Pink7

That was a good price on the Growatt Inverter you got. Where you buy? Good luck with the project. Pink

+1 Yes I agree on all you mention. Pink

Yes that was a important part of my whole plan for batteries, inverters and BMS etc to run everything on moderate capacity and not push any limits for longest possible life of the setup. My guess is that my mid level brands equipment do not have same ability to run near limits over same time as more costly brands. Pink

I have Lifep04 280a 3.2v cells. From the numbers on JK BMS i see i average have around 60%/150-160A capacity left in morning per battery. I have 2 batteries with 16 cells each. Pink

Yes your panels do look easy to clean. Charged before lunchtime is great. This time i have 80% or so of the capacity i had some months back before sun turned more to the other side here but still doing ok. So now fully charged an hour or two after lunch time on a average day. Pink

The material of this type cleaner seems to be gentle and very suited for solar cleaning. We cleaning from a ladder so i need it 4-5meter or so. So a diy extender could be the solution. Pink

Thanks allot.. exactly the kind of feedback i hoped for. Where did you buy your cleaner? Pink

Yes google is a great tool for anything. I still think its interesting to get suggestions and views from the forum members here and also try contribute with some content here. My Solar project would never been a reality to get up an such a successfully way if it was not for this forum and its members. When Im thinking about, it my project is quite big as fist timer solar DIY for someone who not even been near a solar panel before. So let me use this opportunity to THANK to all forum members who contributed with advises. info and help to this project. Pink

Cleaning day today of may panels. They started to look dusty so we just try trow some soap water from the ladder the shower of the soap with the garden hose. I guess there is better tools for this like a tool to to swipe the panels? Pink

My setup is 9kwh panels with 2 x 5kwk growatt inverters and 30kwh battery. All at 300K. Im very happy to have DIY it so i know how its build and how its working so im able to maintain it myself. Its was also quite cost effective. Pink

Just so it will be correct and same as posted other places: Total was just under 31thb Pink

My first fully billed month ended up at just under 31thb. It was one utit electric the rest was fee. Pink

Got my first full month electric bill after going solar: Billed for 1 unit ( +fee) 38 bath. Btw very goos to see aseanow back online. Pink

Some days ago I fully charged both batteries then I calibrated my both JK BMS voltages and I Temporary edited the over voltage protection to a lower value so it be triged and to "help" the BMS to understand this wast the 100% left capasity level. After that the 2 BMS been as in sync and all good. Pink

Be aware that 3 x electric showers might not be able to be used in same time from a inverter capacity of for example 10kwh. I have 2 x 4500w showers but we not use in same time and i not run them on very high power(heat) If I had redo it I had built a sun heated solution. One alternative could to connect your showers to grid and not to the inverter. Pink

Got both batteries charged up today and noticed: Both batteries complete charge in same time ( one with 99% and the other with 97% state of charge) Batteries have exact same voltage when checking with multi-meter. Some differences on the values with BMS. Then inverters show 0.4v more than multi-meter. So all in all not to bad at all but i will do some calibrating of voltage and try reset/recalculate state of charge on the 97% battery.

I used long time to choose my inverters and ended up with 2 x Growatt spf5000es at 27k or so each delivered on my door. You can save a few thousand going cheaper but for me Growatt was the best value deal from my research. I planed this for last long time so i not push any limits and have a bit more capacity than needed. My solar input is 270v and my near 10kwh panels at it most does 7kwh. First i had the idea to do in 2 or 3 steps but then I conclude that for me much better to get it all ups in one project. All In all I spent more or less exactly 300k for all ( 30 kwh batteries included) Pink

Thanks for the info. I will just get both batteries charged back up to full status if the weather hold up. Pink

Is it voltage or the Current (Ah) level who make the parallel connection to transfer current between the packs? Pink

Yes they are in parallel with wires between the 2 breakers. Pink

Update: Just come to my main that the 2 JK BMS do not communicate with each other so then that part of my idea will not help, but the inverters do communicate but does they do anything related to manage how much current to charge/de charge each battery/inverter pair? ( INV1/Bat1 vs INV2/Bat2) Pink

So I have do some more checking and 2 times switch to charge the one battery only to balance the current between the 2 batteries. What happen next is the bms will reverse my operation by less charge current to the battery I just charged up to same level. I also noticed that voltage on the battery who BMS now give less charge have a slight higher voltage so i gues thats maybe why this happens. My first thought is to get both batteries back to fully charged and then I guess or hope there is a voltage calibrate option on the BMS. Pink

Thanks for that input Crossy. I just switched to charge the one battery with both inverters to close the gap (30Ah), and was able to see in app that the current made sense at least on lower current. Yes cables are quite equal in length. Pink

Last day I got quite allot of difference Amp level of my to batteries and i wondering if my parallel cables between the 2 breakers not doing the job as i should. Today i tested to close down the battery with most Amp to get more Amp on the one with less, but I see much less Amp on the parallel cables than I wold expect. I will try investigate this and try collect some more details on this. My setup use cables between the breakers instead of busbar. Pink

First month on solar completed. The whole month home was 100% run offgrid and produced 701Kwh. Im very happy with the level of power production even in cloudy days. Last days with much rainy weather I have been able to keep it going with good power management but last nigh not so this morning the ATS flipped at 06 or so. Then 2 hours later when battery voltage over over 50v it flipped back to solar power. So now that part of the system tested also. I use a external ATS from my inverters, I dont feed grid power to my inverters. I was happy to see my PC did not needed to restart when the ATS flipped. Pink