The Mastervolt SCM20 is a PWM solar charge controller for simple, reliable solar charging of lead-acid battery banks. It supports 36-cell panels on 12V systems and 72-cell panels on 24V systems, with a display, switchable output, and an optional temperature sensor.
Who it’s for
- Small solar setups keeping lead-acid batteries topped up on a mooring or at anchor
- 36-cell panels on 12V or 72-cell panels on 24V
- Owners who want a straightforward controller without MPPT cost
Key features
- PWM solar regulation
- 36-cell panels on 12V, 72-cell panels on 24V (per supplied product data)
- For lead-acid battery types
- Display and switchable output
- Optional temperature sensor support
MPPT vs. PWM
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PWM is simpler and cheaper, and works best when panel voltage closely matches the battery, as with 36-cell panels on 12V.
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MPPT harvests more energy from higher-voltage panels and in cold or low light. See the Mastervolt SCM25 MPPT if you need it.
Related: battery and power
Before ordering
Confirm panel open-circuit voltage and current, array wattage, battery voltage and chemistry (lead-acid), controller current rating, cable sizing, and fusing.
What you're getting
Brand: Mastervolt
Part Number: 131822000
Fulfillment: Ships from a U.S. marine distribution warehouse
Warranty: Manufacturer warranty terms vary by brand and product
Shipping & returns
Shipping options and charges are shown at checkout. Orders normally ship from a U.S. distribution warehouse. Manufacturer warranty eligibility and claim procedures vary by brand; review the manufacturer’s current terms before ordering. Questions can be sent to support@sonarkmarine.com.
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