Deep discharge protection.
A deep discharge protection automatically disconnects loads from the onboard battery before the voltage drops so far that the battery is permanently damaged. philippi offers the two-channel TSD 40 with acoustic pre-alarm and 2 × 40 A, and the remote-controllable THR 265 with 260 A, each for 12 and 24 V. Reconnection takes place automatically at 12.5 or 25 V.
Deep discharge protection with pre-warning
The dangerous deep discharge of (lead) batteries
If a battery is fully discharged and then further discharged (deep discharge), so-called lead sulfation (loss of internal surface area) of the negative electrode occurs, resulting in irreversible capacity loss. In addition, lead sulfate crystals grow (sulfation), which also reduce the usable capacity. The risk of micro-short circuits, which increase the self-discharge of the battery, also increases. Therefore, deep discharge should be avoided at all costs to prevent premature battery failure. Deep discharge protection protects batteries from harmful deep discharge by switching off consumers when the lower voltage limit is reached. Re-activation occurs automatically when the batteries are recharged.
Frequently asked questions. Answered briefly.
Why do I need deep discharge protection?
Deep discharge protection automatically disconnects the house battery from the onboard system as soon as its voltage falls below an adjustable limit. This prevents standby loads and self-discharge from draining the battery so far that it permanently loses capacity. With lithium batteries, this task is usually handled by the built-in BMS.
What is the advantage of two-channel deep discharge protection?
The TSD 40 two-channel deep discharge protection switches off loads in two stages instead of all at once. It first disconnects comfort loads, while safety-relevant loads stay active longer. An acoustic pre-alarm warns before disconnection. Each channel switches up to 40 A, and reconnection takes place automatically at 12.5 V or 25 V.
How do I protect the entire onboard system or an inverter?
The remote-controlled THR 265 power deep discharge protection switches off the complete onboard system or the DC input of an inverter with 260 A. It disconnects at 11.2 V or 22.4 V after 300 seconds and reconnects at 12.5 V or 25 V. For the FBR 500 battery main switch, the TSR control interface takes on this task.
Which control panel suits my deep discharge protection?
The FAR panel remotely controls the TSA 265, FBR 265 and TSR and, according to the product page, also the THR 265. For the TSD 12/40 deep discharge protection, the FB-TSD control panel is intended: it shows the switching state via LED and flashes to warn of an imminent disconnection.