# Can MPPT be mounted horizontally?

**URL:** <https://community.victronenergy.com/t/can-mppt-be-mounted-horizontally/16077>\
**Category:** DIY\
**Tags:** mppt\_controllers, rv\
**Created:** [20 December 2024 22:44 UTC](https://community.victronenergy.com/t/can-mppt-be-mounted-horizontally/16077 "2024-12-20T22:44:05Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![CaptainPalapa](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/captainpalapa/32/11642_2.png) [@CaptainPalapa](https://community.victronenergy.com/u/CaptainPalapa)\
**Post date:** [20 December 2024 22:44 UTC](https://community.victronenergy.com/t/can-mppt-be-mounted-horizontally/16077/1 "2024-12-20T22:44:05Z")

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RVer here. Current install was completed by original owner. (We’ve had this fifth wheel five years, though.)

I’m ready to add 2x Victron Energy BlueSolar MPPT 100V 30 amp 12/24-Volt Solar Charge Controller to the mix. ( I have two portable solar panels (different wattages, hence 2x MPPT controllers.) Unfortunately, without reworking everything already installed, in other words: moving everything around, I don’t quite have space. However, I can, above the electronics bay, add a mounting option across the top. I just need to know if it’s okay to install these controllers both flat and upside down. Picture above your head, facing down.

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**Author:** ![ejrossouw](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/ejrossouw/32/1610_2.png) [@ejrossouw](https://community.victronenergy.com/u/ejrossouw)\
**Post date:** [21 December 2024 10:28 UTC](https://community.victronenergy.com/t/can-mppt-be-mounted-horizontally/16077/2 "2024-12-21T10:28:54Z")

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In principle you can, but it is not ideal as ingress protection only applies if installed with the terminals facing down and the other aspects are heat dissipation / airflow which could be less than ideal. If the MPPTs get hot, they will derate and since all other hot air will also rise to the top of the bay, I personally would avoid it. It is obviously not a simple yes or no answer with many things to consider. Best practice would be not to.

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**Author:** ![CaptainPalapa](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/captainpalapa/32/11642_2.png) [@CaptainPalapa](https://community.victronenergy.com/u/CaptainPalapa)\
**Post date:** [21 December 2024 14:19 UTC](https://community.victronenergy.com/t/can-mppt-be-mounted-horizontally/16077/3 "2024-12-21T14:19:25Z")

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Okay. Thank you. Guess ill have to rearrange everything. Ugh.

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**Author:** ![Astrayan](https://avatars.discourse-cdn.com/v4/letter/a/f05b48/32.png) [@Astrayan](https://community.victronenergy.com/u/Astrayan)\
**Post date:** [22 December 2024 06:21 UTC](https://community.victronenergy.com/t/can-mppt-be-mounted-horizontally/16077/4 "2024-12-22T06:21:47Z")

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Your MPPTs are reasonably heavy at 30A. You havent mentioned system voltage, but I presume 12V. Your portable solar panels cant be over 200W, which is a charging current of 14A, which wont even warm a 100|30

All guesses, since you left out details.

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**Author:** ![CaptainPalapa](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/captainpalapa/32/11642_2.png) [@CaptainPalapa](https://community.victronenergy.com/u/CaptainPalapa)\
**Post date:** [22 December 2024 15:33 UTC](https://community.victronenergy.com/t/can-mppt-be-mounted-horizontally/16077/5 "2024-12-22T15:33:27Z")

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I have a 400 and a 350, hence why i got 2 more controllers. Yes 12v.