Product Guides

Explore Techfine product guides covering solar inverters, MPPT charge controllers, LiFePO4 batteries, off-grid systems, and energy storage solutions.

Lithium ion solar storage battery being tested with a digital multimeter, load tester, and capacity test charts.

How to Test Lithium Ion Battery: A Step-by-Step Guide

Test a lithium-ion battery in 4 steps: voltage, capacity, load and self-discharge. Includes a 12V LiFePO4 voltage-to-SOC chart and warehouse intake checks.

# Lithium Battery

Last Updated: July 8, 2026
Solar system sizing workflow illustration showing load demand, energy estimate, battery reserve, PV array sizing, inverter selection, MPPT check, and final system balance.

How to Calculate Solar Panel, Battery, and Inverter Size

Size a solar system in 6 steps: load, battery kWh, inverter surge, PV watts, MPPT limits, and reserve capacity for weak-grid homes.

# Solar Battery, Solar Inverter, System Sizing

Last Updated: July 12, 2026
Generic inverter connection architecture showing a protected path from PV panels to a charge controller, battery bank, inverter, AC breaker, and essential loads, with grounding and commissioning checks.

How to Properly Set Up an Inverter Connection: An Installer Reference

An installer reference for inverter, panel, battery, and controller connections. Covers polarity, cable sizing, protection, and common wiring mistakes.

# Solar Inverter

Last Updated: July 12, 2026
Generic parallel solar inverter architecture diagram showing two inverters linked by communication, protected DC inputs, PV inputs, AC output bus, breakers, battery bank, grid, and load connections.

How to Connect Two Solar Inverters in Parallel

Connect 2 solar inverters in parallel only if the model supports it. Check voltage, firmware, cables, breakers, grounding, and load sharing.

# Installation, Solar Inverter

Last Updated: July 12, 2026
Solar inverter lifecycle concept showing installation, ventilation, loading, monitoring, maintenance, heat, dust, aging, inspection, and eventual replacement around a generic inverter.

How Long Does a Solar Inverter Last? Service Life, Failure Signs, and Maintenance

Solar inverters commonly need replacement before PV modules. Learn the 10–15-year planning range, failure signs, and maintenance checks for buyers.

# Solar Inverter

Last Updated: July 12, 2026
Solar charge controller maintenance concept showing PV, battery, and load connections with checks for terminals, polarity, cooling, temperature, battery settings, inspection timing, and fault records.

Solar Charge Controller Maintenance: A Service Checklist for Installers and Distributors

Use this solar charge controller maintenance checklist to inspect wiring, cooling, PV input, battery settings, and faults before they become returns.

# MPPT Solar Charge Controller

Last Updated: July 12, 2026
Standalone MPPT controller compared with inverter with built-in MPPT

MPPT Controller vs Inverter with Built-in MPPT: Which to Choose

A standalone MPPT controller only charges batteries; a hybrid inverter with built-in MPPT does that plus DC-AC conversion. When to buy one box vs two.

# MPPT Solar Charge Controller, Solar Inverter

Last Updated: July 8, 2026
Distributor lithium battery maintenance workflow showing climate-controlled rack storage, BMS inspection, terminal and enclosure checks, recordkeeping, quarantine, and protective return packaging.

Lithium Battery Maintenance for Distributors: Storage, Service, and Warranty

A lithium battery maintenance guide for distributors: SOC storage targets, temperature limits, BMS checks, and warranty inspection steps.

# Lithium Battery

Last Updated: July 12, 2026
Solar inverter after-sales maintenance concept showing safe isolation, fan and heat-sink cleaning, terminal inspection, moisture and temperature checks, monitoring, fault evidence, and controlled restart.

Solar Inverter Maintenance: A Distributor After-Sales Service Checklist

Use this inverter maintenance checklist to reduce warranty returns. Covers inspection intervals, vent cleaning, terminal torque, and fault logging.

# Solar Inverter

Last Updated: July 12, 2026
Educational map separating lithium battery chemistry, cell format, and finished solar-storage product format.

What Are the Different Types of Lithium Batteries?

Compare 5 lithium battery types: LFP, NMC, LCO, LMO, and LTO, plus cell formats and solar-storage product styles for buyers.

# Energy Storage Battery, Lithium Battery

Last Updated: July 9, 2026