solar chargers


A Primer on Solar Charge Controls

A primer on solar charge controls A brief search on eBay turned up some 4700 listings for solar charge controls. Prices on 12 /24V units range from about 7 to $250. With all the specifications and buzzwords that are thrown around, many are understandably confused. This discussion should be helpful in making the best selection. […]


Series Commutated SCR SSS Solar Charge Control

A series commutated SCR makes a very unusual Solid State Switch in this solar charge regulator control. Advantages include simplicity and robustness. The SCR performs (3) functions: switch, latch and reverse polarity diode (reverse blocking thyristor). The SCR conducts the charging current from the solar panel to the battery while a series MOSFET performs the […]


6V Solid State Switch Solar Charge Control

This is a Solid State Switch upgrade to the 6A, 6V Relay Based Solar Charge Regulator. Solid state switching provides longer life, smaller size and higher efficiency than a relay. In addition, the clock frequency may be doubled in order to better track battery load /charging requirements. The parts cost is essentially identical. One drawback […]


12V Solid State Switch Solar Charge Control

This is a Solid State Switch upgrade to the 6A, 12V solar charge regulator. Solid state switching provides longer life, smaller size and higher efficiency than a relay. In addition, the clock frequency may be doubled in order to better track battery load /charging requirements. The parts cost is only slightly higher. One drawback is […]


SCR Based SSS Solar Charge Control

A force-commutated SCR makes a novel Solid State Switch in a solar charge regulator control. Prior art includes relay and transistor switches, but an SCR switch in this type of DC application may be new to the world (normally SCRs are applied in line-commutated AC applications). Advantages include robustness and the requirement of only one […]


6V Solar Charge Shunt Regulator

A shunt regulator technique may be effectively employed in regulating the charging voltage of a lead-acid battery. Although it has a practical power limitation (< 20W or so), it has the notable advantage of being an LDO (low dropout) regulator (zero voltage dropout in this case) - this is in contrast with the typical series […]