Hi All

it can work without battery and power? 

with solar panels only

Thanks for answer.

 

Nope.  Need batteries to run. 

As above; it needs batteries. 

The VM III can definitely run WITHOUT batteries, it is in the description and you can watch YouTube videos from Pakistan showing the inverter running without batteries 

Hi

Thank you for your answers.

I try without a battery and, I write the result.

You can start you inverter on PV panels but at least 6 to get a good VOC voltage range.

You can work without batteries but when shadow clouds cover your panels power goes down an inverter well stop feeding your load untill shadow disappears.

 

Hello

Today I start the inverter without panels & without battery,  bypass mode working.

in a few days, I will install 12 panels. Typ EXE Solar EXP285 285W Voc: 38,90V  x12 = 466.8 V

I write the result.

11 hours ago, tonio said:

Hello

Today I started the inverter without panels & without battery,  bypass mode working.

in a few days, I will install 12 panels. Typ EXE Solar EXP285 285W Voc: 38,90V  x12 = 466.8 V

I write the result.

 

8 hours ago, tonio said:

Voc: 38,90V  x12 = 466.8 V

That's presumably at 25°C. At 0°C, it will be about 7% higher, which is right on the 500 V absolute maximum for the solar charge controller. You're cutting it very fine.

Hello

today I started the PV modules, 8pcs, for test, there is little PV voltage, 258V, at a load of 2500w, Voc = 292V, I add 2 more PV  for testing,

I write the result.

Hello.

unfortunately the weather is bad,I couldn't put the panels on, I write when I did.

My question is this.

I put up 4 batteries, type: YUASA SWL2500T

https://www.intercel.nl/media/datasheet/yuasa-swl-2500tfr.pdf

this is how I set the charge:

 

this is good? what is the maximum for the ampere?

Thank you in advance for your help.

 

 

8 hours ago, tonio said:

I put up 4 batteries, type: YUASA SWL2500T

https://www.intercel.nl/media/datasheet/yuasa-swl-2500tfr.pdf

Those are 90 Ah modules. They are very small for a 48 V inverter.

8 hours ago, tonio said:

this is good?

The settings seem OK, except for the back to grid and cutoff voltages. To get reasonably life when long load shedding is likely, you need to set these much higher. Perhaps 48 V cutoff, 50 V back to grid. Maybe one volt lower for both of those. Keep 2 volts between the back-to-grid and cutoff voltages, as per FAQ 2. This will not give you much run-time, but you can't safely get much more out of those tiny battery modules.

Quote

what is the maximum for the ampere?

Maximum charge current is 22.5 A, so 20 A in the setting is correct.

As for what the maximum discharge current is, it's specified quite strangely (to my eye). It seems to be saying that at a 2500 W (per module) discharge, it will last only 10 minutes. But that's 208 A. A 5 kW inverter at full power will be more like 117 A. So it might last around 20 minutes. So I would keep the loads under about 2000 W if at all possible, with the average load much less (under ≈300 W). Or get more or bigger battery modules.

Hi  Coulomb

Thanks for the reply.

now the budget does not allow more battery,the piece of these was very cheap,consumption is also low now, here is the graph

operated on battery for four and a half hours.

 

Today was sunshine all-day, I got this result, 8-PV series in 2-string 1PV=285W/ 290W

I use this to measure consumption.

They tried this battery, opinion?

https://www.ltc-energy.com/Lithtech-TE2000-2-4kWh-Solar-Battery-Storage-48V-50Ah-Battery-Energy-Storage-pd47726055.html

AXPERT VM III 5000-48V + MPPT 5000W

Document says max 5000W PV input. How long this can be increased, 10% - 20% ?

On 2020/10/23 at 4:49 PM, tonio said:

Document says max 5000W PV input. How long this can be increased, 10% - 20% ?

The recent 5 kVA models all have a nominal 4000 W (80 A @ 50 V) solar charge controller. So that's a 25% overclock already. So I don't believe that you can overclock any further than that.

Thanks for the reply.

Then it stays that way, 8S2P, so 285*8= 2280W    290*8= 2320W  2280+2320 =  4600W

So there should be no problem if it stays that way.

What I'm doing wrong?
This is my setting:

why not charge continuously at 54.6 volts, why not keep it at this value?
Back to discharge voltage: I set it to 58-V. Charging does not stop at 54.6 volts.
Charges to 58 volts, then switch back to battery mode.

 

I managed to set it up as I should.

Now the charge is good. It works fine for me.

It is the setting:

This is what the beginning looks like, there is still space on the roof, the expansion will be in the spring.

Did someone try to use this way battery balancer?

18 hours ago, tonio said:

Did someone try to use this way battery balancer?

 

Hey

I done did it like this, but with Gel batteries. I use Victron Battery balancers

 

18 hours ago, tonio said:

Did someone try to use this way battery balancer?

See no problem, just need to check your charging amps to charged the batteries x 2.

Hello

Thanks for the reply.

Hello

I found the answer to what I was looking for,

Victron document says: Connect two or more battery balancers in parallel (on average one balancer will take care of up to three parallel 200 Ah strings).