[RFI] UPS with external batteries
grants2 at pacbell.net
Thu Apr 2 13:54:12 EDT 2020
I built a EMCOMM cabinet for our condo and it includes a HughesNet
satellite link requiring 120vac. The inverter used was
24vdc sine wave inverter 600w samlex PST-600-24a (FCC class B). 600w
capacity in case we needed more 120vac for PC's etc.
We haven't noticed RFI on GMRS, 2m, 70cm and HF. Although we are in a
high noise environment - downtown Settle, 32 floor, roof antennas. My
other experience with Samlex switching power supplies has been good.
Your 5 KWH capacity is quite a battery challenge. We used 4x 6v golf
cart batteries (220 AH x 24v) which will keep the sat modem running
about 24hrs, then a Honda 2kw to recharge. We also use 2x 6v GC
batteries for the 12v radios. Separate 24v and 12v chargers.
Golf cart batteries are the most A-H per dollar. Paralleling batteries
is not a good idea, so either going to a 48v inverter (not sure Samlex
makes one) with GC batteries or 24v with L16's or bigger is needed for 5KWH.
A friend's remote camp uses Outback inverter/chargers but they are 3.5KW
capacity and the battery bank is 8x 6v 500A-H Rolls. No RFI when I
operated VHF & HF there. An important thing to remember is his charging
power is about 4kw and if the load is another 3kw then a 7kw (8kw Kohler
propane installed) generator is needed.
On 4/1/2020 21:53, Gary Johnson wrote:
> I'm looking for recommendations on a low-RFI UPS that supports external batteries for extended runtime. It does not have to provide a lot of power, a couple hundred Watts max would be sufficient. But needs to run for more than a day, say >5 kWH. So that’s a pretty good rack of batteries, but do-able. RFI is the thing. I have yet to find a commercial UPS that has a Part 15 Class B cert. Lots are Class A... Either way, I'd like to hear from anyone who has direct experience.
> -Gary NA6O
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