There is no universal off-grid battery size. Calculate how many watt-hours your equipment consumes each day, decide how long the system must operate between meaningful recharges and then size the battery bank around the required usable stored energy.

Multiply the wattage of each device by the number of hours it operates per day. For example, a 60W load running for eight hours consumes approximately 480Wh. Repeat the calculation for every load and add the figures together.

For many conventional 12V electric-fence applications, we recommend the Leoch SFL-85. It provides 85Ah capacity at a relatively low purchase cost, and there is generally little reason to pay for a more advanced battery unless the usage pattern requires it.

The SFL-85 is our straightforward choice for a typical compatible 12V clay pigeon trap. Always check the trap manufacturer's voltage and connection requirements before ordering.

AGM can be worthwhile for regularly cycled standalone 12V applications such as lighting, events and mobile display systems. For simple intermittent loads, flooded may be sufficient. For much heavier solar cycling, we would normally look toward Lead Carbon or lithium.

For demanding solar and frequently cycled applications, the Leoch LDC Lead Carbon range is our preferred non-lithium route. Its cyclic design, improved charge acceptance and partial-state-of-charge performance make it particularly relevant to off-grid solar duty.

Lead Carbon is an advanced lead-acid technology designed to improve charging behaviour and cyclic performance, particularly under demanding operating conditions. In our range, LDC batteries are positioned for traction, renewable energy and other heavy cyclic applications.

PSOC means partial state of charge. It describes a battery spending extended periods below a complete full charge, which is common in solar systems where charging availability changes with weather, season and electrical demand.

A solar battery may be discharged overnight and then receive only a partial recharge during a poor-weather day before being discharged again. Batteries designed to cope well with this repeated operating pattern are therefore particularly useful in demanding solar installations.

Lead Carbon is a strong option where you want heavy-duty cyclic performance while remaining with lead-acid technology. Lithium becomes particularly attractive where high usable energy, lower battery count, modular expansion and a modern 48V ESS architecture justify the additional investment.

Small systems commonly use 12V. As inverter power and total energy requirements increase, 24V and 48V systems become increasingly attractive because the same amount of electrical power can be transferred at lower current. Choose voltage around the complete system rather than the battery alone.

A higher system voltage reduces current for the same electrical power. This becomes particularly useful as inverter and charging power rises because very high current requires heavier cabling and places greater demands on connections and protection equipment.

Eight identical 6V batteries connected in series create a nominal 48V battery bank. The Ah capacity remains the same as one battery while the voltage adds together.

The Ah capacity stays the same while voltage increases. For example, four 6V 210Ah batteries connected in series create a 24V 210Ah bank.

Voltage remains the same while Ah capacity increases. Two compatible 12V 130Ah batteries connected in parallel provide approximately 12V 260Ah nominal capacity.

We generally recommend using matched batteries of the same technology, model, capacity and similar age. Mixing substantially different batteries can create charging, discharge and balancing problems.

It is generally preferable not to add a brand-new battery to a substantially aged bank. Batteries that have operated together for a long period may have significantly different internal characteristics from a new replacement.

This depends on how reliable your charging source is and how critical the connected loads are. A system with reliable generator backup may need less battery autonomy than a remote solar system expected to continue operating through several days of poor weather.

No. Battery capacity determines how much energy is stored. Inverter capacity determines how much AC power can be supplied at one time. Both must be sized correctly, but they solve different requirements.

Not necessarily. A powerful inverter can demand extremely high current from a low-voltage battery bank. The battery, cables, connections and protection equipment must all be capable of safely supplying the required current.

Yes. A suitable solar charge controller can charge flooded batteries when configured to the charging requirements of the battery being used.

Yes. Use a solar charge controller that provides a suitable AGM charging profile and charging voltage for the specific battery.

Yes. Lead Carbon is particularly relevant to solar applications, but the solar controller must still be configured to the charging requirements of the specific battery.

Yes, provided the solar controller and wider electrical system are compatible with the LiFePO4 battery. Larger ESS installations may also require compatible inverter communication and BMS configuration.

The battery bank supplies the difference between generation and consumption, causing its state of charge to fall. If poor generation continues for long enough, the batteries may eventually reach their permitted discharge limit unless another charging source is available.

If the system must operate reliably throughout the year, seasonal solar generation should be considered. Designing only around ideal summer output can leave a substantial energy shortfall during winter.

A nominal 48V 400Ah bank stores approximately 19.2kWh because 48V × 400Ah = 19,200Wh. This is nominal stored energy rather than guaranteed usable energy.

A 51.2V 100Ah battery stores approximately 5.12kWh of nominal energy. Compatible modules can be connected in parallel where supported to increase total storage capacity while retaining the same system voltage.

Modular ESS batteries are often designed specifically for expansion. The Leoch LFeLi-48100 supports up to 16 groups of parallel connections, subject to the manufacturer's installation requirements and compatible inverter and BMS configuration.

We strongly recommend professional design and installation for larger ESS systems. High-energy battery banks require correctly specified cabling, protection, isolation, inverter compatibility, earthing, battery configuration and commissioning.