Energy management system

Solar PV, battery and consumption controlled by weather and prices

fve-EMS reads your inverter through the manufacturer's API, forecasts production and consumption and controls the battery, grid export, EV charger and appliances accordingly. No extra device in your switchboard.

Try 14 days free See the demo

14 days read-only, freeControl only after a signed contractEmergency stop at any time

Demo

A real day of four solar plants — try it yourself

A family house with an EV charger and three business plants. Power flows in 15-minute steps, battery, spot prices and the EMS log, on anonymised data from one November day.

Open the demo

Power flow in any quarter-hour of the day
Charging from the sun, discharging at price peaks
EV charged in cheap hours
A group of plants and the sharing potential

Features

A decision every 15 minutes, not a setting once a season

Production and consumption forecast

Weather several days ahead, production hour by hour. The forecast learns from your plant's real output.

Spot prices every 15 minutes

Czech day-ahead market prices (OTE) for tomorrow. Buy in the cheapest quarter-hours, sell when it pays.

Smart battery

Grid charging only when electricity is cheap, export before the battery is full when it pays, and no export at negative prices.

Battery calibration

Regular full charge in the cheapest hours, respecting the battery type and the maker's recommendations.

EV charger and appliances

The car from surplus, or as cheaply as possible by a set time. Heat pump, water heating and air conditioning by production.

Multiple plants and sharing

Export between sites by your rules, so the energy stays within your sharing group.

Plans

You pay only for what we actually control

A monthly fee per plant, or a yearly payment in advance with a 5% discount. Prices will be published when the portal launches.

Silver — PV

For owners of a PV plant with a battery who want to make the most of spot prices.

Coming soonmonthly per plant

Inverter and battery readings every minute
Weather and production forecast
Spot prices and battery plan
Battery calibration
Overview, alerts, emergency stop

Choose Silver

Gold — household

For a house with an electric car, a heat pump or air conditioning.

Coming soonmonthly per plant

Everything in the Silver plan
2 devices included, e.g. heat pump and air conditioning
Each additional device for a surcharge
Main breaker protection
Load shedding on backup power during a grid outage

Choose Gold

Platinum — companies and multiple plants

For companies and owners of several plants in a sharing group.

Customby project scope

Everything in the Gold plan
Multiple PV plants under one control
Export between sites by your rules
Monthly sharing and price report

Ask about Platinum

Export

Where the energy you do not use should go

The EMS decides when to export. Where the export goes is set by your contracts — choose one of two paths accordingly.

Export to the grid

In the questionnaire, just choose whether you buy electricity at a fixed price or at spot, and how your feed-in is contracted.

The EMS plans battery charging for the cheapest hours
Sells to the grid when the current price makes it worthwhile
Stops export at negative prices

Silver plan

Sharing to other supply points

First you register with the Czech Electricity Data Centre (EDC) and, with an approved sharing-group operator, set the cascade: which supply points the export should flow to, and in what order.

The EMS then releases export so the group consumes it
Schedules export across your plants
Whatever the group does not use goes to the grid

Platinum plan

How it works

From registration to control — you always see where your request is

Registration and questionnaireSite, panels, inverter, battery, contracts. Pick brand and model from the list.
Data reviewWe check the input data and grid connection terms.
API connectionFollowing the guide for your brand, verified by a test reading.
14 days freeRead-only. You see what the EMS would do and how much it would save.
Contract and subscriptionElectronic signature by both parties, payment in advance.
ControlSwitched on step by step, from self-consumption to export.

Safety

Nothing is written to your inverter without your signature

Read-only first

Until both parties sign the contract, the EMS only reads and suggests.

Hard limits

Export limit, main breaker and battery charge range from your grid connection agreement. Nobody can exceed them from the web.

Safe state

If the EMS or the internet goes down, the inverter stays in self-consumption mode.

Your credentials

You enter the API keys yourself; they are stored encrypted and nobody can see them.

Supported brands

Inverters and devices

We connect each plant through its inverter maker's cloud API — nothing to install on your site. We only offer brands whose API supports both reading and control.

Brand	Reading via API	Control via API	Status
Solinteg Hybrid inverters for homes and businesses. Reading and battery control via the maker's Open API — our own EMS runs on them.	yes	yes	in operation
GoodWe A pioneer of three-phase asymmetric inverters on the Czech market. Reading via SEMS+ works; control needs remote-control permission.	yes (SEMS+)	after access approval	pilot
Huawei High efficiency and the FusionSolar ecosystem, usually with LUNA2000 batteries. The Northbound API supports charging, discharging and battery mode.	yes (FusionSolar)	yes (Northbound API)	on request
FoxESS Affordable hybrid inverters. The Open API supports charge and discharge schedules and minimum battery charge.	yes (Open API)	yes (charge schedule)	on request
Victron Energy Top choice for off-grid and backup systems (MultiPlus-II). VRM sets ESS mode and minimum charge.	yes (VRM)	partly (ESS mode)	on request
SMA A long-established German brand (Sunny Boy). Monitoring API for reading, GridControl API for production and operating modes.	yes (Monitoring API)	partly (GridControl)	on request
Enphase Microinverters on each panel (IQ8). API v4 reads production and since 2025 also supports battery mode.	yes (API v4)	partly (battery mode)	on request

EV chargers

go-e Easee Solinteg

Your brand is missing? After registering, choose “My brand is not listed”. We add more brands based on demand.

FAQ

Frequently asked questions

Do I need any new hardware?

No. The EMS talks to the inverter and devices through the makers' cloud APIs; nothing is installed on your site.

Is it worth it if I buy electricity at a fixed price?

Yes, even without a spot tariff. The EMS manages self-consumption, charging the car from surplus, battery calibration and export. A spot tariff adds further savings.

What happens if the EMS goes down?

The inverter stays in self-consumption mode. The EMS only writes the plan for the current day, so nothing is repeated blindly after an outage.

Do I have to change the settings myself?

No. You fill in the questionnaire once and we set up the rest during commissioning. Manual overrides and an emergency stop are available in the portal at any time.

I am an installer. Can I register plants for my customers?

Yes. Choose “Partner” when registering. You fill in the questionnaire for the customer; the customer then signs the contract.

How does the EMS use spot prices?

Every day, once OTE publishes tomorrow's day-ahead prices, the EMS plans in 15-minute steps when to charge the battery, when to discharge it and when to export. During the day it adjusts the plan to actual production and consumption.

How do you forecast my plant's production?

We combine two solar irradiance forecast models and average their results. Every day the model also learns from the actual output of your panels, so the forecast is tuned to your specific plant — including shade from trees, woodland or nearby buildings falling on the panels during the day. The forecast therefore keeps getting closer to reality.