Need Some help with this Inverter SCHNEIDER 6.8 KW 48 VDC GRID TIE BATTERY INVERTER

[ButchDeal]

Thank you Mike,

Can this inverter gather power from PV, battery bank and the grid to power the load together instead switch between them? The Magnum 4448PAE I have now only switch to grid when the PV and batteries are low. I don't want that. So when the battery can't manage the load, Can I program the inverter to get assist from the grid? ant way my load is not that high at any given time. it usual draw 25 to 40 amps at 55 volts DC. it mean about 1500 to 2500 watts normally except when I turn on the water pump. the water pump is 1500 watts and combine normal power it would be 4000 watts; So the Trojan L16RE would be enough to buffer the ripple current?

Thanks.

Do you have net metering available to you? If so then you can have the batteries only for backup and cycle them rarely.

Otherwise many of the bymodal inverters have zero feed in options in the programming, Some do this better than others though.

[paulcheung]

Thank you Mike,

Can this inverter gather power from PV, battery bank and the grid to power the load together instead switch between them? The Magnum 4448PAE I have now only switch to grid when the PV and batteries are low. I don't want that. So when the battery can't manage the load, Can I program the inverter to get assist from the grid? ant way my load is not that high at any given time. it usual draw 25 to 40 amps at 55 volts DC. it mean about 1500 to 2500 watts normally except when I turn on the water pump. the water pump is 1500 watts and combine normal power it would be 4000 watts; So the Trojan L16RE would be enough to buffer the ripple current?

Thanks.

[Mike90250]

First, I'm Off-Grid, and don't sell back.
But I have the same inverter requirements, enough battery to be a buffer for the ripple current. PV panels have no capability for reserve, and even if you had 20K of panels, they are "isolated" by the solar charge controller. The batteries act as a giant capacitor, and their fat short leads are quite low in inductance at 60 hz (ripple frequency)

Your inverter can only supply 6.8kw (a bit more, look at the surge ratings and time allowed) If your battery and solar can't keep up with that demand, the inverter stops selling and goes into Assist Mode? I'm guessing here.
When running my 3kw generator, if loads exceed the generator rating I programed into the SCP, the Inverter backs off battery charging, and if I pull even more load that 3kw, the inverter "assists" the generator (Generator Assist Mode) and resumes charging batteries when the load diminishes .

[paulcheung]

Hi Mike,
Thank you for your reply. I am new to the grid tie system. I don't quite understand you. isn't it the power export to the grid is the PV power not from the battery bank? what I want to do is try to export some power to the grid when the PV current getting too high and not to kill the battery bank.

I know you have the XW6048 inverter. Can you tell me something about this inverter? when the battery bank and the PV power can't supply the load. what does this inverter do? does it switch to the grid totally with a transfer switch or it took some current from the grid and the PV plus the battery still supply some of the load?
Thank you.

[Mike90250]

The general guideline for battery size for 48V inverters, is 100ah battery capacity for each 1Kw of output power. The battery supplies the "ripple" current needed to create the AC sinewave. Too small of battery and the waveform gets distorted and inverter may shut down. If you expect to export 5Kw to the grid, you need 500ah of battery to ameliorate the ripple effects on the DC bus.

This is required on top of the amp hours needed for power consumption.

[paulcheung]

Hi guys,

SCHNEIDER 6.8 KW 48 VDC 120/240VAC 60HZ GRID TIE BATTERY INVERTER. XW6848.

My solar system vendor told me this inverter can be grid tie and work with batteries. He said I can use the current battery bank and grid tie this inverter, when my battery bank reach to a set voltage it will either take some power from the grid when the battery bank volt reach low and sell back power to the grid when the battery bank voltage reach to the high setting.

My battery banks is dying, I don't want to do a full replace which would be two banks of 400AH 48 volts. if I get one bank only with 370AH 20 hours like Trojan's L16RE. would the battery bank be damage before the voltage reach to the selling point to the grid if the PV charging current be as large as 80 amps pump into the battery bank? is there a way to program this inverter so the large charge current won't damage the battery bank?

Any one has experience with this inverter can give some insight information?

Thank you in advance.