Fuses / disconnects / breakers for 2 LV6548 system

[timselectric]

Good enough for me, thanks.

 

[John Frum]

The test I did was using a roughly 24 inch 2/0 cable, connected directly to the battery terminals: Result - BMS turned off the power.
Bypassing the BMS with the same cable: Result - tripped breaker.

Sounds like a dead short to me, thanks.

 

[John Frum]

The test I did was using a roughly 24 inch 2/0 cable, connected directly to the battery terminals: Result - BMS turned off the power.
Bypassing the BMS with the same cable: Result - tripped breaker.

This would be some good YouTube content.
Seriously.

 

[Solar Guy Richard]

This would be some good YouTube content.
Seriously.

Ya, I was going to get a video of the test but it was literally a "oh I'm walking by the workbench let me do this test people want real quick" moment and I'm in the middle of another larger project. I'll get a video on it asap though.

 

[CamoGreg]

TFB1-150, 150A Class T Fuse Kit | DonRowe.com

The TFB1-150 offers 150 amps of over-current protection and provides safe operation of your inverter.

www.donrowe.com

$49.99 * 6 = $299.94

Out of stock until mid May.
Edit: fuses only. Full kits are available.

 

[John Frum]

Out of stock until mid May.
Edit: fuses only. Full kits are available.

Luckily the built-in breaker can quench a dead short.

 

[JonnyWatt]

Building a off grid / grid assist system with 2 LV6548 and a bank of 6 EG4 48v batts
using 48 used 250 watt panels. planning 6s2p for 3000 watts to each of the 4 mppt inputs 12kw total
I have a few questions on fuses etc

1. T fuses between inverters and batteries..should I be using 200 amp or 300 ?

2. I have 4 strings of panels, I need 4 dc breakers at 30 amps, what are a lot of you using for this ?

3. A/C input, the inverter manual seems to call for 4ga wire for AC input and output. how many amps are being fed in ? and how is it divided to serve both LV6548s ? separate breakers and wires to each inverter from the main panel ?? should I install a a/c disconnect for the ac input ?

4. what is a shunt ? and do I want or need one ? Ive seen smart shunt that sends battery info


thanks for any advise

Texican, I too was looking for EG4 battery bank to work with LV6548. I spoke to watts247 who said EG4 not communicate with LV6548, and was recommended Pytes 5.1KW batteries; pretty slick how batteries connect in parallel with snapon cable clips. I also saw Will Prowse using SOK 5.1KW batteries with LV6548. I'm trying to decide which ones to get (Pytes or SOK), but really like EG4.

 

[FilterGuy]

and was recommended Pytes 5.1KW batteries; pretty slick how batteries connect in parallel with snapon cable clips.

Could you provide a link to these batteries?

 

[JonnyWatt]

Here is the battery descriptions on watts247: https://watts247.com/product/pytes-48v-5-1kwh-rack-mount/

Here is the video of watts247 (I think Ian is the owner) who showcases these batteries in this video: :

 

[Texican]

Texican, I too was looking for EG4 battery bank to work with LV6548. I spoke to watts247 who said EG4 not communicate with LV6548, and was recommended Pytes 5.1KW batteries; pretty slick how batteries connect in parallel with snapon cable clips. I also saw Will Prowse using SOK 5.1KW batteries with LV6548. I'm trying to decide which ones to get (Pytes or SOK), but really like EG4.

I am using solar assistamt for a brain on my system, still having issues with it seeing the eg4 bank, only sees 1 battery right now, solar assistant emailed me and thinks I have wrong batt ID set up so I will be checking that

 

[timselectric]

I have a question on a somewhat related issue, not sure if anyone can offer any guidance.

I’m trying to understand the wiring diagram and circuit breaker requirements from the main breaker to 5 LV6548 inverters AC input, then the 5 inverters AC output to sub panel?

Inverters 1-3 are in 1st phase, inverters 4-5 are in 2nd phase.

Plan is to program LV6548’s to provide power by priority: 1) solar (19.6kW); 2) batteries (41kW); 3) grid.

What I have gathered from other threads, for split phase with two units I would install a 60a 2-pole circuit breaker on main panel and run one hot to 1st phase inverter and one hot to 2nd phase inverter. Then I would run AC output for both inverters to the sub panel to another 60a 2-pole circuit breaker.

Not sure how to configure this for 5 inverters?

Also, intermittently to reduce idle energy consumption and when high demand is not necessary, the plan is to turn off inverters 2-3 of 1st phase and inverter 5 of 2nd phase to run system with 2 units in split phase.

I have not purchased the sub panel yet, the main panel is a Square D Homeline, so any input on sub panel models with 40 spaces or more in the same line would be appreciated so I can recycle all the current circuit breakers by transferring them to the sub panel.

I’ve also considered a “smart” sub panel (i.e. Lumin) for load management. Experience in this area is appreciated as well.

Thanks for any guidance.

You should start your own thread. To avoid confusion.