Can controller be installed in battery compartment (somewhat limited in space). RV application, 2-6volt batteries, 1-100 watt panel.

Yes, as long as installation is not too close to batteries and the area is vented to avoid potential gassing / corrosion issues. And to allow for proper temperature sensing if the unit has only a built in sensor the controller should be is the same area as the batteries.

Does this unit alternate voltage based on battery temperature?

The charger will compensate for temperature based on it's internal sensor, essentially gauging the local environment's temperature. An option Smart Battery Sense can be attached to the battery for true battery temperature. Those are new and in short supply, but should be fully available by the end of June, 2018.

what is the difference between smart solar and blue solar?

The single difference between them is that the SmartSolar MPPTs have Bluetooth built-in so that you can monitor and configure them through the VictronConnect smartphone app. The BlueSolar MPPTs do *not* have the Bluetooth built-in; you can use a VE.Direct to Bluetooth Dongle to achieve the same functionality, but the cost of a SmartSolar ends up a little less (typically) than a BlueSolar MPPT +a VE.Direct to Bluetooth Dongle, so it usually makes more sense to order the SmartSolar. If you're not planning on monitoring the MPPT or changing any of the settings, however, a BlueSolar will be just fine, as the actual circuitry is virtually identical. Regards, -Justin Mobile Power Pros / Bay Marine Supply

Will this charger charge uphill? Meaning if I have a48v battery, do I need 52v from the solar panel just to start the charger?

No, this charge controller will not charge 'uphill'. You would need enough panels in series to have more than 48V. If you absolutely need to charge 'uphill', look at Genasun.

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BLUETOOTH CONNECTIVITY - Real-time monitoring and control from your smartphone
MAXIMIZE SOLAR HARVEST - Advanced MPPT tech squeezes every watt from your panels
ROBUST COMPACT DESIGN - Lightweight 580g unit built to withstand up to 60°C operating temps
ADAPTIVE MULTI STAGE CHARGING - Smart algorithm charges batteries faster and safer
CUSTOMIZABLE BATTERY PROFILES - Tailor settings for any battery type with presets or full customization

The Victron Energy SmartSolar MPPT 75V 15A charge controller is a cutting-edge solar battery charger designed for 12V and 24V systems. Featuring advanced MPPT technology and adaptive multi-stage charging, it maximizes energy harvest and accelerates battery recharge—even from zero volts. Bluetooth connectivity enables seamless remote monitoring and customization, making it an essential upgrade for efficient, smart solar energy management.

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Item weight	0.58 Kilograms
Display type	LED or minimal display
Operating temperature	60 Degrees Celsius
EU Spare Part Availability Duration	1 Years
UPC	703774384979
Manufacturer	Victron Energy
Product Dimensions	21 x 15 x 5 cm; 580 g
Batteries	1 Lithium Ion batteries required.
Item model number	MPPT 75\|15
Manufacturer Part Number	SCC075015060R
Wattage	440 watts
Item Weight	580 g

Victron Energy SmartSolar MPPT 75V 15 amp 12/24-Volt Solar Charge Controller (Bluetooth)

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