Nadeem Ahmed

Thanks for sharing your experienced views.

I have recently installed an Hybrid solar inverter. It is 6KW Inverter (IP65) with dual MPPT controllers. It supports 9KW panels on both MPPTs (combined, meaning 4.5KW on each MPPT). I have the following configurations of PV panels installed: - MPPT1: 325W x 9 + 320W x 4 = 4205Watts (All connected in series) MPPT2: 585W x 8 = 4680W One of my friend mentioned that we should use the exact same configuration with both MPPTs. Can someone please guide me on this? Thanks in advance. Nadeem Onyx PV9000.pdf

From your original post, I got that you also have Infinisolar V for which you have got the new firmware.

Jaco, Wasn't you talking about updating firmware of your Infinisolar V inverter? Or do you have another one? I apologize if I got it wrong. What I am looking for is ... updated firmware for my Infinisolar V 5KW and instructions on how to update it.

That's exactly what came to my mind as a first step to suggest. Hopefully it will resolve the problem. @Coulomb, I am not aware of any undocumented commands. What do these 30 sets of 4 digit numbers mean? What information does it represent actually? Where can I get further information on it? Thanks.

Basically, I am considering to upgrade my inverter from Infini V 5KW to Infini E 5.5KW. The primary reason is not that extra 0.5 KW that I will be getting but primarily the MPPT Operating range (120V to 450V) is much better than Infini V (60V to 115V) The other benefit I assume if the better mixing of Grid and PV where I feel Infini V is not very good at. That I assume should give me more cost savings without having to switch between SBU and SUB. Looking for expert's advice and opinion ... @Chris Hobson, @plonkster and others as well.

Can somebody explain the difference between these two models. Obviously, I need to know the other differences beside power rating difference i.e. 5KW vs 5.5KW. The other differences as obvious from their datasheet such as PV Operating Voltage Range etc. that I can get from their datasheets. I am more interested in know the capabilities to maximize the use of solar and saving on electricity costs specially when using source priority SUB vs. SBU. Looking forward to hear from experts. Thank you in advance.

@Coulomb, one more question, will inverter be doing the same with CRC while sending its response back? In other words, while validating the CRC I got with the message I should consider 0E actually means 0D, right? Thank you for your help.

It worked. THANKS A LOT.

You are HERO.

You are here. I was not considering this. Will try it.

I am currently working on a python script to monitor my Infini V 5KW inverter through USB. So far I have been successful in overcoming several issues however I am stuck at a point where when I attempt to set the 'Output Source Priority' to 'Solar-Battery-Utility' option, it refuses to accept command. It uses P18 protocol. On the other side if I try to set it to 'Solar-Utility-Battery' it works fine. In short I am able to set it to SUB but it refuses my command to set it to SBU. What could I be doing wrong?

@superdiy I have a question. Looking at Delphi code above, it looks that appending the final <CR> at the end of InpStr is the final step just before sending it to the inverter, right? Because I don't see this is being done at least in this code. Which also means that the CRC calculation should be done for every thing except the last <CR> character. As an example CRC should be calculated for ^P005PI and then after appending it as ^P005PI<CRC> then CR should be appended such as ^P005PI<CRC><CR>. Please confirm.

Excellent work!

SSRs usually have very small leakage currents (typically few micro-amperes) while they are off. I am not sure if it can effect any kind of sensing of GTI or any other devices, but it is just an aspect to consider before using them.