Solar · Storage · Off-grid systems
Store the sun.Run the day.
We build modular lithium storage and solar systems for homes, farms, fleets and infrastructure — engineered in Shenzhen, installed in more than 40 countries.
Factory direct · OEM / ODM · 10-year design life
2 GWh
Annual cell-to-system capacity
6,000+
Cycles at 80% depth of discharge
40+
Export markets served
20 yrs
In power electronics
01Who we are
A factory-first partner, not a catalogue.
Sansend May is the export arm of a Shenzhen solar and storage group. We work directly with cell and inverter factories in Shandong and Guangdong, then configure, test and ship systems that match a site’s real load — not a brochure’s ideal one.
- 01Cell-to-system traceability on every serial number
- 02Configurations sized against your load profile and tariff
- 03Spare-part stock and remote diagnostics for ten years
Ranch security · QLD
Marine array · IT
Mobile living · DE02What we make
Four lines. One engineering team.
Storage, solar, battery packs and portable power share a single BMS toolchain, commissioning checklist and warranty process. Mix them in one project without juggling four support desks.
Browse the catalogue01 / 2 platforms
Storage
Stackable and wall-mounted lithium systems, 5–25 kWh.
- All-in-One ESS5.12–25.6 kWh · stackable
- Wall-Mounted Battery5.2 / 10.5 / 16 kWh
02 / 5 platforms
Solar
Ultra-slim kits, flexible panels, lighting and remote power.
- Ultra-Slim Solar Kits800 W / 1.6 kW · 30 mm frame
- Lighting & Off-Grid Nodes6,000 lm · IP66 · 5-night autonomy
03 / 4 platforms
Battery
Grade-A LFP cells and traction packs for mobility.
- Cells & Traction Packs3.2 V 314 Ah · 60–72 V packs
04 / 1 platforms
Power
Portable stations and UPS-grade backup for field work.
- Portable Power500 W / 1 kWh · 1 kW / 2 kWh
03Where we work
Built for where the grid ends.
From a balcony in Lisbon to a monitoring buoy in the North Sea, the same engineering questions apply: how much energy, how often, and who services it in year eight.
All solutions
01Home & small business backup
Wall-mounted storage with a 10 ms transfer, sized for a fridge, lights, router and one pump.
02Solar lighting for facilities
Self-contained poles for car parks, logistics yards and access roads — no trenching, no grid connection.
03Remote monitoring & security
Camera and sensor nodes that keep recording through a week of cloud, on fences, farms and construction sites.
04RV, van & overland
12 V and 48 V systems for camper conversions, with flexible panels that follow a curved roof.
05Marine & offshore
Flexible arrays and sealed packs for buoys, uncrewed vessels and yacht decks — salt-tested, low-profile.
06Commercial & industrial
Peak shaving and demand-charge management for warehouses and light manufacturing, 30 kWh to 1 MWh.
Field note 04
Bonded array, 2.5 mm profile. No rails to catch rigging.
04How it is built
Safety is a mechanical decision before it is a software one.
Every enclosure is prototyped, drop-tested and thermal-cycled before a single firmware feature is written. Then the BMS is tuned against real load shapes, not lab curves.
Cell selection
Grade-A LFP cells, batch matched and Hi-pot tested. Cells outside a 20 mV window never reach assembly.
Thermal design
Airflow modelled before tooling. Cabinets hold ≤8 K cell delta at 1C continuous discharge in 45 °C ambient.
BMS & firmware
Two-level protection, 200 ms fault logging, CAN/RS485 to 30+ inverter protocols, OTA updates in the field.
Factory acceptance
Every unit runs a 4-hour charge/discharge cycle and an insulation test. Reports ship with the serial number.
05Field notes
Systems in the field
North Sea, Netherlands
Powering a buoy fleet through the grey season
24 monitoring buoys · 200 W arrays · 1.6 kWh packs
Poznań, Poland
A 180-pole retrofit that avoided 2.4 km of trenching
180 poles · 6,000 lm · 18 m spacing
Queensland, Australia
46 cameras, 11 km of fence, no grid
46 camera nodes · 100 W · 640 Wh
06Newsroom
Latest from the factory floor
Event02 Oct 2026
Canton Fair 2026: booth 12.2 J31
We are showing the SM-STACK 5.12 and the new balcony kit in Guangzhou from 15 October.
Read moreProduct08 Sept 2026
SM-STACK 5.12 goes into series production
Five modules, one base, 25.6 kWh — and a service corridor requirement of only 600 mm.
Read moreCompliance21 Jul 2026
IEC 62619 renewed for the SM-WALL range
All three capacities passed the nail penetration and overcharge tests at the same notified body.
Read more07Start here
Send us a load profile. We’ll send back a system.
Peak kW, nightly kWh, backup hours and the site’s latitude are enough to start. You get a sized configuration, a wiring sketch and a landed price within two business days.
Average first reply: 6 working hours
Lead time15–40 days
IncotermsFOB · CIF · DAP
OEM MOQ50 units