MPP LV6548 - Solar Panel Research

[medic149]

Just purchased my MPP LV6548 and have my LiFePO4 battery cells coming as well.
Now, solar panels.

Does anyone have any thoughts on these cells and if they will work with the MPP LV6548? Appreciate any thoughts or help you can provide.

Reference		Mission	Prisim	Trina
	Example
	330Wp	385	385	400
VMP	33.7Vdc	40.84	40.8	41.1
Imp	9.79A	9.426	9.43	9.74
Voc	39.61	48.53	48.5	45.4
Isc	10.4A	9.993	9.99	10.18
Cells	60	72	72	72
Efficiency	%
Cost		$ 155.00	$ 155.00	$ 200.00

I am looking at getting as close to 8000W as possible with the fewest panels as possible while staying within the MPP requirements.
The LV6548 example is listed above and the data from the manual is below:

USER’S MANUAL

INVERTER MODEL	LV 6548
Max. PV Array Power	8000W
Max. PV Array Open Circuit Voltage	250Vdc
PV Array MPPT Voltage Range	90Vdc~230Vdc
Start-up Voltage (Voc)	80Vdc

SOLAR INPUT 1	SOLAR INPUT 2	Q'ty of panels	Total Input Power
Min in series: 3pcs, per input Max. in series:6pcs, per input
3pcs in series​	x​	3pcs​	990W​
x​	3pcs in series​	3pcs​	990W​
6pcs in series​	x​	6pcs​	1980W​
x​	6pcs in series​	6pcs​	1980W​
6pcs in series​	6pcs in series​	12pcs​	3960W​
6pcs in series, 2 strings​	x​	12pcs​	3960W​
x​	6pcs in series, 2 strings​	12pcs​	3960W​
6pcs in series, 2 strings​	6pcs in series, 2 strings​	24pcs​	7920W​

 

[solardad]

If cost is no issue then just do the Trina

2p5s = 4000w @ 225 Voc @ 18a in ideal scenario
Repeat 2 times (20 panels total) for 8kw.

The math is the easy part in figuring out panel combinations.. the harder part is where can you put them and any limitations based on shading or $$$$.

 

[medic149]

If cost is no issue then just do the Trina

2p5s = 4000w @ 225 Voc @ 18a in ideal scenario
Repeat 2 times (20 panels total) for 8kw.

The math is the easy part in figuring out panel combinations.. the harder part is where can you put them and any limitations based on shading or $$$$.

Thanks! That's what I was looking at. The deal seemed pretty good. The combination might work well for 2 arrays I may use because of location and shading. Thanks again for the help.

 

[Lt.Dan]

Be careful, looking at the Trina data sheet, the 400watt panel is actually 50.4v VOC per panel, and 5 panels in series is over 250v, especially if it gets cold out.