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Old 10-19-2019, 06:49 PM   #1
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Thoughts on Where to Mount MPPT

We're considering 2 locations to mount our Victron 150/100 mppt SmartController, battery compartment in basement or cubby behind TV in bedroom.

Battery compartment pro is obviously short wire run to batteries so less voltage drop. Cons are exposure to elements (compartment open to road on bottom, AGM batteries) and tight squeeze for access.

Cubby behind TV is about 10' from the batteries, will be using 2 awg (regardless of controller location). Hubby has seen drop of .28v on a voltage drop table. Pro is protection from elements. Con is voltage drop.

Both are doable, cubby behind TV is less of a hassle.

Whatcha think?

Thank you.
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Old 10-19-2019, 06:56 PM   #2
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Keep it out of the battery compartment .Make sure you have enough air movement in the cubby to keep the controller cool.
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Old 10-19-2019, 09:20 PM   #3
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If the battery compartment stays dry, I would mount it there. Maybe obstruct splash or dirt. Always leave space for convection air flow over the rear fins.
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Old 10-19-2019, 10:07 PM   #4
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There is no adjacent compartment to the batteries where it can be mounted? Closer to the batteries is better.
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Old 10-20-2019, 11:42 AM   #5
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Controller placement

I faced the same choice. I put the solar controller inside the bedroom and ran longer 4ga wires to the batteries.

You mentioned using a Victron solar controller. Hopefully you will also be using a Victron BMV. My BMV-712 communicates with the solar controller. The BMV passes the battery voltage and temperature back to the solar controller so the solar controller can boost the voltage to compensate for the voltage loss and battery temperature.

Good luck
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Old 10-20-2019, 05:07 PM   #6
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There is no adjacent compartment to the batteries where it can be mounted? Closer to the batteries is better.
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Old 10-21-2019, 07:18 PM   #7
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Nope, one side is full/no room & the other is wheel well.
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Old 10-21-2019, 11:19 PM   #8
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Mounted our solar charge controller in the bedroom and relocated the new Lifeblue LiFePo4 batteries closer to the new Victron Multiplus inverter/charger. The shop that installed the system said there was too much voltage drop from the old battery compartment in the rear run bay.
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Old 10-23-2019, 06:46 PM   #9
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Mounted mine next to the inverter on the ceiling. 18" cables to the battery cables on the inverter. The solar prewires from the roof were in that bay too.
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Old 10-31-2019, 05:47 PM   #10
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Mounted mine in bay right behind battery bank. Up between frame rails... wastes no space...protected from elements...short distance from batteries...and since it is Victron SmartSolar...it is controlled via Bluetooth, so no need to physically touch it to setup or check output.
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Old 11-04-2019, 01:34 PM   #11
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I never considered the LED indicators on the Victron I installed at the top of the stars above the battery compartment! At night there is a long duration blink to a blue indicator. It is just in the corner of the wife's vision!
More things to consider than short cable runs!!!
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Old 11-04-2019, 09:03 PM   #12
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I find a little red electrical tape allows the LED to be seen but not shine into a dark room. I do this to all the LEDs in my bedroom at home.
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Old 11-05-2019, 06:16 PM   #13
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From experience, keep it inside. The .28 voltage drop is not significant enough. If it's the smart solar controller, you can access it from your phone for all measurements and settings.
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