Using two of these; one to control the solar panel charging rate from the charge controller to the battery, the other to control our use of the 12v battery. Both ammeters are installed in our camper next to the solar charge controller. A small downside, they have to be at eye level to be readable. Mine are at knee height so I tilted them (see photo). So they are readable. For me, that's not the main thing, so I still rate it highly and recommend it to others.
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