Example report: Home battery — Marstek Venus E (10 kWh)

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Key finding: in QuoteChecker's independent review, this Home battery — Marstek Venus E (10 kWh) quote scored 5.8/10, with 1 risk and 3 points of attention identified; our recommendation to the client: Negotiate payment and scope first.

QuoteChecker.net — Complete Check report

Home battery — Marstek Venus E (10 kWh)

Example

Client

[Private client]

Provider

[Installation company]

Report

2025

Summary

[Installation company] offers a Marstek Venus E 10 kWh home battery for € 2.490 incl. VAT, a market-conform price for the product alone. However, the quote is incomplete: installation, cabling and warranty provisions are missing, and the requirement of 100% payment in advance poses a financial risk. Have these points recorded in writing before you agree.

4 positive 3 points of attention 1 risk

Average score

⚠️ Our recommendation: Negotiate payment and scope first

The quote from [Installation company] offers a market-conform product at a reasonable price, but the requirement of 100% payment in advance (€ 2.490) is the biggest risk: in the event of non-delivery you are left empty-handed. It is also unclear whether installation and cabling are included — this could cost € 300–600 extra. Before agreeing, have it recorded in writing that installation is included, that the warranty amounts to at least a 10-year product warranty, and that payment is split 50/50.

Cost overview

Item	Amount
Marstek Venus E V3 10kWh Plug-in Home Battery (1 unit)	€ 2.057,85
Subtotal excl. VAT	€ 2.057,85
VAT 21%	€ 432,15
Total incl. VAT	€ 2.490,00
Total quote amount (indicative)	€ 2.490

Category scores

Price transparency

Quote completeness

Provider reputation

Red flags

Technical specification

Hidden costs risk

Warranty & subsidy

Price market conformity

Contractual risk

Scope completeness

Findings

Price including VAT clear

The quote clearly states € 2.057,85 excl. VAT and € 2.490,00 incl. VAT (21%). No surprises in the VAT calculation.

Provider details complete

Chamber of Commerce (KvK) [KVK], VAT [VAT], IBAN [IBAN] and contact details are all present and verifiable.

Good Google reputation

[Installation company] has a rating of 4.6/5 based on 205 reviews — a solid review base.

Quote expiry date stated

The quote has an expiry date of 16-12-2025, so you know how long the price is valid.

Installation not mentioned

The quote specifies only the product (Marstek Venus E). Whether mounting, cabling and commissioning are included is not stated. This may later be invoiced as additional work (estimate: € 300–600).

No warranty provisions

No warranty period on the product or the installation is mentioned. The Marstek Venus E typically carries a 10-year manufacturer's warranty — have it recorded whether [Installation company] passes this on and whether there is a warranty on labour.

No general terms and conditions attached

No reference is made to general terms and conditions. This means liability, the returns policy and dispute resolution are not laid down. Request these before signing.

100% payment in advance required

The payment condition is 'payment in advance', meaning you pay the full amount of € 2.490 before delivery. In the event of non-delivery or bankruptcy you have no recourse without legal action. Negotiate a maximum of 50% up front and 50% on delivery.

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