ROCKSOLAR 2 to 1 Solar Branch Connectors MMF+FFM Pair
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ROCKSOLAR 2 to 1 Solar Branch Connectors MMF+FFM Pair
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What it is, and what it is for
ROCKSOLAR 2-to-1 Solar Branch Connectors, MMF + FFM pair
A pair of MC4 Y-connectors that joins two solar panels in parallel into one positive and one negative lead. Sealed to IP67 with a UV-resistant housing, they live on the roof or the rack for the life of the array.
Panels wired in parallel keep the array at one panel's voltage and add the currents together, which is the right layout for a PWM controller, a 12 V or 24 V battery bank, or any MPPT whose open-circuit limit rules out a series string. Use one pair per array: the MMF side joins the positives and the FFM side the negatives, so the two output leads plug straight into the controller's PV input or an extension cable. Only parallel panels of the same voltage, and fuse each panel if more than two are combined; the output carries the sum of the panel currents, so size the downstream cable for that.
For three or four panels use the 3-to-1 or 4-to-1 pair. Wiring is for reference; on a permanent installation a licensed electrician should make the connections.
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Every number, by component.
The figures the manufacturer publishes. The datasheet above is the reference if the two ever differ.
| Configuration | 2 to 1: one MMF and one FFM connector |
|---|---|
| Connector standard | MC4-compatible, snap-lock |
| Rating | MC4 standard: 1,000 V DC, 30 A |
| Enclosure | IP67, UV- and ageing-resistant housing |
| Use | Parallel connection of panels with the same voltage |
| Warranty | 1 year |
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