Crazy to add an EG4 MPPT100-48HV charge controller to my EG4...

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Last Post by dfwtinker 1 week ago

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cimedaca

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January 22, 2025 5:31 pm

(@cimedaca)

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I have two sets of 7 Hyperion Solar Bi-Facial Panels 400W already using both MPPT inputs on my 6000XP. Due to shading, on good day PV1 generates 1-3k W for about 4hrs in the morning and PV2 generates about 1-2.4K W for about 4 hours in the afternoon with little overlap. I have 6 more panels that I can install in a different yard location that will essentially give them full sun nearly all day. Would I be crazy to buy a $400 EG4 MPPT100-48HV to replace my lower performing PV2 connection and have it just charge the battery when the voltage is low enough. That would free up my EG4 6000XP PV2 to hook up to the 6 full sun panels when I install them. I don't really have room for another 6000XP, and I have already overspent on my system. The goal is to have excess solar during the day to charge an EV so most of the battery is available for possible critical loads panel backup.

Any advice or thoughts would be much appreciated.

David

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dfwtinker

January 23, 2025 12:52 pm

(@dfwtinker)

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Good Morning @cimedaca

Would it be to possible to Parallel the two Hyperion strings to PV1 and use PV2 for you other set. What are the specs of your Hyperion Panels?. You may also want to plug the figures into the EG4 sizer tool ==> https://eg4electronics.com/wp-content/themes/hello-elementor/eg4-solar-panel-string-sizer/

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cimedaca

(@cimedaca)

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January 23, 2025 2:31 pm

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dfwtinker

@dfwtinker Agreed, I probably should try to parallel my current PV1 and PV2 into just PV1 for a few days and see how it performs. However, I think it will really lower the overall output by a lot based on the PV1 and PV2 current graphs below. There really is really very little time when they all would get sun.

This post was modified 1 week ago 2 times by cimedaca

Joel Brodeur

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January 23, 2025 3:31 pm

Reply to

cimedaca

@cimedaca I am not sure what happens to the output when you parallel the two strings. In series a shaded panel or panels will definitely affect the efficiency of the entire sting. Not certain if the same is true when you parallel strings.

As @dfwtinker said, I would double check the overall string sizing before testing though. I am thinking you might be over current if you parallelled them.

Sometimes the easiest solution is the best solution.
Sometimes not.

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dfwtinker

January 23, 2025 3:51 pm

(@dfwtinker)

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@cimedaca I am going to agree that you are probably going to be in an over-current situation. That then in my mind leaves only a combiner box as the most viable option for combining those two strings. Someone with a lot more experience needs to weigh in on this. I certainly would use the sizing tool before "testing"

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dfwtinker

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January 23, 2025 8:18 pm

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dfwtinker

Here is a screenshot of the output from the sizer using my system.

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Joel Brodeur

January 23, 2025 4:03 pm

(@joel-brodeur)

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Briefly looking at the string sizzing tool and making a few assumptions about your system and not knowing what your yard layout is like here is what I might suggest.

You currently have:

String 1 - 7 Panels

String 2 - 7 panels

String 3 (potential) - 7 panels

It sounds like the best light you are going to get is with string 3

If you can, you might look at doing:

String 3 - increase to 11 panels

String 1 - increase to 10 panels

String 2 - eliminate and use those panels in 1 and 3

Again, I don't know your real estate so this may not be possible.

Also, you would really need to run the numbers through a string sizing tool as you know your specific conditions.

Sometimes the easiest solution is the best solution.
Sometimes not.

Question Crazy to add an EG4 MPPT100-48HV charge controller to my EG4 wall mount battery/6000XP combination?

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