Victron MPPT 100/30 vs 100/50: Which One Do You Need?

The Victron MPPT 100/30 vs 100/50 choice comes down to one number: how many amps of solar charging you need. Both are SmartSolar controllers with the same 100V input limit, the same case and the same weight. Victron’s datasheet shows where they differ.

A 100/30 vs 100/50 comparison.

Victron MPPT 100/30 vs 100/50 Specs

Spec	SmartSolar 100/30	SmartSolar 100/50
Battery voltage	12/24V auto	12/24V auto
Rated charge current	30A	50A
Nominal PV power, 12V	440W	700W
Nominal PV power, 24V	880W	1,400W
Max PV open-circuit voltage	100V	100V
Max PV short-circuit current	35A	60A
Peak efficiency	98%	98%
Self-consumption	30mA (12V) / 20mA (24V)	Same
Terminals	16mm² / AWG6	Same
Weight	1.3kg	1.3kg

Source: Victron SmartSolar MPPT 100/30 & 100/50 datasheet.

What’s the Same

Both have Bluetooth and VictronConnect, VE.Direct for a GX device, a load output, no cooling fan and 46 days of stored history. Both need the PV voltage to be 5V above the battery to start charging, and both are damaged if open-circuit voltage goes over 100V.

Pick the 100/30 If…

You have up to about 440W of panels on a 12V bank, or 880W on 24V.
Your batteries are small. 30A is plenty for a 100Ah lithium battery.
You might add a second controller later for a different roof section. Victron’s VE.Smart Networking can synchronise two SmartSolars on one battery.

Pick the 100/50 If…

You have 450–700W of panels on 12V, or up to 1,400W on 24V.
You have a 200Ah-plus lithium bank and want to refill it in one sunny day.
You use parallel strings with high current. The 100/50 accepts 60A of short-circuit current, versus 35A for the 100/30.

Oversizing

Victron’s MPPTs limit their own output, so you can connect more panel watts than the nominal figure. The extra only helps in weak light. The hard limits are 100V open-circuit voltage, including cold-weather rise, and the short-circuit current figure.

Quick Example (Estimate)

Four 100W panels on a 12V bank: 400W ÷ about 13.5V ≈ 30A at full sun, right at the 100/30’s limit. Six panels (600W) need the 100/50.

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Victron’s SmartSolar 100/30 & 100/50 page has the datasheet and manual, or you can check the SmartSolar 100/30 on Amazon.

Worked Example: Harvest per Sunny Day

Assume 5 peak sun hours and about 25% real-world losses:

Array	Battery	Controller	Daily harvest (estimate)
300W	12V	100/30	≈ 1,125Wh
400W	12V	100/30	≈ 1,500Wh (just under the 440W nominal)
600W	12V	100/50	≈ 2,250Wh
700W	12V	100/50	≈ 2,625Wh
800W	24V	100/30	≈ 3,000Wh
1,200W	24V	100/50	≈ 4,500Wh

Estimates: watts × 5h × 0.75. Notice how the 100/30 on a 24V battery handles twice the panels it can on 12V, since the same 30A carries double the power.

Worked Example: Refilling a Lithium Battery

A 12V 200Ah lithium battery at 30% needs about 140Ah:

100/30 at full 30A: about 4.7 hours of strong sun (estimate).
100/50 at full 50A: about 2.8 hours (estimate).

In winter, with fewer strong hours, the 100/50 is more likely to fill the battery in a single day, provided you have the panels to feed it.

Worked Example: Two 100/30s Instead of One 100/50

A van with two roof sections, one often shaded by an air conditioner, can use a 100/30 on each section. Each tracks its own panels, so shade on one doesn’t affect the other. Together they can deliver up to 60A, and VE.Smart Networking keeps their charging in sync. The trade-off is a second controller to buy and wire.

Cold-Weather Voltage Check

Both controllers share the 100V limit, so string layout matters more than the controller choice. Two typical 100W panels with about 22V Voc in series give 44V, leaving plenty of room even on a freezing morning. Four in series reach about 88V at 25°C and can exceed 100V in the cold, so use a 2S2P layout instead. Victron’s MPPT calculator checks this with your panel model and location.

Self-Consumption and Night Draw

At 30mA on 12V, either controller uses under 1Ah a day at night, which is negligible for most systems and the same for both models.

Choosing Cable and Fuses

Both share 16mm² (AWG6) terminals. Size the battery cable and fuse for the controller’s rated current: about 40A for the 100/30 and about 60A for the 100/50 are common choices with suitable cable, following Victron’s manual. Keep the battery cable short to limit voltage drop.

Using the Load Output

Both models have a load output for small DC loads such as lights or a fan. It can switch off at a low battery voltage you set, and it can be set to an evening lighting timer. Larger loads should connect directly to the battery through a fuse or a BatteryProtect.

Setting Up Either One

Connect the battery first and wait for 12V or 24V detection.
Connect the panels through a PV disconnect.
Pair with VictronConnect and change the PIN.
Pick the battery preset or enter custom voltages.
Set the load output mode if you use it.

FAQ

Is the 100/50 much bigger?

No. They share the same case and weight.

Can a 100/30 charge 48V?

No. Both are 12/24V only.

Is BlueSolar the same?

BlueSolar versions lack built-in Bluetooth but have the same power ratings.

Will a 100/30 be damaged by too many panels?

Not by extra watts, since it limits its own output. Stay under 100V open-circuit voltage and the 35A short-circuit current limit.

Can I upgrade from a 100/30 to a 100/50 later?

Yes. They use the same case and terminals, so the swap is simple; check the battery cable and fuse suit 50A.

Do both work with a Cerbo GX?

Yes. Both have a VE.Direct port for a GX device and VRM monitoring.

Which is better for a 24V system?

On 24V, the 100/30 already handles about 880W, so many 24V vans and boats find it’s enough.

Sources: Victron SmartSolar MPPT 100/30 & 100/50 datasheet; MPPT solar charger manual; VE.Smart Networking manual (victronenergy.com, accessed Oct 2026).