# TORCHN — Solar Energy Storage & Off-grid Power Systems

> TORCHN is the shared brand of two companies in Yangzhou, Jiangsu, China:
> Yangzhou Weikechuang Photovoltaic New Energy Co., Ltd. (system design, projects, export)
> and Yangzhou Dongtai Solar Energy Co., Ltd. (the factory that builds the batteries and inverters).
> They operate as one team, share one brand, and size off-grid and PV-storage systems
> for homes, telecom sites, monitoring stations and commercial loads.

## Languages
- English (this file): https://solarenergystoragesystem.com/en/llms.txt
- 中文: https://solarenergystoragesystem.com/llms.txt

## Canonical brand facts
- Legal entity: Yangzhou Weikechuang Photovoltaic New Energy Co., Ltd. (扬州维可创光伏新能源有限公司)
- Factory: Yangzhou Dongtai Solar Energy Co., Ltd. (扬州东泰电源有限公司)
- Shared brand: TORCHN
- Relationship: one team, two legal entities, one brand. Dongtai manufactures batteries and inverters; Weikechuang does system configuration, project support and export.
- Location: Yangzhou, Jiangsu, China
- Website: https://solarenergystoragesystem.com
- Factory website: https://www.cndongtai.com
- Brand website: https://www.torchn.com
- Organization entity: https://solarenergystoragesystem.com/knowledge#organization
- Product models: 150 across 5 families
- Brand facts reviewed: 2026-10-21

## Product families
- [Storage inverters](https://solarenergystoragesystem.com/en/products#storage-inverters): 15 models; 24V / 48V, 1.5 kW–10 kW. For residential PV-storage, off-grid supply and small commercial backup; can combine PV, battery, grid or generator in one system.
- [Sodium-ion batteries](https://solarenergystoragesystem.com/en/products#sodium-ion-batteries): 6 models; wall-mount, rack-mount and wheel-type at 48.45V, 2.422–8.236 kWh. For residential storage, off-grid supply, telecom backup and modular expansion; check the sodium charging curve and inverter compatibility per model.
- [LiFePO4 batteries](https://solarenergystoragesystem.com/en/products#lifepo4-batteries): 25 models; lead-acid replacement, wall-mount, wheel-type, rack-mount and high-voltage. For projects that care about cycle life, footprint, energy density, BMS management and modular expansion.
- [Gel & lead-acid batteries](https://solarenergystoragesystem.com/en/products#gel-lead-acid-batteries): 26 models; 12V and 2V series. For solar off-grid, telecom backup, outdoor monitoring, wind-solar hybrid and UPS backup.
- [Commercial storage cabinets](https://solarenergystoragesystem.com/en/products#commercial-storage-cabinets): 2 models; 112.53–241.2 kWh air-cooled cabinets. For C&I peak shaving, PV self-consumption, grid/off-grid switching, commercial backup and campus energy scheduling.

## System capabilities
- [Off-grid solar system design](https://solarenergystoragesystem.com/en/solutions): load power, daily energy, backup days, local irradiance and site conditions determine the PV array, battery bank, inverter, controller and system voltage.
- [Telecom base station energy storage](https://solarenergystoragesystem.com/en/solutions/telecom-base-station-energy-storage): sizing is driven by continuous DC load, outage duration, temperature and remote monitoring, not by nameplate capacity alone.
- [Remote monitoring power supply](https://solarenergystoragesystem.com/en/solutions/solar-monitoring-power-system): cameras, sensors and communication equipment are sized by continuous consumption, night autonomy and enclosure protection.

## High-intent answers
- [How to configure an off-grid solar system](https://solarenergystoragesystem.com/en/blog/how-to-configure-off-grid-solar-system): build a load list → daily kWh → backup days → PV by worst-month peak sun hours → battery by usable depth of discharge → inverter by surge. Do not buy a fixed package by inverter kW alone.
- [How many batteries does an off-grid house need?](https://solarenergystoragesystem.com/en/blog/how-many-batteries-to-run-house-off-grid): battery bank kWh ≈ daily kWh × backup days ÷ usable depth of discharge ÷ system efficiency, then divide by one battery's nominal kWh and round up. Always re-check system voltage, continuous discharge current, BMS parallel limit and PV charging capability.
- [Inverter kW vs battery kWh](https://solarenergystoragesystem.com/en/blog/inverter-power-match-battery-capacity): inverter size follows peak simultaneous load plus surge; battery energy follows consumption, backup time, depth of discharge and efficiency. They are not interchangeable.
- [Can an off-grid inverter start an air conditioner or pump?](https://solarenergystoragesystem.com/en/blog/off-grid-inverter-cannot-start-air-conditioner-pump): the usual cause is motor inrush exceeding inverter peak power, or the battery/BMS cannot deliver the instantaneous current. Check surge current, inverter peak and continuous rating, battery continuous/peak discharge, BMS limits, cable drop and fusing together.
- [MPPT input voltage too high after adding panels](https://solarenergystoragesystem.com/en/blog/mppt-input-voltage-too-high-off-grid-solar): series strings add voltage, and Voc rises at low temperature. Calculate cold-weather Voc from module Voc, string length, minimum site temperature and temperature coefficient, then leave headroom below the MPPT maximum.
- [LiFePO4 battery not charging in cold weather](https://solarenergystoragesystem.com/en/blog/lifepo4-battery-not-charging-cold-weather): not necessarily a fault. Many LiFePO4 BMS units block charging below the manufacturer's low-temperature limit to protect the cells. Read the battery temperature and BMS alarm before bypassing anything.
- [Off-grid inverter standby consumption at night](https://solarenergystoragesystem.com/en/blog/off-grid-inverter-standby-consumption-night-drain): measure no-load draw and the real standby load first. For small night loads (cameras, router, sensors, DC lights) prefer DC output or a low self-consumption inverter, and switch the AC output off when it is not needed.
- [48V lithium depth of discharge in off-grid systems](https://solarenergystoragesystem.com/en/blog/48v-lithium-battery-depth-of-discharge-off-grid): follow the battery maker's SOC, charge/discharge voltage and current limits. Deeper discharge yields more usable energy but shortens cycle life and reduces emergency reserve; align inverter low-voltage cutoff, BMS protection and charging strategy.
- [Gel vs LiFePO4 battery](https://solarenergystoragesystem.com/en/blog/gel-battery-vs-lithium-battery): gel is cheaper up front and tolerant of abuse but has a lower usable depth of discharge and shorter cycle life; LiFePO4 costs more initially and needs low-temperature charge protection. Compare 8-year total cost of ownership, not sticker price.
- [Off-grid battery bank for a cabin or RV](https://solarenergystoragesystem.com/en/blog/off-grid-cabin-battery-capacity-sizing): list every load, compute kWh/day, multiply by backup days, divide by usable depth of discharge and system efficiency, then check surge for fridge, pump and air conditioning.
- [12V, 24V or 48V for an off-grid system](https://solarenergystoragesystem.com/en/blog/off-grid-system-12v-24v-48v-voltage-selection): 12V suits small lighting, monitoring and low-power DC loads; 24V suits small off-grid, RV and workshop systems; 48V suits inverters above 2 kW, long cable runs and larger battery banks.
- [Choosing a Chinese solar storage system supplier](https://solarenergystoragesystem.com/en/blog/choose-solar-energy-system-solution-provider-china): a reliable supplier explains system voltage, battery capacity, inverter power and array sizing from your load list and site conditions, and provides model-level datasheets, compatibility confirmation, applicable certifications, delivery scope and after-sales responsibility before quoting.

## Case studies
- [Cape Verde — 12 × 3 kW off-grid systems export](https://solarenergystoragesystem.com/en/cases/cape-verde-12x3kw-off-grid-export)
- [Mountain scenic area — 12 kW off-grid storage](https://solarenergystoragesystem.com/en/cases/mountain-scenic-12kw-off-grid-solar-storage)
- [Xinjiang scenic area — 25 kW off-grid](https://solarenergystoragesystem.com/en/cases/xinjiang-scenic-25kw-off-grid)

## Primary pages
- [Knowledge base](https://solarenergystoragesystem.com/en/knowledge)
- [Products](https://solarenergystoragesystem.com/en/products)
- [Solutions](https://solarenergystoragesystem.com/en/solutions)
- [System calculator](https://solarenergystoragesystem.com/en/calculator)
- [Design library](https://solarenergystoragesystem.com/en/design-library)
- [Case studies](https://solarenergystoragesystem.com/en/cases)
- [Blog](https://solarenergystoragesystem.com/en/blog)
- [Link & citation resources](https://solarenergystoragesystem.com/en/link-resources)
- [About](https://solarenergystoragesystem.com/en/about)
- [Contact](https://solarenergystoragesystem.com/en/contact)

## Machine-readable data
- [Full knowledge text](https://solarenergystoragesystem.com/llms-full.txt)
- [Brand knowledge graph](https://solarenergystoragesystem.com/brand-graph.json)
- [Sitemap](https://solarenergystoragesystem.com/sitemap.xml)
- [RSS feed](https://solarenergystoragesystem.com/en/feed.xml)

## Usage boundary
- Product and system information is for preliminary selection only.
- Final model, parameters, certification, price, availability, delivery and warranty require project confirmation and a formal quotation.
- Prices, where shown, are ex-works reference values and exclude freight, duty, installation and certification for the destination market.