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Solar battery maintenance

Keep a stored battery charged without guessing.

Start with the battery chemistry, rated voltage, capacity, storage conditions, and any standby draw. The TM522-D family is for one supported 12 V battery during storage.

Compare the three packagesBrowse battery maintainers

These products charge and maintain one supported battery. They do not supply lights, pumps, tools, or other loads.

Choose from the battery out to the panel

  1. Battery

    Confirm 12 V rating, chemistry, capacity, and condition.

  2. Storage

    Note the storage period, standby draw, shade, and winter exposure.

  3. Controller

    Keep the controller and connections dry and protected.

  4. Solar package

    Choose 10 W, 20 W, or 40 W only after the first three checks.

TM522-D

Three outputs for one supported 12 V battery.

The current family supports 12 V lead-acid and 12.8 V or 13.2 V four-cell LiFePO4 batteries. Panel wattage alone does not make the choice.

10 WCurrent Enerwav product

OptiMate TM522-D1

0.83 A maximum average

OptiMate TM522-D1 10 W solar battery maintainer package

The lowest-output package in the current TM522-D range.

Confirm that the available sun and this charging current can cover the battery's storage losses.

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20 WCurrent Enerwav product

OptiMate TM522-D2

1.67 A maximum average

OptiMate TM522-D2 20 W solar battery maintainer package

The middle-output package in the current TM522-D range.

A larger panel does not replace the battery, storage, and standby-draw checks.

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40 WCurrent Enerwav product

OptiMate TM522-D4

3.33 A maximum average

OptiMate TM522-D4 40 W solar battery maintainer package

The highest-output package in the current TM522-D range.

Check the battery maker's charging limits and the installation before choosing it.

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Common uses

For a stored battery, not for powering equipment.

01

Motorcycle and powersport

A stored motorcycle, ATV, snowmobile, or personal watercraft battery.

02

Car and pickup

A supported starting battery in a vehicle that sits for long periods.

03

Boat in storage

One supported battery, with the controller and connections kept protected.

04

RV chassis battery

Maintenance of the chassis battery, not power for the living space.

05

Lawn and work equipment

A compatible battery in a tractor, mower, or seasonal machine.

06

Remote shed battery

Battery maintenance only. The package is not a shed power system.

Before ordering

Check the battery and where it will be stored.

Supported chemistry

TM522-D supports 12 V lead-acid and 12.8 V or 13.2 V four-cell LiFePO4 batteries.

One battery

Each package is for one supported battery, not a multi-battery bank.

Sun and shade

Panel output changes with orientation, shade, weather, and the season.

Dry, protected controls

Install the controller and connections where they remain dry and protected.

Choose the right model

Send the battery and storage details.

Include voltage, chemistry, capacity, condition, storage time, standby draw, and available sun.

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Common questions

Answers about the TM522-D family.

Can a solar maintainer run lights or a pump?

No. The TM522-D packages are for charging and maintaining one supported battery during storage.

Can TM522-D maintain a lithium battery?

It supports 12.8 V or 13.2 V four-cell LiFePO4 batteries. Confirm that the battery maker permits this charging method.

Is the largest panel always the right choice?

No. Battery capacity and condition, standby draw, storage time, sun, shade, mounting, and cable length all matter.

What comes with a standard package?

The standard packages include the controller, rigid solar panel, permanent battery lead, and battery clips.