Next time I need a power supply I am buying a deep cycle battery and a charger/maintainer.
Just understand that a Battery Charger/Maintainer my NOT be what you really want, if Radios, and Electronics, are the expected Loads.
Depends on the Design of that Charger/Maintainer. If the design, first and foremost is a Linear Regulated Power Supply, that then feeds
a typical Three State Charger, then fine, no issues. HOWEVER, if the design uses just a Filtered Rectifier to feed the Three State Charger,
then you will very likely be introducing a considerable amount of HUM, and Noise on the DC Inputs to your Radios, and Electronics. I have
used a Numar 35 Amp Regulated Power Supply, set up with the DC Output Voltage Regulated at 13.4 Vdc, to charge a Pair of L16HD Batteries
in Series, for 20 years. This powers the Shacks 12Vdc Buss that run a whole slew of Radios, Computers and associated Electronics. Back in the
Day, when I was designing this System, I first used a Raytelco Constant Volt Charger, and found that I had significant Noise, and Hum, especially when the Battery was at less than Float Voltage. Looked at the Buss with my Textronics Scope, and could see the issue. Then went to the Numar, and have never had the Issue since, with No discernible, Hum or ripple on the DC Buss, even when pulling 25 Amps when Transmitting on VHF FM at the 140 Watt Level. Just Say'en..... YMMV....