Battery for Growatt MOD-HU and MID-HU - how many modules APX 2.0 choose

Battery for Growatt MOD-HU is a system from 2026 APX HV Battery 2.0 (catalog designation APX 5.0-30.0M-S3): one master module APX 5.0M-B3 plus zero to five battery modules APX 5.0P-B3, from 5 in total kWh to 30 kWh in one column. The same system supports inverters MID 29.9-50K-HU.

What goes with what – and what shouldn't be confused

Battery for Growatt MOD-HU is not the same catalog item as the battery for the older series MID-XH, even though in both cases we are talking about "battery APX"Installation Instructions APX 2.0 lists three families of inverters compatible with the system APX 5.0-30.0M-S3: MOD 3-15KTL3-HU, MID 29.9-50K-HU and single-phase MIN-XH2 in the version with RJ45 port.

Door Line MID TL3-XH - models MID17KTL3-XH, MID20KTL3-XH, MID25KTL3-XH and MID30KTL3-XH - belongs to the previous generation of battery accessories: works with modules APX 5.0P-B1 and requires a separate control module APX 98034-P2This distinction has a direct purchasing effect: the module APX 5.0P-B3 added to the inverter installation MID-XH will not work, because the control is in a separate box and not in the master module.

A shortcut worth remembering: the letter after the dash in the inverter name determines the battery generationThe ending HU means APX 2.0 with master module. The ending XH means APX first generation with separate BMS.

The table above is the shortest answer to the question of which battery to choose Growatt MOD-HU comes into play, and at the same time, a warning against the only truly costly mistake in this family.

What does a battery consist of? Growatt MOD-HU

The system has exactly two types of blocks and one hard selection rule.

Master module APX 5.0M-B3 5 kWh capacity plus all electronics: battery management system, DC disconnect switch, start button, communication port for the inverter, and USB port for software updates. It weighs 51 kg and is the only element without which the system cannot be built. The base is included – the manufacturer ships the master pre-assembled with the base.

Battery module APX 5.0P-B3 the same capacity: 5 kWh in a 45 kg housing, without its own control system. A single master can accommodate between zero and five such modules.

The selection rule is therefore: one master per column, the rest are battery modules. Installation 15 kWh this is one APX 5.0M-B3 and two APX 5.0P-B3, not three identical modules.

Selection matrix: battery for Growatt MOD-HU according to inverter power

The storage power increases with the capacity, 2,5 kW per module, up to the ceiling set by the master electronics: 10 kW in a single-phase installation and 15 kW in a three-phase installation. Because the MOD-HU and MID-HU are three-phase inverters, in practice the right column is what counts.

The dimensions in the table include the base, and the width and depth are constant regardless of configuration: 590 mm and 255 mm. The datasheet adds an important caveat: the overall system's power is limited not only by the battery but also by the maximum charge and discharge power of the inverter. Magazine 30 kWh connected to the inverter MOD 5000TL3-HU it will not give 15 kW, because the limitation is the inverter.

Capacity or power - two criteria that determine the choice

When choosing which battery to use Growatt The MOD-HU is supposed to be installed in an installation, but installers often fall into one trap: they select the capacity based on daily consumption, and then it turns out that in emergency mode the storage cannot handle the load.

If the goal is to transfer energy to the evening , the criterion is consumption after dark plus a reserve for cloudy days. A house without a heat pump and a car charger will rarely use more than two modules above the master. This is an estimate based on our experience, not a value from a catalog card.

If the goal is to sustain a facility during a grid outage , power is key, and this increases only with the number of modules. A master plus one module equals 5 kW, a master plus three modules equals 10 kW. You can't buy "small capacity with high power"—in this architecture, it's all one and the same slider.

Over 30 kWh another column is built with its own master module. The system supports cascading up to three systems APX M-S3 modules, communicating with each other via the CAN bus. Pressing the start button on any master module triggers the entire cascade.

Battery for Growatt MOD-HU from the installer's practice

Three things that are not in any manufacturer's documentation and that change the labor quote.

The latches close without tools, and folding the column is quick and intuitive. This is our observation from the equipment, not a declaration Growatta — modules are connected by contacts, without running cables between them. In the B1 generation, a separate control module and a set of cascade cables had to be purchased for the same installation, meaning three items in the order instead of one.

Weight is a separate issue from difficulty. The battery module weighs 45 kg, the master 51 kg – both positions are two-person, although the module itself is quick to attach. With a full column, 30 kWh We're talking about 278,2 kg, a figure that needs to be verified against the load-bearing capacity of the ceiling or wall before deciding on the installation location. For wall installation, the manufacturer requires confirmation of the wall's load-bearing capacity for the weight of the entire system and recommends floor installation.

The assembly order is counterintuitive. The master goes at the very top of the speaker, not the bottom—even though it arrives factory-assembled with the base. For the first upgrade, the base is unscrewed from the master (three screws) and placed at the bottom.

Before you proceed with your order, it's worth checking four points. First: check the ending of the inverter name, as it determines the battery generation - HU stands for APX 2.0, first-generation XH with a separate controller. Second, calculate the target capacity, not the current capacity, as adding a module after a year is cheap, but replacing a system that's too small is not. Third, confirm whether the storage unit will be floor-standing or wall-mounted—for wall-mounted installation, the wall's load-bearing capacity must be confirmed for the weight of the entire system, which, with a full column, reaches 278,2 kg. Fourth, determine the mounting location relative to the inverter, as the battery must be placed below it or at its air inlet, never at its outlet.

Installation and operating conditions of the battery Growatt MOD-HU

The system has an IP66 protection rating and operates in a temperature range of -20°C to +55°C thanks to the standard heating foil. Despite its tightness rating, outdoor installation requires a roof to protect against direct sunlight and rain.

Service clearances are at least 300 mm from the sides and at least 150 mm in all other directions, and the wall mounting height is between 300 mm and 1500 mm. The battery is mounted below the inverter or at its air intake; mounting near the inverter's air outlet is prohibited as it will reduce the storage capacity.

Two safety notes from the manual that are easy to forget: The manufacturer recommends against installing a DC disconnect switch between the battery and the inverter ; if required by facility regulations, the rated current must exceed 40A, and switching under voltage is prohibited. Before servicing, disconnect the AC circuit breaker, the inverter's DC disconnect switch, and the DC disconnect switch on the master module, and wait two minutes.

Communication with the inverter is via RS485 or CAN bus. With the MIN-XH2 single-phase inverter, the connector socket is sealed with a dust cap, and an N cable extension is not required.

Typical configurations - battery for Growatt MOD-HU in four scenarios

Below are four scenarios that appear most frequently in our quotes. The numbers on the battery side are from the catalog; the assignment to installation size is a selection recommendation, not a manufacturer's parameter.

Single-family house, MOD 3000-6000TL3-HU inverter. The starting point is the master plus one module: 10 kWh and 5 kW of power. The capacity covers typical evening consumption, and the power is roughly equivalent to the capabilities of an inverter of this class, so nothing is wasted. The column is then 690 mm high and weighs 98,2 kg – it fits in most technical rooms without any modifications.

House with heat pump, inverter MOD 8000-10KTL3-HU. A sensible start is a master plus two or three modules, i.e. 15-20 kWh and 7,5-10 kW. The heat pump shifts consumption to nighttime, so the demand for capacity increases, not just power. The column weight then ranges from 143,2 kg to 188,2 kg, and for wall mounting, it's worth comparing this figure with the wall before making a decision.

Small company facility, MOD 12-15KTL3-HU inverter. This is where a full column usually comes in: master plus five modules, 30 kWh and 15 kW. This is also the upper limit of one column - anything above this requires a second master.

Facility with an inverter MID 29.9-50K-HU. The inverter has more power than a single battery column can provide, so the selection goes in a cascade: two or three systems APX M-S3 connected via CAN bus. Each column has its own master module, and each master is a separate order item.

Battery for Growatt MOD-HU - What else do you need to order?

The biggest change from the previous generation concerns the shopping list. APX 2.0 no separate control module is ordered BMS — The battery management system is integrated in the master module. Drivers APX BMS P0 i APX 98034-P2 which we sell for older installations are for APX first generation and do not occur in this architecture.

There's no need to purchase a base separately. The manufacturer ships the master module pre-assembled to the base. The master package includes a 2000 mm system cable, two anti-tilt plates, two M6 expansion anchors, five M4x9 screws, and a set of 1 mm and 2 mm spacers. The battery module is much more modestly packaged: a warranty card and three M4x9 screws.

Three items are purchased separately, and only if the installation requires them: a wall bracket for wall mounting, an N cable extension and a cascade communication cable. APX M-S3. The latter is only needed when connecting two or three systems - with a single column up to 30 kWh does not occur.

Practical consequence for the order: installation 20 kWh to the inverter MOD 10KTL3-HU to exactly two catalog items — one master module and three battery modules. Nothing else, provided it's floor-mounted.

Most frequently asked questions

Is the battery for Growatt MOD-HU also fits the series MID?

Fits the series MID-HU, specifically for models MID 29.9-50K-HU. Does not fit older series MID TL3-XH which works with modules APX 5.0P-B1 and separate control module APX 98034-P2.

How many modules can fit in one battery column? Growatt MOD-HU?

Six: one master module and five battery modules, i.e. from 5 kWh to 30 kWhThe limit applies to both floor and wall mounting.

Is the module APX Will 5.0P-B3 work without master?

No. The battery module does not have its own control system, DC disconnect, or communication with the inverter - these functions are performed by the master module. Each installation must contain exactly one APX 5.0M-B3.

What battery for Growatt Will MOD 10KTL3-HU be suitable?

On the battery side the upper limit is 30 kWh and 15 kW of three-phase power, but the real limitation is the charging and discharging power of the inverter itself. With a 10-kilowatt inverter, adding more than four modules no longer increases the system's power output and only increases the energy reserve.

Can I mix new and older modules?

Data sheet APX HV Battery 2.0 mentions support for mixing new and older battery modules within a single system, but it doesn't specify how far back this compatibility extends. Before expanding an existing installation, it's worth verifying the nameplate markings of the installed modules.

What links does the system have? APX 2.0 and what warranty does it have?

Cobalt-free lithium iron phosphate cells, described in the data sheet as Cobalt Free Lithium Iron Phosphate. The manufacturer's warranty is 10 years, and incl PVGroup.pl the equipment is covered by a European service warranty.

What does the catalog card not provide?

Revision 202607 does not include depth of discharge (DOD), round-trip efficiency, or declared cycle count. If any of these values ​​are a tender criterion, you must request them from the manufacturer—these are copied from the previous generation. APX would be guessing.

Is the battery for Growatt MOD-HU requires a separate module BMS?

No. The battery management system is integrated in the master module. APX 5.0M-B3. Separate drivers APX BMS P0 i APX 98034-P2 belong to the first generation APX and work with MOD-XH BP series inverters and MID-XH.

Is the base included?

Yes, the master module arrives factory-assembled to the base. When adding battery modules, the base is unscrewed from the master and placed on the bottom of the speaker—the master always remains on top.

How high will the column be at 20 kWh?

1220 mm including the base, with a width of 590 mm and a depth of 255 mm. The weight of such a system is 188,2 kg.

Battery for Growatt MOD-HU - selection and purchase

Battery for Growatt MOD-HU is in practice two separate catalog items: master module Growatt APX 5.0M-B3 and battery module Growatt APX 5.0P-B3The full range of magazines can be found in the category energy storageThe manufacturer's source documentation is provided download center Growatt.

Sources

1. Growatt APX 5.0-30.0M-S3 - Datasheet (EN) — catalog card APX 5.0-30.0M-S3 (file on page: rev. 202511 Preliminary; values ​​consistent with the final rev. 202607), p. 2 — specification and configuration table
2. Growatt APX 5.0-30.0M-S3 Quick Start Guide (EN) - installation instructions APX 2.0 - Packing list, assembly conditions, communication