Does “off-grid” mean there is no utility input?
Do not infer that from the category name. An inverter/charger can be described as off-grid while also accepting an AC source. The useful question is what the exact model does with that input and how it supplies the selected loads.
Utility input and documented grid-tie operation are different checks. A mention of mains charging, bypass or multiple energy sources does not by itself establish grid-export capability. Ask for the model’s operating-mode documentation rather than treating the word “hybrid” as a complete specification.
Do you need power at a site without a grid connection, storage to use at a later time, or backup for selected equipment when supply is unavailable? Describe those requirements separately. If interaction with the grid is part of the brief, ask the qualified project designer to confirm the equipment and local connection requirements.
Read the published functions alongside the series name.
These two Toyama catalog families illustrate why a watt rating alone cannot select the operating role. They are examples to investigate, not interchangeable replacements or a verified system package.
| Published detail | PV1800 VPM II | PH1100 PRO |
|---|---|---|
| Family description | Off-grid solar inverter/charger | Hybrid solar inverter |
| Described functions | Inverter, MPPT solar charger and battery charger; solar, utility and battery supply | Grid-tie, off-grid and storage modes |
| Series power range | 1,000–5,500 W | 3,600–6,000 W |
The PV1800 VPM II page describes utility as an energy source within an off-grid family. The PH1100 PRO page explicitly describes grid-tie and off-grid modes. That distinction is useful when forming your questions; neither description proves connection approval or the backup result at your site.
Primary references: PV1800 VPM II manufacturer page and PH1100 PRO manufacturer page. The ranges span multiple models. Confirm the exact model code, current datasheet and supported modes.
Keep storage, grid interaction and outage behaviour separate.
Stored energy for later use and backup during an outage are different objectives. Victron’s ESS overview distinguishes self-consumption and keeping storage available for backup, and treats feed-in as an optional system function. Those examples explain the distinction; their settings and performance do not transfer to Toyama products.
Concept reference: Victron ESS introduction and features. It describes that manufacturer’s particular architecture.
For backup, specify the equipment that should remain powered, simultaneous and starting loads, required duration and tolerated interruption. Ask which outputs support the intended mode and what battery, transfer and other system requirements apply. A hybrid label or a battery connection is not a guarantee that every circuit will remain powered.
Review battery energy and inverter compatibility for the storage checks, and inverter heat and placement for the environment brief. Those questions remain relevant whichever operating role you need.
What should you send with an inverter enquiry?
- Available supply: no grid, utility or another AC source; include known phase and voltage.
- The intended role: independent power, storage, grid interaction, backup, or a combination requiring review.
- Load list, simultaneous demand, starting demand and operating hours.
- Selected backup loads, desired duration and interruption tolerance.
- Existing panel, inverter and battery model details, plus the candidate model code.
- Site environment and any project connection constraints already identified by your designer.
Use the off-grid project brief or the solar and storage project brief to organize the information. If the operating role is uncertain, include that question rather than choosing a category from wattage alone.
This is equipment selection guidance. It does not provide wiring instructions, an approved electrical design, availability confirmation or grid-connection approval.
Explore off-grid solar inverters →Also compare hybrid inverter families and their exact published specifications.