A home battery site survey isn't a 10-minute walkthrough — missing one item means the wrong battery, a non-commissionable inverter, or a rework truck roll. Before you quote or install any residential ESS, verify four things on site: grid connection type and capacity, actual household load, the existing inverter's compatibility, and the physical mounting location. Skip any one and the system spec from the office won't match the wall you're standing in front of.
1. Grid Connection: Phase, Voltage, and Available Capacity
This is the first thing to check on site, and it determines the entire inverter selection. Open the consumer unit and look at the main breaker.
- Single-phase homes (230V, 50Hz): standard across most of Southern Europe, Africa, and parts of Asia. Pairs with the DWH 10–16K single-phase hybrid (10–16kW).
- Three-phase homes (400V): common in Germany, Australia, and large properties. Needs the DWH 8–24K three-phase unit with triple MPPT.
- Split-phase 120/240V: North American standard. The DWH 8–15K is UL-certified specifically for this — a single-phase unit will not energize both legs.
- Off-grid properties: no utility connection at all — spec the DWA off-grid inverter instead of a hybrid.
Also check the main breaker rating and the grid operator's export limit. A 50A main breaker doesn't support a 16kW inverter on a single-phase connection even if the inverter itself can do it. Our USA 100kWh residential case required checking the service entrance capacity before the DWH 8–15K was approved — the panel upgrade scope changed the project budget by 15%.
2. Household Load: What Actually Runs During an Outage
Don't ask the homeowner "how much power do you need." Look at their last 12 months of bills and walk through the house.
- List every load they want backed up: refrigerator, well pump, EV charger, heat pump, oven, lights, Wi-Fi.
- Add up the running watts and startup (LRA) watts — a well pump or AC compressor draws 3–5× its running power on startup.
- Check daily kWh usage from the bill. A home using 12 kWh/day with 2-day autonomy needs 20–25 kWh usable — that's two HZEB-LCT-10 units, not one HZEB-LCT-5.
The Romania 75kWh wall-mounted install came from this exercise: the homeowner said "we need backup," but walking the house revealed a well pump, electric baseboard heating, and a woodworking workshop. The spec went from 15kWh to 75kWh before we left the driveway.
3. Existing Inverter and Compatibility
If the roof already has solar, take photos of the inverter nameplate. Write down the exact brand, model, and firmware version if accessible.
- Hybrid inverter with battery port (Deye, Sunsynk, Growatt, Solis): you only need the battery. Confirm the battery voltage range matches and the CAN/RS485 protocol is supported. Our UK 30kWh case paired a Dawnice battery with an existing Sunsynk hybrid on-site — no inverter swap needed.
- Standard solar inverter with no battery port: options are an AC-coupled battery inverter or full hybrid replacement. This adds 30–50% to the BOM.
- Old or unknown inverter: plan for a full replacement. The DWH series hybrid is the default path.
Also check: does the existing solar array have enough string voltage for the new hybrid? A 10-year-old 3kW array may not hit the MPPT low-voltage threshold of a modern 10kW inverter.
4. Mounting Location and Physical Conditions
Wall-mounted batteries like the HZEB-LCT series weigh 55–90 kg per unit. The wall has to carry that load, and the location has to meet IP rating requirements.
- Interior garage or utility room: ideal for wall-mounted units. Check wall material — drywall over studs needs reinforced backing; masonry is fine.
- Outdoor installation: requires an IP54+ rated cabinet or a weatherproof enclosure. The HZEB-LCT series is rated for indoor/dry locations; outdoor stackable cabinets exist for exposed sites.
- Clearance: leave 50 cm above and below for cable access and service. Don't mount behind a door swing or where a water heater pipe could leak.
- Temperature: below 0°C or above 40°C degrades battery life. Unheated garages in cold climates need a thermal enclosure.
- Path of installation: measure the stairwell and door width. A 90 kg wall-mounted unit that can't get up the stairs becomes a crane job.
5. Backup Panel and Critical Loads
On site, identify which circuits go to the backup box. Don't rely on the homeowner's memory — trace the panel.
- Label the essential-load circuits: fridge, freezer, lights, router, well pump controller.
- Make sure the backup box rating matches the inverter's continuous output.
- If the homeowner wants whole-home backup, confirm the inverter kW rating can handle the simultaneous startup load — not just the running sum.
A site survey done in 20 minutes saves a 3-hour rework on commissioning day. The installers who walk out with photos of the panel, the inverter nameplate, the mounting wall, and a signed load list are the ones whose systems go live on the first visit. The ones who skip step 3 or step 4 come back with the wrong battery on the truck.
Bring this checklist to your next site visit — and if you're not sure which Dawnice model matches what you found, send the photos to Ruibit Energy before you quote.
Frequently Asked Questions
Q1: How long does a home battery site survey take?
A thorough survey — panel check, load walkthrough, inverter inspection, and mounting location photos — takes 45 to 60 minutes. Rushing it in under 20 minutes usually means a rework visit later.
Q2: What if the homeowner already has a solar inverter but it's not a hybrid?
Two options: add an AC-coupled battery inverter, or replace the existing unit with a DWH series hybrid. The choice depends on the inverter's age, string voltage, and budget — send the nameplate photo to us and we'll tell you which path is cheaper.
Q3: Can wall-mounted batteries be installed outdoors?
The HZEB-LCT series is rated for indoor/dry locations. Outdoor installations need a weatherproof cabinet or an IP54+ rated enclosure. Extreme cold (below 0°C) also requires a thermal wrap or insulated cabinet to protect cycle life.
Q4: How do I know the main breaker can handle the inverter?
Check the main breaker rating on site. A typical 10kW single-phase inverter needs a minimum 50A main breaker on a 230V supply. If the panel is undersized, the grid operator may require an upgrade before commissioning.
Q5: What if the load survey shows more than 20kWh?
Move up from wall-mounted to stackable. The BS06-S high-voltage series scales from 15.36kWh to 46.08kWh, or the HZEB-LCT-10ESS low-voltage stack reaches 30.72kWh. For homes over 80kWh, the Home Stackable modular system is the right path.
