MPP-SOLAR LV6548

[jasonhc73]

Little confused.
At 120a PV max input x 48v only equals 5750w as the max PV input. 6500w ÷ 48v = 135a, so why 120a max input. So it can't handle 6500w input? Am I missing something? Do I need another solar controller to get another string to get to 6500w in if I can use 6500 out.

If you use very common solar farm and residential panel of 250w 38v, 5 of them gives you 190v x 1.2 for cold coefecient = 228v so a series of 5 is your max with our cold desert mornings. Then if you try to get to a maximum amount of panel input it almost does 5s5p.

250w x 5s panels =1250w x5p = 6250w then ÷ 48v = 130a input???

So if you want the highest voltage for the least voltage drop/smallest wire then you would have to do 5s4p = 5000w and then 3s for the remaining 750w??? I was thinking run the strings into a solar combiner but how does 3 panels 140v paralleled onto 5 panels 228v work? Is that possible or should I get a controller to handle 5 more panels. I have 50 panels. So if I do 5s4p that leaves 10 panels unused.

Connect all your panels and measure the VOC with a multimeter. If you are under 250V then there you go. Only use the VOC number. Don't complicate it with any other value.

Make a series string of panels as close to 250V VOC AS POSSIBLE. then copy it exactly to make a parallel string. You do not need a combiner box if the panels are less than 10 years old, they all have diodes to prevent reverse charging. Instead of the combiner box use a branch connector. It joins two MC4 into one.

 

[Stewfish]

Connect all your panels and measure the VOC with a multimeter. If you are under 250V then there you go. Only use the VOC number. Don't complicate it with any other value.

Make a series string of panels as close to 250V VOC AS POSSIBLE. then copy it exactly to make a parallel string. You do not need a combiner box if the panels are less than 10 years old, they all have diodes to prevent reverse charging. Instead of the combiner box use a branch connector. It joins two MC4 into one.

So whats the 120a refer to?

 

[Stewfish]

6500 is the AC watts output.

8000 watts MPPT solar max input (2x4000 on 250V max strings)

48v is the battery "area" of voltage. (vs 24 or 12)

LV5048 vs LV6548
View attachment 32519

LV6548 in split phase.
This setup can do 13kW AC 240V split phase output. It has 16kW solar input, as 4 4000W MPPT inputs 250V max each string.
View attachment 32520

So, I thought the 120a was max PV input. So is it 250v x 120a = 30,000 watts max?

Where did you see 8,000 watts?

 

[Fahmula]

So, I thought the 120a was max PV input. So is it 250v x 120a = 30,000 watts max?

Where did you see 8,000 watts?

Here, page 9 in the manual.

 

[Stewfish]

Here, page 9 in the manual.

Oh that's awesome I don't know how why I thought 120 amps was Max input maybe cuz it said input nominal voltage anyway thanks a bunch makes me a lot happier and now I know I can run 25 panels off of one and 25 panels off another so my original plan looks like it's all going to fit together well thanks again pardon my voice to text grammar

 

[Stewfish]

I'm so glad I got these. The more I read in the manuals and forums the more good stuff I hear. Now just to wire them up

 

[Fahmula]

I'm so glad I got these. The more I read in the manuals and forums the more good stuff I hear. Now just to wire them up

What size battery bank you hooking up to these?

 

[Fahmula]

Oh that's awesome I don't know how why I thought 120 amps was Max input maybe cuz it said input nominal voltage anyway thanks a bunch makes me a lot happier and now I know I can run 25 panels off of one and 25 panels off another so my original plan looks like it's all going to fit together well thanks again pardon my voice to text grammar

You can have up to 16kw of solar panels.

 

[Stewfish]

What size battery bank you hooking up to these?

28kwh

 

[Fahmula]

28kwh

Lifepo4? If so what BMS you’re planing to use?

 

[Stewfish]

Lifepo4? If so what BMS you’re planing to use?

I got the 280ah cells like Will just did a video on, but from alibaba. There is a thread on here about them. I was going to do 16s daly BMS until I get a chargery BMS running. I need to research those more for the relay requisites for my possible amps needed. The dalys were fairly cheap to add onto my order $150 I think and the chargery doesn't seem 100% in my head yet. The heat on the chargery relay can get to 200 degrees and eats up energy. I bet the 250a daly eats up a bunch of standby power too. Electrodacus doesn't have 16s 48v and I'm trying to keep the BMS cost down. Some get up to $800. Somewhere in my replies/threads I worked out all of that if you want to learn. Some people also made recommendations for the relay needed, but I haven't had time to get into it deep yet.

 

[Fahmula]

I got the 280ah cells like Will just did a video on, but from alibaba. There is a thread on here about them. I was going to do 16s daly BMS until I get a chargery BMS running. I need to research those more for the relay requisites for my possible amps needed. The dalys were fairly cheap to add onto my order $150 I think and the chargery doesn't seem 100% in my head yet. The heat on the chargery relay can get to 200 degrees and eats up energy. I bet the 250a daly eats up a bunch of standby power too. Electrodacus doesn't have 16s 48v and I'm trying to keep the BMS cost down. Some get up to $800. Somewhere in my replies/threads I worked out all of that if you want to learn. Some people also made recommendations for the relay needed, but I haven't had time to get into it deep yet.

Those are the cells I'm getting too. Daly BMS seems like a good option but as will states, he wouldn't use it for a storage solution. I would like to have a BMS capable of 12kw of power even tho 80-90% of the time it would be operating well below that.

 

[Stewfish]

Those are the cells I'm getting too. Daly BMS seems like a good option but as will states, he wouldn't use it for a storage solution. I would like to have a BMS capable of 12kw of power even tho 80-90% of the time it would be operating well below that.

Same exact thoughts.

I need to watch this, looks like a new Chargery vid about the relays and stuff. In the comments a guy says use a latching relay, another says find a continous duty relay and that the one in the vid is probably just a starter relay.

 

[jasonhc73]

Unknown feature of LV6548

When grid-connected, you can charge the batteries at only 2 amps.

I just blasted my car with 7600W (32amp EVSE) and charged the battery at the same time at 2 amps (actually 4 amps since I have 2 in split 180° phase), oh, it is also 25 °F.

When I charge my car, the EVSE plug is the first thing out of the LV6548 set, it doesn't go through the house. (Until the battery bank gets drained)

 

[Fahmula]

6500 is the AC watts output.

8000 watts MPPT solar max input (2x4000 on 250V max strings)

48v is the battery "area" of voltage. (vs 24 or 12)

LV5048 vs LV6548
View attachment 32519

LV6548 in split phase.
This setup can do 13kW AC 240V split phase output. It has 16kW solar input, as 4 4000W MPPT inputs 250V max each string.
View attachment 32520

The 6548’s are so much smaller! Btw the manual calls for 50 mm clearance on the top and bottom. Is it necessary?

 

[jasonhc73]

The 6548’s are so much smaller! Btw the manual calls for 50 mm clearance on the top and bottom. Is it necessary?

50 mm is 2 inches, it is for air circulation. The entire bottom part where the panel is, comes off when you connect the DC and AC wires, the entire sides and bottom are just 3mm (3/16 inch) holes.

There is nothing on the top for air to flow through, it really doesn't matter. The mounting tabs stick up 1 inch (25mm) anyway so you have that for clearance, and the PV inputs stick down 2 inches also, so even if you tried to stick them end to end, you simply can't because of wires coming out.

 

[Fahmula]

50 mm is 2 inches, it is for air circulation. The entire bottom part where the panel is, comes off when you connect the DC and AC wires, the entire sides and bottom are just 3mm (3/16 inch) holes.

There is nothing on the top for air to flow through, it really doesn't matter. The mounting tabs stick up 1 inch (25mm) anyway so you have that for clearance, and the PV inputs stick down 2 inches also, so even if you tried to stick them end to end, you simply can't because of wires coming out.

My bad, I meant 50 cm. I was just wondering as I’m working with a tight space.

 

[jasonhc73]

My bad, I meant 50 cm. I was just wondering as I’m working with a tight space.

My bad also. THe book does show 50 CM. That seems way too much to me. But that's what being "safe" is.

I would be most concerned on the sides, where the vents are. Top and bottom not so much really matters.

 

[Fahmula]

My bad also. THe book does show 50 CM. That seems way too much to me. But that's what being "safe" is.

I would be most concerned on the sides, where the vents are. Top and bottom not so much really matters.

Yeah I thought so too. 50 CM seems excessive. Do you have a video of them in action? Also would love to know the idle draw.

 

[jasonhc73]

Today I noticed that you can get solar capture data from the front panel.
It has data for Today, Week, Month, and the Year.