Six Battery Capacity Testers for Deep Cycle Batteries
Six instruments for checking deep cycle battery capacity, from true load testers to conductance testers and a hydrometer, with guidance on what each method can and cannot tell you.
Read Guide→Solar & Renewable Energy Tools
Solar testers, PV meters, battery monitors and more.
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Buying Guides
Best Shunt Battery Monitors: 4 Picks for RV, Marine and Off-Grid Systems
Four shunt based monitors compared on stated accuracy, voltage range, what they calculate beyond voltage and current, and how the data reaches you.
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Best Solar Current Meters: 9 Precision Picks for Accurate Output Measurement
Nine current instruments for PV work, sorted by what each listing states: shunt monitors, DC leakage clamps, flexible Rogowski coils and panel gauges.
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Best Solar Multimeters: 10 Reliable Picks for Professional PV Testing
Ten meters for photovoltaic work, split between multimeters rated for high DC voltage and MPPT panel testers that measure the module, not the circuit.
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Best Solar Clamp Meters: 7 Powerful Picks for Safer PV Testing
Nine instruments for measuring current on photovoltaic circuits, compared on stated CAT rating, DC voltage ceiling and current range.
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Best Solar Power Meters: 3 Reliable Picks for Accurate Energy Measurement
Eight ways to measure what a solar system produces: DC shunt watt meters, handheld module testers, AC plug-in energy monitors and controllers with logging.
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Best PV Testers: 7 Professional Picks for Fast Solar System Diagnostics
Seven photovoltaic test instruments, from IEC 62446-1 multifunction kits and 1500 V I-V curve tracers down to handheld MPPT module testers.
Read Guide→Best Solar Irradiance Meters: 8 Accurate Picks for Professional Solar Testing
Eight instruments that read sunlight in watts per square metre, from pocket meters with a stated accuracy figure to survey tools adding tilt and temperature.
Read Guide→Solar Testing Tools for Commercial Rooftops: 5 Picks for Different Jobs
Five solar tools for commercial rooftop work, sorted by the measurement each one is built to make.
Read Guide→Solar Testing Tools for O&M Technicians: 4 Picks for Field Work
Four solar O&M tools compared by what they measure, what they connect to, and where each one runs out of range.
Read Guide→PV Testing Kits for System Commissioning: 5 Picks
A comparison of five PV testing kits for commissioning, from a full IEC 62446-1 test set down to a single MC4 adapter lead.
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Tools for Solar Panel Hotspot Investigations: 5 Picks
A comparison of five tools for solar panel hotspot work, covering thermal imagers for spotting heat and I-V curve tracers for confirming electrical loss.
Read Guide→Product Reviews
Fluke Solar Tools Kit Review: Insulation Testing to 1000 V With MC4 Leads
A solar kit pairing the Fluke 1587 FC insulation multimeter with TLPV1 MC4 test leads, stating insulation testing up to 1000 V and Fluke Connect wireless data logging.
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Fluke 283FC/PV Kit Review: CAT III 1500 V With a Wireless 60 A Clamp and MC4 Leads
A solar test kit stating a CAT III 1500 V and CAT IV 1000 V rated multimeter, a wireless 60 A AC and DC current clamp, Staubli MC4 test leads and TL175-HV premium leads.
Read Review→Fluke IRR1 Review: Irradiance to 1400 W per Square Metre With Panel Temperature
A solar irradiance meter stating a high precision monocrystalline sensor reading instantaneous irradiance up to 1400 W per square metre, with a built-in temperature sensor or an external suction mount probe.
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ALLmeter Solar Panel Tester Review: Pmax, Voc and Isc Through MC4 Connectors
A handheld MPPT solar panel tester stating maximum power to 2000 W, open circuit voltage from 3 to 90 V, short circuit current from 0 to 40 A, MC4 connections and a 3.2 inch sunlight readable display.
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Seaward Solar Survey 200R Review: Irradiance Measurement for PV Surveys
A solar survey meter measuring irradiance to IEC 62446 with a built-in compass, inclinometer and two temperature channels, plus data logging on the 200R.
Read Review→Seaward PV:1525 Review: 1500V Solar PV Testing for Professionals
A PV string tester for 1500 V systems covering open-circuit voltage, short-circuit current and insulation resistance in the IEC 62446 sequence.
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Open-Circuit Voltage vs Operating Voltage in Solar Panels
Voc is the voltage with nothing connected; Vmp is the voltage where the panel delivers its power. Both matter, for different reasons.
Read Article→Why Solar Panel Output Changes During the Day
Sun angle, air mass, clouds and heat draw the familiar bell curve, and a few things bend it.
Read Article→Solar Irradiance vs Solar Panel Output
Output follows irradiance almost linearly, then temperature, soiling and wiring take their cut.
Read Article→What Is Solar Irradiance?
The power of sunlight arriving on a surface, in watts per square meter. The input side of every solar calculation.
Read Article→How to Measure Solar Panel Output
Voc, Isc, Pmax and irradiance: the four readings that prove a panel.
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