Abstract: The gap between "I need 10kWh" and an approved, installable home battery design is rarely about price — it is about whether the RFQ includes three critical inputs: actual household load, existing inverter model, and grid connection type. This article walks through the five-step workflow from RFQ to BOM using real configurations shipped by Ruibit Energy.
To get an approved home battery design in one round, send five things: monthly electricity bill, existing inverter brand and model, grid type (single/three/split-phase), backup requirement, and budget range. With these, Ruibit Energy — as an authorized distributor of Dawnice residential storage — can return a concrete BOM in 2–3 working days: for example, 2 × HZEB-LCT-10 + DWH 10–16K for a 12 kWh/day European home, instead of a vague "10kWh — price on request."
Step 1: Lock the Grid — This Picks the Inverter
The inverter is decided before battery sizing. Get this wrong and nothing connects on install day.
| Grid Type | Region | Inverter We Spec |
|---|---|---|
| Single-phase 230V | Southern Europe, Africa | DWH 10–16K (10–16kW) |
| Three-phase 400V | Germany, Australia, large homes | DWH 8–24K (8–24kW, triple MPPT) |
| Split-phase 120/240V | USA, Canada | DWH 8–15K (UL certified) |
| Off-grid, no utility | Remote farms | DWA (3–10kW off-grid) |
This is why our USA 100kWh residential case ran the DWH 8–15K from day one — the house wiring dictated split-phase before anyone talked battery capacity. Sending a single-phase unit to a 120/240V home means a two-week delay and air-freight return.
Step 2: Get the Real Load — This Picks the Battery
A monthly bill beats any estimate. Daily kWh × autonomy days = total energy needed.
| Household Profile | Daily Use | Battery We Spec |
|---|---|---|
| Apartment, essential backup only | 3–5 kWh | HZEB-LCT-5 (5kWh) |
| Average 4-person home | 8–12 kWh | HZEB-LCT-10 (10kWh) |
| High-demand (heat pump + EV) | 15–20 kWh | HZEB-LCT-16 / -20 (16–20kWh) |
| Large home / off-grid | 20–80 kWh | BS06-S stack (15–46kWh) or HZEB-LCT-10ESS (30.72kWh) |
Worked example: 4-person home, 12 kWh/day, 2-day autonomy → 20–25kWh usable → two HZEB-LCT-10 units in parallel. Our Romania 75kWh wall-mounted system was spec'd this way — the rural load curve (well pump + heating + workshop) drove the number, not a marketing figure.
Step 3: Match the Existing Inverter
If rooftop solar already exists, the current inverter decides the architecture:
- Hybrid inverter (Deye, Sunsynk, Growatt): battery-only BOM — match voltage and CAN/RS485 protocol. Our UK 30kWh case ran on this: Dawnice battery + Sunsynk hybrid, no inverter replacement.
- Standard solar inverter (no battery port): needs AC-coupled upgrade or full replacement.
- Old or unknown brand: replace with a DWH series hybrid.
If you want a pre-matched package instead of building component-by-component: 6kW/10kWh for new installs, 10kW/20kWh for medium homes, LumiSun-32K 32.14kWh for three-phase large homes, or Home Stackable 20–80kWh for expandable systems.
Step 4: What the Approved Design Looks Like
It should fit on one page, every component carrying a model number:
2 × HZEB-LCT-10 + 1 × DWH 10–16K + backup box + CT clamp — single-phase 230V, sized for 12 kWh/day load, 2-day autonomy.
Plus a single-line diagram and mounting reference. No vague "10kWh system — price on request."
Step 5: Before You Approve
- Does the single-line diagram match your panel layout?
- Does the backup box cover what you actually need (well pump, refrigerator, EV charger — not just lights)?
- Is the battery location (garage, utility room, outdoor wall) compatible with the IP rating?
The buyers who skip steps 1–3 and just ask "best price for 10kWh" get a catalog quote — then spend three weeks fixing it on site. Send the grid type, inverter brand, and load data to Ruibit Energy upfront, and the conversation moves from "how much" to "which model."
Frequently Asked Questions
Q1: How long does it take to get an approved battery design after sending the RFQ?
With all five inputs (bill, inverter model, grid type, backup needs, budget), Ruibit Energy returns a model-numbered BOM and single-line diagram within 2–3 working days. Missing information adds rounds of back-and-forth.
Q2: Can I buy just a battery if I already have a hybrid inverter?
Yes. If your existing inverter (Deye, Sunsynk, Growatt, etc.) already has a battery port and supports CAN/RS485 communication, you only need to match voltage range and protocol. Our UK 30kWh case ran this way — battery only, no inverter replacement.
Q3: What's the difference between single-phase and split-phase inverters?
Single-phase (230V, Europe/Africa) and split-phase (120/240V, North America) are not interchangeable. Split-phase homes need a dedicated unit like the DWH 8–15K (UL certified). Ordering the wrong one means the system won't connect on install day.
Q4: How much battery capacity does a typical home need?
It depends on daily use, not marketing numbers. A 4-person home at 12 kWh/day with 2-day autonomy needs 20–25 kWh usable — typically two HZEB-LCT-10 units. Apartments doing essential-load backup only need 5 kWh.
Q5: Do you offer pre-matched all-in-one packages?
Yes. The 6kW/10kWh and 10kW/20kWh all-in-one units pair inverter and battery from the factory. For larger homes, the LumiSun-32K three-phase system or Home Stackable 20–80kWh modular system work without component-by-component matching.
