Wir verringern die Chargengröße.

Because the subject is wir (we).

The verb verringern is conjugated like this in the present tense:

• ich verringere
• du verringerst
• er/sie/es verringert
• wir verringern
• ihr verringert
• sie/Sie verringern

So Wir verringern ... means We reduce / We are reducing ...

German finite verbs normally come in the second position in a main clause, which is exactly what happens here:

• Wir = subject
• verringern = conjugated verb
• die Chargengröße = object

Die Chargengröße is in the accusative case because it is the direct object of the verb verringern.

You are reducing what?
→ die Chargengröße

The noun Größe is feminine, so its article is die in the nominative singular. In the accusative singular, feminine nouns also still use die.

So:

• nominative: die Chargengröße
• accusative: die Chargengröße

That is why the article does not change here.

Yes, it is one compound noun, which is very common in German.

It is made from:

• Charge = batch / lot
• Größe = size

So Chargengröße literally means batch size.

German often combines nouns into one longer noun where English would use two separate words. Compare:

• batch size → Chargengröße
• car door → Autotür
• company name → Firmenname

The last part of a German compound usually determines the grammatical gender. Since Größe is feminine, Chargengröße is feminine too.

Here, Charge means batch or production lot, especially in manufacturing, logistics, pharmaceuticals, food production, and similar contexts.

Although it looks like the English word charge, it does not usually mean:

• electrical charge
• an accusation
• a fee
• attacking forward

So in this sentence, Chargengröße is specifically something like batch size, not size of a charge in the everyday English sense.

Yes.

German present tense often covers both:

• We reduce the batch size
• We are reducing the batch size

The exact English translation depends on context.

German does have ways to emphasize that something is happening right now, but in ordinary sentences the simple present is often enough.

Because wir is a personal pronoun, not a noun.

In English, you also do not say the we. The same is true in German.

So:

• wir = we
• no article is used

Articles like der, die, das are used with nouns, such as die Chargengröße, not with personal pronouns like wir.

Yes, both are possible in many contexts.

• verringern = to reduce, decrease, lessen
• reduzieren = to reduce

In technical, business, or formal contexts, both can sound natural.
For example:

• Wir verringern die Chargengröße.
• Wir reduzieren die Chargengröße.

Both are understandable and idiomatic.

A slight difference is that verringern can feel a bit more like make smaller / decrease, while reduzieren is often a more direct equivalent of reduce, especially in technical or business language.

A helpful rough guide is:

CHAR-gen-grur-suh

A few details:

• Ch in Charge is pronounced like sh here, because this word comes from French.
• gen sounds roughly like gen in English gentle, but shorter and cleaner.
• ö does not exist in standard English. It is somewhat similar to the vowel in British bird or her, but with rounded lips.
• ß is pronounced like s.

So a more careful approximation is:

SHAR-gen-grur-suh

But the exact vowel in Größe is something you will need to hear and practice.

Because ß is a normal German letter called Eszett or scharfes S.

In modern spelling, ß is often used after a long vowel or diphthong, and ss is used after a short vowel.

Compare:

• Maße = measurements
• Masse = mass / bulk

In Größe, the vowel before ß is long, so the spelling is ß, not ss.

If you cannot type ß, people often write ss, but the correct spelling is Größe.

Yes, but only in certain ways.

The standard order here is:

• Wir verringern die Chargengröße.

You can also move another element to the front for emphasis, but the conjugated verb still stays in second position:

• Die Chargengröße verringern wir.

This sounds more marked or contrastive, something like:

• The batch size, we are reducing.

So the original version is the most neutral and natural in most contexts.

The plural is die Chargengrößen.

So you would have:

• singular: die Chargengröße
• plural: die Chargengrößen

Example:

• Wir verringern die Chargengrößen.
  = We reduce the batch sizes.

Notice that the plural adds -n here.