Solar battery charger BS12 series

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Product Overview
Smart 12V DC-DC battery charger available in two main models (BS123020, BS126030). Provides DC-DC charging from vehicle alternator and optional MPPT solar input; supports GEL, Sealed Lead Acid, AGM, LiFePO4 and ternary lithium chemistries. Dimensions and weights: BS123020 190x194x70mm / 1.44kg; BS126030 190x215x70mm / 1.6kg. Warranty: 2-year.

Application
On-board charger designed for motorhomes, campers, marine vessels and other vehicles to charge the house/main battery from the vehicle alternator or solar panels where fitted.

B2B Charge

• Charges the main (house) battery from the vehicle alternator via the starter battery.
• Delivers full-power DC-DC charging while the engine is running to maximise charging speed.
• Boosts or steps down voltage/current to follow the selected battery charging profile.

MPPT Solar Charge

• Integrated MPPT improves solar charging efficiency by 10–30% compared with direct connection.
• Manages charge current and voltage to follow standard charge curves for supported chemistries.
• Provides low-rate maintenance charging for the starter battery during long periods of inactivity.

Technical Parameters (summary)

• Models: BS123020 (12V/30A DC-DC, 12V/20A solar, 250W max solar) — BS126030 (12V/60A DC-DC, 12V/30A solar, 430W max solar).
• Main battery voltage: 12V.
• Supported main battery types: GEL, Sealed Lead Acid, AGM, LiFePO4, Ternary lithium.
• Starting battery: 12V lead-acid.
• Solar input max voltage: 50V; self-consumption current: 24mA.
• Dimensions & weight: BS123020 190x194x70mm / 1.44kg; BS126030 190x215x70mm / 1.6kg.
• Accessories: Display MT-2, Bluetooth module BT10, Temperature sensor TRS.
• Warranty: 2-year.

DC12V → DC12V (models & charging)

• B2B1230 — 12V→12V, DC-DC 12V/30A.
• B2B1260 — 12V→12V, DC-DC 12V/60A.
• BS123020 — 12V→12V, DC-DC 12V/30A, Solar 12V/20A (max 250W).
• BS126030 — 12V→12V, DC-DC 12V/60A, Solar 12V/30A (max 430W).
• BS126045 — 12V→12V, DC-DC 12V/60A, Solar 12V/45A (max 620W).

Other supported conversions (examples)
Additional model variants support conversions such as DC12V→DC24V, DC24V→DC24V and DC24V→DC12V for applications requiring different bus voltages; contact supplier for model selection and configuration.

Technical specifications

• Product type: Smart on-board DC-DC battery charger for RVs, campers and boats.
• DC-DC maximum charging current: 30A or 60A depending on model.
• Solar maximum charging current: up to 50A on specific variants.
• Maximum supported solar power examples: 250W, 430W, 620W.
• Features: alternator-to-main charging (B2B), MPPT solar charge, boost/step-down charging, starter battery trickle maintenance.