Specs and shopping targets
| Option / factor | Key spec or role | Best fit |
|---|---|---|
| Charge current | 50A | 35A |
| Nominal PV @12V | 700W | 500W |
| Nominal PV @24V | 1400W | 1000W |
| 48V battery support | No | Yes |
| Max PV Voc | 100V | 150V |
| Peak efficiency | 98% | 98% |
Compare current listings for Victron SmartSolar 100/50 vs 150/35: More Amps or More PV Voltage?
Model revisions, bundles and inventory change quickly in RV power. Use the exact model name and electrical limits from this guide rather than buying from the thumbnail alone.
What matters in a real RV
Why higher PV voltage can be useful
Higher string voltage reduces current for the same power, which can reduce voltage drop and make long roof-to-controller runs easier to manage.
Why 50A can matter more on 12V
A large 12V battery bank can use the extra 15A of charge current. If the array already stays well below 100V, the 150V ceiling may add no practical value.
Cold weather is the voltage test
Panel Voc rises as temperature falls. Series-string design must be checked at the coldest plausible condition, not only at the 25°C label value.
48V systems eliminate the 100/50
Skoolies and larger mobile builds using a 48V bank need a controller that supports 48V. That architectural decision can settle the comparison immediately.
How to keep this component from becoming the bottleneck
RV power systems fail at interfaces. A solar controller can be correctly sized for panel watts and still be wrong because the series string exceeds its cold-weather open-circuit voltage. An inverter can have enough watts for the appliance and still fail because the battery BMS cannot deliver the DC current. A battery can store enough watt-hours for the night and still be unable to accept the available solar or alternator charge current. Treat every purchase as part of a chain.
Before ordering, write down five numbers: the battery-bank voltage, the largest continuous load, the largest motor/compressor start, the solar array’s combined Voc/Isc in its planned wiring configuration, and the battery’s maximum charge/discharge current. Those five numbers eliminate a surprising number of bad purchases.
Then measure the physical install. RV electrical components need cable bend radius, airflow, fuse/disconnect access and room for a future technician to put a meter on the terminals. Roof products need clearance from vents and air conditioners, a serviceable cable path and a realistic strategy for sealant, wind and removal. Portable gear needs a storage location that does not make daily deployment so annoying that you stop using it.
12V vs 24V: the decision hiding behind bigger systems
At low power, 12V is convenient because it matches the RV’s native lights, pumps and fans. At high power, current becomes the penalty. Two kilowatts from a 12V bank can mean roughly 170–190A after conversion loss; three kilowatts can push beyond 250A. Large solar arrays create the same issue on the charging side. Moving a clean-sheet system to 24V roughly halves current for the same power, which can reduce conductor size and voltage drop. The cost is that the RV’s 12V loads need a deliberate DC-DC supply strategy.
Heat, cold and real-world derating
Published ratings are not a guarantee that the component will deliver its headline number in a sealed compartment at midsummer roof temperatures. Inverters and controllers can thermally derate. Solar panels usually lose voltage and power as they get hot, while their open-circuit voltage rises in the cold. LiFePO4 batteries may refuse charging below a temperature threshold even when the solar array is producing. Leave margin instead of designing every component to operate permanently at its limit.
Shopping strategy
Use marketplace searches to compare the exact revision, bundle contents and warranty. Pay special attention to whether a Bluetooth module, temperature sensor, remote, cables, connectors, mounting hardware or transfer function is actually included. Manufacturers often sell several products under nearly identical names.
Frequently asked questions
Can a 150/35 handle more solar than a 100/50?
Not on a 12V battery by Victron’s nominal ratings; the 100/50 is rated for more PV wattage at 12V.
Can I put three 36V-Voc panels in series on a 100V controller?
Usually not safely, especially after cold-weather voltage rise. Calculate the worst-case string Voc first.
Does 150V mean the controller outputs 150V to the battery?
No. It accepts a higher PV input voltage and converts it to the battery’s charging voltage.
Primary specification sources
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