The DC Power Dilemma for Rovers

There are many trade-offs to be considered when it comes to supplying your DC power in a rover.










Ideally, the objectives are:

1. Voltage stability under maximum load current.
• In order to assure linearity of the amplifier RF output. I now run my DC bus at approx. 14.1 VDC (measured at the amplifier terminals under load).
2. Minimum voltage drop in the primary and secondary distribution cables.
• This may require short, higher gage cables and low voltage drop fusing.
3. Capable of handling worse case power duty-cycle.
• Battery capacity (Amp Hours) for transmissions during periods of high run-rates
• Recharge capacity to avoid battery low-voltage drop-out
• High charger and/or voltage booster efficiencies
• Real-time voltage and current monitoring
4. No noticeable RF noise emissions.
• Either radiated or conducted.
5. Safe operating, charging and off-line storage.
• Isolation from main vehicle battery, if connected
• Battery disconnect switch
• Protection from battery tip-over
• Protection from over charging
• Venting of gases from battery charging
• Proper grounding
• Proper fusing
• Proper fire extinguisher type and capacity
6. External Generator Safety (if used).
• Safe fuel storage
• Protection from hot surfaces
• Venting of noxious exhaust gases

After many years of trial and error I've arrived at some recommendations. Check them out and let me know about your experience and solutions. 

Click here for information regarding the Spectrum Control DC feed through EMI filters. I used the high DC current SCI 52-226-006 part number for both input and output connections.

It's also important to use a relatively short, heavy cable for DC power distribution between the voltage stabilizer and the load. I also use ferrite doughnuts to further surpress any conducted RFI.
Note that there's a remote voltage sense capability built into the voltage stabilizer that I haven't tried to use yet. There is also a remote monitor and On/Off interface. You must enable the On/Off control line (with + 12 VDC) to turn the voltage stabilizer On. However, if the voltage stabilizer is cool it won't start until it warms up by drawing current for a period of time. Then it's usually good-to-go for the rest of the day. I don't control the On/Off control line with PTT. Rather I leave it On (connected to + 12 VDC) for day.

The DC Power Stack

For lower current applications a TG Electronics boost regulator provides up to 40 A of regulated voltage at 14.5 VDC (adjustable). A boost regulator, PC Laptop power module and On/Off switch are shown mounted on top of a 12 volt marine battery case.









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