Battery & Energy Storage FAQ

A lithium iron phosphate backup battery built for the -48V DC systems used at base stations, outdoor cabinets and shelters. In practice it is 16 LiFePO4 cells in series, which gives a 51.2V nominal voltage. The industry still calls it "48V" because it is a drop-in replacement for the 48V VRLA strings that came before it.

Runtime depends on your site load, not on the battery alone. A 48V 100Ah module stores about 5.12 kWh; divide that by the site's DC load in watts to get hours, then derate for ageing and temperature. Because a smart BMS reports state of charge, that figure can be calculated from measured data rather than estimated.

In most cases yes. The pack is built to the same nominal voltage band as the VRLA string it replaces, so the rectifier and site equipment stay as they are. What does need checking is the charge profile your rectifier expects and whether you want the BMS communicating with your monitoring system.

Both describe the same pack. Sixteen LiFePO4 cells at 3.2V nominal each give 51.2V, which sits inside the operating range of a nominal 48V telecom system. "48V" is the system voltage everyone specifies; 51.2V is the actual pack nominal.

Telecom-grade LiFePO4 packs are commonly rated at 6,000+ cycles at 80% depth of discharge, against roughly 300-500 deep cycles for VRLA. The cycle count matters most at sites that discharge often — the difference shows up as a longer replacement interval rather than as a spec-sheet talking point.

Our telecom packs support RS485 and CAN at pack level, with SNMP available for integration into a network management system over IP. SNMP is usually the right choice when the battery needs to appear alongside the rest of the site equipment in an operator's existing monitoring stack.

Yes. Over SNMP the BMS reports state of charge, state of health, individual cell voltages, temperatures and alarms, and can send traps so faults surface in the NMS as they happen. For operators with geographically spread sites this is usually what turns scheduled site visits into exception-driven maintenance.

For most markets: IEC 62619 for stationary battery safety, UN38.3 for transport, and CE where applicable. Check that the certificates cover the specific model being supplied rather than a family name — that is the detail most often glossed over in a quotation.

Usually yes, provided three things match: the nominal voltage band (for example 384V DC), the charge profile the UPS expects, and the communication protocol. We configure the BMS to the host's protocol so the UPS recognises the pack instead of treating it as an unmanaged load.

It follows the UPS. Common configurations include 48V for smaller systems and higher-voltage strings such as 192V, 384V and 409V for larger three-phase units. A 384V pack is 120 LiFePO4 cells in series.

Through the protocol the UPS host speaks — typically Modbus RTU or Modbus TCP over RS485, with CAN as an alternative. Once matched, the UPS reads real SOC, SOH, cell voltages, temperatures and alarm states, which is what makes runtime prediction accurate.

The UPS falls back on terminal-voltage sensing. Runtime estimates revert to conservative defaults and cell-level faults are never reported to the monitoring system — the battery becomes a blind spot until someone tests it by hand.

Any UPS that accepts an external battery string at the matching voltage and can be configured for lithium charging. In practice that covers the common enterprise and industrial brands; the deciding factor is protocol and charge-profile compatibility, not the name on the front panel.

It depends on temperature and how often the battery is discharged. VRLA life shortens sharply above its 25℃ rating, so in warm UPS rooms it often needs replacing years earlier than planned. LiFePO4 tolerates heat better and delivers far more deep cycles, which is what extends the replacement interval.

Usually the charge voltage settings need adjusting for lithium, and the UPS may need to be told the battery type or capacity. We supply those settings with the pack so commissioning does not become a trial-and-error exercise on site.

Much faster than VRLA. LiFePO4 accepts high charge current through most of the charge curve, so the string returns to readiness during short grid availability windows instead of trailing a long absorption phase — which matters most where outages come in quick succession.

Battery energy storage system — the complete installation of battery modules, BMS, power conversion and control, not just the cells. The distinction matters because system behaviour depends on how those parts work together, not on the nameplate capacity of the pack.

Scale and objective. Residential systems are typically 5-20 kWh and optimise self-consumption of rooftop solar. Commercial and industrial systems run from 50 kWh to megawatt-hours and are usually justified by peak shaving, demand charge reduction and backup, where the site's load profile drives the business case.

From the load profile, not from a catalogue. You need the peak demand you want to shave, how long it lasts, the tariff structure — especially the peak-to-valley spread and any demand charges — and how much backup you require. A system sized from a generic template tends to end up either oversized or missing the highest-demand window.

Discharging the battery during the site's highest demand periods so the grid sees a lower peak. Because many commercial tariffs charge for the highest kW drawn in a billing period, this can be a larger part of the savings than the energy itself.

Yes — this is a common hybrid configuration. The energy management system dispatches PV to the load first, stores the surplus, covers peaks from the battery, and starts the generator only when stored energy is low or load exceeds what PV and storage can carry together.

PV to load first, surplus to battery, battery for peaks and shortfalls, diesel last. A minimum run time is normally enforced on the generator so it operates at efficient load rather than short-cycling, which is hard on the engine and expensive per kWh.

It varies by tariff and duty cycle — there is no honest single figure. The variables are the peak-to-valley spread, demand charges, how much of the battery's capacity is cycled daily, and cycle life. We size against the actual load profile and model it from there rather than quoting an average.

Typically IEC 62619 for the battery, plus the grid-connection and safety requirements of the local market — CE, or UL 1973 and UL 9540 in North America, for example. Confirm what your utility and insurer require before specifying, because those two often drive more of the requirement list than the battery standard itself.

Lithium iron phosphate — a lithium chemistry that trades some energy density for thermal stability, long cycle life and a flat discharge curve. That combination is why it has become the default for stationary backup and storage rather than for weight-critical applications.

It monitors every cell's voltage and temperature, balances the cells, enforces safe limits on charge and discharge current, estimates state of charge and state of health, and reports all of it upward. The pack is only as good as its BMS — most field failures trace back to protection and balancing rather than to the cells themselves.

State of charge is how full the battery is right now, like a fuel gauge. State of health is how much of its original capacity the pack can still deliver, like an engine wearing out. SOH is the number that tells you when a battery is genuinely approaching end of life.

No. Charging a LiFePO4 cell below 0℃ causes lithium plating and permanent damage. Cold-climate installations need a heating strategy: an insulated enclosure plus a BMS that blocks charge current until the pack has been warmed above the safe threshold. Discharging in cold is a separate limit from charging, and the two are often confused.

Heat accelerates ageing. For VRLA the common rule of thumb is roughly halved life for every 8-10℃ above its 25℃ rating. LiFePO4 tolerates heat better, and a BMS extends that further by derating charge current as cell temperature rises, so the cells spend less time at their thermal limit.

A self-heating chain reaction inside a cell that can propagate to its neighbours. It is prevented in layers: a stable chemistry (LiFePO4 is more stable than other lithium chemistries), cell-level monitoring, BMS protection that disconnects on over-temperature or over-current, and physical design that slows propagation between cells.

For most outdoor telecom and C&I installations, IP54 or better for dust and splashing, rising to IP65 where the cabinet faces driving rain or washdown. In hot, humid climates the sealing matters for a second reason: it is what keeps moist air out and makes condensation control possible in the first place.

Yes — that is core to what we do. Voltage, capacity, enclosure format and BMS protocol (CAN, RS485, Modbus, SNMP) are all configurable, and we match the BMS to the host equipment rather than asking you to change it. Protocol mismatch is the single most common cause of a difficult commissioning.

Yes. Because protocol matching and charge settings are where lithium retrofits succeed or fail, we supply the configuration details and support commissioning rather than shipping the pack and leaving the integration to you.

As dangerous goods, under UN38.3 test certification and the applicable transport regulations — IATA for air, IMDG for sea. We handle the classification and documentation; transit time depends on mode and destination.

For backup: the load in watts, required runtime, and existing system voltage. For C&I storage: the load profile if you have it, the peak you want to shave, your tariff structure, and whether solar or a generator is already on site. The more of the load profile you can share, the more accurate the sizing.

Yes. We supply the replacement pack, the charge settings for the existing rectifier or UPS, and the protocol configuration for your monitoring system. In most cases the site equipment stays in place and only the battery changes.