You have already decided you want a LiFePO4 battery, and that is the right call: our complete buyer’s guide to LiFePO4 home batteries explains why it is the safest and longest-lived chemistry for a home that cycles through daily outages. This guide is the companion to that one. It does not repeat the chemistry or the specification definitions; it walks the decision itself, the part the spec sheets are designed to make hard.
Choosing well comes down to five steps: working out what your own home actually needs, matching capacity and form factor to your situation, verifying the manufacturer in writing, spotting the red flags that mark a weak or fake product, and planning an installation that survives a Ukrainian winter. Genixgreen has manufactured LiFePO4 storage systems in its own factory since 2011 and supplies distributors in 100+ countries, and the aim here is a guide a dealer can hand straight to a customer.
The short answer
Choose a LiFePO4 battery for an inverter in five steps: define critical loads and outage conditions, size usable capacity, select the form factor, verify documents and written compatibility, then plan installation. Before ordering, obtain the inverter voltage range, continuous-current limits, BMS protocol, and manufacturer-approved configuration. Confirm applicable compliance requirements with the supplier and installer, and use a qualified electrician for fixed wiring.
Step 1: Start with your home, not the catalogue
The most common buying mistake is to start from a product, fall for a headline number, and work backwards. Start from your own home instead. Four questions answered before you look at any product decide almost everything that follows.
List only the loads you must keep running
Make two columns. The first is what must stay on during an outage; the second is what can wait until the power returns. The first column is usually shorter than people expect: a refrigerator, lighting in a couple of rooms, the router and the ONT that keep you online, phone and laptop charging, and on a gas-heated home the boiler’s circulation pump, which is what actually keeps the heating working when the grid is down. Air conditioning, an electric kettle, an oven, and a washing machine almost always belong in the second column for a battery sized to ride out blackouts.
Add up the first column only. Record the measured watts and expected running time for each critical load instead of relying on a generic apartment or house benchmark. An honest load list matters because sizing to the whole home instead of the critical loads is how buyers end up paying for capacity they will not use.
Measure your longest realistic outage, not the average
Size for your worst regular window, not a typical one. Outage schedules in Ukraine vary by region and by season, and the hardest winter days run longer than the autumn norm, so the figure that matters is the longest stretch you expect to face on a bad day. Check your own oblast’s published outage schedule and ask your supplier what autonomy they plan around. That window, multiplied by your critical load, is the energy your battery has to store between recharges.
Decide now whether you will expand later
This decision looks minor and quietly sets your form factor, so make it before you buy rather than after. If there is any chance you will add capacity later, perhaps because you plan to add solar, move to a larger home’s needs, or simply want more margin once you live with the system, then you need a form factor that grows without being replaced. If your needs are fixed and modest, a sealed single unit is simpler and cheaper. Buying a form factor that cannot grow and then needing more is the most expensive way to discover this question.
Before adding a second LiFePO4 battery
Plan expansion around the approved battery configuration, not just the available floor space. The same voltage label is not permission to connect two batteries in parallel.
- Adding the same model: check the permitted module count, hardware and firmware revisions, and the commissioning procedure in the manufacturer documentation.
- Mixing capacities, models or old and new batteries: obtain explicit manufacturer approval for the exact combination before buying another unit. Do not assume that matching voltage or chemistry is enough.
- Adding capacity to an installed system: ask the installer to reassess inverter limits, protection, cabling and communication settings for the expanded configuration.
If approval is unclear, pause the extra battery purchase until the configuration is confirmed. Record the exact models and versions now so that a later expansion decision does not depend on guesswork.
Check your space, and whether it stays warm in winter
Where the battery will physically live affects both form factor and cold-weather requirements. Record the site’s temperature range, available clearance, ventilation, escape-route constraints, and whether the wall or floor can bear the unit’s weight. An unheated garage, balcony, or outdoor enclosure may fall outside a product’s permitted conditions, so compare the site with the specific manual and have the installer assess it before purchase.
Step 2: Match capacity and form factor to your home
With those four answers in hand, you can match a product to your home. The pillar guide explains voltage, usable capacity, continuous current, BMS communication and approved compatibility; here we use them only to make the decision and link back rather than repeat them.
Sizing, in one rule of thumb
Size from your load, not from a box rating. Take average critical load, multiply by the longest outage, then compare that need with the battery’s documented usable capacity while allowing for documented system losses, temperature derating, and contingency. Do not treat a generic efficiency percentage or a home-type benchmark as guaranteed outage energy.
| Input to record | Why it changes the result |
|---|---|
| Critical loads and measured watts | Defines the power and energy the system must supply |
| Realistic outage window | Defines how long those loads must run before recharge |
| Documented usable capacity | Replaces nameplate capacity with energy the product permits you to use |
| Documented losses and temperature derating | Prevents ideal-condition figures from becoming a runtime promise |
| Reserve and future expansion | Keeps the initial design from consuming all available margin |
Nominal versus usable: the number that misleads first
Before you compare two products on capacity, confirm you are comparing the same thing. A “10 kWh” battery does not give you 10 kWh: usable energy is the nameplate figure multiplied by the depth of discharge, and a LiFePO4 unit running at 80 to 95 percent depth of discharge genuinely delivers roughly 8 to 9.5 kWh, as Battery University (BU-808) sets out. Always ask a seller whether a quoted capacity is nominal or usable. A product that looks cheaper per kWh on nominal capacity can be the more expensive one on usable capacity, which is the number you actually live with.
Form factor, decided by space and expansion
Your space and your expansion answer from Step 1 point straight at a form factor. The three form factors and their definitions are covered in the pillar guide; the decision is simpler than the definitions.
| Your situation | Form factor that fits | Why |
|---|---|---|
| Apartment, fixed needs, 5 to 15 kWh, heated room | Wall-mount | Saves floor space; confirm the exact battery-inverter configuration and permitted module count in manufacturer documentation |
| House, expects to grow to 20 to 30 kWh | Rack-mount | Add modules over time without replacing the system |
| Renter or minimal-install building, simplicity first | All-in-one | May reduce matching work within one specified product; use as plug-in only when the manufacturer and local rules explicitly allow it |
The trade is straightforward. Wall-mount is a common apartment choice, but the permitted parallel-module count comes from the manufacturer. Rack-mount can grow, but expansion remains limited by manufacturer module count, continuous current, busbar, BMS and inverter limits. An all-in-one can simplify a specified configuration, but it is plug-in only when the manufacturer explicitly designs it for that use, no fixed wiring is required, and local rules allow it. Otherwise, route installation to a qualified electrician. Pick the form factor that matches the expansion answer you already gave yourself, not the one with the most impressive single-unit headline.
Step 3: Verify the maker before you trust the spec sheet
This is the step where good money is lost, because a spec sheet is a marketing document until it is backed by evidence. A reputable supplier answers every one of the following in writing, without hesitation and without changing the subject. Treat reluctance as an answer in itself.
Demand the certifications, and the reports behind them
Three document categories matter for a home battery sold in Ukraine, and each must be checked against the destination market and product route.
| Certification | What it proves | What to demand |
|---|---|---|
| IEC 62619:2022 | System-level safety: overcharge, over-discharge, short circuit, thermal abuse, and thermal-runaway propagation | The 2022 edition specifically, which added mandatory thermal-propagation testing, plus the test report, not just a certificate image (IEC 62619:2022) |
| UN 38.3 | Transport testing and documentation for lithium batteries | Ask for the applicable transport document. A missing document needs supplier clarification, but does not by itself prove that cells are uncertified (UNECE) |
| CE documentation, where applicable | EU and EEA regulatory route | Ask which documentation applies to the destination market. CE documentation alone does not establish compliance in every market, including Ukraine |
If a seller offers IEC 62619 in the 2017 edition only, that predates the mandatory thermal-propagation test, so ask specifically for the 2022 edition and the report.
See through the two specifications sellers inflate most
Two numbers are inflated more often than any others, and both are easy to check once you know the trick.
The first is capacity, covered above: nominal quoted as if it were usable. The second is cycle life. Cycle life is the number of charge-and-discharge cycles before capacity falls to 80 percent of the original rating, and the honest figure depends entirely on the test conditions. A headline of several thousand cycles measured at a shallow depth of discharge, a very low charge rate, or a comfortable 25 °C looks impressive but does not describe daily Ukrainian use, as Battery University (BU-808) explains. Ask for the test conditions in writing: the depth of discharge, the charge rate, and the temperature. A supplier who states them is selling you an honest number; a supplier who cannot is selling you a marketing headline.
Confirm the BMS talks to your inverter
The battery management system is the safety brain of the battery, and one detail decides whether it will work cleanly with your setup. Confirm that the BMS supports closed-loop communication over CAN or RS485 and that the protocol is compatible with your inverter, so the inverter can adjust charge and discharge to the battery’s real-time state. Confirm too that the BMS hard-cuts charging below 0 °C, the cold-charge protection that Step 5 depends on. A battery that cannot talk to your inverter, or that lacks a cold-charge cutoff, is the wrong battery regardless of its headline capacity.
Request a written match before you place the order
Ask the manufacturer or authorised supplier to confirm the exact battery and inverter configuration in writing, including the inverter battery-voltage range, usable capacity required for your loads, continuous charge and discharge current, and the supported CAN or RS485 protocol. Similar voltage labels, connectors, or a communication port do not prove that two products will work together. This article uses that check as a buying gate; the battery-to-inverter matching guide explains each parameter without turning this page into a broad matching hub.
Step 4: The red flags that should stop a purchase
Some findings are not negotiating points; they are reasons to walk away. If you see any of these, stop and look elsewhere, because each one signals that the product cuts corners exactly where safety and honesty live.
- No identifiable manufacturer, or unbranded cells with no traceable origin.
- A self-declared certificate with no test report, or a CE mark with no signed Declaration of Conformity on request.
- An impressive cycle-life headline with no stated test conditions.
- IEC 62619 quoted in the 2017 edition only, with no 2022 thermal-propagation test.
- Transport documentation that the supplier cannot explain for the product and route.
- A seller who cannot, or will not, say whether a quoted capacity is nominal or usable.
None of these is about price. A cheaper battery from an honest maker who shows you the reports is a far better purchase than a dearer one that fails this list. The point of the checklist is to make the corners visible before the money moves, not after the first cold night.
Step 5: Plan the installation for a Ukrainian winter
The last step is the one most specific to Ukraine, and getting it wrong can permanently damage an otherwise good battery on its first cold night.
Keep it in a heated indoor space
The hard rule is that a standard LiFePO4 battery must not be charged below 0 °C. Below freezing, lithium ions can plate as metallic lithium on the anode, permanently reducing capacity and potentially creating an internal hazard, as Battery University (BU-410) explains. Discharge temperature limits, low-temperature power derating, and BMS cut-off behaviour are model-specific. Use the product manual and have the installer verify that the selected battery can support the intended critical loads at the site’s winter temperature.
Choose a conditioned indoor location that remains within the product’s documented temperature, clearance, ventilation, and fire-safety conditions. Have a qualified installer assess the location against the product manual and local requirements. If the only available location can drop below 0 °C, use manufacturer-integrated self-heating only when the specific manual permits charging under those conditions. Do not add an external heating device as a substitute for the manufacturer’s low-temperature design.
Route hardwired work to a qualified electrician
Match the installation to the product instructions and local rules. Any hardwired connection to your home’s mains wiring, which includes most wall-mount and rack-mount systems, must be installed by a qualified electrician. Treat an all-in-one as plug-in only when its manufacturer explicitly designs it for plug-in use, no fixed wiring is required, and local rules allow it; otherwise use a qualified electrician. Decide before you buy who will install the system, because that answer can rule a form factor in or out.
A one-page buying checklist for Ukraine
Take this to any supplier. A reputable one will not flinch at a single line.
- Needs: critical-load list made, longest expected outage estimated for your region, expansion decision made, install location and its winter temperature known.
- Sizing: capacity sized from load times outage hours, using documented usable capacity and an allowance for system losses and contingency, not a generic efficiency guarantee.
- Documents: applicable IEC 62619 test documentation, relevant UN 38.3 transport documentation, and an explanation of the destination-market compliance route.
- Specifications: cycle-life test conditions stated in writing (depth of discharge, charge rate, temperature).
- BMS: closed-loop CAN or RS485 confirmed compatible with your inverter, with a cold-charge cutoff below 0 °C.
- Cold weather: conditioned indoor location confirmed, or a manufacturer-integrated self-heating product selected if the location can drop below 0 °C; a qualified installer confirms the documented limits.
- Installation: a qualified electrician booked for any hardwired connection. Treat a unit as plug-in only when the manufacturer explicitly permits it, no fixed wiring is required, and local rules allow it.
- Supplier: warranty and service terms confirmed in writing, with service available inside Ukraine.
Frequently asked questions
How do I choose the right size of home battery?
Size it from your own loads, not from a product headline. List the appliances that must run during an outage, estimate the longest realistic outage, multiply average critical load by outage hours, then use documented usable capacity and allow for system losses and contingency. Do not treat a generic efficiency percentage as guaranteed outage energy.
Which battery form factor should I buy: wall-mount, rack-mount, or all-in-one?
It depends on your space, expansion plan, product documentation and local rules. Wall-mount can suit an apartment with fixed needs and a heated room, subject to the documented battery-inverter configuration. Rack-mount can grow by adding modules within the manufacturer, current, busbar, BMS and inverter limits. An all-in-one may simplify a specified configuration, but it is plug-in only when the manufacturer explicitly permits it, no fixed wiring is required, and local rules allow it. Otherwise, use a qualified electrician.
How can I tell if a battery’s specifications are honest?
Ask for two things in writing. First, whether a quoted capacity is nominal or usable, because usable is the number you live with. Second, the conditions under which cycle life was tested: the depth of discharge, the charge rate, and the temperature. A headline cycle-life number with no stated conditions is a marketing figure, not a usable one. An honest supplier provides both without hesitation.
What should I confirm before buying a battery for an inverter?
Ask for written confirmation of the inverter battery-voltage range, usable capacity for your critical loads, continuous charge and discharge current, BMS protocol, and the approved battery-inverter configuration. Similar voltage labels, connectors, or communication ports do not prove compatibility. The battery-to-inverter matching guide explains why each item matters.
Which certifications should a home battery have?
Ask for the applicable IEC 62619 test documentation, the relevant UN 38.3 transport document, and an explanation of the compliance documentation required for the destination market. CE documentation relates to the EU and EEA route and does not alone establish compliance in Ukraine. A supplier who cannot explain documents, test conditions, or the destination-market route needs further scrutiny.
Can I install a home battery in an unheated garage in Ukraine?
Only if it has manufacturer-integrated self-heating and the documented installation conditions are met. A standard LiFePO4 battery must not be charged below 0 °C, because charging below freezing causes permanent lithium plating. It will discharge in the cold, but charging has to happen above 0 °C. Use a conditioned indoor location where possible; if an unheated location is unavoidable, have a qualified installer confirm a manufacturer-integrated self-heating product and local requirements.
Do I need an electrician to install a home battery?
Any hardwired system connected to your home’s mains wiring, which includes most wall-mount and rack-mount installations, must be installed by a qualified electrician. A unit may be treated as plug-in only when its manufacturer explicitly designs it for plug-in use, no fixed wiring is required, and local rules allow it; otherwise use a qualified electrician.
The right next step
Choosing a home battery comes down to matching a certified LiFePO4 unit to your load, your space, and your winter, and then verifying it in writing before you pay. For the full specification definitions and the chemistry behind the choice, start with our complete LiFePO4 buyer’s guide. If you are weighing chemistries, see how LiFePO4 compares with lead-acid for backup power, and for the chemistry and the safety differences, see LiFePO4 versus ordinary lithium-ion. To see the range, including the systems we hold in our Odesa-region warehouse for fast local supply, visit our product range. If you are a dealer or installer serving customers in Ukraine, our partners page explains how to work with us.