YourWatts Hands-On Testing Methodology 2026: How We Evaluate African Solar Products

Why methodology transparency matters

African solar product evaluation faces structural credibility challenges:

• Manufacturer marketing influence — substantial advertising spending across African solar publications, ranging from explicit sponsored content to subtle editorial influence through preferred-relationship dynamics.
• Distributor incentive structures — distributors typically incentivise specific brand recommendations through margin structures that aren't always disclosed to readers.
• Installer relationship dynamics — installers often cross-reference review publications when recommending equipment, creating pressure for publications to maintain installer-favorable coverage.
• Limited independent technical capacity — most African solar publications operate with limited technical evaluation resources, defaulting to manufacturer specifications and surface-level analysis.
• Cross-border supply chain complexity — products often arrive through parallel-import channels with limited manufacturer accountability; review accuracy varies substantially.

YourWatts publishes this methodology document so readers can assess our editorial process against these structural pressures and identify whether our approach matches their evaluation needs. Transparency is the integrity mechanism — not perfection.

Product acquisition pathways

YourWatts acquires products through three pathways, each with disclosure obligations:

Independent retail purchase (dominant pathway)

Products purchased at typical retail pricing through standard distribution channels in target markets. Examples: Pylontech US3000C purchased through SA distributors, Sunsynk 5K purchased through Sunsynk-certified installer, Hubble AM-5 purchased through Pretoria-based distributors. This is the preferred acquisition pathway for typical mid-tier products with established African distribution. Costs are recovered through long-term reference value of in-depth reviews rather than evaluation-unit subsidies.

Installer partner loan

Short-duration deployment of evaluation units loaned by installer partners. Used for: premium products where independent purchase isn't economical (Freedom Won eTower 14, Victron MultiPlus II 48/5000 with full Cerbo GX + MPPT ecosystem), professional-grade equipment, larger systems where evaluation requires substantial capital commitment. Disclosure: installer partner relationship is documented in individual product reviews. Editorial independence is maintained — installer partners do not have editorial input.

Manufacturer-supplied evaluation units (limited)

Manufacturers supply evaluation units in select cases where: editorial coverage value justifies the disclosure, manufacturer relationship is transparent, product warrants coverage that independent purchase wouldn't enable. Disclosure: manufacturer-supplied unit status is documented in individual product reviews. Critical principle: multiple manufacturer-supplied products on this site have received critical or mixed reviews. Manufacturer supply does not influence evaluation outcomes — the disclosure is the integrity mechanism.

What we don't accept

• Sponsored review content — paid placement is not part of YourWatts editorial.
• Manufacturer review approval — manufacturers do not preview or approve reviews before publication.
• Editorial direction in exchange for access — access to manufacturer engineering teams or distributor channels does not buy editorial direction.
• Distributor-pushed specific product evaluations outside YourWatts editorial planning.

Measurement protocols by product category

Batteries

• Actual usable capacity measurement — measured against manufacturer-claimed usable capacity at specified DoD; reported deviation where significant.
• Cycle count over deployment period — counted via inverter monitoring or BMS reporting; correlated with capacity retention measurement.
• Capacity retention measurement — periodic discharge tests measure capacity vs initial; reported as percentage retention.
• BMS behavior under edge cases — observe BMS response to: deep discharge events, high-current discharge events, low-temperature charging attempts, communication failures, inverter restart scenarios.
• Thermal behavior in deployment ambient — battery surface temperature observation across deployment seasons; capacity behavior vs ambient temperature.
• Communication protocol behavior — verify CAN/RS485 integration with claimed inverter brands; document any handshaking issues.
• Installation handling observations — weight, mounting hardware, cable connections, BMS firmware update process.
• Warranty event documentation — when warranty events occur during evaluation, document distributor response time, replacement process, fulfillment quality.

Hybrid inverters

• Continuous AC output capability — measured under realistic sustained load against manufacturer-claimed continuous rating.
• Peak output behavior — surge load response observation (refrigerator compressor startup, pool pump motor startup).
• Efficiency measurement — DC-to-AC efficiency across operating range; PV-to-battery efficiency measurement.
• Grid handling observation — behavior across voltage variation (180-265 V range), frequency variation, brownout/blackout transitions.
• Battery management algorithm behavior — observe charge curve, discharge curve, SoC reporting accuracy vs battery BMS.
• Monitoring app reliability over months — uptime, data accuracy, latency, feature stability.
• Warranty fulfilment turnaround — when warranty issues arise, document response.
• Firmware update behavior — observe firmware update process, downtime, impact on operation.

Solar charge controllers

• MPPT efficiency measurement — actual energy capture vs theoretical maximum at varying irradiance.
• Voltage range handling — string voltage tracking across cold-morning and hot-afternoon extremes.
• Battery integration behavior — charge profile coordination with battery BMS via DVCC.
• Bluetooth/VE.Direct/VE.Can communication reliability.
• Monitoring app reliability.

System integration testing

• Multi-component coordination — Cerbo GX + MultiPlus II + MPPT + battery + generator integration behavior.
• Generator integration logic — start/stop trigger accuracy, fuel optimisation effectiveness.
• Performance against manufacturer-claimed specifications.
• Edge case behavior — unusual loads, weather extremes, grid abnormalities.

Test duration framework

Test duration matters because African deployment conditions vary substantially through seasons:

• Batteries: minimum 12 weeks for cycle behavior + initial capacity retention pattern; ideally 6-12+ months for capacity retention verification across seasonal ambient variation.
• Hybrid inverters: minimum 8 weeks for diurnal load patterns; longer for monitoring app reliability assessment over time.
• Solar charge controllers: minimum 8 weeks across varying irradiance conditions including cloud cover patterns.
• System integration: minimum 12 weeks for complete system behavior across operational scenarios.
• Multi-year observations: where deployment continues past initial review publication, longer-term observations are added to reviews with publication date stamps.

Published reviews indicate deployment duration at publication time. Reviews may be updated as longer-term observations emerge. The methodology emphasizes that solar products are multi-decade purchases — short-duration evaluations have meaningful blind spots that should be acknowledged in product recommendation framings.

Deployment context observation

Beyond product-specific measurements, YourWatts reviews integrate deployment context observation:

• Market-specific installation patterns — how products integrate with typical local installer ecosystems.
• Cross-border supply chain reality — actual product availability, supply chain delays, warranty fulfilment friction.
• Local regulatory framework integration — grid code compliance verification, net-metering registration process observation.
• Climate-specific performance — performance observation in actual African ambient conditions vs lab measurements.
• Cost-context analysis — total installed cost analysis including local labour, accessory components, regulatory costs.
• Cultural and language considerations — documentation availability, language support, installer training availability.

Editorial independence framework

Three core principles govern editorial independence:

Principle 1: Affiliate revenue does not influence editorial

YourWatts may earn affiliate commissions when readers purchase through certain links. However: editorial recommendations are made before affiliate relationships are established and are not changed based on affiliate arrangements. Multiple recommended products on this site do not have YourWatts affiliate relationships. Affiliate disclosures appear in articles where affiliate links are present. The editorial position is consistent regardless of affiliate status.

Principle 2: Manufacturer relationships do not buy positive coverage

Manufacturers cannot influence specific product evaluations through advertising spending, evaluation unit supply, or relationship building. Critical reviews of manufacturer-supplied products have been published on this site. Manufacturers do not preview reviews before publication. Negative findings about manufacturer products are not negotiated.

Principle 3: Reader interests come first

When manufacturer claims conflict with deployment observations, YourWatts publishes the deployment observations even when this displeases manufacturers or distributors. When manufacturer-favorable narratives conflict with consumer outcomes, the consumer-favorable analysis is published.

Methodology limitations

The YourWatts methodology has acknowledged limitations:

• Resource constraints — independent technical journalism has finite resources. Not every product can be independently purchased and tested across multiple market contexts.
• Test duration vs ideal — multi-decade products evaluated over months have inherent extrapolation uncertainty.
• Deployment context specificity — observations in one African market may not perfectly translate to all African markets. Reviews note deployment context.
• Manufacturer specification verification — efficiency measurements and similar require equipment that may not match laboratory-grade testing. Observations are approximate where precision matters.
• Cross-border distribution coverage — distribution observations may not perfectly capture all markets covered in country guides.
• Editorial perspective — single-author methodology produces consistency across products but may have systematic blind spots that broader editorial teams would catch.

The methodology document acknowledges these limits explicitly so readers can apply appropriate skepticism while still finding value in the reviews.