Here are some common questions about Heliomotion

Please browse the questions we have listed below. If you don’t find the answer to your question, or need some extra details, please don’t hesitate to contact us. A PDF version is available for download here.

Heliomotion solar tracker questions

The tracker has an integrated GPS module used to determine the local time, date, latitude and longitude. Using this information the tracker calculates the sun’s position in the sky in order to follow it.

Solar tracking increases energy yield by 30-60% per year, compared with a stationary panel facing south with an ideal tilt. The energy increase depends on the latitude where the installation is located, from +25% at the northern equinox to +60% in Scandinavia. The extra energy is generated in the morning and in the evening which matches the consumption curve of a typical household much more efficiently than a static system which peaks at solar noon – often when everyone is out of the house.

The solar tracker can be powered from any constant 24 VDC power source, either using the included 24 VDC power adapter or by connecting it to a 24 V battery bank. The permitted input voltage range is 10-29 VDC. Average power consumption is 0.4 watt.

The Heliomotion is engineered to withstand high wind loads and even the largest PV-6 system can resist wind speeds up to 30 meters per second – equivalent to 67 miles per hour. Should you expect winds in excess of this, it is recommended that you use the provided extension rod to tilt the panels horizontally. This will protect the installation until the storm passes, as this is the optimum position for the installation to resist high wind loads. PV-6 units in the field have survived wind speeds up to 42 m/s, but we do not recommend installations where wind speeds beyond 30 m/s is common.

In a snowy climate, the foundation column should be at least 1 metre above ground level to prevent the tracker from getting stuck in the snow during winter. As the panels are at a steep angle in the tracker’s morning and evening positions, most snow falls off the unit and there is usually no need to remove the snow manually. As an added safety feature, the tracker will pause tracking if it is unable to move, for example due to excessive snow or vegetation blocking its path. Remove the obstacles and the tracker will automatically resume normal operation within a few hours.

Yes. Keep in mind that in dry regions it may be necessary to wash the panels every couple of months to prevent dust and sand from building up on the panels. In regions with rain, the solar panels are typically self-cleaning and do not require additional attention.

The tracker is designed to work without any reconfiguration. For service purposes the tool Heliocom can be used to communicate with the tracker. Start the tool on a Windows laptop and connect it to the USB terminal on the tracker’s circuit board using a USB cable (Type-A Male to Type-A Male). A description of the tool is available here.

Power plant system questions

The Heliomotion tracker is designed to last for as long as the panels last, typically 25-40 years. We give a 3 year warranty to provide free replacement parts. The warranty appears on the last page of the manual.

The Maysun panels have a 12 year product warranty guarantee on materials and workmanship, and an 80% output guarantee after 25 years.

We recommend the power plant is placed within 100 meters of where the power will be used. The cable size can be adjusted to keep transmission losses low between the power plant and the house. A cable with 2.5mm2 thick wires is suitable for distances up to 40 meters, whereas a cable with 6mm2 thick wires is recommended for longer distances up to 100 meters.

Typically, you want to use a grid-tied system if utility power is available, because it has a lower cost and it allows you to automatically utilize 100% of your produced electricity. The surplus electricity not consumed by your household will be sold to the grid.

Battery-tied system are most often used for off-grid installations when there is no access to utility power. They can also provide backup power during blackouts and allow a greater proportion of generated solar energy to be consumed within the household. When considering a battery-tied system it’s important to keep in mind that generated solar energy that is not consumed will be discarded when the batteries are full. Therefore, to make full use of a battery-tied solar system it should be paired with reoccurring daily loads, such as a heat pump or an electric vehicle.

Since batteries are expensive, storage capacity is an important issue. We offer LiFePO4 lithium batteries by default because of their many benefits compared to lead-acid batteries. In addition to several other advantages, LiFePO4 batteries allow 100% utilization of the capacity without damaging the battery, for which reason one kWh LiFePO4 is usually equated with 2 kWh of GEL lead-acid battery.

For backup purposes and cabins without access to a fixed power grid, we recommend at least 2.5 kWh LiFePO4 battery capacity (2pcs 12.8V x 100Ah battery). This means that with fully charged batteries you can use up to 2500 watts for 1 hour or 1000 watts for 2.5 hours before the capacity is consumed, for example. Larger needs are usually combined with a larger Heliomotion and a larger battery bank. We typically recommend 2.5 kWh for PV-2M/3M, 5 kWh for PV-4M and 10 kWh for PV-6M. This allows storage of about half a day’s solar energy.

We recommend the LiFePO4 batteries. They are extremely durable and can store 5 times more energy during their lifetime than premium GEL lead-acid batteries. Their ability to utilize 100% of the stored energy means that 1 kWh of LiFePO4 is comparable in capacity to 2 kWh of the lead battery. In addition to these benefits when compared to GEL, LiFePO4 weighs 60% less per kWh, has 50% less volume, has significantly higher working efficiency and a slower self-discharge.

The grid-tied microinverters are fanless and make virtually no noise. The battery-tied solar stations have fans which kick in progressively as the inverter load increases, so it should be placed somewhere where the sound doesn’t bother anyone, such as a garage, a shed or a cabinet.

The solar tracker itself is very silent. Listening carefully right next to the tracker, it makes the sound of a distant cicada every 7 minutes or so when it updates its position.

Yes, but we have transitioned to primarily focusing on electrical installations, as demand for them have been considerably larger. If requested, we can provide thermal systems under the model names TC-1000 and TC-2000 (TC for thermal collector).

See the product page for a description of the packages. When you order a Heliomotion you can specify what your package should contain. We manufacture power plants for both grid-tied and battery-tied applications in different sizes. The packages can be ordered with or without panels and inverters.

We advise against installing the Heliomotion on a roof. A free standing unit on the ground is much easier to install and service.

This depends on whether you have a grid-tied or battery-tied inverter. A grid-tied solar inverter feeds power to the grid and so during a blackout the production is halted until power is restored. A battery-tied solar inverter works independently of the grid and so it will continue to supply power to connected loads even during a blackout.

A battery-tied inverter creates its own local power grid which is independent from the utility’s grid. To make use of this power an electrician needs to connect the power output from the inverter either to new power outlets or to existing power outlets through the building’s main fuse box. Keep in mind that the 1-phase VAC generated by a battery-tied inverter is not synchronized to the utility grid and so cannot be used in combination with the utility grid to power any 3-phase loads.

The LiFePO4 battery is extremely durable and has a design life of 20 years. Each charge/discharge cycle reduces the maximum capacity of a battery, more so the deeper the cycle is. After 2000 cycles that are 100% deep, 3000 cycles 75% deep, or 5000 cycles that are 50% deep, a LiFePO4 battery will have lost 20% of its maximum capacity. This is called one service life.

When the capacity has fallen beyond what you are willing to accept, it is time to replace the battery. This is usually after two service life cycles have been consumed. So if the average cycle per day is 75% deep then the battery can be considered exhausted after 6000 cycles or 16.4 years.