Newmar makes nice ones as well On Mar 9, 2016 7:19 PM, "Adam Moffett" <[email protected]> wrote:
> I like the Meanwell AD-155 too. Simple and cheap. > > I read about the Traco TSP on this list (probably from George) and I've > been very happy with it. > > The BCM has a temperature sensor that you tape to the batteries and then > it can automatically adjust the charging voltage according to temperature. > Temperature compensation is an important feature if the enclosure/building > isn't going to stay at 70F all the time, and it will extend your battery > life.....climate control would extend your battery life even better, but > sometimes you take what you can get. > > There are also a bunch of relay closures you can read with a Site Monitor > switch input. You can then be notified about AC power being out and > battery failure. Oh yeah, and there's a relay contact that will power > cycle the whole system. That might come in handy someday. > > I would still use the meanwell (or similar float charger) when it has to > be cheap and the 150W is enough. > > > > On 3/9/2016 3:21 PM, George Skorup wrote: > > The AD-155 is 150W max load. > > What I would do is a Traco TSP 48v power supply (180, 240, 360 or 600W), a > TSP-BCMU360 in 48v mode and a Mean Well 48 to 24 RSD. The BCMU360 takes a > 12v SLA and does an internal DC-DC conversion. I haven't had any problems > with them. I have two in the field right now maintaining 37Ah Deka's. > > On 3/9/2016 2:06 PM, SmarterBroadband wrote: > > That Meanwell sounds right. I will have to see if they make a more > powerful one? > > > > *From:* Af [mailto:[email protected] <[email protected]>] *On > Behalf Of *Mathew Howard > *Sent:* Wednesday, March 09, 2016 11:39 AM > *To:* af > *Subject:* Re: [AFMUG] Small DC Site > > > > Is there really any advantage to using something like an AD-155B with a > UPS function over just connecting the batteries in parallel with the load > to a normal DC power supply and setting the voltage properly? It seems like > there would be less parts to fail and it'd be easier to add redundancy if > the batteries were just connected in parallel. > > > > On Wed, Mar 9, 2016 at 12:52 PM, Chuck McCown <[email protected]> wrote: > > A pair of power supplies that are capable of pulling the load and charging > the battery. > > > > For example, if you needed 200 watts for your 24 volt loads, you need 8.3 > amps. Round that up to 10 amps. > > Then you have to decide how long you want this thing to last without > commercial power. I would think 24 hours is a minimum. So 10 amps x 24 > hours is 240 amp hours of battery. > > It is always a safe figure to charge a battery at .1C or 10% of its > capacity or less. That would be 24 amps to charge the batts after a power > outage, plus 10 for load = 34 amps of power supply. You could get by with > 20 amps, just will take a bit longer to charge. > > > > Lots of 20 amp 28VDC power supplies out there. > > Rule of thumb double your load power or more to size the charger. > > > > *From:* SmarterBroadband <[email protected]> > > *Sent:* Wednesday, March 09, 2016 11:45 AM > > *To:* [email protected] > > *Subject:* [AFMUG] Small DC Site > > > > What are people using to power small DC sites. Option 1 up to 150 - 200 > Watts, option 2 up to 300 – 400 Watts. I’m looking for a DC UPS that can > charge attached batteries. Need to have 24 and 48 volt. > > > > > >
