Solar / Backup

Cycling and
Standby Duty.

Two duty cycles, one page. Solar and off-grid cycling on the left. Standby and telecom backup on the right. Pick the duty and see the applicable ATB series.

Solar Battery Sizing Calculator

Size Your Bank in Seven Inputs.

Enter your system parameters below. The calculator applies the standard off-grid sizing formula and recommends a matching ATB bank configuration.

Your recommended ATB bank configuration will appear here once all seven inputs are set.

Reference tool only. Formula: Required Ah = (Daily Wh × Autonomy) / (System V × DoD × Temp Derate × Inverter Eff). Temperature derate factors follow IEEE 1013 sizing practice for lead-acid PV banks. Final bank sizing should account for charge controller limits, cable runs, ambient swing, and expected cycle count. Contact ATB sales for an engineered proposal.

Why Solar is Different

Float Batteries Fail in Solar Duty.

UPS and Telecom Float

Battery sits at 100 percent state of charge for years. Discharge is rare. Grid keeps the float voltage stable. Thin plates and low self-discharge work fine.

Solar and Off-Grid Cycling

Battery discharges every night. Recharges during sun hours. Often sits at partial state of charge for days. Ambient temperature runs hot. Float-grade AGM is not specified for these conditions and can lose capacity in 12 to 18 months under partial-state-of-charge operation.

Solar needs cycling-duty plate design, not standby plate design. The ATB range covers both. The tiers below map real daily load to the right series.

System Sizing

Pick the Tier that Matches Your Daily Load.

Daily load in watt-hours drives capacity. Autonomy days, depth-of-discharge target and ambient temperature shape the final specification. Match your load to a tier below, then contact us for sizing against your exact system.

  • Small Rural Solar Home Systems

    Up to 1 kWh daily load. Lights, fan, phone charging, small TV, radio.

    Light cycling duty. GP general-purpose AGM serves this tier where depth-of-discharge stays under 40 percent and charge cycles are shallow. Sealed, maintenance-free and tolerant of rural install conditions.

    Recommended ATB models: GP12-18 GP12-26 GP12-35 GP12-55

  • Small Home, Clinic or Shop

    1 to 3 kWh daily load. Lighting, fans, fridge, small inverter duty.

    Daily cycling. DC deep-cycle AGM handles up to 80 percent DoD on shift duty with partial state-of-charge rest between charges. Heavy positive grids and high-density active paste for cycle life.

    Recommended ATB models: DC12-35 DC12-55 DC12-85

  • Residential Daily Solar

    3 to 10 kWh daily load. Full home inverter, AC starter, appliance loads, metro residential backup.

    Deep daily cycling. DC12 series in the 105 to 260 Ah band matches most single-house installs. Plate thickness and grid alloy tuned for cycling, not cranking. Installable in multiple orientations and gas-recombinant sealed.

    Recommended ATB models: DC12-105 DC12-125 DC12-180 DC12-210 DC12-260
Residential rooftop solar array
Five Series. One Solar Toolkit.
Match Chemistry to Duty.

AGM GP for solar home systems. AGM DC for residential off-grid cycling. Gel DC for hot-climate banks. AGM LC for PSoC self-consumption. AGM 2V cells for utility-scale strings.

Solar Range — Five Product Series

Match Chemistry to Duty.

Five series cover the full solar and off-grid range, sized for the realities of African solar duty — daily deep cycling, partial state-of-charge, hot ambients and utility-scale banks. Every model below is a current ATB SKU.

Sizing guidance. Backup sizing runs from required runtime in minutes (UPS) or hours (telecom / emergency). End-of-discharge voltage, ambient temperature and expected float voltage shape the specification. Contact ATB sales for a runtime calculation.

Telecom tower with radios
Telecom and UPS
Standby Power that Stays Standby.

GP, FT, and HR Series cover three to ten year design float life in telecom huts, UPS rooms, and remote sites.

Need sizing help or a distributor quote?

Contact Our Team