My plan on two systems

Hey there, some of you may have seen my other thread on a BMS problem, where i attached a few pics of my first system, but here goes anyway.



That's 3 panels of 340W each, ending on an Easun 3,2 Kw inverter, and the rest of the setup contains a Lithium-Ion 118Ah 24V battery, and a JK BMS.
I'll be coming back with more pics of the parts, and questions soon. This system is not yet running, due to the BMS needing to be replaced (i blew it up).
I'm a complete newb on solar power, so keep that in mind please.
This first system is targeted towards powering my lab where i estimate the needs not being more than a Kw of power.
Once this is complete and operational, i plan to build a second bigger system, of around 5-6Kw, to cover some of the main houses' needs.

Here's some more pics. That's the Inverter and you can see next to it a set of circuit breakers for the battery and the panels. Plus a surge protection.





Some cable management needs to be done of course.



That's the BMS model, which will be replaced by an identical one.




And that's the specs of the panels.

Ok, so, there's no fuses yet, just the circuit breakers. Can anyone suggest what type and rating fuses i need to install? My guess is that i need a fuse right after the battery, and perhaps right before PV IN on the inverter? As this is in Europe, we're talking about 220VAC (if that matters at all).
This system is totaly independent from the rest of the house, but i'm actually considering having the AC-IN hooked up some time, just in case.

As long as the PV breaker is properly rated I don't think you need a fuse on the PV in. I use MC4 inline fuses on each series strings rated for just above the max amps each string produces.

A class T fuse directly connected to the battery terminal is ideal.

KnobCountry said:

As long as the PV breaker is properly rated I don't think you need a fuse on the PV in. I use MC4 inline fuses on each series strings rated for just above the max amps each string produces.

A class T fuse directly connected to the battery terminal is ideal.

Click to expand...

Thanks for replying, I hope you excuse my ignorance, but even some of the terminology is new to me! When you say series strings, does that mean battery packs? Am i to understand that all i need is a fuse on the positive terminal of the battery? (I've only one 24v 118Ah battery pack on this system)

I'd like to take the opportunity to mention a few details on my energy-saving plan. I moved to this house a little over a year ago, and autonomy was always a top priority for me. So, after i manage to complete this first small solar system, i intend to proceed with a bigger one.
Primarily started with the small one so i can get an idear of how things work. Most of my second systems' parts have already been bought.
In a few words, an 6,2 Kw Hybrid inverter, and eight 540W bifacial panels. But i won't go into more details on that for the time being.
Anyway, in order to keep energy needs as low as possible, i decided to purchase "Class A" appliances as we tend to call them in Europe. This means that they're as power-hungry less as possible. Additionally, as has been usual here in Greece, i've also installed a 200-Litre solar water heater on the roof. I can assure you that i've only had to switch its' power less than 10 times during more than a year, and only during the winter time.
That by itself is already a big savings thing.

If you wonder what the big black barrel is next to it, it's a pressure tank, due to the low pressure of the water network of the area.
You may also notice on the same picture a few real small solar panels. Now, those are 20 and 25 Watt panels which i have installed aplenty on the roof, for both interior and exterior lights.
At sunset, all four outside walls of the house remain lit until dawn. Every room in the house has a dedicated miniature solar system just for lighting. Not only for economy purposes, but due to some frequent blackouts we had last year. I really hated having to light a candle every now and then during the first months!
Lights are in the form of LED strips mounted on every rooms' ceiling. And it's actually very acceptable!
Here's an example of it in use in my "mancave"



And a picture of one of the boxes during assembly:



And the kitchen as another example:



We only use the "regular" lighting in the house out of bad habbit some times! Reason i'm posting these details is to stress the fact that i'm trying
to lighten the burden out of the second solar system i intend to install as much as possible.

Love the ideas.
I have a plan to run native 48v led lights all over my house so I can actually turn the damn inverter off in an emergency.
I suppose I would need to run the fridge, but there is where the Victron Phoenix inverter will come into play. Super low idle and eco modes. Perfect for a fridge.

KnobCountry said:

A class T fuse directly connected to the battery terminal is ideal.

https://imgur.com/WsfU3u1

Click to expand...

I can only find 100A and 150A T fuses locally, so i was wondering if any of those would be ideal or not? Otherwise i'll have to shop through some foreign site. Since the battery is 118Ah, what would be the best value for the positive terminals' fuse?