RockBase IoT

NM-Solar 4.2V/3A Solar Energy-Storage & UPS Power Board for Low-Power IoT

$23.90 USD

~~$29.90 USD~~ $23.90 USD

$1.00 each

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Taxes included.

Suit NM-Solar + 2 x 5V module + 1 x 12V module NM-Solar mainboard 5V/3.3V sub-module 12V sub-module NM-Solar + 3 x 5V module NM-Solar + 1 x 5V module + 2 x 12V module

Overview

The NM-Solar series is a solar energy-storage UPS power-supply board for low-power IoT devices.

Model NM-Solar-4.2V/3A accepts USB-C, DC adapter, or 6 V / 18 V solar-panel input with selectable MPPT, charges a 1S lithium-ion battery pack (up to 4.2 V / 3 A), and provides three plug-in output slots (PACK direct / 5 V·3.3 V / 12 V). Main-board standby current is as low as 30 µA.

Built for LoRa, Zigbee, Meshtastic / MeshCore nodes, remote sensor terminals, agricultural monitoring, GNSS fixed stations, and short-term UPS backup for home or small security equipment.

Why NM-Solar

Three inputs in one: USB-C 5V, DC adapter (9-12V), 6V or 18V solar panel
☀️ True MPPT solar input — selectable 6 V or 18 V MPPT operating voltage, supports 10–50 W panels
🔋 1–4 parallel 18650 cells — automatic pack balancing, full reverse-polarity / over-charge / over-current / over-voltage / short-circuit protection
🔌 Three plug-in output slots — mix & match 5 V/3.3 V, 12 V, and direct PACK output modules (up to 12 A) as your project needs
🔁 Automatic input priority — solar/DC takes priority over USB-C seamlessly
🌙 Ultra-low power design — 30 µA main-board standby; output modules feature undervoltage shutdown & auto-recovery, validated through 1,200 low-light undervoltage tests
🔆 At-a-glance status — four-level battery capacity LEDs plus CHG / FULL charge indicators
🛡️ UPS functionality — keeps your node running through nights and cloudy days

General Specifications

Item	Specification
Model	NM-Solar-4.2V/3A
USB-C input	4.5-5.5V; 13W max input power
Input voltage range	5-25V
Solar input	6V or 18V solar panel
DC input	9V-12V adapter recommended
Recommended solar panel	10-50W
MPPT selection	6V / 18V selectable
Battery	1S 3.7V lithium-ion; 1-4 18650 cells in parallel
Charge limit	4.2V, 3A maximum
Standby current	30μA
Output slots	Three plug-in slots: support 5V/3.3V sub-board and 12V sub-board
5.5V / 3.3V sub-module	5V/1A and 3.3V/1A
12V sub-module	12V / 1A
PACK output	Battery-pack direct output, up to 12A
Combined output limit	30W maximum when multiple outputs are used simultaneously
Board dimensions	117 * 84 mm

TIPS: Charging current depends on the panel and light level. Reference values: a 35 W panel provides approximately 3 A at 150,000 lux and 2.5 A at 130,000 lux; a 20 W panel provides approximately 2 A at 150,000 lux and 1.5 A at 130,000 lux.

What's in the Box

NM-Solar-4.2V/3A main board × 1
Optional output modules: 5 V/3.3 V module and/or 12 V module (select by user)
18650 battery holder (max 4 cells)
Quick-start guide

Batteries and solar panel not included.

Get Running in Minutes

Install 1–4 matched 18650 cells, observing polarity markings. Note: when inserting batteries, pay attention to the marked battery polarity (red BAT+, black BAT-).
Select input mode: USB / DC / Solar MPPT 6 V or 18 V
Connect one power source to the Solar/DC path
Power off, plug in the output module matching your load
Connect your node — and deploy