gate boost solar engine

12 Volt 20 Amp Solar Charge Controller

The SCC3 is a solar charge controller, it`s function is to regulate the power flowing from a photovoltaic panel into a rechargeable battery. It features easy setup with one potentiometer for the float voltage adjustment, an equalize function for periodic overcharging, and automatic temperature...

SmartCap solar engine

Here`s a circuit diagram (originally drawn by Wilf Rigter, I corrected it based on Bob`s on-list feedback) for Bob`s "Vore-N-More" circuit containing the SmartCap solar engine: In this diagram, the "SmartCap" is just the 1.5 F storage capacitor, phototransistor, 2N3906 transistor, and 5.1K...

Photovoltaic By-Pass Diodes

To produce a reasonably high output voltage, photovoltaic cells are often connected in a series configuration. If a portion of the series becomes shaded, then the output of the remaining active cells is applied to the inactive cells, as shown in figure 1. Note that the normal current flow in...

12 Volt Toilet Tank Refiller

A flushing toilet is something that most city dwellers take for granted, but it can be a luxury for those who live far away from utility water and electricity. This circuit controls a small 12 Volt pump that is used to fill a toilet tank from an external rainwater collection cistern. Automotive...

6 Amp Solar Power Center

The SPC2 is a solar power center, it can be used to handle all of the power functions for small 12 Volt solar powered devices. It contains a photovoltaic charge controller and a low voltage load disconnect circuit. The low voltage disconnect has a load on-off switch, and a battery low voltage...

Vx2SE solar engine

The Vx2SE is a simple discrete voltage-doubling SE for driving an LED. If the load is a red or green LED, J1 is used together with just one red or green LED for threshold detection (no 1381). For driving a blue LED use two green or red LEDs in series and may require a higher voltage (3V) solar...

Solar cell battery charger circuit

The circuit charges a 9-V battery at about 30 mA per input ampere at 0.4 V. Ul, a quad Schmitt trigger, operate as an astable multivibrator to drive push-pull TMOS devices Ql and Q2. Power for Ul is derived from the 9-V battery via D4; power for Ql and Q2 is supplied by the solar cell. The...

Low-loss circuit powers solar lantern

The solar-lantern circuit in Figure 1 is a low-loss configuration that uses a 7W, four-pin CFL (compact fluorescent lamp) and a 12V, 7-Ahr, sealed, maintenance-free battery. The inverter features greater-than-85% efficiency, less-than-2-mA quiescent current, and a shunt-charge controller with...