My solar setup for my AC300 & 2*B300s

I’ve had my AC300 & 2*B300 batteries for around 8 months, and the solar panels I purchased for around 7 months, but I finally completed the solar array installation.

For the panels I purchase twelve used 250 watt panels from Santan Solar. The panels’ data is as follows: Voc is 37.6V, Vmp is 30.3V, Isc is 8.85A, and Imp is 8.27A. I have 3 panels in series and then parallel that with another 3 panels in series, for each of the 2 solar arrays. This gives me a theoretical 1500 watts for each MPPT controller, and 3000 watts total. Each array can give a maximum output of 91 volts and 16.5 amps, which will be regulated to around 1200 watts by the MPPT controller’s current limiting. I would have a theoretical maximum solar of 2400 watts into the AC300 with this setup. I’ve only had this in place for a week so I don’t yet have a lot of data yet, but even on these humid and hazy days I’m regularly seeing around 2000 watts coming in. My system has typically around 50% battery available at 7:30AM, and is full by 11:30AM.

My son and I worked out a mounting system design (he is a welder) that would be used for each array (so we had to build 2 mounts), and would allow the panels to be tilted monthly for the best solar exposure. The pictures below show some of the details of what we built.

Here are my AC300 and batteries.

Here are the posts, with part of the upper tilting mount attached, after they were dug in and concreted in place.

Here is a picture of how we tilt the panels using trailer jacks re-purposed for this job. On the far side of the post you can see the arched bracket. On that bracket the small holes are drilled for each months’ angle, and the bolt is used to lock the angle in place. The large hinge-bolts are also tightened to maintain the tilt position.

Here is a picture of the back of the completed array mounting systems. Here you can also see the flexible conduit and boxes I used to bring the power cabling into the house.

And here is a picture of the arrays showing the front side of the panels.

Here is a couple of screen captures from the Bluetti app showing solar input, taken on different days.


Man, that is one heck of a cool installation! Do you have pointing tables figured out for the cells? Like, figure out what angle is best for average exposure with an angle indicator for them, so you can set them next year based off of what you learned for the period this year?

That’s some solid work on those mounts!

I used one of the online calculators to determine the best monthly angle for my location. For me the table looks like the following.

Jan: 35°
Feb: 43°
Mar: 51°
Apr: 59°
May: 67°
Jun: 74°
Jul: 67°
Aug: 59°
Sep: 51°
Oct: 43°
Nov: 35°
Dec: 28°

• - 0° is vertical, 90° is horizontal

Since a number of the months repeat there are actually only 7 different angles needed. These angles are also stamped into the arched bracket for reference.

This is the calculator site I used Solar Angle Calculator | Solar Panel Angle Calculator


Dang, that’s a good setup! It’ll be really interesting to see how it performs. :smiley:

Yes, I’m rather excited to see myself. I still have to change what circuits my AC300 can supply via my transfer switch. I expect to use this to reduce my electric bill, as well as for power failures.

Awesome setup and thanks for sharing the details!

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I’ve been considering the exact same used panels for my setup. Thanks for sharing how well it works for you! Now if I only had a welder in my family…

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This looks so good. If the interface of Bluetti app have the solar angle tips for everyone that would be great. Wonder the company try to add some function that come with weather forecast to inform the user to adjust the solar panel.

Very impressive set up. Thank-You for sharing esp with the pictures!

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Very impressive setup. This is exactly what my next phase of home power capability that I’m looking to achieve and your setup is inspiring to say the least. Are you within city limits? Did you have to deal with an HOA? I know both of those issues might keep me from pursuing your solution, but maybe not. Well done!

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Fortunately for me it’s a “no” to both situations. I live in a rural area so it was no problem for me. I hope you don’t run into any insurmountable issues with installing solar panels at your home.

Thanks for your feedback. Yes, I really hope I don’t have issues with the city or HOA.

Great job. Thanks for sharing your work.

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Just wanted to do a quick update. Today is a decent clear day, so it represents a good winter solar charging day. The system got down to 55% before charging really kicked in. This picture shows solar charging just a little while before getting to 100% full. It is still too early in the morning to get full charging from the solar panels as peak solar would be around 1:00 PM locally.