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Any ACTUAL experience with EASun?

Miles B said:
Why?
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They don't give it a maximum power rating without good reason.

The manufacturer designed and built the charge controller and rated it accordingly. Components are selected to manage a given load for a given amount of time/frequency/cycles before failure. Increase the time spent at maximum rated capacity and failure will arrive sooner. Components are going to run hotter, for longer and as a result they will die sooner.

Sure, it will work, but its lifespan will be reduced and not using an item in accordance with the manufacturer's design specifications would breach warranty conditions.

I advise not exceeding the manufacturer's specifications. Whether you choose to ignore them is up to you.
 
It's clear that it is important not to exceed the specifications because the components of the Voltronic / SRNE inverters and surely others are dimensioned as accurately as possible.

When it says "Max Open Voltage 500V" on the label, I can tell you that the capacitors on the board are 500V!

1673972643961.png

In addition, do not forget that the Voc voltage (STC) of the panels is given for a cell temperature of 25°C and it is necessary to calculate the Voc voltage at -10°C (unless you are certain that this will not happen never at home) depending on the temperature coefficient.

Here is the calculation for my panels:

1673973784087.png

String of 10 panels :
  • Voc @ 25°C = 379,2 V
  • Voc @ -10°C = 412,4 V

That makes a difference of 33 V and could exceed SCC MPPT specs if miscalculated.
 
I'm aware of that calculation, but I'm also aware it's of no use. Panels will never see stc irradiance at the lowest ambient temp for my location. Because that temp was at 4am in winter. The whole process of calculating that voltage is stupid. The only time voc is encountered is on mppt startup. So somehow we would have to go from massive shadowing to full sun, at around midday summer irradiance, and middle of the night winter cold. The only time my location has ever received enough irradiance to show high voc numbers, the minimum temperatures ever recorded in those months is 20C higher than the annual minimum, and that temperature was at night too. And we'd somehow be needing full shade with panels at ambient to full sun, instantly.
 
Miles B said:
I'm aware of that calculation, but I'm also aware it's of no use. Panels will never see stc irradiance at the lowest ambient temp for my location. Because that temp was at 4am in winter. The whole process of calculating that voltage is stupid. The only time voc is encountered is on mppt startup. So somehow we would have to go from massive shadowing to full sun, at around midday summer irradiance, and middle of the night winter cold. The only time my location has ever received enough irradiance to show high voc numbers, the minimum temperatures ever recorded in those months is 20C higher than the annual minimum, and that temperature was at night too. And we'd somehow be needing full shade with panels at ambient to full sun, instantly.
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Sorry but you are not correct. You can frequently have Voc Midday simply due to the SCC cycling down with state of battery charge and loads. I have seen the lensing effect drive the Voc much higher during that time.

Now while I agree it is rarely an issue, it is a possibility, and therefore considering the potential loss, it is cheap insurance to keep 10% below your SCC max Voc rating.

It is never stupid to do the math.
 
Mattb4 said:
Sorry but you are not correct. You can frequently have Voc Midday simply due to the SCC cycling down with state of battery charge and loads. I have seen the lensing effect drive the Voc much higher during that time.

Now while I agree it is rarely an issue, it is a possibility, and therefore considering the potential loss, it is cheap insurance to keep 10% below your SCC max Voc rating.

It is never stupid to do the math.
Click to expand...

I wasn't addressing lensing/reflections etc, I was addressing the temperature coefficient calculation. That is garbage. If you want to give examples where a margin is valid, that's fine. But the re-rating due to assuming max irradiance at annual min temp is not realistic.
 
My EASUN 3.6 kW off grid hybrid inverter completely discharges the batteries (120 Ah, 24V) in winter. Can it be? Does it also consume power when turned off? It is not possible to connect my inverter input to the grid. Do all offgrid inverters drain the batteries to 0V when the public grid shuts down and there is no sun?
 
uldisst said:
My EASUN 3.6 kW off grid hybrid inverter completely discharges the batteries (120 Ah, 24V) in winter. Can it be? Does it also consume power when turned off? It is not possible to connect my inverter input to the grid. Do all offgrid inverters drain the batteries to 0V when the public grid shuts down and there is no sun?
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Are you using LiFePO4 batteries? The BMS in them trips on low voltage which can give a 0v reading.

The AIO will continue to draw power from the batteries (if no BMS) as long as they are connected. Not as much as when switched on but still a small amount to check for PV for charging and power the electronics.
 
uldisst said:
My EASUN 3.6 kW off grid hybrid inverter completely discharges the batteries (120 Ah, 24V) in winter. Can it be? Does it also consume power when turned off? It is not possible to connect my inverter input to the grid. Do all offgrid inverters drain the batteries to 0V when the public grid shuts down and there is no sun?
Click to expand...

All inverters consume, some more than others. The problem with some AIOs is that it is not always possible to turn off the inverter part to work only with the SCC MPPT to recharge the batteries without draining them at the same time. Mine doesn't consume power when turned off.

For your batteries if they are really at 0V then they are dead.

What is your EAsun model?
What battery model?

You have 2800Wh of batteries, if it is lead acid it is good not to consume more than 50% so 1400Wh. Some inverters like mine EAsun SMX 5.6kVA consumes 50Wh so 1200Wh/day which would already be almost all your battery when you don't have much sun.
 
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In winter, when my batteries are too low and there is not much sun, I configure my AIO in ECO mode (28Wh) and I only turn it on from 10 a.m. to 4 p.m. to recharge them.
 
When I connect the battery to the inverter I do it via a pre-charge resistor as in the video below. I also have a breaker to isolate my battery but I use it very rarely. It is necessary to redo the pre-charge procedure each time the battery is disconnected from the inverter for a long time (capacitor discharge time).

If my AIO is off, the consumption is less than 1W which is OK for me.

 
Sleeper85 said:
Any ACTUAL experience with EASun?
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A bit on the side of the original question but beware that EASun have no technical expertise and have no particular desire for the customer to be satisfied, guess how I know...

My SMW8k inverter died because EASun sent me the wrong firmware to fix an imaginary problem and since then, 7 months have passed and quite a few emails have been exchanged, and the only offer they have come up with is for me to pay them to fix the problem...
 
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SveinHa said:
A bit on the side of the original question but beware that EASun have no technical expertise and have no particular desire for the customer to be satisfied, guess how I know...

My SMW8k inverter died because EASun sent me the wrong firmware to fix an imaginary problem and since then, 7 months have passed and the only offer they have come up with is for me to pay them to fix the problem...
Click to expand...

EAsun only sell, don't expect any support from them. Might as well know before you buy.

On the other hand, if your AIO was working well, why did you upgrade the firmware?
 
Sleeper85 said:
Might as well know before you buy.
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Before the purchase, I did quite a bit of research on EASun and I found no alarming negative indicators... It is whan you get in trouble you really get to know which kind of company you are dealing with, othervice all customers are satisfied...

Sleeper85 said:
why did you upgrade the firmware?
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My local power company detected that the inverter leaked power TO the grid even if it is not equipped to do that. That was the reason for the upgrade which was why EASun sent me new firmware. In retrospect, the tiny amount of power (2kWh in 10 months) represents no real problem at all and my local power company agrees...
 
Thanks for the tips, this is my first major solar project in a country house and it seems like a failure. I rarely use the 220v output of the inverter, 24V - LED lighting and radio on weekends. Could opening the inverter housing with a soldering iron and pliers disconnect the inverter, it's mppt charge controller ON, inverter OFF. My Inverter = ISolar -SMX-II-3,6kW, lead-acid batteries.
uldisst said:
My EASUN 3.6 kW off grid hybrid inverter completely discharges the batteries (120 Ah, 24V) in winter. Can it be? Does it also consume power when turned off? It is not possible to connect my inverter input to the grid. Do all offgrid inverters drain the batteries to 0V when the public grid shuts down and there is no sun?
Click to expand...
Thanks for the tips, this is my first major solar project in a country house and it seems like a failure. I rarely use the 220v output of the inverter, 24V - LED lighting and radio on weekends. Could opening the inverter housing with a soldering iron and pliers disconnect the inverter, it's mppt charge controller ON, inverter OFF. My Inverter = ISolar -SMX-II-3,6kW, lead-acid batteries.
 
I also have an EAsun SMX II but the 5.6kVA model. It is an AIO produced by SRNE.

I don't quite understand your questions but what I can tell you is that unfortunately with this AIO it is not possible to use the SCC MPPT when the inverter is OFF. When the inverter is OFF and PV ON the display will light up but the batteries will not charge.

You have very few batteries. This is going to be a very big problem with your hybrid inverter.

You can also activate the ECO mode, for me it is parameter 22. So your inverter will consume less when it is not used but for me it still represents 28Wh ! You turn on your inverter just to charge your batteries and you turn it off at the end of the day.

Alternatively, if you don't use the inverter often you can purchase a separate MPPT SCC that can charge your batteries without turning on the inverter. In this case, your AIO only serves as an inverter.

Here are the consumptions measured at home for the SMX II 5.6kVA model :
1675876535594.png

ECO mode operation
  • Load <= 25W the inverter switches to ECO mode after 5 minutes (0V)
  • Every 30sec it sends a signal to detect a load > 25W
  • If a load > 25W is connected it restarts when the signal is sent (every 30s)
  • Test with a 25W load => it switches to ECO mode
  • Test with a load of 40W => it restarts
 
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wattmatters said:
The last two rows show the exact same state but different consumption.
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Good point, I updated the table. The first test is done during the day, in this case the AIO turns on because it detects a signal on the PV input. The second test is done at night and in this case the AIO does not turn on. In both cases the AIO switch is OFF. Unfortunately no charge from PV in this case.
 
Beware of EASUN. The new hybrid inverters have wifi communication with the SmartESS app without security, and some critical inverter operating parameters are being exposed. The manufacturer has refused to provide me with the communication protocol so that I can monitor my system from my computer. It is a very suspicious and probably criminal attitude; remember that these are high-powered devices connected to the national electricity grid. BE CAREFUL, please.
 
I fail to see how they pose any danger to a national grid.

Why connect them with wifi at all? Mine tells me all I need to know locally via Solar Assistant.
 
Hi, guys,
I have an Easun SMX II 5,6 KW and I would like some advice on how to start lead acid battery equalization on this device. I don't even know how to know that the equalization is running. Is there a special setting or a certain mode of operation required?
Thank you for any good advice
 
Miles B said:
I have read a handful of comments where people ask if EASun and MPP are the same product internally. There have been a few replies stating that "the internal components are lower quality". I am very skeptical. Does anybody have any actual knowledge that EASun is not the same product? I am aware that MPP is possibly a Taiwanese company, and EASun is Chinese. My understanding is that Voltronic do ALL of the manufacturing.

The reason I ask is that there is one MPP importer in Australia, but the comments around their after sales support seem like buying from them is not worth the 30% premium in price vs buying EASun, or possibly importing MPP myself, if I can find a reliable overseas seller.

Does anyone have any concrete evidence of these "lower quality components" or any other experience with EASun?

Alternatively, is there a decent MPP seller in Asia that will ship?
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Avoid this company. Zero support and will not refund your purchase unless you ship right to China which is not feasible. Even asked me to sell on commission to recoup my money. Communication is terrible. By far worse company I’ve ever dealt with. Pay extra for legit company.
 
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