Yes, I've got many. I've got a bunch of tractors sitting up in northern Michigan along with a Ford diesel truck. Many batteries that spend most of the year doing nothing. I bought some pricey Shumacher 1.5 amp battery trickle chargers that are high frequency. Around $40 each and work great. I have one hooked to four batteries in parallel, and the other for two in parallel.
Afterwards, Harbor Freight starting selling no-name equivalents for $14 each which is amazing. I've got half a dozen and they work great. 1.5 amp, high frequency and with permanent mounting brackets if you want them attached to a tractor, car, or truck. They work every bit as good as the Schumachers - and for all I know, they may come from the same Chinese factory.
My mini-motor home is a Chevy K5 4WD diesel with six batteries and I don't drive it in the winter. I've got three of those tenders hooked to it. One tender per each set of two large batteries. Two starting batteries and four large deep-cycle batteries with over 500 amphours. They run the on-board 6000 watts worth of inverters.
I did find that a 1.5 amp tender cannot work on four big batteries. It stays on all the time. They work by charging to 14.8 VDC, then turning off, and then coming back on when battery volts drop below 13.5 VDC. Problem is . . . with a large bank over 200-300 amp hours, and even new batteries - 1.5 amps can't get them above the 14.8 VDC threshold.
One warning - those high frequencies do a number on any AM radio that's withing 300 feet. But, only wheh the chargers are actually charging.
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