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The PR series are simple two stage regulators for charging
lead acid or gel batteries from photovoltaic panels. The full available
charge current is allowed to flow into the battery until the battery
voltage rises to the boost maximum. The battery now being fully charged,
the unit switches to the float mode. The current is switched off and the
battery voltage slowly falls. When it drops below the float cut in, the
current is switched on again.
It stays on until the voltage rises to the float maximum
and is then turned off. The battery voltage will slowly oscillate between
the float maximum and cut in. When the battery has been discharged enough
for it to fall below the boost cut in, the unit will switch back into the
boost mode. The PR series use a rugged power
mosfet and switches on the
negative side. Solar positive connects either direct to the battery
positive terminal or to the bat+ on the regulator.
The unit does not contain a reverse blocking diode. |
| |
PR1210 |
PR1210L |
| Boost maximum |
14.7
volt |
14.25
volt |
| Boost cut in |
12.5
volt |
12.5
volt |
| Float maximum |
14.1
volt |
14.1
volt |
| Float cut in |
13.1
volt |
13.1
volt |
| Charge current |
10 amp |
10 amp |
| Supply current |
4mA |
4mA |
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Panel requirements for battery backup
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To effectively charge a deep cycle battery for 24 hour a
day running the panel size needs to be three times larger that the wattage
draw of the pump for summer use and five times larger for winter use.
Example: A Oase Aquasolar 700 pump draws 8 watts,
the recommended panel is a Uni solar 11 watt
Therefore the ideal summer / winter panel with battery backup would need
about a 21watt panel or larger. How it works: The
pump runs off the battery provided there is enough power. The panel
charges the battery during direct sunlight hours allowing the pump to draw
down the battery during the evening and overcast days. It is up to you how
large the battery should be, in the case of the Oase Aquasolar 700 which
draws 8 watts, the batter must be at least powerful enough to replace that
draw during the day and at the same time give the battery enough charge to
replace the draw from the night before. |
