New in version 3.7.1
Two inverters stay ready, one to charge, the other to discharge. The smallest solar surplus is stored, the smallest demand covered, without starting or stopping an inverter with every cloud. The others stay on standby until they are needed: your inverters and batteries are under less strain, for a longer service life*.
A sunny spring day simulated with TED's real control code, 4 batteries (14.4 kWh). Method at the bottom of the page.
24 hours, 4 batteries
Same home, same batteries, same sun. Watch the inverters on standby while others work, charging that follows the sun smoothly, and the meter staying as close to zero as possible. Each line of the "barcode" is a start, a stop or a reversal.
Solar Home Meter · Simple split Meter · optimised charging
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All inverters take an equal share, in the direction of the meter.
Two inverters always ready, the others on standby until they are needed.
start stop charge / discharge reversal Charging Discharging Ready to charge / ready to discharge Standby
| Simple split | Threshold charging | TED, optimised charging | |
|---|---|---|---|
| Starts, stops and reversals (4 inverters) | 1,226 | 603 | 285 (best value) |
| Total running hours of the inverters | 78 h | 39 h (best value) | 49 h |
| Energy in the batteries at sunset | 12.8 kWh (best value) | 11.2 kWh | 12.8 kWh (best value) |
| Solar surplus sent to the grid | 0.7 kWh (best value) | 2.2 kWh | 0.8 kWh |
| Average meter deviation from zero | 48 W (best value) | 110 W | 54 W |
How it works
The emptiest battery stays ready to charge, the fullest ready to discharge, each at 50 W. A surplus goes to the first, a demand to the second, from the next meter reading. If more power is needed, another inverter leaves standby and gradually takes its share.
What you gain
Threshold charging waits for 200 W of surplus before starting, then keeps that threshold: that surplus goes to the grid. With optimised charging, your batteries hold 1.6 kWh more at sunset, ready for the evening.
A cloud, a kettle: the inverter already running responds at once, in either direction. The meter stays on average 54 W from zero, versus 110 W with threshold charging.
At night, a single inverter covers the home instead of four at low power. The others join one by one when more power is needed, and hand over smoothly. Result: 4.3 times fewer starts, stops and reversals, and 38% fewer running hours than with a simple split.
Fewer starts, stops and switches from charging to discharging, power that changes gradually, batteries that work in turn according to their level: a control designed to spare your inverters and your batteries.
* Design goal: less strain on inverters and batteries. The effect on their service life has not been proven by an official laboratory.
Good to know
A sunny spring day (sunrise at 7 am, sunset at 8 pm), simulated with TED's real control code and its default settings. Simulated inverters: 4 batteries from 1.9 to 5.8 kWh (14.4 kWh in total), two of them with 800 Wp of panels, plus 1.2 kWp of micro-inverters. A home using about 9 kWh a day, with kettle, oven, hob, washing machine and dishwasher.
Simple split: all available inverters take an equal share, in the direction of the meter, without delays (what a basic control would do, not a specific product). Threshold charging: TED's classic charging, which starts after 200 W of surplus for 20 s.
Indicative results: every installation is different. These figures will be complemented by measurements on real installations.
Free download. Optimised charging is enabled in the Settings as soon as two inverters are controlled.