Helpful selection guidance before the RFQ.

Sizing guide

1. Start with energy in Wh, not only battery capacity in Ah.

Amp-hours are meaningful only with voltage. At a basic nominal level, stored energy is voltage × amp-hours: a 12.8V 100Ah reference battery equals 1,280Wh (1.28kWh), while a 25.6V 100Ah reference battery equals 2,560Wh (2.56kWh).

For an RFQ, ask for the expected daily energy consumption, the appliances used at the same time, desired hours/days of autonomy, solar or vehicle recharge and the minimum expected ambient temperature. This produces a more credible capacity discussion than replacing a lead-acid label one-for-one.

Minimum input list

• Loads and daily usage hours, expressed in watts/Wh where possible.
• Largest simultaneous load and inverter model/current data.
• Available recharge sources and average recharge time.
• Reserve requirement and future expansion plan.

Next: compare reference platforms in the product range.

2. Treat series and parallel as an approved system design.

Series connection raises voltage; parallel connection raises capacity. Neither statement tells you whether a particular battery is approved for the resulting installation. Follow only the current final data sheet for the selected model.

The verified 12.8V 100Ah and 12.8V 300Ah data sheets supplied for this site state a maximum of 4S/4P for matched modules. The verified 25.6V 100Ah data sheet states 2S/4P. These figures are not transferable to other SKUs, and connection does not automatically raise the permitted per-module charge/discharge current.

Before approving expansion

• Use same voltage, capacity, configuration and approved matched modules/batches.
• Check balanced wiring, individual overcurrent protection, cable size and installation layout.
• Confirm BMS and system current boundaries under the actual load.
• Document how the battery bank will be charged, monitored and serviced.

3. Charge-source compatibility is a product requirement.

LiFePO4 projects commonly combine solar controllers, mains chargers, alternators or DC-DC chargers. Each source should be verified against the final battery's approved charge voltage, maximum current, temperature restrictions and BMS protection logic.

The three verified product data sheets used on this site list 0 to 45C charging and -20 to 45C discharging. Cold-weather charging needs particular care; do not assume a battery can accept a charge below its stated temperature range. RV alternator projects may require a suitable DC-DC charger or current-control strategy.

4. Use an RFQ that can be technically evaluated.

A useful B2B quote request describes the application, target market, batteries/voltage in scope, daily energy demand, continuous and peak current, chargers, installation space, operating temperatures, expansion plan, branding scope, annual demand and required documentation. This lets a supplier confirm scope instead of guessing from a product name.