Victron SmartSolar MPPT 150/35

The number before the slash in a Victron SmartSolar model tells you the maximum PV input voltage. The number after tells you the maximum charge current. The 150/35 accepts up to 150V of solar input and delivers up to 35A of charge current. That 150V input ceiling is the defining feature — it fundamentally changes how you can wire your solar array.

Why 150V Input Matters

Most budget MPPT controllers top out at 100V input. The Victron SmartSolar 100/50, for example, handles 100V maximum. This means you are limited to shorter series strings or must wire panels in parallel, which increases current and requires thicker, more expensive cables. With long distances between panels and battery bank — common in ground-mounted arrays or panels on an outbuilding — voltage drop becomes a real problem at high current.

The 150/35 solves this by allowing you to wire more panels in series, raising the string voltage and proportionally reducing current. A string of three 40V panels in series sends 120V at relatively low current through thin, inexpensive wire over runs of 50 feet or more with minimal voltage drop. The MPPT controller then steps this high-voltage, low-current input down to your battery voltage at higher current. The result is more of your solar energy reaching your batteries instead of being lost as heat in the wiring.

For a 12V battery system, the 35A charge output translates to roughly 500W of solar capacity. For a 24V system, that doubles to approximately 1,000W. For a 48V system, you can handle up to 2,000W — a substantial array managed by a single $220 controller.

The Victron Ecosystem

Built-in Bluetooth connects to the VictronConnect app for monitoring, configuration, and historical data. You can view daily yield, track charging stages, adjust battery charge profiles, and see real-time PV voltage and current. The data quality and app experience are meaningfully better than budget competitors.

The SmartSolar 150/35 integrates with the broader Victron ecosystem via VE.Direct. Connect it to a Victron GX device and you get remote monitoring through the Victron Remote Management portal, system-wide energy management, and integration with Victron inverters and battery monitors. This ecosystem connectivity is what separates Victron from nearly every competitor at any price point.

Battery compatibility covers flooded, AGM, gel, and LiFePO4 chemistries with user-adjustable charge algorithms. The LiFePO4 profile includes proper temperature compensation when paired with a Victron temperature sensor.

The Compromises

At 35A, the charge current is modest for larger systems. If you have a big battery bank and want to maximize charge speed, the 150/50 delivers 50A for about $100 more. The 35A rating is appropriate for small to medium systems — a 200Ah LiFePO4 bank charges at roughly 0.175C, which is well within safe limits.

The $220 price is not budget territory. An Epever Tracer 4210AN delivers 40A of MPPT charging for $100. The extra $120 buys you higher input voltage capacity, Bluetooth, VE.Direct integration, the Victron ecosystem, and a 5-year warranty. Whether that premium is justified depends on your system’s complexity and your need for monitoring.

Who Should Buy It

Buy the SmartSolar 150/35 if you have long wire runs between panels and batteries, want to series-wire panels for efficiency, or are building within the Victron ecosystem. The 150V input is the reason to choose this over cheaper alternatives.

Skip it if your panels sit within 10 feet of your battery bank and you are on a tight budget. The Epever Tracer 4210AN or Renogy Rover 40A provides adequate MPPT charging for less than half the price, with the trade-off of lower input voltage limits and no ecosystem integration.