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Finally after 18 month I've completed the installation of my DIY off-grid system. It was an incredible amount of work, much much more than previously expected. Tomorrow will be the final inspection of the cities building division and on Friday the inspection of the power company - I'm very...

I want to let you know, that I also found a solution about the usually ugly cable wiring for parallel inverter communication and current sharing between the inverters which was even worse after connecting 6 inverters individually to SA. I found a low profile, open slot, cable channel...

2nd YEAHHHH... today I've just got the final approval from the local electrical energy provider :) :cool:(y) At 11am I've flipped the manual transfer switch to "Solar Generator" position and I hope I never need to flip it back (I'm an optimist ;)). Over the next couple of days I will post...

I've finished some 3D test prints with the duct adapters for the inlets on the outer located inverter and between two inverters. Also I've made some brackets where I will be able to slide these adapters upwards to be able to access the screws and filters to service them. On top of the round...

The 18k was not available 18 month ago. I hope I will not regret to choose the EG4-6500EX because it's sunset now. But they are working great so far and it was (at this time) an unbeatable price for a 6,500W inverter, 6,500W AC charger and 8,000W PV with 500Voc and two MPPT's. I would have loved...

YEAHHHH... with one day delay, I've just got the final approval from the cities building division :) :cool: (y) Now there is only one step left (hopefully tomorrow), my local electricity provider want to inspect and approve the typical "generator setup" of the system with the manual...

Just to share my observations about this product with you - it works great in my situation: Trane heat pump XR14-4TWR4060G1000AC (5 ton - 60000 BTU) Micro-Air EasyStart 368 Soft Starter (ASY-368-X72-BLUE) The heat pump is specified with 144 LRA (locked rotor amps ) and 24.4 RLA (rated load...

Ok, I've successfully implemented 3 of these PWM temperature controllers between the three existing fans.On the right side I've installed two of these PWM controllers for the two inverter unit fans and connected their temperature probes to the two heat sinks (existing holes can be used to screw...

I’d like to share my findings with you so you may not run into the same problems. After trying for quite a while, I finally have reliable communication between SolarAssistant (SA) and all inverters and batteries. My setup: 6x EG4-6500EX-48 inverters in split phase 3 inverters per phase all...

I had bad flickering LED's on one of the two phases. After a couple of days/weeks searching the cause of the problem, I finally found it. Environment: 6x EG4-6500 in split phase, batteries only (no solar so far) I've checked/tried everything like checking for N-G-bonding problems parallel...

I've created a wiring diagram for my own documentation and it may be useful for others, also.

Thanks! Long ago in 1992 I've got my diploma at an university of applied sciences in electrical engineering in Germany. But I've never worked as an electrical engineer, instead I've started my working life as an hardware-related software developer (protocols, drivers, etc.) and still doing...

I've promised my wife that she will not have comfort loss and she does not need to depend on sunshine to do what she wants to do (cooking, laundry, etc.). Also I didn't want to tell her things like "please turn off the oven because I need to use my miter saw.., etc.". For me it was clear that I...

As I wrote in my original post, I'm still in building phase and PV, AC-out and AC-in are still not connected - just the batteries (which had 50% charge when arrived). In the last picture you may notice, that the 200A breakers in the AC-in panel (on the very right side) and the AC-out panel (left...

Finally I've finished the work on the active mini split cooling for the AIO's. Now I hope that the fan's will never speed up to full speed anymore with the modded temperature controlled fans. -------------- The 9,000BTU concealed ducted indoor unit is more than enough to cool the system down...

I had no choice but to install everything in the attached garage and that's the reason why I've done a huge effort to implement these emergency shutdown features (I'm also sometimes a bit of a chicke ;) ). Here are the passive and active security measures (also used to impress the inspector...

I think I found the answer by myself. It's the Voc temperature coefficient which explains the voltage drop very accurate. At about 60°C PV module I will loose about 9.2% voltage which is about 18.4V and together with the wire resistance loss of about 1.6V it will perfect explain the 20V dip...

After 3 days of operation I will tell you about the first impressions and share some initial diagrams. The average consumption load per day was around 55 kWh at this time of the year Solar production was around 72kWh per day The max. seen peak power load at a time was 12.9kW over the last 3...

I'd like to share my 3-wire diagram of the system (overall and zoomed for better reading): In case someone wants to know about the controller circuit, here is the schema:

Usually, it would not be too much effort to change the behavior a little bit to save energy (like most off-grid people are doing - it's a bit of the feeling to do a small part to save the planet) - but because the sun is for free and the batteries are there and the system have enough power, it...

Do you have enough space around your house? Maybe small hills? If both answered with yes -> Pumped Storage Hydropower ;)

Typical off-grid charts explains the situation: Before the next solar production begins at about 6am, the batteries had a remaining SOC of 62%. In my situation it took from 6am to 12pm to charge the batteries from the remaining 63% to 100% SOC and in this time, the maximum possible power was...

btw, Too dangerous, because they can, by mistake, fold back and touch the busbars from behind. The only way would be to remove the handles. I don't want to do this for handling reasons - this batteries are heavy! Also I know, SS have racks which fit this battery version (the yellow one). Here...

I'd like to post a short update. Still no solar panels installed (still way too hot here) 2-pole transfer switch (common neutral) installed AC-in connected to grid 24,000 BTU mini split in garage installed to reduce the ambient temperature (at least a bit down from around 100 Fahrenheit)...

This is how I've done it

Just a short update after 17 days online: never connected AC-in to the grid until now 960kWh consumed, 1356kWh PV production results in an overall efficiency of about 71% (not really good but acceptable) about 430 starts of the 5 TON central heatpump (with soft start installed) - no failed...

First I was planning to use a plastic enclosure (https://www.amazon.com/gp/product/B08NCZTTW3) but I've learned that PV wiring MUST be installed in metal conduit and metal enclosures to get a permit if it's inside a building! So I bought this metal enclosure...

It's no rocket science, just a bit of electrical engineering, don't overrate it. A little basic knowledge, enough care and enough patience are often enough.

Like a redox flow battery? Edit: I found this guy who built a DIY vanadium redox battery demonstrator (he has a whole series of videos on it).

I have a 280AH 12V LiFePO4 DIY battery on a 3000W inverter ("Go Power!" GP-ISW3000-12) and I've tried the following: The type of breaker you've mentioned in the link (but with 300A) - failed! gets way too hot in regular usage (even <<100A) An ANL 300A fuse...