Use DC to DC boost converter to get 24v panel up to >120v MPPT input?

[kampto]

Got a 6000xp and using PV1 input with 4000w on my roof, PV2 input is not being used, min mppt input needs to be >120V. I have a single vertical snow shedding mounted panel on my shed left over from my previous 24v system currently doing nothing, Vmpp 37v, Voc 46.1v, Impp 8.8A. So im familiar with these DC to DC buck boost up converters, use them in small scale low voltage projects. Does one exist that can boost my 37V panel up to >120V to utilize it in the PV2 input for a little extra juice? I know the efficiency wont be that good, don't care, right now its doing nothing. Something like this but rated for my set-up.

https://www.amazon.com/Aideepen-Converter-Step-up-Supply-Module/dp/B01MSYVMAL/ref=sr_1_10?crid=2VMGPOWPVYYM3&dib=eyJ2IjoiMSJ9._myjGjylI6Yy2cN1M1ssq69UMxLdHhd9H1kshGXRf_5Ry6AHS0ZNz24k_eSoglz2pI7-SL7nPeSOW4IuHM2D2aYBVSCJS5hSaG49hDR-DbeYJsiBUb_E47YUpMFv2JjbdxSecbf5CHosHshfRjCvtXjjPHY8v7QEDgPjWbTO69tix8I1ushmuxQl6BhpN6u3X8MdyqyG3RS3b1qE8c-8ModAzkaLJOCMhpHel99yv_g.PVmehngotFI17x_pV_9eDayied5nO1afXIwXdWlqae8&dib_tag=se&keywords=150v+dc+boost+converter&qid=1732149991&sprefix=150v+dc+boost+convter%2Caps%2C338&sr=8-10

Wondering if someone has done something similar and found cheap DC converter. Or if this will even work at all given the current reduction.

 

[sunshine_eggo]

No. You have an MPPT trying to pull all it can from a source, that source will almost certainly drop out due to overload, then the MPPT will reset to 0 load and start over. It will be a continual cycle of on/off.

A separate boost MPPT directly connected to the battery would work.

Thread 'Boost MPPTs'

Dec 11, 2023

It comes up from time to time if there's a way to use lower voltage PV to charge higher voltage batteries:

Here are a few options:

https://www.amazon.com/SUNYIMA-Controller-Electric-Charging-Regulator/dp/B0B7WWY5S3

https://www.amazon.com/dp/B07Z9F6729/ref=sspa_dk_detail_2?psc=1&pd_rd_i=B07Z9F6729

https://www.amazon.com/dp/B0B4SL5C2X

Not an endorsement. Just some options.

• sunshine_eggo
• Replies: 31
• Forum: DIY Solar General Discussion

• 

 

[Andrewr05]

You'd be better off getting a small pwm controller for less than $20 and doing something else with the panel other than charge the 48v battery.

 

[740GLE]

Snag a second panel, run them in series and connect to a 100/20 Victron unit seems simple enough.

 

[kampto]

Yeah, already did similar things with my extra panels on 24v Bat powered sheds and Victrons. Working great.

 

[GregWA]

I'm gonna buy an EG4 3000EHV for a hand truck battery (Wattcycle 12V 100Ah, 4 each) build.

I only have a couple of Harbor Frt 100W panels (VOC ~18VDC), can I get a DC-DC booster (converter) to get the series output (~38V?) up to the 120V PV input min that the EG4 needs? I could pick up a couple more 100W panels next time they go on sale (can you tell how cheap I am! ) and get my starting series string up to ~75VDC. Appreciate any product suggestions or alternate systems to charge my batteries.

 

[Quattrohead]

I just ordered the Ecoworthy unit as it is purpose made for the job.