Very Inexpensive Battery Maintenance Charger
1.0 ampere output. 13.8 volts regulated charge limit. This unit is good for 100 amp hours worth of batteries. IMO the voltage is a tad high for a high antimony RV battery with temps 60F or higher but ...
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When things get tough I'm planning on taking this one down to 30% SOC providing I can recharge it fully, within a day or so. Where these critters shine is in high amp draw situations, like a pair of 31's dedicated to operating an 1,100 watt microwave via a PSW inverter.
