Final Draft System Review - Missing anything?

[medic149]

I've been learning a great deal on here and would love to get input on my system schematic.
This is for an off-grid cabin. I've already purchased the LV6548 and batteries.

Let me know if off-base on anything or missing something.

Thank you in advance for your help.

 

[Jack2of3]

Appears to be covered. I've got two LV5048 in parallel with 12 Battleborn. Zero issues and trouble free.

 

[Solar Newbee]

Question, since the LV5048 Voc is 145Vdc, does that mean it is 145Vdc on each PV connection or is it for the whole LV5048 unit.

 

[Jack2of3]

Each unit has 2 MPPT at 145 each, 4kw each

 

[Solar Newbee]

Thank you Jack2of3. I've been trying to get that info from the MPPSOLAR manufacturers with no luck. You've settled my nerves! Now I just need to source the right solar panels that will give me the 4000kw each. Do you have any idea/recommendations on the watts and size of the solar panels?

Thanks Solar Newbee.

 

[Jack2of3]

Mission Solar in San Antonio has a good selection at reasonable prices with all the specifications. They prefer you tell them what you want vs asking them to tell you what you need.

 

[RJuelfs]

Santan solar. 3000 Watts shipped to NH for about $800

 

[Jack2of3]

Have you watched Will's reviews on Santan? Some good, some not so good if I remember correctly. Could be some were new and others used.

 

[RJuelfs]

I was happy with the product I have for the price I paid, but I believe that it is a gamble.

 

[Jack2of3]

Yeah, I wanted dependable, easy and warrantied.
If I knew then what I know now I probably would have went with the Gyll batteries over the battle born just for cost. Shop around. Solar panels are dropping in cost. No issues at all with the lv5048.

 

[Solar Newbee]

Jack2of3, Yes I did see Will's review on the Santan panels. Thanks you all for you valuable input. I will definitely shop around.

 

[Solar Newbee]

Jack2of3- When you mentioned, "Each unit has 2 MPPT at 145voc each 4kw each", is that 4kw of solar panel per LV5048 or 4kw per MPPT?

Thank you.

 

[Solar Newbee]

Medic149- what were the watts on each of your solar Panels?

Thank you

 

[Solar Newbee]

Mission Solar in San Antonio has a good selection at reasonable prices with all the specifications. They prefer you tell them what you want vs asking them to tell you what you need.

Do you have a website/contact information for this company? Thank you

 

[Jack2of3]

Do you have a website/contact information for this company? Thank you

Just Google mission Solar San Antonio

 

[Jack2of3]

Jack2of3- When you mentioned, "Each unit has 2 MPPT at 145voc each 4kw each", is that 4kw of solar panel per LV5048 or 4kw per MPPT?

Thank you.

4kw per mppt

 

[Solar Newbee]

4kw per mppt

Thank you Jack2of3. I'm trying to figure out my solar panel configuration in order to get 4kw per mppt. What is the series/parallel combination that you use or would work to give me 4kw per mppt without going over 145voc per mppt? I spoke to a Michele Ladd at Mission Solar and this is Mission Solar's answer- "We have 60 cell 345W modules that output 41Voc, datasheet attached. These can be arranged with 3 on a string, reaching the maximum Voc per MPPT, but only 1,035W’s. To get to 4kW you can combine 4 parallel strings. This layout suggestion is outside of the scope of my role here at Mission Solar and should always be verified with the inverter company, sales@mppsolar.com."

 

[Jack2of3]

Mission Solar is correct in their suggestion however, you need to be careful in approaching the maximum VOC and wattage. I.e. I only have 10 200 watt panels, 2 strings of 5 run into a combiner box. I have observed twice, the wattage reading at 2.2kw, more than the panels should be able to output by their specifications. Personally, not a professional guide by any means, I would allow for a 10-15% cushion of the rated output of the panel configuration for VOC and wattage to the allowable maximum for the MPPT. All that said I would use 3 strings of 3 in parallel of the 345 panels for 123 VOC and 3.1 kw. Each MPPT can handle 80 amps so that won't be a concern.

 

[Solar Newbee]

Jack2of3- Thanks for the feedback. So you are saying 3 strings, meaning three 345w panels in series, and 3 of those strings in 3 string parallels, correct? So I would do this for each MPPT connection? So each MPPT connection would have 3.1kw of solar panel? Thanks.

 

[Jack2of3]

That is correct. I've decided to go with the PERC 60 panels in which ever wattage offered is cheapest using 9 panels so 3s3p also.