24v milk crate

[LearningIt]

Milk Crate Solar Power System

Tired of wasting your money on cheap solar generators that overheat or have a limited input/output capability? Buy some high quality components and shove them into a milk crate! Extremely durable and...

www.mobile-solarpower.com

Could someone follow this milk crate example for a 24v battery system, with a 24v inverter and the drok AC charger power supply set to 28.8v?

When would you use the basic fixed voltage AC charger power supply like here and when would you use a dedicated lifepo4 charger? The latter if not connected to a SCC?

 

[John Frum]

I think @LearningIt wants someone to adapt this system to 24 volts.

 

[chrisski]

I built one really similar to the one you linked, except at 24 volts:

Crate Build: 1200 wh, 24 Volt, 300 Watt Inverter.

I have finished my crate build: Originally a Crate Build: 600 wh, 24 Volt, 300 Watt Inverter, and put a second battery pack to make 1200 wh Goal was to continuously supply 250 watts of power which could get recharged simultaneously by 600 watts of panels. I will call that a success with a test...

diysolarforum.com

I did not install a power supply, so I just charge mine off the SCC. If wanted to recharge from 120 VAC, I would install the DROK powere supply.

 

[LearningIt]

Thank you for the link. I'm thinking of making the crate with a 24v DC-240v AC split phase inverter, so I can use the 120v or connect it to my (US NA 240v split phase) service panel, through a properly isolated generator inlet and panel interlock (or transfer switch) of course.

There is a big jump in price and lower availability between a 24-240 inverter with and without split phase support. The basic ones supporting split phase I have found include:

4000W DC 24V Split Phase Pure Sine Wave Inverter With Charger

Sungoldpower 4000W DC 24V Split Phase Pure Sine Wave Inverter With Charger. Hightlight: This Pure Sine Wave Inverter for power is a combination of an inverter dc to ac, battery charger and AC auto-transfer switch.Low frequency,low Idle Current,remote control. The split-phase 4000 watt power...

sungoldpower.com

3000 Watt 24 Volt to 120 / 240Vac Split Phase Pure Sine Inverter Charger

3000W Pure Sine Power Converter, converts 24V to 120V 240VAC. Built with smart battery charger of 50 amps. LF transformer inverter, 50Hz 60Hz output.

www.sigineer.com

Many of the devices that claim to support 240V split phase (Like the MPP and the Growatts) really require two of them connected in parallel, AFAIK.

I don't understand why I can find an inverter gas generator more powerful than these basic inverters for the same or lower price.

 

[LearningIt]

Need advice: looking for split phase battery backup system, generator-style

Context: Where I live, the power sometimes goes out and [natural gas] heating goes down with it because fans stop working. I have a 240V split-phase generator inlet with manual transfer switch, which works fine but it's loud and we have to turn it off at night. I am now looking to also have an...

diysolarforum.com

Subpanel powered by inverter neutral wire?

Hello, Wiring a subpanel in my RV, 110 volt single phase, subpanel powered by the "output" of a 2000watt inverter(with transfer switch built in). Moved 3 breakers from main panel to a subpanel, which powers the 110 volt AC plugs in the RV. Standard wiring: 3 Neutral white wires to...

diysolarforum.com

It looks like I am not the only one looking for a way to feed battery power to US 240/120 split phase.
There are inverters that do this obviously, but there is a big jump in price (and probably quality) to support split phase.

What if...you use a 120V pure sine wave inverter connected to one leg of the panel and to neutral, with a generator inlet, the interlock to disconnect the main breakers, the 240V circuit breakers turned off, and an inverter that does not drive -60V on the neutral (https://diysolarforum.com/threads/6...120vac-psw-inverter-is-this-a-hazard.28561/)?

Could you safely operate those circuits that were on that 120v leg?

How can you tell which 120v inverters are NOT +60/-60?

The easiest thing is just to get a Growatt or MPP e.g. but I am curious about this. It would just be for emergency use, possibly even without panels and an SCC, just batteries, charger and inverter.