comparison point because it has nowhere near the spec or capability. You would need 3 EG4 18ks to have the inrush capability of a single Powerwall 3. Battery capacity (volume) is not the sole determining factor in value. This isn't even relevant but just as an aside, the EG4 isn't even a good value for the DIY scene, and has functionally the same support as rebranded drop shipped Chinese inverters.

> This isn't even relevant but just as an aside, the EG4 isn't even a good value for the DIY scene

I would respond to all of your items individually again but its clear by this comment I can't you seriously and now you're just trolling.

I'd love to know why you'd choose an EG4 18k (which is actually a 12k AC inverter, with a questionable track record on support and warranty) over a Sol-Ark 15k (which is actually a 15K AC inverter, and has tech support that responds) now that Sol-Ark dropped the price on 15ks to sub $5,000 MSRP.

I'd rather land wires in a Sol-Ark, it has better support, it has a higher AC output, it has a higher battery charge rate, and it's the same price.

https://energylibrary.tesla.com/docs/Public/EnergyStorage/Po...

Ok lol...so it turns out you're not even correct on a powerwall's spec...each inverter maxes out at 48A/240VAC...LMAO

Be gone troll.

Yes, 48 amps at 240 is 11.5kw. Each Powerwall 3 is 11.5kw(edit: not to be confused with its capacity which is 13.5 kwh, one is a power output, one is a storage capacity. Just so you don't go thinking that's some amazing mixup between the comments). The original comment is all within your framework of 3 Powerwalls vs one EG4 18K with 3 batteries. That's 12kw AC for the EG4, and 34.5kw on 3 Powerwalls. I've never stated a single powerwall has more output than that(hell I even rounded down on the output of the 3 powerwalls to 34kw), only that they have a very impressive inrush and solar capacity. The incongruity of the comparison between the two systems is the entire origin of this discussion. Do you even remember what you posted and I responded to? You don't know how to use an amp clamp and don't understand the American split phase power grid. Stop consulting ChatGPT for 'gotchas' and actually read what you're writing.

Just to be perfectly clear on your continued misunderstanding - each powerwall is also an inverter, it has its own AC power output. That stacks. The batteries strapped to the EG4 are all limited to going through the EG4. That means no increased output for adding more batteries. No stack.

With 3 EG4s in the comparison you would have a similar standing load capability(36kw claimed), however you'd still only have roughly 1/3rd the inrush capability(190 amps).

Honestly, I thought I started this conversation nicely enough and went out of my way to be informative and you've only tried to insult me and be snide while having the loosest grasp on the subject matter.

labcomputer 149 days ago

Inrush is surge capacity. Starting a big motor like an air conditioner can require 2x or 3x the continuous running amps, but only for a few seconds.