The Progressive Dynamics that I recommended to Clarke is a higher output charger than the Xantrex TrueCharge units. You likely have a 75 amp charger currently. I have a 75 amp Magne-Tek as original equipment. Xantrex recommends a 40 amp charger if you have more than 200 amp-hours of batteries (this assumes 12 volt batteries, if you are using 6-6volt batteries of 120 amp-hrs each that would be 360 amp-hrs at 12 volts) or a 20 amp charger if you have between 100 and 200 amp-hrs. A larger charger recharges your batteries faster. My ProSine 2KW has a 105 amp 3-stage charger built in.
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