RikH

First find out what you're Mecer is called in "MPPsolar language". After that you can look up your settings in this document: Pylontech inverter setup SOP.pdf Also you can make a connection via ICC software.

Ok, interesting. Sometimes I use a tool that the EU government uses thats quite accurate as well. I'll give you a link when I'm back. Have to go now. Quick update before I go: https://re.jrc.ec.europa.eu/pvg_tools/en/tools.html

Exactly, you will have to clean your panels more. About this picture, where did you get that from? @DeepBass9 Its not as bad as you would expect but then here in Holland we still have netmetering so its much easier than the situation in SA.

Ah ok but that's not what I meant. I mean the other side of the sonoff, how do you send messages to it?

Hi Fazil, I know this may sound odd to many but why not laying the panels flat on the roof? Like this. I made this for a customer in Purmerend which is 52,5 degrees north of the equator. SA is closer to the equator so should give even better results.

What are you using to control the POW R2 after flashing it?

Yes it will still work but... 97 x 330 = 32.010 Wp (mind the p). So this is the peak power you will almost never reach. So I would advice you to take 2 x 15k or when it is cheaper, 1 40k Solis. Keep in mind that these grid-tie inverters have the best efficiency when on their max.

Not at all boring. Very interesting I would say. Following!

Hi @Gunners, interesting. Just curious, is this solved now? If yes, how? If not, have you tried to switch master and slave around?

I wouldn't go 6 or 7s2p because the specs on Voltronicpower say max 500V and 5000 Watt. That makes 10 A so with your panels you can only go 1p. though I agree with Coulomb that its better to overshoot the amps then the voltage. Best / cheapest solution would be 10s and if you need the other 2 panels as well buy a cheap MPPT charge controler for these 2.

Haha now I understand... 😅

57.2 V?? How can that be a solution since the Pylontech BMS trips at 54 V?

Found it and installed it. That's a very nice piece of software, thanks for pointing me in that direction Fuenkli!

Well I just made a simple box for 1 string appr. 800V. As you can see it has surge protection and a breaker/fuse. Don't expect the fuse to trip in short circuit situations, the range between Imp and Isc is to narrow for that. So I just use it as a switch. On the side of the inverter I would suggest a switch like the one shown below. @HennieJH should of course make it double with the appropriate values since he has 2 strings.

Looks like you have decided to buy a very nice set indeed! About the PV side of things I would not suggest a combiner box. See these specsheets for the inverter and for the solarpanels. As you can see technically there is space for 6500/330=19 panels. So if the budget is there and the surface is big enough you should consider to buy 4 more of these panels. Do that before you buy all the batteries if your budget is insufficient because solarpanels often are suddenly not available anymore in the same size or specs. About the combinerbox: not necessary cause you can hookup 13 or 14 of these panels (depending on wintertemperatures) in series per mpp tracker voltage wise. Edit: In the mean time I wrote this Fuenkli posted a very nice diagram. He has adden some surgeprotectors as well. Thats a nice lightning protecion I would recommend. @Fuenkli what did you use to produce this diagram?

This one could be the one you're looking for: Chargery BMS8T

What type of LFP battery do you need the BMS for? 16s? Ah?

That's a pity, damn! In that case the idea of getting a industrial 48V charger is maybe the cheapest and most reliable. There are chargers on the market for forklifts etc. Guess they are way cheaper then a MPI 10kW. Still it bothers me that there is no solution build inside. Is there a possibility we're overlooking something?

Ok thats a solution that should work. But how can you automate it? Just a thought, I guess you have your first inverter (master) connected to the grid(L1) via grid connection of course. Now what will happen if you disconnect the grid connections from inverters 2 and 3 (L1 as well I assume) and instead you connect L2 to the generator input of inverter 2 and L3 to gen input of inv 3?? Maybe you charge via the gen input and give power to the load connection in fase with L1? Use dry contact to start gen to close a relay that connects L2 and L3 to the inverters. That would be interesting.. Rik

Thanks for your answers Youda. But it raises more questions. This is what is bothering me: what if there is no sun and your batteries are almost depleted. How do you get the whole house running from the grid? I expect you have a three fase connection or do you have one very strong fase coming in? Long question short; if you have a demand of lets say 40A in the house and there is no sun and no battery left where is it coming from? Just curious.. Rik

Hello Youda, thanks for your detailed reply. I bought my inverter from MPP solar. Maybe I ask them for these covers. May I ask what you paid for the pylontechs and what the name of the supplier is? You can send me in PM as well. 15 kW is a lot on 1 phase, we're talking about 65 A. What is the max you draw from the grid and how much do your push back with you solar when batteries are full? Thanks again! Rik

Very very nice setup Youda! Impressive! I have a few questions if you don't mind: How did you parallel the inverters, 1 phase or 3? I see you have this nice cover around the AC connections on the inverters, where they provided with the inverters? (I have 1 Infini 5kW but not these covers) Where did you buy the Pylontechs? Regards, Rik