Hi folks. This is my first post so greetings for every user 🙂 Recently i bought 24V 3500W off-grid inverter (link below):

https://www.alibaba.com/product-detail/SNADI-5-5KW-48V-100A-MPPT_1600056398800.html?spm=a2756.order-detail-ta-ta-b.0.0.20362fc2vhctHV

It cost me exactly 375.36 USD including WiFi module, Alibaba fee and DDP shipping by train to Poland (I needed to wait exactly 3 months 😕 Anyway I think it is a good price for this device. After I received it I tested AC output load 2-3kW (water heater etc. and other inductive and ressitance loads) everything is fine. AC charger module also works well (it can truly provide 80A currento to the battery). My battery setup is 8pcs of Lishen 202Ah LiFePO4 prismatic cells + 150A Daly BMS with BT.

Before I've decided to buy this device supplier gave me instruction manual in pdf as You can see below. But in the inverter's settings, there are missing time points and time intervals inwhich AC charging or even AC outputs will operate (numbers 50-53 and 54-58). Last number available in menu is #36. I've already contacted the supplier but currently there is a New Year holiday in China... Is it possible to flash newer firmware and get these options available? Below I attach photos of how it looks like inside (I have many photos showing detalis of components but cannot upload here - 3MB limit). I will try to upload in other place and link here PHOTOS

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Edited February 3, 20223 yr by Bocian

1 hour ago, Bocian said:

there are missing time points and time intervals in which AC charging or even AC outputs will operate (numbers 50-53 and 54-58). Last number available in menu is #36. I've already contacted the supplier but currently there is a New Year holiday in China... Is it possible to flash newer firmware and get these options available?

If it really is a clone, then this is unlikely, but possible. You really don't know what you get with a clone.

But yours looks close to genuine to me. All I noticed was:

* The sticker says blue and white, but I'll swear black and blue that it's not blue!

* The DSP chip (TMS320F28062) has no sticker on it. Genuine Voltronic models always seem to have them.

* Were you able to open the case without cutting a "warranty void if removed" sticker? I've never seen that in a genuine.

* The IGBTs are unfamiliar to me, but I don't know the 24 V models well, and it happens that the IGBTs I know of are now obsolete. So these might be the replacements.

* The "Success" brand capacitors look cheap and nasty, but I haven't looked up their specifications.

* Those battery terminals look like ones I've used before, and from memory they are rated at 80 A. The sticker says 162 A, and you'd need about that to get rated output.

43 minutes ago, Coulomb said:

 

Hi Columb. Thanks for a quick reply 🙂

Yes, You're right sticker says blue&white but in fact the front cover it is orange&black.

There was a sticker with QR code on (MCU i think), I just removed it to take o photo of description

On the right side, above screw place was production date (year and month - 10-2021), on the left side only small, round "QC passed" nothing obout warranty voiding

Yes, I know these capacitors look cheap and I think about exchanging them with brand ones with low impedance and long life declared

Battery terminals I can always remove and add copper bars/wires + outside 2x connectors for 50mm2 cable. There is 150A marked, metal fuse just after terminals. 

 

 

Edited February 3, 20223 yr by Bocian

Anybody knows where I can find VM II 3,2-3,5kW 24V firmware which include 50-58 menu options (time setting and AC charger time intervals)?