What's the maximum size panel I can use with this controller?

100 Watts. You need to add 20% headroom. A 100 (watts solar panel) divided by 12 (battery voltage) equals 8.33 multiplied by 1.20 (20%) equals 10 (solar charge controller amperage)

Do I need to run my load through the controller, or can it go directly to battery? What are the advantages of running through the controller?

I'm afraid several have misunderstood the question. Without a low-voltage disconnect, the load connections on the controller are provided merely for connection convenience. It should be the same as connecting your load directly to the battery. There is no low-voltage protection either way. Unless you purchase the unit that contains the LVD

Morningstar controllers are manufactured in a fully automated world-class ISO 9001 facility in Taiwan.

Will this work with my 160w panels on my motorhome

yes it will works, because the solar panel will produce about 10 A/h

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Morningstar SunSaver 15A MPPT Solar Charge Controller SS-MPPT-15L - Solar Panel Regulator, Supports 12/24V LA/Li Batteries. Load/Lighting Ctrl, HazLoc Rated, Low Noise, 5 Yr. WTY - Designed in the USA

Product ID: 9467609

Details

Brand
Morningstar
Color
white/black
Item Weight
1.32 Pounds
Material
Polycarbonate
Voltage
12 Volts

⚡15A MPPT precision charging

🔋Supports 12/24V LA/Li batteries

🛡️Advanced multi-layer electronic protections

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Description

🔆 Charge smarter, live freer — power your independence with SunSaver 15A MPPT!

PLUG PLAY SIMPLICITY - Factory presets plus customizable settings mean hassle-free installation and seamless integration into your system.
BUILT TO BRAVE THE ELEMENTS - HazLoc rated and low noise design ensure reliable, quiet operation even in extreme environments.
MAXIMIZE YOUR SOLAR HARVEST - 15A MPPT tech extracts up to 30% more energy than PWM controllers, powering your off-grid lifestyle efficiently.
TRUSTED AMERICAN INNOVATION - Backed by Morningstar’s 5-year warranty and US-based tech support, join thousands who rely on industry-leading durability.
BATTERY LONGEVITY GUARANTEED - Four-stage charging with temperature compensation extends battery life, keeping your investment safe and sound.

The Morningstar SunSaver 15A MPPT Solar Charge Controller is a compact, high-efficiency regulator designed for 12/24V lead-acid and lithium batteries. Featuring advanced MPPT technology, it maximizes solar energy harvest while extending battery life through intelligent four-stage charging and temperature compensation. Built with robust electronic protections and a user-friendly interface, it supports load and lighting control, is HazLoc rated for safety, and comes with a 5-year warranty. Designed in the USA, it’s the trusted choice for reliable off-grid solar power management.

Specifications

ASIN	B008H64TBU
Best Sellers Rank	#48,812 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #30 in Renewable Energy Controllers
Brand Name	Morningstar Corporation
Color	white/black
Customer Reviews	4.2 4.2 out of 5 stars (44)
Display Type	LED
EU Spare Part Availability Duration	5 Years
Included Components	CONTROLLER
Item Weight	1.32 Pounds
Manufacturer	Morningstar Corporation
Material Type	Polycarbonate (PC)
Model	SS15L-MPPT
Part Number	SS-MPPT-15L
UPC	704088479474 719826772724 026190333438
Unit Count	1.0 Count
Voltage	12 Volts
Warranty Description	5 years

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¥91888

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In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

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