Best Batteries for 24V and 48V Solar Arrays

For an already specified 24V solar battery system, start with the RELiON RB24V100; for a nominal-48V system using a supported Victron arrangement, our starting pick is the Pytes V5°. Choose the RELiON RB48V100 when your design needs its higher continuous discharge current and the inverter maker accepts the proposed battery arrangement, after resolving its charging-specification conflict.

This shortlist covers component batteries for a system whose voltage and inverter have already been selected. For an installed hybrid or whole-home package, start with our home battery backup guide; for a smaller system, see our 12V LiFePO4 solar guide. Home backup systems need a licensed electrician and a permit where required.

Qualify the system before choosing a battery

Ask your supplier to put the inverter's battery-voltage window, required communication protocol, continuous and starting demand, and charging limits on the quotation. Include the controller's battery compatibility separately from its solar-input specifications. If the inverter requires an approved communicating battery, use a documented combination; a matching nominal-voltage label is insufficient.

1. 1

   Confirm the battery bus

   Get the inverter and charge-controller battery requirements for the specified system.

2. 2

   Confirm the control method

   Establish whether the inverter requires an approved BMS communication link.

3. 3

   Qualify the complete bank

   Have the supplier check continuous demand, starting demand, charging limits and winter conditions.

Quick picks and comparison

Compare specifications and all conditions

24V; separately configured charging accepted

Starting pick

RELiON RB24V100

Purchase condition

Its charge profile and 100A discharge limit must fit the design

Nominal 48V; supported Victron BMS communication

Starting pick

Pytes V5°

Purchase condition

Include the GX device, correct communication hardware and supplier-sized battery bank

Nominal 48V; higher continuous discharge demand

Starting pick

RELiON RB48V100

Purchase condition

Confirm inverter acceptance and resolve the charge-voltage discrepancy

Full comparison table ↔

Swipe to compare. Row labels stay visible.

Your specified system	Starting pick	Purchase condition
24V; separately configured charging accepted	RELiON RB24V100	Its charge profile and 100A discharge limit must fit the design
Nominal 48V; supported Victron BMS communication	Pytes V5°	Include the GX device, correct communication hardware and supplier-sized battery bank
Nominal 48V; higher continuous discharge demand	RELiON RB48V100	Confirm inverter acceptance and resolve the charge-voltage discrepancy

Your specified system	Starting pick	Purchase condition
24V; separately configured charging accepted	RELiON RB24V100	Its charge profile and 100A discharge limit must fit the design
Nominal 48V; supported Victron BMS communication	Pytes V5°	Include the GX device, correct communication hardware and supplier-sized battery bank
Nominal 48V; higher continuous discharge demand	RELiON RB48V100	Confirm inverter acceptance and resolve the charge-voltage discrepancy

These are manufacturer figures for individual batteries, not complete-system AC ratings.

Compare specifications and all conditions

RELiON RB24V100

Nominal voltage; energy

25.6V; 2,560Wh

Charging guidance

28.4–29.2V recommended; 100A maximum

Continuous discharge

100A

All specifications

Timed peak discharge

200A for 7.5 seconds ±2.5 seconds

Case / handling

IP67; 61.1 lb

Pytes V5°

Nominal voltage; energy

51.2V; 5.12kWh

Charging guidance

BMS-managed in the supported system; 47.5–57.6V is its operating range

Continuous discharge

75A recommended; 100A maximum

All specifications

Timed peak discharge

121–180A for 15 seconds

Case / handling

Match the enclosure; 97 lb

RELiON RB48V100

Nominal voltage; energy

51.2V; 5,120Wh

Charging guidance

Recommended range differs between official sources; upper endpoint 58.4V

Continuous discharge

200A

All specifications

Timed peak discharge

250A for 4 seconds ±1 second

Case / handling

IP65; 136.7 lb

Full comparison table ↔

Swipe to compare. Row labels stay visible.

Exact battery	Nominal voltage; energy	Charging guidance	Continuous discharge	Timed peak discharge	Case / handling
RELiON RB24V100	25.6V; 2,560Wh	28.4–29.2V recommended; 100A maximum	100A	200A for 7.5 seconds ±2.5 seconds	IP67; 61.1 lb
Pytes V5°	51.2V; 5.12kWh	BMS-managed in the supported system; 47.5–57.6V is its operating range	75A recommended; 100A maximum	121–180A for 15 seconds	Match the enclosure; 97 lb
RELiON RB48V100	51.2V; 5,120Wh	Recommended range differs between official sources; upper endpoint 58.4V	200A	250A for 4 seconds ±1 second	IP65; 136.7 lb

Exact battery	Nominal voltage; energy	Charging guidance	Continuous discharge	Timed peak discharge	Case / handling
RELiON RB24V100	25.6V; 2,560Wh	28.4–29.2V recommended; 100A maximum	100A	200A for 7.5 seconds ±2.5 seconds	IP67; 61.1 lb
Pytes V5°	51.2V; 5.12kWh	BMS-managed in the supported system; 47.5–57.6V is its operating range	75A recommended; 100A maximum	121–180A for 15 seconds	Match the enclosure; 97 lb
RELiON RB48V100	51.2V; 5,120Wh	Recommended range differs between official sources; upper endpoint 58.4V	200A	250A for 4 seconds ±1 second	IP65; 136.7 lb

The Pytes manual qualifies recommended and maximum continuous current at cell temperatures of 10–40°C, with derating outside that range. Its operating-voltage range is not a charger setpoint. Comparison sources: RELiON's RB24V100 datasheet, RB48V100 datasheet, and the Victron-linked Pytes manual.

Best 24V starting point: RELiON RB24V100

The RB24V100 is the straightforward shortlist entry when your specified system accepts 25.6V nominal, 2,560Wh and 100A continuous discharge. Its recommended charging current is 5–50A, versus a 100A maximum. Have the designer include every charging source in that limit rather than sizing only the solar contribution.

The useful distinction is its IP67 case and published electrical limits, rather than a generic lithium label. The purchase still depends on inverter acceptance of the proposed control arrangement; we establish no named communicating inverter pairing for this RELiON model here.

Check the physical revision: the product page gives 20.6 × 10.5 × 8.7 inches, while its linked datasheet gives 20.5 × 10.5 × 8.7 inches. Both state 61.1 lb. Get the supplied unit's drawing before ordering a tight compartment or tray. It also permits only one battery in series, so this is not our route to a higher-voltage bank.

See official specifications and dealer options.

Best nominal-48V pick for supported Victron systems: Pytes V5°

Choose this 51.2V, 100Ah, 5.12kWh module when the design calls for a managed battery with a documented inverter relationship. Pytes publishes a Victron configuration guide, and Victron independently documents Pytes compatibility.

Buy the V5° with PHOENIX M6 terminals, with heating confirmed. The V5°α in the linked manual uses Amphenol SurLok Plus 8.0mm terminals. The current V5° datasheet describes integrated heating; the older, Victron-linked manual calls heating optional. Resolve the supplied package's equipment with the dealer instead of assuming every similarly named unit includes it.

The 100A maximum is above the 75A recommended continuous current. Have the supplier size the bank for your inverter, rather than treating a single module as sufficient. Pytes' published US package example pairs two MultiPlus-II 120V 48/3000/35-50 units with three V5° batteries and a Cerbo GX. That is a package example, not a universal minimum.

See the exact V5° and enclosure options.

Best nominal-48V option for higher current: RELiON RB48V100

The RB48V100 combines 51.2V nominal and 5,120Wh with 200A continuous discharge, compared with the Pytes module's 100A maximum. That makes it worth assessing when discharge current drives the design. Its 250A peak lasts 4 seconds ±1 second; it does not replace the continuous rating.

The tradeoff is handling: this is a 136.7 lb steel-case battery with an IP65 rating. Its datasheet allows only one battery in series. We establish no named communicating inverter pairing for this model; obtain inverter-maker acceptance of your proposed configuration.

Resolve this before checkout: RELiON's product page recommends 56.8–58.4V, while the linked datasheet recommends 56.0–58.4V. Ask RELiON which profile applies to the supplied revision and have the designer reconcile it with the charger. A published BMS protection threshold is not permission to charge above the recommended profile.

See official specifications and dealer options.

Buying advice: voltage, power and winter charging

Nominal voltage is a system label, not the charging target

The RELiON examples make the distinction concrete: the 24V model is 25.6V nominal and recommends 28.4–29.2V charging; the 48V model is 51.2V nominal. Pytes also specifies 51.2V nominal, but its manual's operating range ends at 57.6V. Do not transfer RELiON's 58.4V charging endpoint to the Pytes battery.

For the supported Pytes/Victron pairing, the GX communication carries charging and discharge limits. Keep those controls in the system specification rather than buying a battery and improvising a generic lithium preset afterward.

Check discharge power separately from stored energy

As a calculation at nominal voltage, 25.6V × 100A = 2,560W DC for the RB24V100, before inverter losses. That is not a guaranteed AC output rating or the available power throughout discharge. Have the supplier calculate demand at the design's lower battery voltage and account for conversion losses and motor starts. Compare the required surge duration with the battery's timed peak, not its short-circuit protection threshold.

For capacity, use watt-hours and your intended loads. An illustrative, capacity-only estimate at an assumed steady 100W is 5,120Wh ÷ 100W = 51.2 hours, before losses, reserve and heating. Size from your own daily energy use and recharge opportunities; that arithmetic is not a promised runtime.

Series permission belongs to the exact model

Both RELiON picks specify one battery maximum in series. For contrast, Renogy's RBT24100LFPSH Core LT manual permits up to two in series. That example is a model-specific permission, not a Renogy purchase recommendation here. Have a professional specify the complete bank, approved batteries and protection equipment; do not assume another product's arrangement transfers.

Cold charging: cutoff, reduced current and heating differ

RELiON's datasheets explicitly limit charging to 10A from −10°C to 0°C, and 5A from −20°C to −10°C, for these models. Those are model-specific reduced-current permissions. Ask how the complete charging system will enforce them; a warm-weather maximum is not the winter allowance.

Pytes' current datasheet says its heating film needs an external charging source. It describes heating at −18°C to 5°C ambient, with control thresholds on at 5°C or below and off at 15°C or above. Reserve winter charging energy and time for warm-up before expecting replenished storage. Also resolve the integrated-versus-optional heater wording noted above.

What the complete purchase needs

For the Pytes/Victron combination, Victron specifies a GX device, the VE.Can to CAN-bus BMS Type A cable, ASS030710018, and the appropriate terminator. Its documented minimums are GX firmware v3.31, Pytes firmware 1.10.18 and VE.Bus firmware 469. The supplier must confirm current firmware and the required battery count for your exact inverter. Victron also requires communication between the solar charger and GX so charging limits can be controlled.

Ask for an itemized quotation covering the exact battery revision, matched enclosure or rack, power and communication cables, monitoring equipment, charging hardware, protection equipment and professional commissioning. Pytes' package document lists accessories separately; do not treat a battery-only offer as a complete system.

• Yes: The exact battery and inverter combination is accepted by their makers
• Yes: Charging limits cover the combined sources and the expected cell temperature
• Yes: The quotation includes the specified enclosure, cables, controls and protection
• Partly: Heating equipment matches the supplied battery version and the winter recharge plan
• No: Buying on capacity alone without confirming system compatibility

Before paying, have the designer confirm the lowest planned operating voltage, simultaneous load and starting demand, winter charge-current enforcement, communication hardware and supplied bank size. Keep the written answers with the quotation.

How we choose

We compare official product specifications, linked datasheets and model-specific manuals. We retain a named communicating inverter combination only when battery-maker documentation and inverter-maker documentation support it. Conflicts remain visible, and awards describe suitability for a specified system. These are document-based recommendations; we have not physically evaluated the batteries. See our disclosure.

Verdict

Start with RELiON RB24V100 for a compatible 24V design. Choose Pytes V5° for the documented Victron communication route, with the correct bank size and heating package confirmed. Assess RELiON RB48V100 for higher continuous current once its charging-profile discrepancy and inverter acceptance are resolved. Buy against the complete system quotation, not the largest capacity label.